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I2C HAL_I2C_SlaveRxCpltCallback is not called on slave after master transmit

HPate.12
Associate II

‎2025-06-06 3:02 PM - edited ‎2025-06-06 3:09 PM

Hi,

I am trying to establish I2C communication between STM32C011 (Master) and STM32C031 Nucleo Board (Slave).

I transmit a message from the master, however, the slave side sees that the master wants to write to the slave (using HAL_I2C_AddrCallback) however, the HAL_I2C_SlaveRxCpltCallback is never called.

In another post, I see that the buffer length may be an issue, so I tried to transmit just one character but to no avail.

ChatGPT suggested I shouldn't re-arm the HAL_I2C_Slave_Receive_IT function as it can cause it to get stuck. I tried it with and without but same result.

I see "Master wants to write to slave" only once upon power up/reset of the slave MCU.


Master Side:

#include "main.h"
#define SLAVE_ADDR 0x42 << 1  

I2C_HandleTypeDef hi2c1;

SPI_HandleTypeDef hspi1;

void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_SPI1_Init(void);
static void MX_I2C1_Init(void);

uint8_t TX_Buffer [] = "A"; 
//uint8_t TX_Buffer [] = "MasterToSlave"; // DATA to send
uint8_t RX_Buffer [14]; 

int main(void)
{
  HAL_Init();

  SystemClock_Config();

  MX_GPIO_Init();
  MX_SPI1_Init();
  MX_I2C1_Init();
  
	toggleRED(4,4,100);

  while (1)
  {
	master_send_receive();
  }
  
}

void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

  __HAL_FLASH_SET_LATENCY(FLASH_LATENCY_1);

  
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.HSIDiv = RCC_HSI_DIV1;
  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }

  
  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_1) != HAL_OK)
  {
    Error_Handler();
  }
}


static void MX_I2C1_Init(void)
{

  hi2c1.Instance = I2C1;
  hi2c1.Init.Timing = 0x10805D88;
  hi2c1.Init.OwnAddress1 = 0;
  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();
  }

  
  if (HAL_I2CEx_ConfigAnalogFilter(&hi2c1, I2C_ANALOGFILTER_ENABLE) != HAL_OK)
  {
    Error_Handler();
  }

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

}


static void MX_SPI1_Init(void)
{
  hspi1.Instance = SPI1;
  hspi1.Init.Mode = SPI_MODE_MASTER;
  hspi1.Init.Direction = SPI_DIRECTION_2LINES;
  hspi1.Init.DataSize = SPI_DATASIZE_16BIT;
  hspi1.Init.CLKPolarity = SPI_POLARITY_LOW;
  hspi1.Init.CLKPhase = SPI_PHASE_1EDGE;
  hspi1.Init.NSS = SPI_NSS_SOFT;
  hspi1.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_32;
  hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB;
  hspi1.Init.TIMode = SPI_TIMODE_DISABLE;
  hspi1.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
  hspi1.Init.CRCPolynomial = 7;
  hspi1.Init.CRCLength = SPI_CRC_LENGTH_DATASIZE;
  hspi1.Init.NSSPMode = SPI_NSS_PULSE_ENABLE;
  if (HAL_SPI_Init(&hspi1) != HAL_OK)
  {
    Error_Handler();
  }
}


static void MX_GPIO_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};

  __HAL_RCC_GPIOB_CLK_ENABLE();
  __HAL_RCC_GPIOC_CLK_ENABLE();
  __HAL_RCC_GPIOA_CLK_ENABLE();

  HAL_GPIO_WritePin(GPIOC, Bank2RED_Pin|Bank1RED_Pin, GPIO_PIN_RESET);
  HAL_GPIO_WritePin(GPIOA, Bank1Latch_Pin|Bank2Latch_Pin|Bank3Latch_Pin|Bank4Latch_Pin
                          |Bank34WHT_Pin, GPIO_PIN_RESET);
  
  GPIO_InitStruct.Pin = Bank2RED_Pin|Bank1RED_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);

  GPIO_InitStruct.Pin = Bank1Latch_Pin|Bank2Latch_Pin|Bank3Latch_Pin|Bank4Latch_Pin
                          |Bank34WHT_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  GPIO_InitStruct.Pin = Bank4BTN_Pin|Bank3BTN_Pin|Bank1BTN_Pin|Bank2BTN_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_IT_RISING;
  GPIO_InitStruct.Pull = GPIO_PULLUP;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

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

void master_send_receive(void)
{
	
	HAL_Delay(1000);

