2019年08月29日 | STM32F429 >> 12. I²C 通讯（Code）

硬件I²C

在此我们使用硬件I²C 通讯，即使用I²C 外设帮助我们控制数据的发送和时钟的规律跳变。

若是使用模拟I²C 即是51 风格的编程，用程序手动控制两根总线的数据和时钟变化。

编程指南

初始化I²C GPIO引脚；

初始化I²C；

根据事件相应顺序编写相应的读/写操作程序；

编写页写入程序；（非必要）

编写缓冲区buffer 写入程序。（非必要）

bsp_i2c.h

/**

  ******************************************************************************

  * @file    bsp_i2c.h

  * @author  Waao

  * @version V1.0.0

  * @date    15-Jan-2019

  * @brief   This file contains some board support package's functions for the configuration of the I2C.

  *            

  ******************************************************************************

  * @attention

  *

  * None

*

  ******************************************************************************

  */

#ifndef _BSP_I2C_H_

#define _BSP_I2C_H_

#include

#include

#include

#include

//=========================== I2C ==================================

#define I2C_SCL_GPIO_PORT       GPIOB

#define I2C_SCL_GPIO_PIN        GPIO_Pin_6

#define I2C_SCL_GPIO_PINSOURCE  GPIO_PinSource6

#define I2C_SCL_GPIO_AF         GPIO_AF_I2C1

#define I2C_SCL_GPIO_CLK        RCC_AHB1Periph_GPIOB //AHB1

#define I2C_SDA_GPIO_PORT       GPIOB

#define I2C_SDA_GPIO_PIN        GPIO_Pin_7

#define I2C_SDA_GPIO_PINSOURCE  GPIO_PinSource7

#define I2C_SDA_GPIO_AF         GPIO_AF_I2C1

#define I2C_SDA_GPIO_CLK        RCC_AHB1Periph_GPIOB //AHB1

#define I2C_                    I2C1

#define I2C_CLK                 RCC_APB1Periph_I2C1 //APB1

#define I2C_SPEED               400000

#define I2C_OWN_ADDRESS         0X01 /*This address just need to be differenent with the address of 

                                       the device which communicated with the master.*/

//========================== EEPROM ==================================

#define EEPROM_SCL_GPIO_PORT    GPIOB

#define EEPROM_SCL_GPIO_PIN     GPIO_Pin_6

#define EEPROM_SDA_GPIO_PORT    GPIOB

#define EEPROM_SDA_GPIO_PIN     GPIO_Pin_7

#define EEPROM_W_ADDRESS        0XA0  

#define EEPROM_R_ADDRESS        0XA1

#define TIMEOUT                 (uint32_t)(0X1000)

#define LONG_TIMEOUT            (uint32_t)(10*TIMEOUT)

#define I2C_PageSize            8

void I2C_FINAL_Config(void);

void I2C_EE_WaitEepromStandByState(void);

uint32_t I2C_TRANSMIT_Byte(u8 WriteAddr, u8* data);

uint8_t I2C_EE_PageWrite(uint8_t* pBuffer, uint8_t WriteAddr, uint8_t NumByteToWrite);

void I2C_BufferWrite(u8* pBuffer, u8 WriteAddr, u16 NumByteToWrite);

uint32_t I2C_BufferRead(u8* pBuffer, u8 ReadAddr, u16 NumByteToRead);

#endif

bsp_i2c.c

/**

  ******************************************************************************

  * @file    bsp_i2c.c

  * @author  Waao

  * @version V1.0.0

  * @date    15-Jan-2019

  * @brief   This file contains some board support package's functions for the configuration of the I2C.

