如何使用STM32CUBE HAL库进行连续的i2c读取

Question

我正在使用实际的HAL库通过stm32f407发现板来读写AD7998模数转换器。如果我想从转换结果寄存器中读取几个寄存器值，该手册说应该保持SCL和SDA信号，并且我不能发送停止位。AD7998 signal pattern to read several register values of one register。

我尝试使用Mem_Read。这似乎适用于一个2字节的寄存器。但是现在我不确定如何访问转换结果寄存器的其他部分以读取比第一个通道更多的内容。如有必要，您可以在此处找到手册-> AD7998 manual，以及下面的我的代码。

我试图增加要读取的字节数，但随后将第一个通道的值写入其他字节。你们中有人尝试过吗？

/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "i2c.h"
#include "i2s.h"
#include "tim.h"
#include "usb_device.h"
#include "gpio.h"

/* USER CODE BEGIN PV */
uint16_t DeviceAdress= 0x20 << 1;
/* USER CODE END PV */

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 */
  HAL_StatusTypeDef stat = 0;
  uint8_t adcTxBuffer[16];
  uint8_t adcRxBuffer[16];
  /* 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_I2S3_Init();
  MX_SPI1_Init();
  MX_USB_DEVICE_Init();
  MX_TIM14_Init();
  /* USER CODE BEGIN 2 */

  adcTxBuffer[0] = 0x00;
  adcTxBuffer[1] = 0xF8;                                                          // setup 4 channels (0, 1, 2, 3)
  stat = HAL_I2C_Mem_Write(&hi2c1, DeviceAdress, 0x02, 2, adcTxBuffer, 2, 100);   //access the configuration register
  stat = HAL_I2C_Mem_Read(&hi2c1, DeviceAdress, 0x02, 2, adcRxBuffer, 2, 100);    // read vlaue from Configuration Register 
 HAL_GPIO_TogglePin(GPIOA, 1);                                                   // start up adc
  HAL_Delay(1);                                                                  // delay for adc power up
  HAL_GPIO_TogglePin(GPIOA, 1);                                                  // delay for sampling complete
  HAL_Delay(1);                                                                  // delay for sampling complete

  stat = HAL_I2C_Mem_Read(&hi2c1, DeviceAdress, 0x00, 2, adcRxBuffer, 16, 100);  // read conversion result register

  /* 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 = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
  RCC_PeriphCLKInitTypeDef PeriphClkInitStruct = {0};

  /** Configure the main internal regulator output voltage 
  */
  __HAL_RCC_PWR_CLK_ENABLE();
  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
  /** Initializes the CPU, AHB and APB busses clocks 
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
  RCC_OscInitStruct.PLL.PLLM = 8;
  RCC_OscInitStruct.PLL.PLLN = 336;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
  RCC_OscInitStruct.PLL.PLLQ = 7;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }
  /** 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_PLLCLK;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK)
  {
    Error_Handler();
  }
  PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_I2S;
  PeriphClkInitStruct.PLLI2S.PLLI2SN = 192;
  PeriphClkInitStruct.PLLI2S.PLLI2SR = 2;
  if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK)
  {
    Error_Handler();
  }
}

/* USER CODE BEGIN 4 */

/* USER CODE END 4 */

/**
  * @brief  This function is executed in case of error occurrence.
  * @retval None
  */
void Error_Handler(void)
{
  /* USER CODE BEGIN Error_Handler_Debug */
  /* User can add his own implementation to report the HAL error return state */

  /* 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****/

Answer 1

通过在每次迭代中配置我的寄存器，找到了一种读取数据的替代方法。现在可以正常工作。