486 lines
14 KiB
C
486 lines
14 KiB
C
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/*****************************************************************************
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* Copyright (c) 2019, Nations Technologies Inc.
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*
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* All rights reserved.
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* ****************************************************************************
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the disclaimer below.
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*
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* Nations' name may not be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* DISCLAIMER: THIS SOFTWARE IS PROVIDED BY NATIONS "AS IS" AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
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* DISCLAIMED. IN NO EVENT SHALL NATIONS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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* ****************************************************************************/
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/**
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* @file drv_i2c.c
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* @author Nations
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* @version v1.0.0
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*
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* @copyright Copyright (c) 2019, Nations Technologies Inc. All rights reserved.
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*/
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#include <rthw.h>
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#include <rtthread.h>
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#include "drv_i2c.h"
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#include "board.h"
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#ifdef RT_USING_I2C
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#include <rtdevice.h>
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#define DBG_TAG "drv.I2C"
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#ifdef RT_I2C_DEBUG
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#define DBG_LVL DBG_LOG
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#else
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#define DBG_LVL DBG_INFO
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#endif
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#include <rtdbg.h>
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#define I2CT_FLAG_TIMEOUT ((uint32_t)0x1000)
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#define I2CT_LONG_TIMEOUT ((uint32_t)(10 * I2CT_FLAG_TIMEOUT))
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#ifdef RT_USING_I2C_BITOPS
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/*user can change this*/
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#define I2C_BUS_NAME "i2c1"
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/*user should change this to adapt specific board*/
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#define I2C_SCL_PIN GPIO_PIN_8
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#define I2C_SCL_PORT GPIOB
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#define I2C_SCL_CLK RCC_APB2_PERIPH_GPIOB
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#define I2C_SDA_PIN GPIO_PIN_9
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#define I2C_SDA_PORT GPIOB
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#define I2C_SDA_CLK RCC_APB2_PERIPH_GPIOB
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struct n32_i2c_bit_data
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{
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struct
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{
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rt_uint32_t clk;
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GPIO_Module* port;
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rt_uint32_t pin;
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}scl, sda;
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};
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static void gpio_set_sda(void *data, rt_int32_t state)
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{
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struct n32_i2c_bit_data* bd = data;
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if (state)
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{
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GPIO_SetBits((GPIO_Module*)bd->sda.port, bd->sda.pin);
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}
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else
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{
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GPIO_ResetBits((GPIO_Module*)bd->sda.port, bd->sda.pin);
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}
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}
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static void gpio_set_scl(void *data, rt_int32_t state)
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{
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struct n32_i2c_bit_data* bd = data;
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if (state)
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{
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GPIO_SetBits((GPIO_Module*)bd->scl.port, bd->scl.pin);
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}
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else
