891 lines
33 KiB
C
891 lines
33 KiB
C
/*
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* @brief LPC15xx I2C driver
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*
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* @note
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* Copyright(C) NXP Semiconductors, 2014
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* All rights reserved.
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*
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* @par
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* Software that is described herein is for illustrative purposes only
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* which provides customers with programming information regarding the
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* LPC products. This software is supplied "AS IS" without any warranties of
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* any kind, and NXP Semiconductors and its licensor disclaim any and
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* all warranties, express or implied, including all implied warranties of
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* merchantability, fitness for a particular purpose and non-infringement of
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* intellectual property rights. NXP Semiconductors assumes no responsibility
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* or liability for the use of the software, conveys no license or rights under any
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* patent, copyright, mask work right, or any other intellectual property rights in
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* or to any products. NXP Semiconductors reserves the right to make changes
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* in the software without notification. NXP Semiconductors also makes no
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* representation or warranty that such application will be suitable for the
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* specified use without further testing or modification.
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*
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* @par
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* Permission to use, copy, modify, and distribute this software and its
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* documentation is hereby granted, under NXP Semiconductors' and its
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* licensor's relevant copyrights in the software, without fee, provided that it
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* is used in conjunction with NXP Semiconductors microcontrollers. This
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* copyright, permission, and disclaimer notice must appear in all copies of
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* this code.
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*/
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#ifndef __I2C_COMMON_8XX_H_
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#define __I2C_COMMON_8XX_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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/** @defgroup I2C_15XX CHIP: LPC15xx I2C driver
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* @ingroup CHIP_15XX_Drivers
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* @{
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*/
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/**
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* @brief I2C register block structure
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*/
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typedef struct { /* I2C0 Structure */
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__IO uint32_t CFG; /*!< I2C Configuration Register common for Master, Slave and Monitor */
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__IO uint32_t STAT; /*!< I2C Status Register common for Master, Slave and Monitor */
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__IO uint32_t INTENSET; /*!< I2C Interrupt Enable Set Register common for Master, Slave and Monitor */
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__O uint32_t INTENCLR; /*!< I2C Interrupt Enable Clear Register common for Master, Slave and Monitor */
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__IO uint32_t TIMEOUT; /*!< I2C Timeout value Register */
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__IO uint32_t CLKDIV; /*!< I2C Clock Divider Register */
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__I uint32_t INTSTAT; /*!< I2C Interrupt Status Register */
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__I uint32_t RESERVED0;
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__IO uint32_t MSTCTL; /*!< I2C Master Control Register */
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__IO uint32_t MSTTIME; /*!< I2C Master Time Register for SCL */
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__IO uint32_t MSTDAT; /*!< I2C Master Data Register */
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__I uint32_t RESERVED1[5];
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__IO uint32_t SLVCTL; /*!< I2C Slave Control Register */
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__IO uint32_t SLVDAT; /*!< I2C Slave Data Register */
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__IO uint32_t SLVADR[4]; /*!< I2C Slave Address Registers */
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__IO uint32_t SLVQUAL0; /*!< I2C Slave Address Qualifier 0 Register */
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__I uint32_t RESERVED2[9];
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__I uint32_t MONRXDAT; /*!< I2C Monitor Data Register */
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} LPC_I2C_T;
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/* Reserved bits masks for registers */
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#define I2C_CFG_RESERVED (~0x1f)
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#define I2C_STAT_RESERVED ((1<<5)|(1<<7)|(0xf<<20)|(0x3fu<<26))
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#define I2C_INTENSET_RESERVED ((7<<1)|(1<<5)|(1<<7)|(3<<9)|(7<<12)|(1<<18)|(0xf<<20)|(0x3fu<<26))
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#define I2C_INTENCLR_RESERVED ((7<<1)|(1<<5)|(1<<7)|(3<<9)|(7<<12)|(1<<18)|(0xf<<20)|(0x3fu<<26))
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#define I2C_TIMEOUT_RESERVED 0xffff0000
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#define I2C_CLKDIV_RESERVED 0xffff0000
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#define I2C_INTSTAT_RESERVED ((7<<1)|(1<<5)|(1<<7)|(3<<9)|(7<<12)|(1<<18)|(0xf<<20)|(0x3fu<<26))
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#define I2C_MSTCTL_RESERVED (~7)
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#define I2C_MSTTIME_RESERVED (~0x7f)
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#define I2C_MSTDAT_RESERVED (~0xff)
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#define I2C_SLVCTL_RESERVED (~3)
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#define I2C_SLVDAT_RESERVED (~0xff)
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#define I2C_SLVADR_RESERVED (~0xff)
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#define I2C_SLVQUAL0_RESERVED (~0xff)
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/*
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* @brief I2C Configuration register Bit definition
