Stm32F412 SPI interrupt full duplex slave.

[Kpand.1]

Hi I am working on stm32F4 on spi communication. I am using stm32F4 as slave module and i have other qualcomm board as master module. as in master module there are 5 pins as MOSI,MISO,SCK,CS,INTR. when I am generating the code for stm32f4 using cubemx there are only 4 pins as MOSI,MISO,SCK,NSS. Now I dont know where to connect INT(interrupt pin) in stm32.

as I am very new in spi communication please help.

[Jack Peacock_2]

The slave board uses the master board INTR interrupt request to notify the master board it has data available. Use a GPIO pin set to output to drive INTR. When you have prepared the SPI slave buffer and DMA is initialized for the transfer then assert INTR. The master will perform a data transfer. When your local DMA TC flag asserts the transfer is complete and you deassert the INTR request.

Jack Peacock

[Kpand.1]

Hi Jack thanks for quick reply,

as per your suggestion i made pd2 pin as gpio_output pin and generated code as below i made changes in main.c as below

MISO->MISO

MOSI->MOSI

CS->NSS

SCK->CLK

INTR->PD2

but its not working as expected.

main.c

/**

 ******************************************************************************

 * File Name     : main.c

 * Description    : Main program body

 ******************************************************************************

 *

 * COPYRIGHT(c) 2020 STMicroelectronics

 *

 * Redistribution and use in source and binary forms, with or without modification,

 * are permitted provided that the following conditions are met:

 *  1. Redistributions of source code must retain the above copyright notice,

 *   this list of conditions and the following disclaimer.

 *  2. Redistributions in binary form must reproduce the above copyright notice,

 *   this list of conditions and the following disclaimer in the documentation

 *   and/or other materials provided with the distribution.

 *  3. Neither the name of STMicroelectronics nor the names of its contributors

 *   may be used to endorse or promote products derived from this software

 *   without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR

 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER

 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,

 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 *

 ******************************************************************************

 */

/* Includes ------------------------------------------------------------------*/

#include "main.h"

#include "stm32f4xx_hal.h"

/* USER CODE BEGIN Includes */

/* USER CODE END Includes */

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

SPI_HandleTypeDef hspi2;

/* USER CODE BEGIN PV */

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

/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/

void SystemClock_Config(void);

void Error_Handler(void);

static void MX_GPIO_Init(void);

static void MX_SPI2_Init(void);

uint8_t buff_tx[10]={31,32,33,34,35,36,37,38,39};

uint8_t buff_rx[10];

/* USER CODE BEGIN PFP */

/* Private function prototypes -----------------------------------------------*/

/* USER CODE END PFP */

/* USER CODE BEGIN 0 */

/* USER CODE END 0 */

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();

 /* Configure the system clock */

 SystemClock_Config();

 /* Initialize all configured peripherals */

 MX_GPIO_Init();

 MX_SPI2_Init();

 /* USER CODE BEGIN 2 */

 /* USER CODE END 2 */

 /* Infinite loop */

 /* USER CODE BEGIN WHILE */

 while (1)

 {

 /* USER CODE END WHILE */

  HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2, GPIO_PIN_SET);

  HAL_Delay(500);

  HAL_SPI_Receive(&hspi2,buff_rx,10,1000);

  HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2, GPIO_PIN_RESET);

  HAL_Delay(500);

 /* USER CODE BEGIN 3 */

 }

 /* USER CODE END 3 */

}

/** System Clock Configuration

*/

void SystemClock_Config(void)

{

 RCC_OscInitTypeDef RCC_OscInitStruct;

  /**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_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();

 }

  /**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);

}

/* SPI2 init function */

static void MX_SPI2_Init(void)

{

 hspi2.Instance = SPI2;

 hspi2.Init.Mode = SPI_MODE_SLAVE;

 hspi2.Init.Direction = SPI_DIRECTION_2LINES;

 hspi2.Init.DataSize = SPI_DATASIZE_8BIT;

 hspi2.Init.CLKPolarity = SPI_POLARITY_LOW;

 hspi2.Init.CLKPhase = SPI_PHASE_1EDGE;

 hspi2.Init.NSS = SPI_NSS_HARD_INPUT;

 hspi2.Init.FirstBit = SPI_FIRSTBIT_MSB;

 hspi2.Init.TIMode = SPI_TIMODE_DISABLE;

 hspi2.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;

 hspi2.Init.CRCPolynomial = 10;

 if (HAL_SPI_Init(&hspi2) != HAL_OK)

 {

  Error_Handler();

 }

}

/** Configure pins as 

    * Analog 

    * Input 

    * Output

    * EVENT_OUT

    * EXTI

*/

static void MX_GPIO_Init(void)

{

 GPIO_InitTypeDef GPIO_InitStruct;

 /* GPIO Ports Clock Enable */

 __HAL_RCC_GPIOC_CLK_ENABLE();

 __HAL_RCC_GPIOB_CLK_ENABLE();

 __HAL_RCC_GPIOD_CLK_ENABLE();

 /*Configure GPIO pin Output Level */

 HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2, GPIO_PIN_RESET);

 /*Configure GPIO pin : PD2 */

 GPIO_InitStruct.Pin = GPIO_PIN_2;

 GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;

 GPIO_InitStruct.Pull = GPIO_NOPULL;

 GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;

 HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);

}

/* USER CODE BEGIN 4 */

/* USER CODE END 4 */

/**

 * @brief This function is executed in case of error occurrence.

 * @param None

 * @retval None

 */

void Error_Handler(void)

{

 /* USER CODE BEGIN Error_Handler */

 /* User can add his own implementation to report the HAL error return state */

 while(1) 

 {

 }

 /* USER CODE END Error_Handler */ 

}

#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

/**

 * @}

 */ 

/**

 * @}

*/ 

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

[berendi]

> its not working as expected.

What is expected?

[Kpand.1]

Hi berendi thanks for reply,

As expected it should receive the data send by host. But even host gets stuck and there is nothing coming to slave side.

[waclawek.jan]

> i have other qualcomm board as master module

What is it?

Why do you think it should communicate as SPI master?

Any link to datasheet or manual?

JW

[Kpand.1]

Hi wwaclawek thanks for reply,

Other board is Qualcomm qca4020 which is working as a master. I already have tested with both master and slave as two same qca4020 Qualcomm boards and that is working fine. Now I just want to replace that slave board with stm32. As in two Qualcomm board as master and slave spi communication is working so I just replaced the slave board with stm and didn't touch anything on the master side.

[LMI2]

Have you tried connecting MISO and MOSI from slave board together. Then you test your TX and RX code there.

MISO->MISO

MOSI->MOSI

CS->NSS

SCK->CLK

INTR->PD2

surely GND also.

I have had SPI problems, I loaned a logic analyzer to see what is going on with HW.

[Kpand.1]

Hi lmi thanks for reply. I made connection exactly as

Below

MISO->MISO

MOSI->MOSI

CS->NSS

SCK->CLK

INTR->PD2

GND->GND