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{
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GPIO_ResetBits((GPIO_Module*)bd->scl.port, bd->scl.pin);
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}
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}
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static rt_int32_t gpio_get_sda(void *data)
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{
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struct n32_i2c_bit_data* bd = data;
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return GPIO_ReadInputDataBit((GPIO_Module*)bd->sda.port, bd->sda.pin);
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}
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static rt_int32_t gpio_get_scl(void *data)
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{
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struct n32_i2c_bit_data* bd = data;
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return GPIO_ReadInputDataBit((GPIO_Module*)bd->scl.port, bd->scl.pin);
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}
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static void gpio_udelay(rt_uint32_t us)
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{
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RCC_ClocksType* RCC_Clocks = {0};
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RCC_GetClocksFreqValue(RCC_Clocks);
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int i = ( RCC_Clocks->SysclkFreq / 4000000 * us);
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while(i)
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{
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i--;
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}
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}
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static void drv_i2c_gpio_init(const struct n32_i2c_bit_data* bd)
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{
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RCC_EnableAPB2PeriphClk(bd->sda.clk | bd->scl.clk, ENABLE);
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GPIOInit((GPIO_Module*)bd->sda.port, GPIO_Mode_Out_OD, GPIO_Speed_10MHz, bd->sda.pin);
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GPIOInit((GPIO_Module*)bd->scl.port, GPIO_Mode_Out_OD, GPIO_Speed_10MHz, bd->scl.pin);
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GPIO_SetBits((GPIO_Module*)bd->sda.port, bd->sda.pin);
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GPIO_SetBits((GPIO_Module*)bd->scl.port, bd->scl.pin);
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}
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#else /* use hardware i2c */
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static uint32_t I2CTimeout = I2CT_LONG_TIMEOUT;
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static int rt_i2c_read(rt_uint32_t i2c_periph, rt_uint16_t slave_address, rt_uint8_t* p_buffer, rt_uint16_t data_byte)
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{
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I2CTimeout = I2CT_LONG_TIMEOUT;
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/* wait until I2C bus is idle */
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while(I2C_GetFlag((I2C_Module*)i2c_periph, I2C_FLAG_BUSY))
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{
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if ((I2CTimeout--) == 0)
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return 9;
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};
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I2C_ConfigAck((I2C_Module*)i2c_periph, ENABLE);
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/** Send START condition */
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I2C_GenerateStart((I2C_Module*)i2c_periph, ENABLE);
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I2CTimeout = I2CT_LONG_TIMEOUT;
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/* wait until SBSEND bit is set */
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while (!I2C_CheckEvent((I2C_Module*)i2c_periph, I2C_EVT_MASTER_MODE_FLAG)) // EV5
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{
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if ((I2CTimeout--) == 0)
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return 10;
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};
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/* send slave address to I2C bus */
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I2C_SendAddr7bit((I2C_Module*)i2c_periph, slave_address, I2C_DIRECTION_RECV);
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I2CTimeout = I2CT_LONG_TIMEOUT;
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while (!I2C_CheckEvent((I2C_Module*)i2c_periph, I2C_EVT_MASTER_RXMODE_FLAG)) // EV6
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{
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if ((I2CTimeout--) == 0)
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return 6;
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};
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// /* clear the ADDSEND bit */
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// I2C_ClrFlag((I2C_Module*)i2c_periph,I2C_FLAG_ADDRF);
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// if(1 == data_byte){
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// /* disable acknowledge */
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// I2C_ConfigAck((I2C_Module*)i2c_periph,DISABLE);
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// /* send a stop condition to I2C bus */
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// I2C_GenerateStop(I2C1, ENABLE);