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*/
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#define I2C_CFG_MSTEN (1 << 0) /*!< Master Enable/Disable Bit */
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#define I2C_CFG_SLVEN (1 << 1) /*!< Slave Enable/Disable Bit */
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#define I2C_CFG_MONEN (1 << 2) /*!< Monitor Enable/Disable Bit */
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#define I2C_CFG_TIMEOUTEN (1 << 3) /*!< Timeout Enable/Disable Bit */
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#define I2C_CFG_MONCLKSTR (1 << 4) /*!< Monitor Clock Stretching Bit */
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#define I2C_CFG_MASK ((uint32_t) 0x1F) /*!< Configuration register Mask */
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/*
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* @brief I2C Status register Bit definition
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*/
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#define I2C_STAT_MSTPENDING (1 << 0) /*!< Master Pending Status Bit */
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#define I2C_STAT_MSTSTATE (0x7 << 1) /*!< Master State Code */
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#define I2C_STAT_MSTRARBLOSS (1 << 4) /*!< Master Arbitration Loss Bit */
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#define I2C_STAT_MSTSTSTPERR (1 << 6) /*!< Master Start Stop Error Bit */
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#define I2C_STAT_SLVPENDING (1 << 8) /*!< Slave Pending Status Bit */
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#define I2C_STAT_SLVSTATE (0x3 << 9) /*!< Slave State Code */
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#define I2C_STAT_SLVNOTSTR (1 << 11) /*!< Slave not stretching Clock Bit */
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#define I2C_STAT_SLVIDX (0x3 << 12) /*!< Slave Address Index */
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#define I2C_STAT_SLVSEL (1 << 14) /*!< Slave Selected Bit */
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#define I2C_STAT_SLVDESEL (1 << 15) /*!< Slave Deselect Bit */
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#define I2C_STAT_MONRDY (1 << 16) /*!< Monitor Ready Bit */
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#define I2C_STAT_MONOV (1 << 17) /*!< Monitor Overflow Flag */
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#define I2C_STAT_MONACTIVE (1 << 18) /*!< Monitor Active Flag */
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#define I2C_STAT_MONIDLE (1 << 19) /*!< Monitor Idle Flag */
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#define I2C_STAT_EVENTTIMEOUT (1 << 24) /*!< Event Timeout Interrupt Flag */
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#define I2C_STAT_SCLTIMEOUT (1 << 25) /*!< SCL Timeout Interrupt Flag */
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#define I2C_STAT_MSTCODE_IDLE (0) /*!< Master Idle State Code */
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#define I2C_STAT_MSTCODE_RXREADY (1) /*!< Master Receive Ready State Code */
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#define I2C_STAT_MSTCODE_TXREADY (2) /*!< Master Transmit Ready State Code */
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#define I2C_STAT_MSTCODE_NACKADR (3) /*!< Master NACK by slave on address State Code */
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#define I2C_STAT_MSTCODE_NACKDAT (4) /*!< Master NACK by slave on data State Code */
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#define I2C_STAT_SLVCODE_ADDR (0) /*!< Master Idle State Code */
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#define I2C_STAT_SLVCODE_RX (1) /*!< Received data is available Code */
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#define I2C_STAT_SLVCODE_TX (2) /*!< Data can be transmitted Code */
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/*
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* @brief I2C Interrupt Enable Set register Bit definition
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*/
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#define I2C_INTENSET_MSTPENDING (1 << 0) /*!< Master Pending Interrupt Enable Bit */
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#define I2C_INTENSET_MSTRARBLOSS (1 << 4) /*!< Master Arbitration Loss Interrupt Enable Bit */
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#define I2C_INTENSET_MSTSTSTPERR (1 << 6) /*!< Master Start Stop Error Interrupt Enable Bit */
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#define I2C_INTENSET_SLVPENDING (1 << 8) /*!< Slave Pending Interrupt Enable Bit */
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#define I2C_INTENSET_SLVNOTSTR (1 << 11) /*!< Slave not stretching Clock Interrupt Enable Bit */
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#define I2C_INTENSET_SLVDESEL (1 << 15) /*!< Slave Deselect Interrupt Enable Bit */
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#define I2C_INTENSET_MONRDY (1 << 16) /*!< Monitor Ready Interrupt Enable Bit */
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#define I2C_INTENSET_MONOV (1 << 17) /*!< Monitor Overflow Interrupt Enable Bit */
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#define I2C_INTENSET_MONIDLE (1 << 19) /*!< Monitor Idle Interrupt Enable Bit */
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#define I2C_INTENSET_EVENTTIMEOUT (1 << 24) /*!< Event Timeout Interrupt Enable Bit */
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#define I2C_INTENSET_SCLTIMEOUT (1 << 25) /*!< SCL Timeout Interrupt Enable Bit */
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/*
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* @brief I2C Interrupt Enable Clear register Bit definition
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*/
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#define I2C_INTENCLR_MSTPENDING (1 << 0) /*!< Master Pending Interrupt Clear Bit */
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#define I2C_INTENCLR_MSTRARBLOSS (1 << 4) /*!< Master Arbitration Loss Interrupt Clear Bit */
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#define I2C_INTENCLR_MSTSTSTPERR (1 << 6) /*!< Master Start Stop Error Interrupt Clear Bit */
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#define I2C_INTENCLR_SLVPENDING (1 << 8) /*!< Slave Pending Interrupt Clear Bit */
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#define I2C_INTENCLR_SLVNOTSTR (1 << 11) /*!< Slave not stretching Clock Interrupt Clear Bit */
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#define I2C_INTENCLR_SLVDESEL (1 << 15) /*!< Slave Deselect Interrupt Clear Bit */
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#define I2C_INTENCLR_MONRDY (1 << 16) /*!< Monitor Ready Interrupt Clear Bit */
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#define I2C_INTENCLR_MONOV (1 << 17) /*!< Monitor Overflow Interrupt Clear Bit */
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#define I2C_INTENCLR_MONIDLE (1 << 19) /*!< Monitor Idle Interrupt Clear Bit */
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#define I2C_INTENCLR_EVENTTIMEOUT (1 << 24) /*!< Event Timeout Interrupt Clear Bit */
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#define I2C_INTENCLR_SCLTIMEOUT (1 << 25) /*!< SCL Timeout Interrupt Clear Bit */
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/*
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* @brief I2C TimeOut Value Macro
