29.[stm32f103][hal] i2c_AT2402 eeprom

0. 파일

user_I2c.c

1. STM32Cube

I2c 를 사용하려면 

2가지 방법이 있습니다.

첫번째는 GPIO를 사용하여 직접 제어 는

장점 - Pull up 저항 안달아도됨

         직관적인 제어

두번째는 내부 함수를 사용해서 제어하는 방법입니다.

근데 하다보니 Clock Configuration 에서 2Mhz 이상 설정하면 I2C가 안되는 문제가 있는거 같습니다.

그래서 위에 Cube 설정에서 2Mhz 로 맞춘 이유가 그것입니다.

2. 소스

user_I2c.c

#include "stm32f1xx_hal.h" int at24_HAL_WriteBytes(I2C_HandleTypeDef *hi2c,uint16_t DevAddress,uint16_t MemAddress, uint8_t *pData,uint16_t TxBufferSize) {          printf("Write");           /* * program just get the DevAddress of the Slave (not master) and for the next step * You know that the most of the EEprom address start with 0xA0 * give MemAddress for the location you want to write to * give Data buffer so it can write Data on this location */ //Note that this function works properly to 31 bytes if(MemAddress+TxBufferSize > 16) { //Write to 16bytes while(HAL_I2C_Mem_Write(hi2c,(uint16_t)DevAddress,(uint16_t)MemAddress,I2C_MEMADD_SIZE_8BIT,pData,(uint16_t)16-MemAddress,1000)!= HAL_OK); //write remaining bytes *pData = *pData + (16-MemAddress); while(HAL_I2C_Mem_Write(hi2c,(uint16_t)DevAddress,(uint16_t)16,I2C_MEMADD_SIZE_8BIT,pData,(uint16_t)((MemAddress+TxBufferSize)-16),1000)!= HAL_OK); } else { while( (TxBufferSize-16)>0 ) { //if your data is more than 16 bytes,you are here while(HAL_I2C_Mem_Write(hi2c,(uint16_t)DevAddress,(uint16_t)MemAddress,I2C_MEMADD_SIZE_8BIT,pData,(uint16_t)16,1000)!= HAL_OK); TxBufferSize-=16; pData+=16; MemAddress+=16; } //remaining data while(HAL_I2C_Mem_Write(hi2c,(uint16_t)DevAddress,(uint16_t)MemAddress,I2C_MEMADD_SIZE_8BIT,pData,(uint16_t)TxBufferSize,1000)!= HAL_OK); } return 1; } int at24_HAL_ReadBytes(I2C_HandleTypeDef *hi2c,uint16_t DevAddress,uint16_t MemAddress, uint8_t *pData,uint16_t RxBufferSize) { int TimeOut;         printf("Read");  /* * program just get the DevAddress of the Slave (not master) and for the next step * You know that the most of the EEprom address start with 0xA0 * get the MemAddress for the location you want to write data on it * get the Data buffer so it can write Data on this location */ //Note that this function works properly to 31bytes while( (RxBufferSize-16)>0 ) { //if your data is more than 16 bytes,you are here TimeOut = 0; while(HAL_I2C_Mem_Read(hi2c,(uint16_t)DevAddress,(uint16_t)MemAddress,I2C_MEMADD_SIZE_8BIT,pData,(uint16_t)16,1000)!= HAL_OK && TimeOut < 10) { TimeOut++; } RxBufferSize-=16; pData+=16; MemAddress+=16; } // //remaining data TimeOut = 0; while(HAL_I2C_Mem_Read(hi2c,(uint16_t)DevAddress,(uint16_t)MemAddress,I2C_MEMADD_SIZE_8BIT,pData,(uint16_t)RxBufferSize,1000)!= HAL_OK && TimeOut < 10) { TimeOut++; } return 1; }

main.c

#include "main.h" #include "stm32f1xx_hal.h" /* USER CODE BEGIN Includes */ /* USER CODE END Includes */ /* Private variables ---------------------------------------------------------*/ I2C_HandleTypeDef hi2c1; UART_HandleTypeDef huart1; /* USER CODE BEGIN PV */ /* Private variables ---------------------------------------------------------*/ /* USER CODE END PV */ /* Private function prototypes -----------------------------------------------*/ void SystemClock_Config(void); static void MX_GPIO_Init(void); static void MX_I2C1_Init(void); static void MX_USART1_UART_Init(void); /* USER CODE BEGIN PFP */ /* Private function prototypes -----------------------------------------------*/ /* USER CODE END PFP */ /* USER CODE BEGIN 0 */ int fputc(int ch, FILE *f) {     uint8_t temp[1]={ch};     HAL_UART_Transmit(&huart1, temp, 1, 2);   return(ch); } /* USER CODE END 0 */ /**   * @brief  The application entry point.   *   * @retval None   */ int main(void) {   /* USER CODE BEGIN 1 */   uint8_t d[1]={0x04};     uint8_t c[1]={0x00};   uint8_t e[1]={0x00};   /* USER CODE END 1 */   /* MCU Configuration----------------------------------------------------------*/   /* Reset of all peripherals, Initializes the Flash interface and the Systick. */   HAL_Init();   /* USER CODE BEGIN Init */   /* USER CODE END Init */   /* Configure the system clock */   SystemClock_Config();   /* USER CODE BEGIN SysInit */   /* USER CODE END SysInit */   /* Initialize all configured peripherals */   MX_GPIO_Init();   MX_I2C1_Init();   MX_USART1_UART_Init();   /* USER CODE BEGIN 2 */   printf("test\r\n");   /* USER CODE END 2 */   /* Infinite loop */   /* USER CODE BEGIN WHILE */      HAL_Delay(100);   at24_HAL_WriteBytes(&hi2c1, 0xA0, 0, d, 1);   HAL_Delay(500);   at24_HAL_ReadBytes(&hi2c1, 0xA0, 0, c, 1);   HAL_Delay(500);   printf("%d\r\n",c[0]);   at24_HAL_WriteBytes(&hi2c1, 0xA0, 0, e, 1);   HAL_Delay(500);   at24_HAL_ReadBytes(&hi2c1, 0xA0, 0, c, 1);   HAL_Delay(500);   printf("clear %d\r\n",c[0]);      while (1)   {   /* USER CODE END WHILE */   /* USER CODE BEGIN 3 */   }   /* USER CODE END 3 */ }