311 lines
8.2 KiB
C
311 lines
8.2 KiB
C
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/****************************************************************************//**
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* @file i2c.c
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* @version V0.10
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* $Revision: 13 $
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* $Date: 14/09/30 1:10p $
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* @brief NUC472/NUC442 I2C driver source file
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*
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* @note
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* Copyright (C) 2014 Nuvoton Technology Corp. All rights reserved.
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*****************************************************************************/
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#include "NUC472_442.h"
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/** @addtogroup NUC472_442_Device_Driver NUC472/NUC442 Device Driver
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@{
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*/
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/** @addtogroup NUC472_442_I2C_Driver I2C Driver
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@{
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*/
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/** @addtogroup NUC472_442_I2C_EXPORTED_FUNCTIONS I2C Exported Functions
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@{
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*/
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/**
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* @brief This function make I2C module be ready and set the wanted bus clock.
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* @param[in] i2c is the base address of I2C module.
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* @param[in] u32BusClock is the target bus speed of I2C module.
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* @return Actual I2C bus clock frequency.
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*/
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uint32_t I2C_Open(I2C_T *i2c, uint32_t u32BusClock)
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{
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uint32_t u32Div;
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uint32_t u32Pclk = CLK_GetPCLKFreq();
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u32Div = (uint32_t) ((( u32Pclk * 10)/(u32BusClock * 4) + 5) / 10 - 1); /* Compute proper divider for I2C clock */
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i2c->CLKDIV = u32Div;
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/* Enable I2C */
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i2c->CTL |= I2C_CTL_I2CEN_Msk;
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return ( u32Pclk / ((u32Div+1)<<2) );
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}
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/**
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* @brief This function closes the I2C module.
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* @param[in] i2c is the base address of I2C module.
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* @return none
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*/
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void I2C_Close(I2C_T *i2c)
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{
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/* Reset SPI */
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if((uint32_t)i2c == I2C0_BASE) {
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SYS->IPRST1 |= SYS_IPRST1_I2C0RST_Msk;
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SYS->IPRST1 &= ~SYS_IPRST1_I2C0RST_Msk;
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} else if((uint32_t)i2c == I2C1_BASE) {
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SYS->IPRST1 |= SYS_IPRST1_I2C1RST_Msk;
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SYS->IPRST1 &= ~SYS_IPRST1_I2C1RST_Msk;
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} else if((uint32_t)i2c == I2C2_BASE) {
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SYS->IPRST1 |= SYS_IPRST1_I2C2RST_Msk;
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SYS->IPRST1 &= ~SYS_IPRST1_I2C2RST_Msk;
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} else {
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SYS->IPRST1 |= SYS_IPRST1_I2C3RST_Msk;
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SYS->IPRST1 &= ~SYS_IPRST1_I2C3RST_Msk;
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}
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/* Disable I2C */
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i2c->CTL &= ~I2C_CTL_I2CEN_Msk;
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}
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/**
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* @brief This function clears the time-out flag.
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* @param[in] i2c is the base address of I2C module.
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* @return none
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*/
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void I2C_ClearTimeoutFlag(I2C_T *i2c)
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{
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i2c->TOCTL |= I2C_TOCTL_TOIF_Msk;
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}
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/**
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* @brief This function sets the control bit of the I2C module.
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* @param[in] i2c is the base address of I2C module.
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* @param[in] u8Start sets START bit to I2C module.
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* @param[in] u8Stop sets STOP bit to I2C module.
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* @param[in] u8Si sets SI bit to I2C module.
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* @param[in] u8Ack sets ACK bit to I2C module.
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* @return none
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*/
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void I2C_Trigger(I2C_T *i2c, uint8_t u8Start, uint8_t u8Stop, uint8_t u8Si, uint8_t u8Ack)
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{
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uint32_t u32Reg = 0;
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uint32_t u32Val = i2c->CTL & ~(I2C_STA | I2C_STO | I2C_AA);
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if (u8Start)
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u32Reg |= I2C_STA;
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if (u8Stop)
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u32Reg |= I2C_STO;
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if (u8Si)
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u32Reg |= I2C_SI;
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if (u8Ack)
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u32Reg |= I2C_AA;
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i2c->CTL = u32Val | u32Reg;
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}
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/**
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* @brief This function disables the interrupt of I2C module.
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* @param[in] i2c is the base address of I2C module.
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* @return none
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*/
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void I2C_DisableInt(I2C_T *i2c)
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{
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i2c->CTL &= ~I2C_CTL_INTEN_Msk;
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}
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/**
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* @brief This function enables the interrupt (EI bit) of I2C module.
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* @param[in] i2c is the base address of I2C module.
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* @return none
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*/
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void I2C_EnableInt(I2C_T *i2c)
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{
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i2c->CTL |= I2C_CTL_INTEN_Msk;
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}
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/**
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* @brief This function returns the real bus clock of I2C module.
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* @param[in] i2c is the base address of I2C module.
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* @return Actual I2C bus clock frequency.
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*/
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uint32_t I2C_GetBusClockFreq(I2C_T *i2c)
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{
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uint32_t u32Divider = i2c->CLKDIV;
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return ( CLK_GetPCLKFreq() / ((u32Divider+1)<<2) );
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}
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/**
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* @brief This function sets bus frequency of I2C module.
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* @param[in] i2c is the base address of I2C module.
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* @param[in] u32BusClock is the target bus speed of I2C module.
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* @return Actual I2C bus clock frequency.