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*/
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#define I2C_TIMEOUT_VAL(n) (((uint32_t) ((n) - 1) & 0xFFF0) | 0x000F) /*!< Macro for Timeout value register */
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/*
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* @brief I2C Interrupt Status register Bit definition
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*/
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#define I2C_INTSTAT_MSTPENDING (1 << 0) /*!< Master Pending Interrupt Status Bit */
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#define I2C_INTSTAT_MSTRARBLOSS (1 << 4) /*!< Master Arbitration Loss Interrupt Status Bit */
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#define I2C_INTSTAT_MSTSTSTPERR (1 << 6) /*!< Master Start Stop Error Interrupt Status Bit */
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#define I2C_INTSTAT_SLVPENDING (1 << 8) /*!< Slave Pending Interrupt Status Bit */
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#define I2C_INTSTAT_SLVNOTSTR (1 << 11) /*!< Slave not stretching Clock Interrupt Status Bit */
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#define I2C_INTSTAT_SLVDESEL (1 << 15) /*!< Slave Deselect Interrupt Status Bit */
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#define I2C_INTSTAT_MONRDY (1 << 16) /*!< Monitor Ready Interrupt Status Bit */
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#define I2C_INTSTAT_MONOV (1 << 17) /*!< Monitor Overflow Interrupt Status Bit */
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#define I2C_INTSTAT_MONIDLE (1 << 19) /*!< Monitor Idle Interrupt Status Bit */
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#define I2C_INTSTAT_EVENTTIMEOUT (1 << 24) /*!< Event Timeout Interrupt Status Bit */
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#define I2C_INTSTAT_SCLTIMEOUT (1 << 25) /*!< SCL Timeout Interrupt Status Bit */
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/*
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* @brief I2C Master Control register Bit definition
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*/
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#define I2C_MSTCTL_MSTCONTINUE (1 << 0) /*!< Master Continue Bit */
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#define I2C_MSTCTL_MSTSTART (1 << 1) /*!< Master Start Control Bit */
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#define I2C_MSTCTL_MSTSTOP (1 << 2) /*!< Master Stop Control Bit */
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#define I2C_MSTCTL_MSTDMA (1 << 3) /*!< Master DMA Enable Bit */
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/*
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* @brief I2C Master Time Register Field definition
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*/
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#define I2C_MSTTIME_MSTSCLLOW (0x07 << 0) /*!< Master SCL Low Time field */
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#define I2C_MSTTIME_MSTSCLHIGH (0x07 << 4) /*!< Master SCL High Time field */
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/*
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* @brief I2C Master Data Mask
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*/
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#define I2C_MSTDAT_DATAMASK ((uint32_t) 0x00FF << 0) /*!< Master data mask */
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/*
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* @brief I2C Slave Control register Bit definition
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*/
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#define I2C_SLVCTL_SLVCONTINUE (1 << 0) /*!< Slave Continue Bit */
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#define I2C_SLVCTL_SLVNACK (1 << 1) /*!< Slave NACK Bit */
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#define I2C_SLVCTL_SLVDMA (1 << 3) /*!< Slave DMA Enable Bit */
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/*
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* @brief I2C Slave Data Mask
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*/
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#define I2C_SLVDAT_DATAMASK ((uint32_t) 0x00FF << 0) /*!< Slave data mask */
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/*
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* @brief I2C Slave Address register Bit definition
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*/
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#define I2C_SLVADR_SADISABLE (1 << 0) /*!< Slave Address n Disable Bit */
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#define I2C_SLVADR_SLVADR (0x7F << 1) /*!< Slave Address field */
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#define I2C_SLVADR_MASK ((uint32_t) 0x00FF) /*!< Slave Address Mask */
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/*
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* @brief I2C Slave Address Qualifier 0 Register Bit definition
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*/
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#define I2C_SLVQUAL_QUALMODE0 (1 << 0) /*!< Slave Qualifier Mode Enable Bit */
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#define I2C_SLVQUAL_SLVQUAL0 (0x7F << 1) /*!< Slave Qualifier Address for Address 0 */
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/*
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* @brief I2C Monitor Data Register Bit definition
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*/
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#define I2C_MONRXDAT_DATA (0xFF << 0) /*!< Monitor Function Receive Data Field */
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#define I2C_MONRXDAT_MONSTART (1 << 8) /*!< Monitor Received Start Bit */
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#define I2C_MONRXDAT_MONRESTART (1 << 9) /*!< Monitor Received Repeated Start Bit */
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#define I2C_MONRXDAT_MONNACK (1 << 10) /*!< Monitor Received Nack Bit */
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/**
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* @brief Initialize I2C Interface
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* @param pI2C : Pointer to selected I2C peripheral
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* @return Nothing
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* @note This function enables the I2C clock for both the master and
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* slave interfaces of the given I2C peripheral. LPC_I2C1, LPC_I2C2 and
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* LPC_I2C3 are available only on LPC82X devices.
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*/
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void Chip_I2C_Init(LPC_I2C_T *pI2C);
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/**
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* @brief Shutdown I2C Interface
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* @param pI2C : Pointer to selected I2C peripheral
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* @return Nothing
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* @note This function disables the I2C clock for both the master and
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* slave interfaces of the given I2C peripheral. Only LPC_I2C0 is available
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* on LPC81X devices.
