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/**
******************************************************************************
* @file SPI/SPI_HalfDuplex_ComPollingIT/Src/main.c
* @author MCD Application Team
* @brief This sample code shows how to use STM32F4xx SPI HAL API to transmit
* and receive a data buffer with a communication process based on
* Interrupt transfer.
* The communication is done using 2 Boards.
******************************************************************************
* @attention
*
* Copyright (c) 2017 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "main.h"
/** @addtogroup STM32F4xx_MIX_Examples
* @{
*/
/** @addtogroup SPI_FullDuplex_ComIT
* @{
*/
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
enum {
TRANSFER_WAIT,
TRANSFER_COMPLETE,
TRANSFER_ERROR
};
/* Private macro -------------------------------------------------------------*/
/* Uncomment this line to use the board as master, if not it is used as slave */
#define MASTER_BOARD
/* Private variables ---------------------------------------------------------*/
/* SPI handler declaration */
SPI_HandleTypeDef SpiHandle;
/* Buffer used for transmission */
uint8_t aTxBuffer[] = "**** SPI - Two Boards communication based on Polling (LL driver) for Master Board and Interrupt (HAL Driver) for Slave Board ****";
#ifdef MASTER_BOARD
__IO uint8_t ubNbDataToTransmit = BUFFERSIZE;
__IO uint8_t ubNbDataTransmitted = 0;
#endif
/* Buffer used for reception */
uint8_t aRxBuffer[BUFFERSIZE];
/* transfer state */
__IO uint32_t wTransferState = TRANSFER_WAIT;
/* Private function prototypes -----------------------------------------------*/
static void SystemClock_Config(void);
static void Error_Handler(void);
#ifndef MASTER_BOARD
static uint16_t Buffercmp(uint8_t *pBuffer1, uint8_t *pBuffer2, uint16_t BufferLength);
#endif
/* Private functions ---------------------------------------------------------*/
/**
* @brief Main program.
* @param None
* @retval None
*/
int main(void)
{
/* STM32F4xx HAL library initialization:
- Configure the Flash prefetch
- Systick timer is configured by default as source of time base, but user
can eventually implement his proper time base source (a general purpose
timer for example or other time source), keeping in mind that Time base
duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and
handled in milliseconds basis.
- Set NVIC Group Priority to 4
- Low Level Initialization
*/
HAL_Init();
/* Configure the system clock to 100 MHz */
SystemClock_Config();
/* Configure LED2 */
BSP_LED_Init(LED2);
/*##-1- Configure the SPI peripheral #######################################*/
/* Set the SPI parameters */
SpiHandle.Instance = SPIx;
SpiHandle.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_256;
SpiHandle.Init.Direction = SPI_DIRECTION_1LINE;
SpiHandle.Init.CLKPhase = SPI_PHASE_1EDGE;
SpiHandle.Init.CLKPolarity = SPI_POLARITY_LOW;
SpiHandle.Init.DataSize = SPI_DATASIZE_8BIT;
SpiHandle.Init.FirstBit = SPI_FIRSTBIT_MSB;
SpiHandle.Init.TIMode = SPI_TIMODE_DISABLE;
SpiHandle.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
SpiHandle.Init.CRCPolynomial = 7;
SpiHandle.Init.NSS = SPI_NSS_SOFT;
#ifdef MASTER_BOARD
SpiHandle.Init.Mode = SPI_MODE_MASTER;
#else
SpiHandle.Init.Mode = SPI_MODE_SLAVE;
#endif /* MASTER_BOARD */
if(HAL_SPI_Init(&SpiHandle) != HAL_OK)
{
/* Initialization Error */
Error_Handler();
}
#ifdef MASTER_BOARD
/* Configure User push-button */
BSP_PB_Init(BUTTON_KEY, BUTTON_MODE_GPIO);
/* Wait for User push-button press before starting the Communication */
while (BSP_PB_GetState(BUTTON_KEY) == GPIO_PIN_SET)
{
BSP_LED_Toggle(LED2);
HAL_Delay(100);
}
BSP_LED_Off(LED2);
/*##-2- Start the Half Duplex Communication process ########################*/
/* Half Duplex Direction (Tx) not Done by HAL_Init. */
LL_SPI_SetTransferDirection(SpiHandle.Instance, LL_SPI_HALF_DUPLEX_TX);
/* Enable SPI before start transmission */
LL_SPI_Enable(SpiHandle.Instance);
while(ubNbDataToTransmit > 0)
{
/* Check TXE flag to transmit data */
if(LL_SPI_IsActiveFlag_TXE(SpiHandle.Instance))
{
/* Transmit 8bit Data */
LL_SPI_TransmitData8(SpiHandle.Instance, aTxBuffer[ubNbDataTransmitted++]);
ubNbDataToTransmit--;
}
}
/* Wait End Of Transmission: TXE set and Tx Fifo empty */
while((LL_SPI_IsActiveFlag_TXE(SpiHandle.Instance) != 1));
/* Disable SPI after End of Transmission */
LL_SPI_Disable(SpiHandle.Instance);
#else /* Slave Board */
/*##-2- Start the Half Duplex Communication process ########################*/
/* While the SPI in Receive process, user can receive data through "aRxBuffer" */
if(HAL_SPI_Receive_IT(&SpiHandle, (uint8_t *)aRxBuffer, BUFFERSIZE) != HAL_OK)
{
/* Transfer error in transmission process */
Error_Handler();
}
/*##-3- Wait for the end of the transfer ###################################*/
/* Before starting a new communication transfer, you must wait the callback call
to get the transfer complete confirmation or an error detection.