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*/
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uint32_t I2C_SetBusClockFreq(I2C_T *i2c, uint32_t u32BusClock)
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{
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uint32_t u32Div;
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uint32_t u32Pclk = CLK_GetPCLKFreq();
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u32Div = (uint32_t) (((u32Pclk * 10)/(u32BusClock * 4) + 5) / 10 - 1); /* Compute proper divider for I2C clock */
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i2c->CLKDIV = u32Div;
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return ( u32Pclk / ((u32Div+1)<<2) );
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}
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/**
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* @brief This function gets the interrupt flag of I2C module.
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* @param[in] i2c is the base address of I2C module.
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* @return Interrupt flag.
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* @retval 0 Flag is not set.
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* @retval 1 Flag is set.
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*/
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uint32_t I2C_GetIntFlag(I2C_T *i2c)
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{
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return ( (i2c->CTL & I2C_CTL_SI_Msk) == I2C_CTL_SI_Msk ? 1:0 );
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}
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/**
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* @brief This function returns the status of I2C module.
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* @param[in] i2c is the base address of I2C module.
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* @return I2C status
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*/
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uint32_t I2C_GetStatus(I2C_T *i2c)
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{
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return ( i2c->STATUS );
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}
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/**
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* @brief This function returns the data stored in data register of I2C module.
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* @param[in] i2c is the base address of I2C module.
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* @return I2C data.
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*/
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uint32_t I2C_GetData(I2C_T *i2c)
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{
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return ( i2c->DAT );
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}
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/**
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* @brief This function writes the data to data register of I2C module.
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* @param[in] i2c is the base address of I2C module.
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* @param[in] u8Data is the data which will be write to data register of I2C module.
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* @return none
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*/
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void I2C_SetData(I2C_T *i2c, uint8_t u8Data)
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{
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i2c->DAT = u8Data;
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}
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/**
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* @brief Configure slave address and enable GC mode.
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* @param[in] i2c is the base address of I2C module.
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* @param[in] u8SlaveNo is the set number of salve address.
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* @param[in] u8SlaveAddr is the slave address.
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* @param[in] u8GCMode GC mode enable or not. Valid values are:
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* - \ref I2C_GCMODE_ENABLE
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* - \ref I2C_GCMODE_DISABLE
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* @return none
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*/
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void I2C_SetSlaveAddr(I2C_T *i2c, uint8_t u8SlaveNo, uint8_t u8SlaveAddr, uint8_t u8GCMode)
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{
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switch (u8SlaveNo) {
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case 0:
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i2c->ADDR0 = (u8SlaveAddr << 1) | u8GCMode;
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break;
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case 1:
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i2c->ADDR1 = (u8SlaveAddr << 1) | u8GCMode;
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break;
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case 2:
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i2c->ADDR2 = (u8SlaveAddr << 1) | u8GCMode;
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break;
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case 3:
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i2c->ADDR3 = (u8SlaveAddr << 1) | u8GCMode;
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break;
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default:
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i2c->ADDR0 = (u8SlaveAddr << 1) | u8GCMode;
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}
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}
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/**
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* @brief Configure the mask of slave address. The corresponding address bit is "Don't Care".
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* @param[in] i2c is the base address of I2C module.
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* @param[in] u8SlaveNo is the set number of salve address.
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* @param[in] u8SlaveAddrMask is the slave address mask.
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* @return none
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*/
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void I2C_SetSlaveAddrMask(I2C_T *i2c, uint8_t u8SlaveNo, uint8_t u8SlaveAddrMask)
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{
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switch (u8SlaveNo) {
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case 0:
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i2c->ADDRMSK0 = u8SlaveAddrMask << 1;
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break;
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case 1:
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i2c->ADDRMSK1 = u8SlaveAddrMask << 1;
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break;
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case 2:
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i2c->ADDRMSK2 = u8SlaveAddrMask << 1;
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break;
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case 3:
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i2c->ADDRMSK3 = u8SlaveAddrMask << 1;
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break;
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default:
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i2c->ADDRMSK0 = u8SlaveAddrMask << 1;
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}
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}
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/**
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* @brief This function enables timeout function and configures DIV4 function to support long timeout.
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* @param[in] i2c is the base address of I2C module.
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* @param[in] u8LongTimeout Enable timeout counter input clock is divide by 4.
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* @return none
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*/
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void I2C_EnableTimeout(I2C_T *i2c, uint8_t u8LongTimeout)
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{
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if(u8LongTimeout)
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i2c->TOCTL |= I2C_TOCTL_TOCDIV4_Msk;
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else
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i2c->TOCTL &= ~I2C_TOCTL_TOCDIV4_Msk;
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i2c->TOCTL |= I2C_TOCTL_TOCEN_Msk;
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}
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/**
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* @brief This function disables time-out function.
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* @param[in] i2c is the base address of I2C module.
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* @return none
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*/
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void I2C_DisableTimeout(I2C_T *i2c)
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{
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i2c->TOCTL &= ~I2C_TOCTL_TOCEN_Msk;
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}
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/**
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* @brief This function enables the wakeup function of I2C module.
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* @param[in] i2c is the base address of I2C module.
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* @return none
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*/
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void I2C_EnableWakeup(I2C_T *i2c)
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{
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i2c->WKCTL |= I2C_WKCTL_WKEN_Msk;
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}
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/**
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* @brief This function disables the wakeup function of I2C module.
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* @param[in] i2c is the base address of I2C module.
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* @return none
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*/
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void I2C_DisableWakeup(I2C_T *i2c)
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{
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i2c->WKCTL &= ~I2C_WKCTL_WKEN_Msk;
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}
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/*@}*/ /* end of group NUC472_442_I2C_EXPORTED_FUNCTIONS */
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/*@}*/ /* end of group NUC472_442_I2C_Driver */
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/*@}*/ /* end of group NUC472_442_Device_Driver */
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/*** (C) COPYRIGHT 2014 Nuvoton Technology Corp. ***/
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