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*/
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void Chip_I2C_DeInit(LPC_I2C_T *pI2C);
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/**
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* @brief Sets I2C Clock Divider registers
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* @param pI2C : Pointer to selected I2C peripheral
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* @param clkdiv : Clock Divider value for I2C, value is between (1 - 65536)
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* @return Nothing
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* @note The clock to I2C block is determined by the following formula (I2C_PCLK
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* is the frequency of the system clock): <br>
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* I2C Clock Frequency = (I2C_PCLK)/clkdiv;
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*/
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static INLINE void Chip_I2C_SetClockDiv(LPC_I2C_T *pI2C, uint32_t clkdiv)
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{
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if ((clkdiv >= 1) && (clkdiv <= 65536)) {
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pI2C->CLKDIV = clkdiv - 1;
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}
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else {
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pI2C->CLKDIV = 0;
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}
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}
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/**
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* @brief Get I2C Clock Divider registers
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* @param pI2C : Pointer to selected I2C peripheral
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* @return Clock Divider value
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* @note Return the divider value for the I2C block
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* It is the CLKDIV register value + 1
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*/
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static INLINE uint32_t Chip_I2C_GetClockDiv(LPC_I2C_T *pI2C)
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{
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return (pI2C->CLKDIV & 0xFFFF) + 1;
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}
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/**
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* @brief Enable I2C Interrupts
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* @param pI2C : Pointer to selected I2C peripheral
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* @param intEn : ORed Value of I2C_INTENSET_* values to enable
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* @return Nothing
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*/
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static INLINE void Chip_I2C_EnableInt(LPC_I2C_T *pI2C, uint32_t intEn)
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{
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pI2C->INTENSET = intEn;
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}
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/**
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* @brief Disable I2C Interrupts
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* @param pI2C : Pointer to selected I2C peripheral
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* @param intClr : ORed Value of I2C_INTENSET_* values to disable
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* @return Nothing
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*/
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static INLINE void Chip_I2C_DisableInt(LPC_I2C_T *pI2C, uint32_t intClr)
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{
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pI2C->INTENCLR = intClr;
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}
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/**
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* @brief Disable I2C Interrupts
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* @param pI2C : Pointer to selected I2C peripheral
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* @param intClr : ORed Value of I2C_INTENSET_* values to disable
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* @return Nothing
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* @note It is recommended to use the Chip_I2C_DisableInt() function
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* instead of this function.
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*/
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static INLINE void Chip_I2C_ClearInt(LPC_I2C_T *pI2C, uint32_t intClr)
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{
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Chip_I2C_DisableInt(pI2C, intClr);
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}
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/**
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* @brief Returns pending I2C Interrupts
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* @param pI2C : Pointer to selected I2C peripheral
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* @return All pending interrupts, mask with I2C_INTENSET_* to determine specific interrupts
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*/
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static INLINE uint32_t Chip_I2C_GetPendingInt(LPC_I2C_T *pI2C)
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{
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return pI2C->INTSTAT & ~I2C_INTSTAT_RESERVED;
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}
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/**
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* @}
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*/
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/** @defgroup I2CM_8XX CHIP: LPC8XX I2C master-only driver
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* @ingroup I2C_8XX
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* This driver only works in master mode. To describe the I2C transactions
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* following symbols are used in driver documentation.
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*
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* Key to symbols
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* ==============
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* S (1 bit) : Start bit
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* P (1 bit) : Stop bit
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* Rd/Wr (1 bit) : Read/Write bit. Rd equals 1, Wr equals 0.
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* A, NA (1 bit) : Acknowledge and Not-Acknowledge bit.
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* Addr (7 bits): I2C 7 bit address. Note that this can be expanded as usual to
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* get a 10 bit I2C address.
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* Data (8 bits): A plain data byte. Sometimes, I write DataLow, DataHigh
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* for 16 bit data.
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* [..]: Data sent by I2C device, as opposed to data sent by the host adapter.
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* @{
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*/
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/** I2CM_8XX_STATUS_TYPES I2C master transfer status types
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* @{
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*/
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#define I2CM_STATUS_OK 0x00 /*!< Requested Request was executed successfully. */
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#define I2CM_STATUS_ERROR 0x01 /*!< Unknown error condition. */
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#define I2CM_STATUS_NAK_ADR 0x02 /*!< No acknowledgement received from slave during address phase. */
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#define I2CM_STATUS_BUS_ERROR 0x03 /*!< I2C bus error */
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#define I2CM_STATUS_NAK_DAT 0x04 /*!< No acknowledgement received from slave during address phase. */
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#define I2CM_STATUS_ARBLOST 0x05 /*!< Arbitration lost. */
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#define I2CM_STATUS_BUSY 0xFF /*!< I2C transmistter is busy. */
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/**
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* @}
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*/
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/**
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* @brief Master transfer data structure definitions
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*/
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typedef struct {
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const uint8_t *txBuff; /*!< Pointer to array of bytes to be transmitted */
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uint8_t *rxBuff; /*!< Pointer memory where bytes received from I2C be stored */
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uint16_t txSz; /*!< Number of bytes in transmit array,
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if 0 only receive transfer will be carried on */
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uint16_t rxSz; /*!< Number of bytes to received,
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if 0 only transmission we be carried on */
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uint16_t status; /*!< Status of the current I2C transfer */
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uint8_t slaveAddr; /*!< 7-bit I2C Slave address */
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} I2CM_XFER_T;
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/**
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* @brief Set up bus speed for LPC_I2C controller
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* @param pI2C : Pointer to selected I2C peripheral
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* @param busSpeed : I2C bus clock rate
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* @return Nothing
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* @note Per I2C specification the busSpeed should be
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* @li 100000 for Standard mode
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* @li 400000 for Fast mode
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* @li 1000000 for Fast mode plus
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* IOCON registers corresponding to I2C pads should be updated
|
|
* according to the bus mode.
|
|
*/
|
|
void Chip_I2CM_SetBusSpeed(LPC_I2C_T *pI2C, uint32_t busSpeed);
|
|
|
|
/**
|
|
* @brief Enable I2C Master interface
|
|
* @param pI2C : Pointer to selected I2C peripheral
|
|
* @return Nothing
|
|
* @note
|
|
*/
|
|
static INLINE void Chip_I2CM_Enable(LPC_I2C_T *pI2C)
|
|
{
|
|
pI2C->CFG = (pI2C->CFG & I2C_CFG_MASK) | I2C_CFG_MSTEN;
|
|
}
|
|
|
|
/**
|
|
* @brief Disable I2C Master interface
|
|
* @param pI2C : Pointer to selected I2C peripheral
|
|
* @return Nothing
|
|
* @note
|
|
*/
|
|
static INLINE void Chip_I2CM_Disable(LPC_I2C_T *pI2C)
|
|
{
|
|
pI2C->CFG = (pI2C->CFG & I2C_CFG_MASK) & ~I2C_CFG_MSTEN;
|
|
}
|
|
|
|
/**
|
|
* @brief Get I2C Status
|
|
* @param pI2C : Pointer to selected I2C peripheral
|
|
* @return I2C Status register value
|
|
* @note This function returns the value of the status register.
