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程序设计案例

stm32的I2C配置为主模式，通过I2C总线向EEPROM指定存储器地址写入数据，再通过I2C向EEPROM指定存储器地址读出数据，比较写入和读出的数据是否不一致，将结果通过串口打印出来。

main.c

int main(void){ HAL_Init();  /* 配置系统时钟为168 MHz */  SystemClock_Config(); /* 初始化RGB彩灯 */  LED_GPIO_Config();  /*初始化USART 配置模式为 115200 8-N-1，中断接收*/ DEBUG_USART_Config();  printf("\r\n 这是一个I2C外设(AT24C02)读写测试例程 \r\n");  /* I2C 外设初(AT24C02)始化 */ I2C_EE_Init();  if(I2C_Test() ==1) { LED_GREEN; } else { LED_RED; }  while (1) {  } }

bsp_i2c_ee.c

void HAL_I2C_MspInit(I2C_HandleTypeDef *hi2c){  GPIO_InitTypeDef  GPIO_InitStruct;  /*##-1- Enable peripherals and GPIO Clocks #################################*/ /* Enable GPIO TX/RX clock */ I2Cx_SCL_GPIO_CLK_ENABLE(); I2Cx_SDA_GPIO_CLK_ENABLE(); /* Enable I2C1 clock */ I2Cx_CLK_ENABLE();   /*##-2- Configure peripheral GPIO ##########################################*/  /* I2C TX GPIO pin configuration  */ GPIO_InitStruct.Pin = I2Cx_SCL_PIN; GPIO_InitStruct.Mode = GPIO_MODE_AF_OD; GPIO_InitStruct.Pull = GPIO_NOPULL; GPIO_InitStruct.Speed = GPIO_SPEED_FAST; GPIO_InitStruct.Alternate = I2Cx_SCL_AF;  HAL_GPIO_Init(I2Cx_SCL_GPIO_PORT, &GPIO_InitStruct);  /* I2C RX GPIO pin configuration  */ GPIO_InitStruct.Pin = I2Cx_SDA_PIN; GPIO_InitStruct.Alternate = I2Cx_SDA_AF;  HAL_GPIO_Init(I2Cx_SDA_GPIO_PORT, &GPIO_InitStruct);  /* Force the I2C peripheral clock reset */  I2Cx_FORCE_RESET() ;   /* Release the I2C peripheral clock reset */  I2Cx_RELEASE_RESET(); }  /** * @brief I2C 工作模式配置 * @param 无 * @retval 无 */static void I2C_Mode_Config(void){  I2C_Handle.Instance = I2Cx;  I2C_Handle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT; I2C_Handle.Init.ClockSpeed = 400000; I2C_Handle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE; I2C_Handle.Init.DutyCycle = I2C_DUTYCYCLE_2; I2C_Handle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE; I2C_Handle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE; I2C_Handle.Init.OwnAddress1 = I2C_OWN_ADDRESS7 ; I2C_Handle.Init.OwnAddress2 = 0;  /* Init the I2C */ HAL_I2C_Init(&I2C_Handle);  //  HAL_I2CEx_AnalogFilter_Config(&I2C_Handle, ENABLE); } /** * @brief I2C 外设(EEPROM)初始化 * @param 无 * @retval 无 */void I2C_EE_Init(void){ I2C_Mode_Config(); } /** * @brief 将缓冲区中的数据写到I2C EEPROM中 * @param  * @arg pBuffer:缓冲区指针 * @arg WriteAddr:写地址 * @arg NumByteToWrite:写的字节数 * @retval 无 */void I2C_EE_BufferWrite(uint8_t* pBuffer, uint8_t WriteAddr, uint16_t NumByteToWrite){ uint8_t NumOfPage = 0, NumOfSingle = 0, Addr = 0, count = 0;  Addr = WriteAddr % EEPROM_PAGESIZE; count = EEPROM_PAGESIZE - Addr; NumOfPage = NumByteToWrite / EEPROM_PAGESIZE; NumOfSingle = NumByteToWrite % EEPROM_PAGESIZE;  /* If WriteAddr is I2C_PageSize aligned  */ if(Addr == 0)  { /* If NumByteToWrite < I2C_PageSize */ if(NumOfPage == 0)  { I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle); } /* If NumByteToWrite > I2C_PageSize */ else  { while(NumOfPage--) { I2C_EE_PageWrite(pBuffer, WriteAddr, EEPROM_PAGESIZE);  WriteAddr += EEPROM_PAGESIZE; pBuffer += EEPROM_PAGESIZE; }  if(NumOfSingle!