	//if (HAL_I2C_IsDeviceReady (&hi2c1, SLAVE_ADDR, 3, 1000) == HAL_OK)
	{
		toggleRED(1,4,100);

		if (HAL_I2C_Master_Transmit(&hi2c1, SLAVE_ADDR, TX_Buffer, strlen((char*)TX_Buffer), 1000) == HAL_OK)
		{
			toggleRED(3,1,1000);
		}

		if (HAL_I2C_Master_Receive(&hi2c1, SLAVE_ADDR, RX_Buffer, sizeof(RX_Buffer), 1000) == HAL_OK)
		
		{
			toggleRED(4,2,100);
			
			if ((RX_Buffer[0] != 0)||(RX_Buffer[1] != 0)||(RX_Buffer[2] != 0)||(RX_Buffer[3] != 0)||(RX_Buffer[4] != 0)||(RX_Buffer[5] != 0)||(RX_Buffer[6] != 0))
			{
				HAL_GPIO_TogglePin(RED_GPIO_PORT[1], RED_GPIO_PIN[1]);
			}
		}
	}
	
}

void toggleRED(uint8_t bank, uint8_t blinks, uint16_t msDelay)
{

	for(uint8_t i=0; i<blinks; i++)
	{
		HAL_GPIO_TogglePin(RED_GPIO_PORT[bank], RED_GPIO_PIN[bank]);
		HAL_Delay(msDelay);
		HAL_GPIO_TogglePin(RED_GPIO_PORT[bank], RED_GPIO_PIN[bank]);
		HAL_Delay(msDelay/2);
	}
}

void Error_Handler(void)
{
  __disable_irq();
  while (1)
  {
  }
  
}

#ifdef  USE_FULL_ASSERT

void assert_failed(uint8_t *file, uint32_t line)
{
  
}
#endif

 

Slave Side:

#include "main.h"
#include <stdio.h>

I2C_HandleTypeDef hi2c1;

TIM_HandleTypeDef htim3;

UART_HandleTypeDef huart2;

void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_I2C1_Init(void);
static void MX_TIM3_Init(void);
static void MX_USART2_UART_Init(void);

uint8_t Slave_TX_Buffer [] = "SlaveToMaster";
uint8_t Slave_RX_Buffer [1];

int main(void)
{
  
  HAL_Init();
  SystemClock_Config();
  MX_GPIO_Init();
  MX_I2C1_Init();
  MX_TIM3_Init();
  MX_USART2_UART_Init();
  
  HAL_TIM_Base_Start_IT(&htim3);
  __enable_irq();

  toggleLED(4,100);

  if (HAL_I2C_EnableListen_IT(&hi2c1) != HAL_OK)
  {
	  printf("Failed to enable I2C listen mode\r\n");
  }
  
  while (1)
  {

	  //HAL_Delay(1000);

  }
  
}

void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

  __HAL_FLASH_SET_LATENCY(FLASH_LATENCY_1);

  
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.HSIDiv = RCC_HSI_DIV1;
  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }

  
  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_1) != HAL_OK)
  {
    Error_Handler();
  }
}


static void MX_I2C1_Init(void)
{

  hi2c1.Instance = I2C1;
  hi2c1.Init.Timing = 0x10805D88;
  hi2c1.Init.OwnAddress1 = 132; 
  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();
  }

  if (HAL_I2CEx_ConfigAnalogFilter(&hi2c1, I2C_ANALOGFILTER_ENABLE) != HAL_OK)
  {
    Error_Handler();
  }

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


static void MX_TIM3_Init(void)
{

  TIM_ClockConfigTypeDef sClockSourceConfig = {0};
  TIM_MasterConfigTypeDef sMasterConfig = {0};

  htim3.Instance = TIM3;
  htim3.Init.Prescaler = 47999;
  htim3.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim3.Init.Period = 9999;
  htim3.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
  htim3.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
  if (HAL_TIM_Base_Init(&htim3) != HAL_OK)
  {
    Error_Handler();
  }
  sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
  if (HAL_TIM_ConfigClockSource(&htim3, &sClockSourceConfig) != HAL_OK)
  {
    Error_Handler();
  }
  sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
  if (HAL_TIMEx_MasterConfigSynchronization(&htim3, &sMasterConfig) != HAL_OK)
  {
    Error_Handler();
  }
}


static void MX_USART2_UART_Init(void)
{
  huart2.Instance = USART2;
  huart2.Init.BaudRate = 57600;
  huart2.Init.WordLength = UART_WORDLENGTH_8B;
  huart2.Init.StopBits = UART_STOPBITS_1;
  huart2.Init.Parity = UART_PARITY_NONE;
  huart2.Init.Mode = UART_MODE_TX_RX;
  huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  huart2.Init.OverSampling = UART_OVERSAMPLING_16;
  huart2.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
  huart2.Init.ClockPrescaler = UART_PRESCALER_DIV1;
  huart2.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
  if (HAL_UART_Init(&huart2) != HAL_OK)
  {
    Error_Handler();
  }
}


static void MX_GPIO_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};