|
|
*/
|
|
static INLINE uint32_t Chip_I2CM_GetStatus(LPC_I2C_T *pI2C)
|
|
{
|
|
return pI2C->STAT & ~I2C_STAT_RESERVED;
|
|
}
|
|
|
|
/**
|
|
* @brief Clear I2C status bits (master)
|
|
* @param pI2C : Pointer to selected I2C peripheral
|
|
* @param clrStatus : Status bit to clear, ORed Value of I2C_STAT_MSTRARBLOSS and I2C_STAT_MSTSTSTPERR
|
|
* @return Nothing
|
|
* @note This function clears selected status flags.
|
|
*/
|
|
static INLINE void Chip_I2CM_ClearStatus(LPC_I2C_T *pI2C, uint32_t clrStatus)
|
|
{
|
|
/* Clear Master Arbitration Loss and Start, Stop Error */
|
|
pI2C->STAT = clrStatus & (I2C_STAT_MSTRARBLOSS | I2C_STAT_MSTSTSTPERR);
|
|
}
|
|
|
|
/**
|
|
* @brief Check if I2C Master is pending
|
|
* @param pI2C : Pointer to selected I2C peripheral
|
|
* @return Returns TRUE if the Master is pending else returns FALSE
|
|
* @note
|
|
*/
|
|
static INLINE bool Chip_I2CM_IsMasterPending(LPC_I2C_T *pI2C)
|
|
{
|
|
return (pI2C->STAT & I2C_STAT_MSTPENDING) != 0;
|
|
}
|
|
|
|
/**
|
|
* @brief Get current state of the I2C Master
|
|
* @param pI2C : Pointer to selected I2C peripheral
|
|
* @return Master State Code, a value in the range of 0 - 4
|
|
* @note After the Master is pending this state code tells the reason
|
|
* for Master pending.
|
|
*/
|
|
static INLINE uint32_t Chip_I2CM_GetMasterState(LPC_I2C_T *pI2C)
|
|
{
|
|
return (pI2C->STAT & I2C_STAT_MSTSTATE) >> 1;
|
|
}
|
|
|
|
/**
|
|
* @brief Transmit START or Repeat-START signal on I2C bus
|
|
* @param pI2C : Pointer to selected I2C peripheral
|
|
* @return Nothing
|
|
* @note This function sets the controller to transmit START condition when
|
|
* the bus becomes free. This should be called only when master is pending.
|
|
* The function writes a complete value to Master Control register, ORing is not advised.
|
|
*/
|
|
static INLINE void Chip_I2CM_SendStart(LPC_I2C_T *pI2C)
|
|
{
|
|
pI2C->MSTCTL = I2C_MSTCTL_MSTSTART;
|
|
}
|
|
|
|
/**
|
|
* @brief Transmit STOP signal on I2C bus
|
|
* @param pI2C : Pointer to selected I2C peripheral
|
|
* @return Nothing
|
|
* @note This function sets the controller to transmit STOP condition.
|
|
* This should be called only when master is pending. The function writes a
|
|
* complete value to Master Control register, ORing is not advised.
|
|
*/
|
|
static INLINE void Chip_I2CM_SendStop(LPC_I2C_T *pI2C)
|
|
{
|
|
pI2C->MSTCTL = I2C_MSTCTL_MSTSTOP;
|
|
}
|
|
|
|
/**
|
|
* @brief Master Continue transfer operation
|
|
* @param pI2C : Pointer to selected I2C peripheral
|
|
* @return Nothing
|
|
* @note This function sets the master controller to continue transmission.
|
|
* This should be called only when master is pending. The function writes a
|
|
* complete value to Master Control register, ORing is not advised.
|
|
*/
|
|
static INLINE void Chip_I2CM_MasterContinue(LPC_I2C_T *pI2C)
|
|
{
|
|
pI2C->MSTCTL = I2C_MSTCTL_MSTCONTINUE;
|
|
}
|
|
|
|
/**
|
|
* @brief Transmit a single data byte through the I2C peripheral (master)
|
|
* @param pI2C : Pointer to selected I2C peripheral
|
|
* @param data : Byte to transmit
|
|
* @return Nothing
|
|
* @note This function attempts to place a byte into the I2C Master
|
|
* Data Register
|
|
*
|
|
*/
|
|
static INLINE void Chip_I2CM_WriteByte(LPC_I2C_T *pI2C, uint8_t data)
|
|
{
|
|
pI2C->MSTDAT = (uint32_t) data;
|
|
}
|
|
|
|
/**
|
|
* @brief Read a single byte data from the I2C peripheral (master)
|
|
* @param pI2C : Pointer to selected I2C peripheral
|
|
* @return A single byte of data read
|
|
* @note This function reads a byte from the I2C receive hold register
|
|
* regardless of I2C state.
|
|
*/
|
|
static INLINE uint8_t Chip_I2CM_ReadByte(LPC_I2C_T *pI2C)
|
|
{
|
|
return (uint8_t) (pI2C->MSTDAT & I2C_MSTDAT_DATAMASK);
|
|
}
|
|
|
|
/**
|
|
* @brief Transfer state change handler
|
|
* @param pI2C : Pointer to selected I2C peripheral
|
|
* @param xfer : Pointer to a I2CM_XFER_T structure see notes below
|
|
* @return Returns non-zero value on completion of transfer. The @a status
|
|
* member of @a xfer structure contains the current status of the
|
|
* transfer at the end of the call.
|
|
* @note
|
|
* The parameter @a xfer should be same as the one passed to Chip_I2CM_Xfer()
|
|
* routine. This function should be called from the I2C interrupt handler
|
|
* only when a master interrupt occurs.
