Unable to wake up the STM32CO from the stop mode by using the I2C.

[ttcoder]

Hi,

I have made the STM32C0 an I2C slave, and I want to wake up the STM32C0 from the stop mode by using the I2C. I have tried with the below configurations, but STM32C0 won't wake up when any I2C events occur. When the device is in running mode, I2C works fine. 

I2C_config(){

hi2c1.Instance = I2C1;

hi2c1.Init.Timing = 0x40000A0B;

hi2c1.Init.OwnAddress1 = 64;

hi2c1.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;

hi2c1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;

hi2c1.Init.OwnAddress2 = 0;

hi2c1.Init.OwnAddress2Masks = I2C_OA2_NOMASK;

hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;

hi2c1.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;

if (HAL_I2C_Init(&hi2c1) != HAL_OK) {

Error_Handler();

}

/** Configure Analogue filter

*/

if (HAL_I2CEx_ConfigAnalogFilter(&hi2c1, I2C_ANALOGFILTER_ENABLE)

!= HAL_OK) {

Error_Handler();

}

/** Configure Digital filter

*/

if (HAL_I2CEx_ConfigDigitalFilter(&hi2c1, 0) != HAL_OK) {

Error_Handler();

}

/* USER CODE BEGIN I2C1_Init 2 */

// Enable and set I2C interrupt priority

HAL_NVIC_SetPriority(I2C1_IRQn, 0, 0);

HAL_NVIC_EnableIRQ(I2C1_IRQn);

__HAL_I2C_ENABLE_IT(&hi2c1, I2C_IT_ADDRI); 

}

/**************Stop mode configuraions***************/

StopModeConfig(){

HAL_I2CEx_EnableWakeUp(&hi2c1);

// __HAL_I2C_ENABLE_IT(&hi2c1, I2C_IT_ADDRI); // TBD: Use the I2C as a Wake-up source

HAL_SuspendTick();

HAL_PWR_EnterSTOPMode(PWR_MAINREGULATOR_ON, PWR_STOPENTRY_WFI);

HAL_ResumeTick();

}

I have also tried with the below lines before entering into the stop mode.

HAL_I2C_DisableListen_IT(&hi2c1);

HAL_I2CEx_EnableWakeUp(&hi2c1);

HAL_I2C_EnableListen_IT(&hi2c1);

When I use the sleep mode instead of stop mode, the device can wake up on i2c events. I need help to wake up the STM32C0 from the stop mode when any I2C event occurs.

Thanks

[TDK]

The RM has a detailed setion on this. I would work through what it says to do, verify HAL is setting things correctly, verify your clock source is acceptable. Examine registers at the point just before HAL_PWR_EnterSTOPMode is called.

See "23.4.15 Wake-up from Stop mode on address match" in RM0490.

[ttcoder]

Hi TDK,

Thanks for your response. I have tried your suggestions and also checked the RM. I have corrected the I2C clock settings to HSI48 and before entering the stop mode, I have also tried to disable HAL_I2C_DisableListen_IT(), but still, the STM32 is not waking up from the stop mode!  Here I am attaching the code, Can you please help me with this? 

/* USER CODE BEGIN Header */
/**
 ******************************************************************************
 */
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"

/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
/* USER CODE END Includes */

/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */

/* USER CODE END PD */

/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/

I2C_HandleTypeDef hi2c1;

/* USER CODE BEGIN PV */
/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
void PeriphCommonClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_I2C1_Init(void);
/* USER CODE BEGIN PFP */
/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */

/* USER CODE END 0 */

/**
  * @brief  The application entry point.
  * @retval int
  */
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();

/* Configure the peripherals common clocks */
  PeriphCommonClock_Config();

  /* USER CODE BEGIN SysInit */

  /* USER CODE END SysInit */

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_I2C1_Init();
  /* USER CODE BEGIN 2 */

	/* Enable Power Control clock */
	__HAL_RCC_PWR_CLK_ENABLE();