  __HAL_RCC_GPIOC_CLK_ENABLE();
  __HAL_RCC_GPIOA_CLK_ENABLE();
  __HAL_RCC_GPIOB_CLK_ENABLE();

  
  HAL_GPIO_WritePin(GRNLED_GPIO_Port, GRNLED_Pin, GPIO_PIN_RESET);

  GPIO_InitStruct.Pin = BLUBTN_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_IT_RISING;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  HAL_GPIO_Init(BLUBTN_GPIO_Port, &GPIO_InitStruct);
 
  GPIO_InitStruct.Pin = GRNLED_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(GRNLED_GPIO_Port, &GPIO_InitStruct);
 
  HAL_NVIC_SetPriority(EXTI4_15_IRQn, 0, 0);
  HAL_NVIC_EnableIRQ(EXTI4_15_IRQn);
}

int __io_putchar(int ch)
{
	HAL_UART_Transmit(&huart2, (uint8_t *)&ch, 1, HAL_MAX_DELAY);
	return ch;
}

void HAL_GPIO_EXTI_Rising_Callback(uint16_t GPIO_Pin)
{
	HAL_GPIO_TogglePin(GRNLED_GPIO_Port, GRNLED_Pin);
	
}

void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
	printf("10 Seconds Elapsed\r\n");	
}

void HAL_I2C_AddrCallback(I2C_HandleTypeDef *hi2c, uint8_t TransferDirection, uint16_t AddrMatchCode)
{
    if (hi2c->Instance == I2C1)
    {
        if (TransferDirection == I2C_DIRECTION_TRANSMIT)
        {
            printf("Master wants to write to slave\r\n");
            HAL_I2C_Slave_Receive_IT(hi2c, Slave_RX_Buffer, sizeof(Slave_RX_Buffer));
        }
        else if (TransferDirection == I2C_DIRECTION_RECEIVE)
        {
            printf("Master wants to read from slave\r\n");
            HAL_I2C_Slave_Transmit_IT(hi2c, Slave_TX_Buffer, sizeof(Slave_TX_Buffer));
        }
    }
}

void HAL_I2C_ListenCpltCallback(I2C_HandleTypeDef *hi2c)
{
    if (hi2c->Instance == I2C1)
    {
        printf("Listen complete. Re-enabling listen mode.\r\n");
        HAL_I2C_EnableListen_IT(hi2c);
    }
}

void HAL_I2C_SlaveRxCpltCallback(I2C_HandleTypeDef *hi2c)
{
	
	{
		printf("SlaveRxCpltCallback triggered. Data: %s\r\n", Slave_RX_Buffer);
		toggleLED(1,1000);

    HAL_I2C_Slave_Receive_IT(&hi2c1, Slave_RX_Buffer, sizeof(Slave_RX_Buffer));
	}
}

void HAL_I2C_SlaveTxCpltCallback(I2C_HandleTypeDef *hi2c)
{
	if (hi2c->Instance == I2C1)
	{
		printf("SlaveRxCpltCallback triggered. Data: %s\r\n", Slave_RX_Buffer);
		HAL_GPIO_WritePin(GRNLED_GPIO_Port, GRNLED_Pin, GPIO_PIN_SET);
		printf("I2C message sent from tx callback interrupt.\r\n");

		HAL_I2C_Slave_Transmit_IT(&hi2c1, Slave_TX_Buffer, sizeof(Slave_TX_Buffer));

	}
}

void HAL_I2C_ErrorCallback(I2C_HandleTypeDef *hi2c)
{
    if (hi2c->Instance == I2C1)
    {
        printf("I2C error occurred. Re-arming receive.\r\n");
        HAL_I2C_Slave_Receive_IT(&hi2c1, Slave_RX_Buffer, sizeof(Slave_RX_Buffer));
    }
}

void toggleLED(uint8_t blinks, uint16_t msDelay)
{

	for(uint8_t i=0; i<blinks; i++)
	{
		
		HAL_GPIO_TogglePin(GRNLED_GPIO_Port, GRNLED_Pin);
		HAL_Delay(msDelay);
		HAL_GPIO_TogglePin(GRNLED_GPIO_Port, GRNLED_Pin);
		HAL_Delay(msDelay/2);
	}
}

void Error_Handler(void)
{
  __disable_irq();
  while (1)
  {
  }
  
}

#ifdef  USE_FULL_ASSERT

void assert_failed(uint8_t *file, uint32_t line)
{

}
#endif

 

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Karl Yamashita
Principal

‎2025-06-06 3:39 PM

Did you enable the NVIC?

KarlYamashita_0-1749249538821.png

 

Don't worry, I won't byte.
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