|
|
*/
|
|
uint32_t Chip_I2CM_XferHandler(LPC_I2C_T *pI2C, I2CM_XFER_T *xfer);
|
|
|
|
/**
|
|
* @brief Transmit and Receive data in master mode
|
|
* @param pI2C : Pointer to selected I2C peripheral
|
|
* @param xfer : Pointer to a I2CM_XFER_T structure see notes below
|
|
* @return Nothing
|
|
* @note
|
|
* The parameter @a xfer should have its member @a slaveAddr initialized
|
|
* to the 7-Bit slave address to which the master will do the xfer, Bit0
|
|
* to bit6 should have the address and Bit8 is ignored. During the transfer
|
|
* no code (like event handler) must change the content of the memory
|
|
* pointed to by @a xfer. The member of @a xfer, @a txBuff and @a txSz be
|
|
* initialized to the memory from which the I2C must pick the data to be
|
|
* transfered to slave and the number of bytes to send respectively, similarly
|
|
* @a rxBuff and @a rxSz must have pointer to memory where data received
|
|
* from slave be stored and the number of data to get from slave respectilvely.
|
|
* Following types of transfers are possible:
|
|
* - Write-only transfer: When @a rxSz member of @a xfer is set to 0.
|
|
*
|
|
* S Addr Wr [A] txBuff0 [A] txBuff1 [A] ... txBuffN [A] P
|
|
*
|
|
* - If I2CM_XFER_OPTION_IGNORE_NACK is set in @a options memeber
|
|
*
|
|
* S Addr Wr [A] txBuff0 [A or NA] ... txBuffN [A or NA] P
|
|
*
|
|
* - Read-only transfer: When @a txSz member of @a xfer is set to 0.
|
|
*
|
|
* S Addr Rd [A] [rxBuff0] A [rxBuff1] A ... [rxBuffN] NA P
|
|
*
|
|
* - If I2CM_XFER_OPTION_LAST_RX_ACK is set in @a options memeber
|
|
*
|
|
* S Addr Rd [A] [rxBuff0] A [rxBuff1] A ... [rxBuffN] A P
|
|
*
|
|
* - Read-Write transfer: When @a rxSz and @ txSz members of @a xfer are non-zero.
|
|
*
|
|
* S Addr Wr [A] txBuff0 [A] txBuff1 [A] ... txBuffN [A]
|
|
* S Addr Rd [A] [rxBuff0] A [rxBuff1] A ... [rxBuffN] NA P
|
|
*
|
|
*/
|
|
void Chip_I2CM_Xfer(LPC_I2C_T *pI2C, I2CM_XFER_T *xfer);
|
|
|
|
/**
|
|
* @brief Transmit and Receive data in master mode
|
|
* @param pI2C : Pointer to selected I2C peripheral
|
|
* @param xfer : Pointer to a I2CM_XFER_T structure see notes below
|
|
* @return Returns non-zero value on succesful completion of transfer.
|
|
* @note
|
|
* This function operates same as Chip_I2CM_Xfer(), but is a blocking call.
|
|
*/
|
|
uint32_t Chip_I2CM_XferBlocking(LPC_I2C_T *pI2C, I2CM_XFER_T *xfer);
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
|
|
/** @defgroup I2CS_8XX CHIP: LPC8XX I2C slave-only driver
|
|
* @ingroup I2C_8XX
|
|
* This driver only works in slave mode.
|
|
* @{
|
|
*/
|
|
|
|
/** @brief I2C slave service start callback
|
|
* This callback is called from the I2C slave handler when an I2C slave address is
|
|
* received and needs servicing. It's used to indicate the start of a slave transfer
|
|
* that will happen on the slave bus.
|
|
*/
|
|
typedef void (*I2CSlaveXferStart)(uint8_t addr);
|
|
|
|
/** @brief I2C slave send data callback
|
|
* This callback is called from the I2C slave handler when an I2C slave address needs
|
|
* data to send. Return 0 to NACK the master and terminate the transfer, or return
|
|
* a non-0 value with the value to send in *data.
|
|
*/
|
|
typedef uint8_t (*I2CSlaveXferSend)(uint8_t *data);
|
|
|
|
/** @brief I2C slave receive data callback
|
|
* This callback is called from the I2C slave handler when an I2C slave address has
|
|
* receive data. Return 0 to NACK the master and terminate the transfer, or return
|
|
* a non-0 value to continue the transfer.
|
|
*/
|
|
typedef uint8_t (*I2CSlaveXferRecv)(uint8_t data);
|
|
|
|
/** @brief I2C slave service done callback
|
|
* This callback is called from the I2C slave handler when an I2C slave transfer is
|
|
* completed. It's used to indicate the end of a slave transfer.
|
|
*/
|
|
typedef void (*I2CSlaveXferDone)(void);
|
|
|
|
/**
|
|
* Slave transfer are performed using 3 callbacks. These 3 callbacks handle most I2C
|
|
* slave transfer cases. When the slave is setup and a slave interrupt is receive
|
|
* and processed with the Chip_I2CS_XferHandler() function in the I2C interrupt handler,
|
|
* one of these 3 callbacks is called. The callbacks can be used for unsized transfers
|
|
* from the master.
|
|
*
|
|
* When an address is received, the SlaveXferAddr() callback is called with the
|
|
* received address. Only addresses enabled in the slave controller will be handled.
|
|
* The slave controller can support up to 4 slave addresses.