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// }
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/* while there is data to be read */
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while(data_byte)
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{
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/* wait until the RBNE bit is set and clear it */
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if(I2C_GetFlag((I2C_Module*)i2c_periph, I2C_FLAG_RXDATNE))
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{
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/* read a byte*/
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*p_buffer = I2C_RecvData((I2C_Module*)i2c_periph);
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/* point to the next location where the byte read will be saved */
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p_buffer++;
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/* decrement the read bytes counter */
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data_byte--;
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if(1 == data_byte)
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{
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/* disable acknowledge */
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I2C_ConfigAck((I2C_Module*)i2c_periph, DISABLE);
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/* send a stop condition to I2C bus */
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I2C_GenerateStop((I2C_Module*)i2c_periph, ENABLE);
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}
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}
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}
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/* wait until the stop condition is finished */
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while(I2C_GetFlag((I2C_Module*)i2c_periph, I2C_FLAG_STOPF))
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{
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if ((I2CTimeout--) == 0)
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return 7;
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};
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/* enable acknowledge */
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I2C_ConfigAck((I2C_Module*)i2c_periph, ENABLE);
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I2C_ConfigNackLocation((I2C_Module*)i2c_periph,I2C_NACK_POS_CURRENT);
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return 0;
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}
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static int rt_i2c_write(rt_uint32_t i2c_periph, uint16_t slave_address, uint8_t* p_buffer, uint16_t data_byte)
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{
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uint8_t* sendBufferPtr = p_buffer;
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I2CTimeout = I2CT_LONG_TIMEOUT;
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while (I2C_GetFlag((I2C_Module*)i2c_periph, I2C_FLAG_BUSY))
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{
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if ((I2CTimeout--) == 0)
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return 4;
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};
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I2C_ConfigAck((I2C_Module*)i2c_periph, ENABLE);
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I2C_GenerateStart((I2C_Module*)i2c_periph, ENABLE);
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I2CTimeout = I2CT_LONG_TIMEOUT;
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while (!I2C_CheckEvent((I2C_Module*)i2c_periph, I2C_EVT_MASTER_MODE_FLAG)) // EV5
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{
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if ((I2CTimeout--) == 0)
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return 5;
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};
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I2C_SendAddr7bit((I2C_Module*)i2c_periph, slave_address, I2C_DIRECTION_SEND);
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I2CTimeout = I2CT_LONG_TIMEOUT;
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while (!I2C_CheckEvent((I2C_Module*)i2c_periph, I2C_EVT_MASTER_TXMODE_FLAG)) // EV6
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{
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if ((I2CTimeout--) == 0)
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return 6;
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};
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// send data
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while (data_byte-- > 0)
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{
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I2C_SendData((I2C_Module*)i2c_periph, *sendBufferPtr++);
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I2CTimeout = I2CT_LONG_TIMEOUT;
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while (!I2C_CheckEvent((I2C_Module*)i2c_periph, I2C_EVT_MASTER_DATA_SENDING)) // EV8
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{
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if ((I2CTimeout--) == 0)
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return 7;
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};
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};
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I2CTimeout = I2CT_LONG_TIMEOUT;
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while (!I2C_CheckEvent((I2C_Module*)i2c_periph, I2C_EVT_MASTER_DATA_SENDED)) // EV8-2