  *            

  ******************************************************************************

  * @attention

  *

  * None

*

  ******************************************************************************

  */

#include

uint32_t timeout;

/**

  * @brief  Configure the I2C_GPIO

  * @param  None

  * @retval None

  */

void I2C_GPIO_Config(void)

{

GPIO_InitTypeDef GPIO_InitStructure;

RCC_AHB1PeriphClockCmd(I2C_SCL_GPIO_CLK, ENABLE);

RCC_AHB1PeriphClockCmd(I2C_SDA_GPIO_CLK, ENABLE);

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;

GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;

GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_25MHz;

GPIO_InitStructure.GPIO_Pin = I2C_SCL_GPIO_PIN;

GPIO_Init(I2C_SCL_GPIO_PORT, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = I2C_SCL_GPIO_PIN;

GPIO_Init(I2C_SCL_GPIO_PORT, &GPIO_InitStructure);

GPIO_PinAFConfig(I2C_SCL_GPIO_PORT, I2C_SCL_GPIO_PINSOURCE, I2C_SCL_GPIO_AF);

GPIO_InitStructure.GPIO_Pin = I2C_SDA_GPIO_PIN;

GPIO_Init(I2C_SDA_GPIO_PORT, &GPIO_InitStructure);

GPIO_PinAFConfig(I2C_SDA_GPIO_PORT, I2C_SDA_GPIO_PINSOURCE, I2C_SDA_GPIO_AF);

}

/**

  * @brief  Configure the I2C

  * @param  None

  * @retval None

  */

void I2C_Config(void)

{

I2C_InitTypeDef I2C_InitStructure;

RCC_APB1PeriphClockCmd(I2C_CLK, ENABLE);

I2C_InitStructure.I2C_ClockSpeed = I2C_SPEED;

I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;

I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;

I2C_InitStructure.I2C_OwnAddress1 = I2C_OWN_ADDRESS;

I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;

I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;

I2C_Init(I2C_, &I2C_InitStructure);

I2C_Cmd(I2C_, ENABLE);

}

/**

  * @brief  Configure the I2C and I2C_GPIO

  * @param  None

  * @retval None

  */

void I2C_FINAL_Config(void)

{

I2C_GPIO_Config();

I2C_Config();

}

/**

* @brief  Error prompt function: When the program meet a error, this function will tell you the error code.

  * @param  None

* @retval None

  */

uint32_t TIME_OUT_CallBack(u8 STATE)

{

printf("The program has error, the error code is %dn", STATE);

return 0;

}

/**

  * @brief  Waiting the EEPROM to be ready.

  * @param  None

  * @retval None

  */

void I2C_EE_WaitEepromStandByState(void)

{

uint16_t SR1_tmp = 0;

do

{

I2C_GenerateSTART(I2C_, ENABLE);

SR1_tmp = I2C_ReadRegister(I2C_, I2C_Register_SR1);

I2C_Send7bitAddress(I2C_, EEPROM_W_ADDRESS, I2C_Direction_Transmitter);

}

while(!(I2C_ReadRegister(I2C_, I2C_Register_SR1) & 0x0002));

I2C_ClearFlag(I2C_, I2C_FLAG_AF);

I2C_GenerateSTOP(I2C_, ENABLE);

}

/**

  * @brief  Transmit a Byte to EEPROM through the I2C peripherals.

  * @param  data: The data you want to transmit.

  * @retval None

  */

uint32_t I2C_TRANSMIT_Byte(u8 WriteAddr, u8* data)

{

I2C_GenerateSTART(I2C_, ENABLE);

timeout = TIMEOUT;

while(!I2C_CheckEvent(I2C_, I2C_EVENT_MASTER_MODE_SELECT)) //EV5

{

timeout--;

if(timeout == 0)

return TIME_OUT_CallBack(0);

}

//Transmit the address which the EEPROM has.