|
|
*
|
|
* If the master is going to perform a read operation, the SlaveXferSend() callback
|
|
* is called. Place the data byte to send in *data and return a non-0 value to the
|
|
* caller, or return 0 to NACK the master. (Note the master ACKS/NACKS to slave
|
|
* on reads, so this won't necessarily stop the slave transfer.)<br>
|
|
*
|
|
* If the master performs a write operation, the SlaveXferRecv() callback is called
|
|
* with the received data. Return a non-0 value to the caller, or return 0 to NACK
|
|
* the master.<br>
|
|
*
|
|
* Once the transfer completes, the SlaveXferDone() callback will be called.<br>
|
|
*/
|
|
typedef struct {
|
|
I2CSlaveXferStart slaveStart; /*!< Called when an matching I2C slave address is received */
|
|
I2CSlaveXferSend slaveSend; /*!< Called when a byte is needed to send to master */
|
|
I2CSlaveXferRecv slaveRecv; /*!< Called when a byte is received from master */
|
|
I2CSlaveXferDone slaveDone; /*!< Called when a slave transfer is complete */
|
|
} I2CS_XFER_T;
|
|
|
|
/**
|
|
* @brief Enable I2C slave interface
|
|
* @param pI2C : Pointer to selected I2C peripheral
|
|
* @return Nothing
|
|
* @note Do not call this function until the slave interface is fully configured.
|
|
*/
|
|
STATIC INLINE void Chip_I2CS_Enable(LPC_I2C_T *pI2C)
|
|
{
|
|
pI2C->CFG = (pI2C->CFG & I2C_CFG_MASK) | I2C_CFG_SLVEN;
|
|
}
|
|
|
|
/**
|
|
* @brief Disable I2C slave interface
|
|
* @param pI2C : Pointer to selected I2C peripheral
|
|
* @return Nothing
|
|
*/
|
|
STATIC INLINE void Chip_I2CS_Disable(LPC_I2C_T *pI2C)
|
|
{
|
|
pI2C->CFG = (pI2C->CFG & I2C_CFG_MASK) & ~I2C_CFG_SLVEN;
|
|
}
|
|
|
|
/**
|
|
* @brief Get I2C Status
|
|
* @param pI2C : Pointer to selected I2C peripheral
|
|
* @return I2C Status register value
|
|
* @note This function returns the value of the status register.
|
|
*/
|
|
STATIC INLINE uint32_t Chip_I2CS_GetStatus(LPC_I2C_T *pI2C)
|
|
{
|
|
return pI2C->STAT & ~I2C_STAT_RESERVED;
|
|
}
|
|
|
|
/**
|
|
* @brief Clear I2C status bits (slave)
|
|
* @param pI2C : Pointer to selected I2C peripheral
|
|
* @param clrStatus : Status bit to clear, must be I2C_STAT_SLVDESEL
|
|
* @return Nothing
|
|
* @note This function clears selected status flags.
|
|
*/
|
|
STATIC INLINE void Chip_I2CS_ClearStatus(LPC_I2C_T *pI2C, uint32_t clrStatus)
|
|
{
|
|
pI2C->STAT = clrStatus & I2C_STAT_SLVDESEL;
|
|
}
|
|
|
|
/**
|
|
* @brief Check if I2C slave is pending
|
|
* @param pI2C : Pointer to selected I2C peripheral
|
|
* @return Returns TRUE if the slave is pending else returns FALSE
|
|
* @note
|
|
*/
|
|
STATIC INLINE bool Chip_I2CS_IsSlavePending(LPC_I2C_T *pI2C)
|
|
{
|
|
return (pI2C->STAT & I2C_STAT_SLVPENDING) != 0;
|
|
}
|
|
|
|
/**
|
|
* @brief Check if I2C slave is selected
|
|
* @param pI2C : Pointer to selected I2C peripheral
|
|
* @return Returns TRUE if the slave is is selected, otherwise FALSE
|
|
* @note
|
|
*/
|
|
STATIC INLINE bool Chip_I2CS_IsSlaveSelected(LPC_I2C_T *pI2C)
|
|
{
|
|
return (pI2C->STAT & I2C_STAT_SLVSEL) != 0;
|
|
}
|
|
|
|
/**
|
|
* @brief Check if I2C slave is deselected
|
|
* @param pI2C : Pointer to selected I2C peripheral
|
|
* @return Returns TRUE if the slave is is deselected, otherwise FALSE
|
|
* @note
|
|
*/
|
|
STATIC INLINE bool Chip_I2CS_IsSlaveDeSelected(LPC_I2C_T *pI2C)
|
|
{
|
|
return (pI2C->STAT & I2C_STAT_SLVDESEL) != 0;
|
|
}
|
|
|
|
/**
|
|
* @brief Get current state of the I2C slave
|
|
* @param pI2C : Pointer to selected I2C peripheral
|
|
* @return slave State Code, a value of type I2C_STAT_SLVCODE_*
|
|
* @note After the slave is pending this state code tells the reason
|
|
* for slave pending.
|
|
*/
|
|
STATIC INLINE uint32_t Chip_I2CS_GetSlaveState(LPC_I2C_T *pI2C)
|
|
{
|
|
return (pI2C->STAT & I2C_STAT_SLVSTATE) >> 9;
|
|
}
|
|
|
|
/**
|
|
* @brief Returns the current slave address match index
|
|
* @param pI2C : Pointer to selected I2C peripheral
|
|
* @return slave match index, 0 - 3
|
|
*/
|
|
STATIC INLINE uint32_t Chip_I2CS_GetSlaveMatchIndex(LPC_I2C_T *pI2C)
|
|
{
|
|
return (pI2C->STAT & I2C_STAT_SLVIDX) >> 12;
|
|
}
|
|
|
|
/**
|
|
* @brief Slave Continue transfer operation (ACK)
|
|
* @param pI2C : Pointer to selected I2C peripheral
|
|
* @return Nothing
|
|
* @note This function sets the slave controller to continue transmission.
|
|
* This should be called only when slave is pending. The function writes a
|
|
* complete value to slave Control register, ORing is not advised.