=0) { I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle); } } } /* If WriteAddr is not I2C_PageSize aligned  */ else  { /* If NumByteToWrite < I2C_PageSize */ if(NumOfPage== 0)  { I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle); } /* If NumByteToWrite > I2C_PageSize */ else { NumByteToWrite -= count; NumOfPage = NumByteToWrite / EEPROM_PAGESIZE; NumOfSingle = NumByteToWrite % EEPROM_PAGESIZE;   if(count != 0) {  I2C_EE_PageWrite(pBuffer, WriteAddr, count); WriteAddr += count; pBuffer += count; }   while(NumOfPage--) { I2C_EE_PageWrite(pBuffer, WriteAddr, EEPROM_PAGESIZE); WriteAddr += EEPROM_PAGESIZE; pBuffer += EEPROM_PAGESIZE;  } if(NumOfSingle != 0) { I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle);  } } } } /** * @brief 写一个字节到I2C EEPROM中 * @param  * @arg pBuffer:缓冲区指针 * @arg WriteAddr:写地址  * @retval 无 */uint32_t I2C_EE_ByteWrite(uint8_t* pBuffer, uint8_t WriteAddr){ HAL_StatusTypeDef status = HAL_OK;  status = HAL_I2C_Mem_Write(&I2C_Handle, EEPROM_ADDRESS, (uint16_t)WriteAddr, I2C_MEMADD_SIZE_8BIT, pBuffer, 1, 100);   /* Check the communication status */ if(status != HAL_OK) { /* Execute user timeout callback */ //I2Cx_Error(Addr); } while (HAL_I2C_GetState(&I2C_Handle) != HAL_I2C_STATE_READY) {  }  /* Check if the EEPROM is ready for a new operation */ while (HAL_I2C_IsDeviceReady(&I2C_Handle, EEPROM_ADDRESS, EEPROM_MAX_TRIALS, I2Cx_TIMEOUT_MAX) == HAL_TIMEOUT);  /* Wait for the end of the transfer */ while (HAL_I2C_GetState(&I2C_Handle) != HAL_I2C_STATE_READY) {  } return status;} /** * @brief 在EEPROM的一个写循环中可以写多个字节，但一次写入的字节数 *          不能超过EEPROM页的大小，AT24C02每页有8个字节 * @param  * @arg pBuffer:缓冲区指针 * @arg WriteAddr:写地址 * @arg NumByteToWrite:写的字节数 * @retval 无 */uint32_t I2C_EE_PageWrite(uint8_t* pBuffer, uint8_t WriteAddr, uint8_t NumByteToWrite){ HAL_StatusTypeDef status = HAL_OK; /* Write EEPROM_PAGESIZE */ status=HAL_I2C_Mem_Write(&I2C_Handle, EEPROM_ADDRESS,WriteAddr, I2C_MEMADD_SIZE_8BIT, (uint8_t*)(pBuffer),NumByteToWrite, 100);  while (HAL_I2C_GetState(&I2C_Handle) != HAL_I2C_STATE_READY) {  }  /* Check if the EEPROM is ready for a new operation */ while (HAL_I2C_IsDeviceReady(&I2C_Handle, EEPROM_ADDRESS, EEPROM_MAX_TRIALS, I2Cx_TIMEOUT_MAX) == HAL_TIMEOUT);  /* Wait for the end of the transfer */ while (HAL_I2C_GetState(&I2C_Handle) != HAL_I2C_STATE_READY) {  } return status;} /** * @brief 从EEPROM里面读取一块数据  * @param  * @arg pBuffer:存放从EEPROM读取的数据的缓冲区指针 * @arg WriteAddr:接收数据的EEPROM的地址 * @arg NumByteToWrite:要从EEPROM读取的字节数 * @retval 无 */uint32_t I2C_EE_BufferRead(uint8_t* pBuffer, uint8_t ReadAddr, uint16_t NumByteToRead){ HAL_StatusTypeDef status = HAL_OK;  status=HAL_I2C_Mem_Read(&I2C_Handle,EEPROM_ADDRESS,ReadAddr, I2C_MEMADD_SIZE_8BIT, (uint8_t *)pBuffer, NumByteToRead,1000);  return status;}

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实验结果