I2C_Send7bitAddress(I2C_, EEPROM_W_ADDRESS, I2C_Direction_Transmitter);

timeout = TIMEOUT;

while(!I2C_CheckEvent(I2C_, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)) //EV6_TRANSMITTER

{

timeout--;

if(timeout == 0)

return TIME_OUT_CallBack(1);

}

//Transmit the internal address with the ROM of the EEPROM

I2C_SendData(I2C_, WriteAddr);

timeout = TIMEOUT;

while(!I2C_CheckEvent(I2C_, I2C_EVENT_MASTER_BYTE_TRANSMITTING)) //EV8_TRANSMITTING

{

timeout--;

if(timeout == 0)

return TIME_OUT_CallBack(2);

}

//Transmit the real data

I2C_SendData(I2C_, *data);

timeout = TIMEOUT;

while(!I2C_CheckEvent(I2C_, I2C_EVENT_MASTER_BYTE_TRANSMITTING)) //EV8_TRANSMITTING

{

timeout--;

if(timeout == 0)

return TIME_OUT_CallBack(3);

}

I2C_GenerateSTOP(I2C_, ENABLE);

printf("Transmit successfully!"); 

return 1;

}

/**

  * @brief  Transmit a page of data to EEPROM through the I2C 

  * @param  pBuffer: The pointer of the buffer.

* WriteAddr: Write address.

* NumByteToWrite: The number of bytes what we write.

  * @retval None

  */

uint8_t I2C_EE_PageWrite(uint8_t* pBuffer, uint8_t WriteAddr, uint8_t NumByteToWrite)

{

timeout = LONG_TIMEOUT;

//Check whether the I2C bus is busy or not

while(I2C_GetFlagStatus(I2C_, I2C_FLAG_BUSY))

{

timeout--;

if(timeout-- == 0)

return TIME_OUT_CallBack(8);

}

I2C_GenerateSTART(I2C_, ENABLE);

timeout = TIMEOUT;

while(!I2C_CheckEvent(I2C_, I2C_EVENT_MASTER_MODE_SELECT)) //EV5

{

timeout--;

if(timeout == 0)

return TIME_OUT_CallBack(9);

}

I2C_Send7bitAddress(I2C_, EEPROM_W_ADDRESS, I2C_Direction_Transmitter);

timeout = TIMEOUT;

while(!(I2C_CheckEvent(I2C_, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED))) //EV6_TRANSMISTTING

{

timeout--;

if(timeout == 0)

return TIME_OUT_CallBack(10);

}

I2C_SendData(I2C_, WriteAddr);

timeout = TIMEOUT;

while(!(I2C_CheckEvent(I2C_, I2C_EVENT_MASTER_BYTE_TRANSMITTED))) //EV8_2

{

timeout--;

if(timeout == 0)

return TIME_OUT_CallBack(11);

}

for(;NumByteToWrite>0;NumByteToWrite--)

{

I2C_SendData(I2C_, *pBuffer);

pBuffer++;

timeout = TIMEOUT;

while(!(I2C_CheckEvent(I2C_, I2C_EVENT_MASTER_BYTE_TRANSMITTED))) //EV8_2

{

timeout--;

if(timeout == 0)

return TIME_OUT_CallBack(12);

}

}

I2C_GenerateSTOP(I2C_, ENABLE);

return 1;

}

/**

  * @brief  Transmit the data to EEPROM from the buffer

  * @param  pBuffer: The pointer of the buffer.

* WriteAddr: Write address.

* NumByteToWrite: The number of bytes what we write.

  * @retval None

  */

void I2C_BufferWrite(u8* pBuffer, u8 WriteAddr, u16 NumByteToWrite)

{

u8 NumOfPage = 0, NumOfSingle = 0, Addr = 0, count = 0;

//One page can full with 8 bytes data utmostly

Addr = WriteAddr % I2C_PageSize;

count = I2C_PageSize - Addr;

NumOfPage = NumByteToWrite / I2C_PageSize;

NumOfSingle = NumByteToWrite % I2C_PageSize;

//We can write the data directly to a new page

if(Addr == 0)

{

//The data can't make full of a page

if(NumOfPage == 0)

{

I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle);

I2C_EE_WaitEepromStandByState();

}

else

{

//We should make full of the whole page one by one

while(NumOfPage--)

{

I2C_EE_PageWrite(pBuffer, WriteAddr, I2C_PageSize);

I2C_EE_WaitEepromStandByState();