|
|
*/
|
|
STATIC INLINE void Chip_I2CS_SlaveContinue(LPC_I2C_T *pI2C)
|
|
{
|
|
pI2C->SLVCTL = I2C_SLVCTL_SLVCONTINUE;
|
|
}
|
|
|
|
/**
|
|
* @brief Slave NACK operation
|
|
* @param pI2C : Pointer to selected I2C peripheral
|
|
* @return Nothing
|
|
* @note This function sets the slave controller to NAK the master.
|
|
*/
|
|
STATIC INLINE void Chip_I2CS_SlaveNACK(LPC_I2C_T *pI2C)
|
|
{
|
|
pI2C->SLVCTL = I2C_SLVCTL_SLVNACK;
|
|
}
|
|
|
|
/**
|
|
* @brief Transmit a single data byte through the I2C peripheral (slave)
|
|
* @param pI2C : Pointer to selected I2C peripheral
|
|
* @param data : Byte to transmit
|
|
* @return Nothing
|
|
* @note This function attempts to place a byte into the I2C slave
|
|
* Data Register
|
|
*
|
|
*/
|
|
STATIC INLINE void Chip_I2CS_WriteByte(LPC_I2C_T *pI2C, uint8_t data)
|
|
{
|
|
pI2C->SLVDAT = (uint32_t) data;
|
|
}
|
|
|
|
/**
|
|
* @brief Read a single byte data from the I2C peripheral (slave)
|
|
* @param pI2C : Pointer to selected I2C peripheral
|
|
* @return A single byte of data read
|
|
* @note This function reads a byte from the I2C receive hold register
|
|
* regardless of I2C state.
|
|
*/
|
|
STATIC INLINE uint8_t Chip_I2CS_ReadByte(LPC_I2C_T *pI2C)
|
|
{
|
|
return (uint8_t) (pI2C->SLVDAT & I2C_SLVDAT_DATAMASK);
|
|
}
|
|
|
|
/**
|
|
* @brief Set a I2C slave address for slave operation
|
|
* @param pI2C : Pointer to selected I2C peripheral
|
|
* @param slvNum : Possible slave address number, between 0 - 3
|
|
* @param slvAddr : Slave Address for the index (7-bits, bit 7 = 0)
|
|
* @return Nothing
|
|
* @note Setting a slave address also enables the slave address. Do
|
|
* not 'pre-shift' the slave address.
|
|
*/
|
|
STATIC INLINE void Chip_I2CS_SetSlaveAddr(LPC_I2C_T *pI2C, uint8_t slvNum, uint8_t slvAddr)
|
|
{
|
|
pI2C->SLVADR[slvNum] = (uint32_t) (slvAddr << 1);
|
|
}
|
|
|
|
/**
|
|
* @brief Return a I2C programmed slave address
|
|
* @param pI2C : Pointer to selected I2C peripheral
|
|
* @param slvNum : Possible slave address number, between 0 - 3
|
|
* @return Nothing
|
|
*/
|
|
STATIC INLINE uint8_t Chip_I2CS_GetSlaveAddr(LPC_I2C_T *pI2C, uint8_t slvNum)
|
|
{
|
|
return (pI2C->SLVADR[slvNum] >> 1) & 0x7F;
|
|
}
|
|
|
|
/**
|
|
* @brief Enable a I2C address
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* @param pI2C : Pointer to selected I2C peripheral
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* @param slvNum : Possible slave address number, between 0 - 3
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* @return Nothing
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*/
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STATIC INLINE void Chip_I2CS_EnableSlaveAddr(LPC_I2C_T *pI2C, uint8_t slvNum)
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{
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pI2C->SLVADR[slvNum] = (pI2C->SLVADR[slvNum] & I2C_SLVADR_MASK) & ~I2C_SLVADR_SADISABLE;
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}
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/**
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* @brief Disable a I2C address
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* @param pI2C : Pointer to selected I2C peripheral
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* @param slvNum : Possible slave address number, between 0 - 3
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* @return Nothing
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*/
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STATIC INLINE void Chip_I2CS_DisableSlaveAddr(LPC_I2C_T *pI2C, uint8_t slvNum)
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{
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pI2C->SLVADR[slvNum] = (pI2C->SLVADR[slvNum] & I2C_SLVADR_MASK) | I2C_SLVADR_SADISABLE;
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}
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/**
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* @brief Setup slave qialifier address
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* @param pI2C : Pointer to selected I2C peripheral
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* @param extend : true to extend I2C slave detect address 0 range, or false to match to corresponding bits
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* @param slvNum : Slave address qualifier, see SLVQUAL0 register in User Manual
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* @return Nothing
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* @note Do not 'pre-shift' the slave address.
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|
*/
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STATIC INLINE void Chip_I2CS_SetSlaveQual0(LPC_I2C_T *pI2C, bool extend, uint8_t slvNum)
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|
{
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slvNum = slvNum << 1;
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if (extend) {
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slvNum |= I2C_SLVQUAL_QUALMODE0;
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}
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|
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pI2C->SLVQUAL0 = slvNum;
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}
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|
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/**
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* @brief Slave transfer state change handler
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|
* @param pI2C : Pointer to selected I2C peripheral
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|
* @param xfers : Pointer to a I2CS_MULTI_XFER_T structure see notes below
|
|
* @return Returns non-zero value on completion of transfer
|
|
* @note See @ref I2CS_XFER_T for more information on this function. When using
|
|
* this function, the I2C_INTENSET_SLVPENDING and I2C_INTENSET_SLVDESEL interrupts
|
|
* should be enabled and setup in the I2C interrupt handler to call this function
|
|
* when they fire.
|
|
*/
|
|
uint32_t Chip_I2CS_XferHandler(LPC_I2C_T *pI2C, const I2CS_XFER_T *xfers);
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|
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
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|
#endif /* __I2C_COMMON_8XX_H_ */
|