  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
	if (HAL_I2C_EnableListen_IT(&hi2c1) != HAL_OK) {
		/* Transfer error in reception process */
		Error_Handler();
	}
	while (1) {
    /* USER CODE END WHILE */

    HAL_I2CEx_EnableWakeUp(&hi2c1);
    HAL_SuspendTick();
    HAL_PWR_EnterSTOPMode(PWR_MAINREGULATOR_ON, PWR_STOPENTRY_WFI);
    HAL_ResumeTick();

    /* USER CODE BEGIN 3 */

		Power_Management();
		HAL_Delay(100);
	}

  /* USER CODE END 3 */
}

/**
  * @brief System Clock Configuration
  * @retval None
  */
void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

  /** Initializes the RCC Oscillators according to the specified parameters
  * in the RCC_OscInitTypeDef structure.
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.HSIDiv = RCC_HSI_DIV4;
  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }

  /** Initializes the CPU, AHB and APB buses clocks
  */
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                              |RCC_CLOCKTYPE_PCLK1;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI;
  RCC_ClkInitStruct.SYSCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_HCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_APB1_DIV1;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK)
  {
    Error_Handler();
  }
}

/**
  * @brief Peripherals Common Clock Configuration
  * @retval None
  */
void PeriphCommonClock_Config(void)
{
  RCC_PeriphCLKInitTypeDef PeriphClkInit = {0};

  /** Initializes the common peripherals clocks
  */
  PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_HSIKER;
  PeriphClkInit.HSIKerClockDivider = RCC_HSIKER_DIV1;

  if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
  {
    Error_Handler();
  }
}

/**
  * @brief I2C1 Initialization Function
  * @PAram None
  * @retval None
  */
static void MX_I2C1_Init(void)
{

  /* USER CODE BEGIN I2C1_Init 0 */

  /* USER CODE END I2C1_Init 0 */

  /* USER CODE BEGIN I2C1_Init 1 */

  /* USER CODE END I2C1_Init 1 */
  hi2c1.Instance = I2C1;
  hi2c1.Init.Timing = 0x20303E5D;
  hi2c1.Init.OwnAddress1 = 64;
  hi2c1.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
  hi2c1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
  hi2c1.Init.OwnAddress2 = 0;
  hi2c1.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
  hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
  hi2c1.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
  __HAL_I2C_ENABLE_IT(&hi2c1, I2C_IT_ADDRI);

  if (HAL_I2C_Init(&hi2c1) != HAL_OK)
  {
    Error_Handler();
  }

  /** Configure Analogue filter
  */
  if (HAL_I2CEx_ConfigAnalogFilter(&hi2c1, I2C_ANALOGFILTER_ENABLE) != HAL_OK)
  {
    Error_Handler();
  }

  /** Configure Digital filter
  */
  if (HAL_I2CEx_ConfigDigitalFilter(&hi2c1, 0) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN I2C1_Init 2 */
	// Enable and set I2C interrupt priority
	HAL_NVIC_SetPriority(I2C1_IRQn, 0, 0);
	HAL_NVIC_EnableIRQ(I2C1_IRQn);

  /* USER CODE END I2C1_Init 2 */

}

/**
  * @brief GPIO Initialization Function
  * @PAram None
  * @retval None
  */
static void MX_GPIO_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};
/* USER CODE BEGIN MX_GPIO_Init_1 */

/* USER CODE END MX_GPIO_Init_1 */

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


  /* EXTI interrupt init*/
  HAL_NVIC_SetPriority(EXTI2_3_IRQn, 0, 0);
  HAL_NVIC_EnableIRQ(EXTI2_3_IRQn);

  HAL_NVIC_SetPriority(EXTI4_15_IRQn, 0, 0);
  HAL_NVIC_EnableIRQ(EXTI4_15_IRQn);

/* USER CODE BEGIN MX_GPIO_Init_2 */
/* USER CODE END MX_GPIO_Init_2 */
}

/* 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 */
	__disable_irq();
	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,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
  /* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */