STM32 HAL - 写入 EEPROM (I2C)

STM32 HAL - writing to EEPROM (I2C)

我正在学习 HAL 编程,今天我想将一些数据保存到外部 I2C EEPROM。问题是我发送地址后无法让 EEPROM 发送 ACK。我使用 Arduino(在 5V 和 3V 上)进行了尝试,IC 以 ACK 响应。我尝试连接一个 MLX90614 I2C IR 传感器并且它工作正常(我得到了响应并且我可以在 Arduino 和 STM32 中发送和接收数据)。我还交换了 SDA 和 SCL 引线,以为我可能将它们混在一起了,但事实并非如此。我使用了逻辑分析仪,如您所见,我只得到了一个 NACK。我不认为 EEPROM IC(ATMLU036/2EB - AT24C256B)不喜欢 3V,因为它在 Arduino 中工作,数据表说即使在较低电压下它也能正常工作。我不知道为什么它不工作以及为什么其他 I2C 外围设备(例如红外传感器)工作得很好。我正在使用 STM32F429ZI - DISC1。这是我的代码:(简而言之,我将引脚 PB8 用于 SCL,将 PB9 用于 SDA,我尝试了 100kHz、10kHz、1kHz scl 频率,但没有帮助。在 STM32CubeMX 中,我没有改变任何东西——线路有内部拉力向上电阻)

/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "stm32f4xx_hal.h"

/* USER CODE BEGIN Includes */

/* USER CODE END Includes */

/* Private variables ---------------------------------------------------------*/
I2C_HandleTypeDef hi2c1;

/* 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);

/* USER CODE BEGIN PFP */
/* Private function prototypes -----------------------------------------------*/

/* USER CODE END PFP */

/* USER CODE BEGIN 0 */

/* USER CODE END 0 */

/**
  * @brief  The application entry point.
  *
  * @retval None
  */
int main(void)
{
  /* USER CODE BEGIN 1 */

  /* 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();
  /* USER CODE BEGIN 2 */
  uint8_t d = 0xfc;

  HAL_I2C_Mem_Write( &hi2c1, (0b1010000 << 1), 0x00, I2C_MEMADD_SIZE_8BIT, &d, I2C_MEMADD_SIZE_8BIT, 1000 );

  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1){

  /* USER CODE END WHILE */

  /* USER CODE BEGIN 3 */

  }
  /* USER CODE END 3 */

}

/**
  * @brief System Clock Configuration
  * @retval None
  */
void SystemClock_Config(void)
{

  RCC_OscInitTypeDef RCC_OscInitStruct;
  RCC_ClkInitTypeDef RCC_ClkInitStruct;

    /**Configure the main internal regulator output voltage 
    */
  __HAL_RCC_PWR_CLK_ENABLE();

  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE3);

    /**Initializes the CPU, AHB and APB busses clocks 
    */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.HSICalibrationValue = 16;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }

    /**Initializes the CPU, AHB and APB busses clocks 
    */
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                              |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }

    /**Configure the Systick interrupt time 
    */
  HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq()/1000);

    /**Configure the Systick 
    */
  HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK);

  /* SysTick_IRQn interrupt configuration */
  HAL_NVIC_SetPriority(SysTick_IRQn, 0, 0);
}

/* I2C1 init function */
static void MX_I2C1_Init(void)
{

  hi2c1.Instance = I2C1;
  hi2c1.Init.ClockSpeed = 10000;
  hi2c1.Init.DutyCycle = I2C_DUTYCYCLE_2;
  hi2c1.Init.OwnAddress1 = 0;
  hi2c1.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
  hi2c1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
  hi2c1.Init.OwnAddress2 = 0;
  hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
  hi2c1.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
  if (HAL_I2C_Init(&hi2c1) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }

}

/** Pinout Configuration
*/
static void MX_GPIO_Init(void)
{

  /* GPIO Ports Clock Enable */
  __HAL_RCC_GPIOB_CLK_ENABLE();

}

/* USER CODE BEGIN 4 */

/* USER CODE END 4 */

/**
  * @brief  This function is executed in case of error occurrence.
  * @param  file: The file name as string.
  * @param  line: The line in file as a number.
  * @retval None
  */
void _Error_Handler(char *file, int line)
{
  /* USER CODE BEGIN Error_Handler_Debug */
  /* User can add his own implementation to report the HAL error return state */
  while(1)
  {
  }
  /* USER CODE END Error_Handler_Debug */
}

#ifdef  USE_FULL_ASSERT
/**
  * @brief  Reports the name of the source file and the source line number
  *         where the assert_param error has occurred.
  * @param  file: pointer to the source file name
  * @param  line: assert_param error line source number
  * @retval None
  */
void assert_failed(uint8_t* file, uint32_t line)
{ 
  /* USER CODE BEGIN 6 */
  /* User can add his own implementation to report the file name and line number,
     tex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
  /* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */

/**
  * @}
  */

/**
  * @}
  */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

我在某处读到,这可能是由于 IC 写了一些东西引起的,但在我的示例中不是。我只是想让设备回答,我没有向 EEPROM 单元写入任何内容。我还编写了一个简单的 I2C 地址扫描器(用于 STM32,我尝试了一个 Arduino I2C 地址扫描器),这是同一个故事:IR 传感器以 ACK 响应(在地址 0x5A 上)并且 EEPROM 在每个可能的 7 位地址上以 NACK 响应: \(同样在 0x50 上,A0、A1、A2 地址引脚连接到 GND,我也尝试使用外部上拉电阻,但正如您猜到的那样,它没有用)。请帮助我或提示我为什么此设置不起作用。 I2C data transmission

抱歉我的语法错误,我还在学习英语。

我想我找到了答案。问题是:(鼓声)巨大的电容。我将 SDA 和 SCL 插入我的示波器和 I saw this. Then I unplugged SDA and SCL cables from my breadboard and inserted them directly into oscilloscope. (Some buses are low at start, because I restarted STM32). After this I added 1K pull-up resistors (instead of the built into STM32 and (in testing) external 10K) and got this nice data transmission. Next I confirmed that everything works using PulseView。感谢所有阅读过我的问题并花一些时间修改为什么这不起作用的人。我猜想 MLX90614esf 对大电容不太敏感(或者它的内部电阻值较低 pull-up)。