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{
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if ((I2CTimeout--) == 0)
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return 8;
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};
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I2C_GenerateStop((I2C_Module*)i2c_periph, ENABLE);
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return 0;
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}
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static rt_size_t rt_i2c_xfer(struct rt_i2c_bus_device *bus, struct rt_i2c_msg msgs[], rt_uint32_t num)
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{
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struct rt_i2c_msg *msg;
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rt_uint32_t i;
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rt_err_t ret = RT_ERROR;
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struct rt_i2c_bus *rt_i2c = (struct rt_i2c_bus *)bus;
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for (i = 0; i < num; i++)
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{
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msg = &msgs[i];
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if (msg->flags & RT_I2C_RD)
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{
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if (rt_i2c_read(rt_i2c->i2c_periph, msg->addr, msg->buf, msg->len) != 0)
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{
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LOG_E("i2c bus write failed,i2c bus stop!");
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goto out;
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}
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}
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else
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{
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if (rt_i2c_write(rt_i2c->i2c_periph, msg->addr, msg->buf, msg->len) != 0)
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{
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LOG_E("i2c bus write failed,i2c bus stop!");
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goto out;
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}
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}
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}
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ret = i;
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return ret;
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out:
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LOG_E("send stop condition\n");
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return ret;
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}
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static const struct rt_i2c_bus_device_ops i2c_ops =
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{
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rt_i2c_xfer,
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RT_NULL,
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RT_NULL
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};
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#endif /* RT_USING_I2C_BITOPS */
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int rt_hw_i2c_init(void)
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{
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#ifdef RT_USING_I2C_BITOPS
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{
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static struct rt_i2c_bus_device i2c_device;
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static const struct n32_i2c_bit_data _i2c_bdata =
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{
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/* SCL */
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{ I2C_SCL_CLK, I2C_SCL_PORT, I2C_SCL_PIN},
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/* SDA */
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{ I2C_SDA_CLK, I2C_SDA_PORT, I2C_SDA_PIN},
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};
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static const struct rt_i2c_bit_ops _i2c_bit_ops =
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{
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(void*)&_i2c_bdata,
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gpio_set_sda,
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gpio_set_scl,
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gpio_get_sda,
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gpio_get_scl,
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gpio_udelay,
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1,
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100
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};
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drv_i2c_gpio_init(&_i2c_bdata);
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i2c_device.priv = (void *)&_i2c_bit_ops;
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rt_i2c_bit_add_bus(&i2c_device, I2C_BUS_NAME);
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}
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#else /* register hardware I2C */
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||
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#ifdef BSP_USING_I2C1
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#define I2C1_SPEED 400000
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static struct rt_i2c_bus i2c_bus1;
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I2C_InitType I2C_InitStructure;
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||
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RCC_EnableAPB2PeriphClk(RCC_APB2_PERIPH_AFIO, ENABLE);
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GPIO_ConfigPinRemap(GPIO_RMP_I2C1, ENABLE);
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/* connect PB8 to I2C1_SCL, PB9 to I2C1_SDA */
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GPIOInit(GPIOB, GPIO_Mode_AF_OD, GPIO_Speed_50MHz, GPIO_PIN_8 | GPIO_PIN_9);
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/* enable I2C clock */
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RCC_EnableAPB1PeriphClk(RCC_APB1_PERIPH_I2C1, ENABLE);
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||
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I2C_DeInit(I2C1);
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I2C_InitStructure.BusMode = I2C_BUSMODE_I2C;
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I2C_InitStructure.FmDutyCycle = I2C_FMDUTYCYCLE_2;
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I2C_InitStructure.OwnAddr1 = 0xff;
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I2C_InitStructure.AckEnable = I2C_ACKEN;
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I2C_InitStructure.AddrMode = I2C_ADDR_MODE_7BIT;
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I2C_InitStructure.ClkSpeed = I2C1_SPEED; // 400000 400K
|
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|
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|
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|
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I2C_Init(I2C1, &I2C_InitStructure);
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||
|
|
|
||
|
|
rt_memset((void *)&i2c_bus1, 0, sizeof(struct rt_i2c_bus));
|
||
|
|
i2c_bus1.parent.ops = &i2c_ops;
|
||
|
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i2c_bus1.i2c_periph = (rt_uint32_t)I2C1;
|
||
|
|
rt_i2c_bus_device_register(&i2c_bus1.parent, "i2c1");
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifdef BSP_USING_I2C2
|
||
|
|
#define I2C2_SPEED 100000
|
||
|
|
|
||
|
|
static struct rt_i2c_bus i2c_bus2;
|
||
|
|
I2C_InitType I2C_InitStructure;
|
||
|
|
|
||
|
|
/* enable I2C clock */
|
||
|
|
RCC_EnableAPB1PeriphClk(RCC_APB1_PERIPH_I2C2, ENABLE);
|
||
|
|
RCC_EnableAPB2PeriphClk(RCC_APB2_PERIPH_AFIO, ENABLE);
|
||
|
|
|
||
|
|
/* connect PB10 to I2C2_SCL, PB11 to I2C2_SDA */
|
||
|
|
GPIOInit(GPIOB, GPIO_Mode_AF_OD, GPIO_Speed_50MHz, GPIO_PIN_10 | GPIO_PIN_11);
|
||
|
|
|
||
|
|
I2C_DeInit(I2C2);
|
||
|
|
I2C_InitStructure.BusMode = I2C_BUSMODE_I2C;
|
||
|
|
I2C_InitStructure.FmDutyCycle = I2C_FMDUTYCYCLE_2;
|
||
|
|
I2C_InitStructure.OwnAddr1 = 0xff;
|
||
|
|
I2C_InitStructure.AckEnable = I2C_ACKEN;
|
||
|
|
I2C_InitStructure.AddrMode = I2C_ADDR_MODE_7BIT;
|
||
|
|
I2C_InitStructure.ClkSpeed = I2C2_SPEED; // 100000 100K
|
||
|
|
|
||
|
|
I2C_Init(I2C2, &I2C_InitStructure);
|
||
|
|
|
||
|
|
rt_memset((void *)&i2c_bus2, 0, sizeof(struct rt_i2c_bus));
|
||
|
|
i2c_bus2.parent.ops = &i2c_ops;
|
||
|
|
i2c_bus2.i2c_periph = (rt_uint32_t)I2C2;
|
||
|
|
rt_i2c_bus_device_register(&i2c_bus2.parent, "i2c2");
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifdef BSP_USING_I2C3
|
||
|
|
#define I2C3_SPEED 100000
|
||
|
|
|
||
|
|
static struct rt_i2c_bus i2c_bus3;
|
||
|
|
I2C_InitType I2C_InitStructure;
|
||
|
|
|
||
|
|
/* enable I2C clock */
|
||
|
|
RCC_EnableAPB2PeriphClk(RCC_APB2_PERIPH_I2C3, ENABLE);
|
||
|
|
RCC_EnableAPB2PeriphClk(RCC_APB2_PERIPH_AFIO, ENABLE);
|
||
|
|
|
||
|
|
/* connect PC0 to I2C3_SCL, PC1 to I2C3_SDA */
|
||
|
|
GPIOInit(GPIOC, GPIO_Mode_AF_OD, GPIO_Speed_50MHz, GPIO_PIN_0 | GPIO_PIN_1);
|
||
|
|
|
||
|
|
I2C_DeInit(I2C3);
|
||
|
|
I2C_InitStructure.BusMode = I2C_BUSMODE_I2C;
|
||
|
|
I2C_InitStructure.FmDutyCycle = I2C_FMDUTYCYCLE_2;
|
||
|
|
I2C_InitStructure.OwnAddr1 = 0xff;
|
||
|
|
I2C_InitStructure.AckEnable = I2C_ACKEN;
|
||
|
|
I2C_InitStructure.AddrMode = I2C_ADDR_MODE_7BIT;
|
||
|
|
I2C_InitStructure.ClkSpeed = I2C3_SPEED; // 100000 100K
|
||
|
|
|
||
|
|
I2C_Init(I2C3, &I2C_InitStructure);
|
||
|
|
|
||
|
|
rt_memset((void *)&i2c_bus3, 0, sizeof(struct rt_i2c_bus));
|
||
|
|
i2c_bus3.parent.ops = &i2c_ops;
|
||
|
|
i2c_bus3.i2c_periph = (rt_uint32_t)I2C3;
|
||
|
|
rt_i2c_bus_device_register(&i2c_bus3.parent, "i2c3");
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifdef BSP_USING_I2C4
|
||
|
|
#define I2C4_SPEED 100000
|
||
|
|
|
||
|
|
static struct rt_i2c_bus i2c_bus4;
|
||
|
|
I2C_InitType I2C_InitStructure;
|
||
|
|
|
||
|
|
/* enable I2C clock */
|
||
|
|
RCC_EnableAPB2PeriphClk(RCC_APB2_PERIPH_I2C4, ENABLE);
|
||
|
|
RCC_EnableAPB2PeriphClk(RCC_APB2_PERIPH_AFIO, ENABLE);
|
||
|
|
|
||
|
|
/* connect PC6 to I2C4_SCL, PC7 to I2C4_SDA */
|
||
|
|
GPIOInit(GPIOC, GPIO_Mode_AF_OD, GPIO_Speed_50MHz, GPIO_PIN_6 | GPIO_PIN_7);
|
||
|
|
|
||
|
|
I2C_DeInit(I2C4);
|
||
|
|
I2C_InitStructure.BusMode = I2C_BUSMODE_I2C;
|
||
|
|
I2C_InitStructure.FmDutyCycle = I2C_FMDUTYCYCLE_2;
|
||
|
|
I2C_InitStructure.OwnAddr1 = 0xff;
|
||
|
|
I2C_InitStructure.AckEnable = I2C_ACKEN;
|
||
|
|
I2C_InitStructure.AddrMode = I2C_ADDR_MODE_7BIT;
|
||
|
|
I2C_InitStructure.ClkSpeed = I2C4_SPEED; // 100000 100K
|
||
|
|
|
||
|
|
I2C_Init(I2C4, &I2C_InitStructure);
|
||
|
|
|
||
|
|
rt_memset((void *)&i2c_bus4, 0, sizeof(struct rt_i2c_bus));
|
||
|
|
i2c_bus4.parent.ops = &i2c_ops;
|
||
|
|
i2c_bus4.i2c_periph = (rt_uint32_t)I2C4;
|
||
|
|
rt_i2c_bus_device_register(&i2c_bus4.parent, "i2c4");
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif /* RT_USING_I2C_BITOPS */
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
INIT_DEVICE_EXPORT(rt_hw_i2c_init);
|
||
|
|
|
||
|
|
#endif
|
||
|
|
/* end of i2c driver */
|