For simplicity reasons, this example is just waiting till the end of the
transfer, but application may perform other tasks while transfer operation
is ongoing. */
while (wTransferState == TRANSFER_WAIT)
{
}
switch(wTransferState)
{
case TRANSFER_COMPLETE :
/*##-4- Compare the sent and received buffers ##############################*/
if(Buffercmp((uint8_t*)aTxBuffer, (uint8_t*)aRxBuffer, BUFFERSIZE))
{
/* Processing Error */
Error_Handler();
}
else
{
BSP_LED_On(LED2);
}
break;
default :
Error_Handler();
break;
}
#endif /* MASTER_BOARD */
/* Infinite loop */
while (1)
{
}
}
/**
* @brief System Clock Configuration
* The system Clock is configured as follow :
* System Clock source = PLL (HSE)
* SYSCLK(Hz) = 100000000
* HCLK(Hz) = 100000000
* AHB Prescaler = 1
* APB1 Prescaler = 2
* APB2 Prescaler = 1
* HSI Frequency(Hz) = 8000000
* PLL_M = 8
* PLL_N = 400
* PLL_P = 4
* PLL_Q = 7
* VDD(V) = 3.3
* Main regulator output voltage = Scale1 mode
* Flash Latency(WS) = 3
* @param None
* @retval None
*/
static void SystemClock_Config(void)
{
RCC_ClkInitTypeDef RCC_ClkInitStruct;
RCC_OscInitTypeDef RCC_OscInitStruct;
/* Enable Power Control clock */
__HAL_RCC_PWR_CLK_ENABLE();
/* The voltage scaling allows optimizing the power consumption when the device is
clocked below the maximum system frequency, to update the voltage scaling value
regarding system frequency refer to product datasheet. */
__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
/* Enable HSI Oscillator and activate PLL with HSI as source */
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
RCC_OscInitStruct.HSEState = RCC_HSE_BYPASS;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
RCC_OscInitStruct.PLL.PLLM = 8;
RCC_OscInitStruct.PLL.PLLN = 400;
RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV4;
RCC_OscInitStruct.PLL.PLLQ = 7;
if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}
/* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
clocks dividers */
RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
if(HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_3) != HAL_OK)
{
Error_Handler();
}
}
/**
* @brief This function is executed in case of error occurrence.
* @param None
* @retval None
*/
static void Error_Handler(void)
{
while(1)
{
/* Toggle LED2 */
BSP_LED_Toggle(LED2);
HAL_Delay(1000);
}
}
#ifndef MASTER_BOARD
/**
* @brief Compares two buffers.
* @param pBuffer1, pBuffer2: buffers to be compared.
* @param BufferLength: buffer's length
* @retval 0 : pBuffer1 identical to pBuffer2
* >0 : pBuffer1 differs from pBuffer2
*/
static uint16_t Buffercmp(uint8_t *pBuffer1, uint8_t *pBuffer2, uint16_t BufferLength)
{
while (BufferLength--)
{
if((*pBuffer1) != *pBuffer2)
{
return BufferLength;
}
pBuffer1++;
pBuffer2++;
}
return 0;
}
#endif
#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 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) */
/* Infinite loop */
while (1)
{
}
}
#endif
/******************************************************************************/
/* USER IRQ HANDLER TREATMENT */
/******************************************************************************/
#ifndef MASTER_BOARD
/**
* @brief Tx Transfer completed callback.
* @param hspi: SPI handle
* @note This example shows a simple way to report end of Interrupt Tx transfer, and
* you can add your own implementation.
* @retval None
*/
void HAL_SPI_RxCpltCallback(SPI_HandleTypeDef *hspi)
{
/* Transfer in reception process is complete */
wTransferState = TRANSFER_COMPLETE;
}
/**
* @brief SPI error callbacks.
* @param hspi: SPI handle
* @note This example shows a simple way to report transfer error, and you can
* add your own implementation.
* @retval None
*/
void HAL_SPI_ErrorCallback(SPI_HandleTypeDef *hspi)
{
wTransferState = TRANSFER_ERROR;
}
#endif
/**
* @}
*/
/**
* @}
*/
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