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/**
******************************************************************************
* @file SPI/SPI_FullDuplex_AdvComPolling/Slave/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
* Polling 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_HAL_Examples
* @{
*/
/** @addtogroup SPI_FullDuplex_AdvComPolling
* @{
*/
/** @addtogroup Slave
* @{
*/
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define SPI_ACK_BYTES 0xA5A5
#define SPI_NACK_BYTES 0xDEAD
#define SPI_SLAVE_SYNBYTE 0x53
#define SPI_MASTER_SYNBYTE 0xAC
#define SPI_TIMEOUT_MAX 0x1000
/* Defines used for transfer communication*/
#define ADDRCMD_MASTER_READ ((uint16_t)0x1234)
#define ADDRCMD_MASTER_WRITE ((uint16_t)0x5678)
#define CMD_LENGTH ((uint16_t)0x0004)
#define DATA_LENGTH ((uint16_t)0x0020)
/* Private macro ------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* SPI handler declaration */
SPI_HandleTypeDef SpiHandle;
/* Buffer used for transmission */
uint8_t aTxMasterBuffer[] = "SPI - MASTER - Transmit message";
uint8_t aTxSlaveBuffer[] = "SPI - SLAVE - Transmit message ";
/* Buffer used for reception */
uint8_t aRxBuffer[DATA_LENGTH];
/* Private function prototypes -----------------------------------------------*/
static void Slave_Synchro(void);
static void SystemClock_Config(void);
static void Error_Handler(void);
static uint16_t Buffercmp(uint8_t* pBuffer1, uint8_t* pBuffer2, uint16_t BufferLength);
static void Flush_Buffer(uint8_t* pBuffer, uint16_t BufferLength);
/* Private functions ---------------------------------------------------------*/
/**
* @brief Main program
* @param None
* @retval None
*/
int main(void)
{
uint16_t addrcmd = 0;
uint16_t comlength = 0;
uint8_t pAddrcmd[CMD_LENGTH] = {0x00};
uint16_t ackbyte = 0x0000;
/* STM32F4xx HAL library initialization:
- Configure the Flash prefetch, instruction and Data caches
- Configure the Systick to generate an interrupt each 1 msec
- Set NVIC Group Priority to 4
- Global MSP (MCU Support Package) initialization
*/
HAL_Init();
/* Configure the system clock to 168 MHz */
SystemClock_Config();
/* Configure LED5 and LED6 */
BSP_LED_Init(LED5);
BSP_LED_Init(LED6);
/*##-1- Configure the SPI peripheral #######################################*/
/* Set the SPI parameters */
SpiHandle.Instance = SPIx;
SpiHandle.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_4;
SpiHandle.Init.Direction = SPI_DIRECTION_2LINES;
SpiHandle.Init.CLKPhase = SPI_PHASE_2EDGE;
SpiHandle.Init.CLKPolarity = SPI_POLARITY_LOW;
SpiHandle.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
SpiHandle.Init.CRCPolynomial = 7;
SpiHandle.Init.DataSize = SPI_DATASIZE_8BIT;
SpiHandle.Init.FirstBit = SPI_FIRSTBIT_MSB;
SpiHandle.Init.NSS = SPI_NSS_SOFT;
SpiHandle.Init.TIMode = SPI_TIMODE_DISABLE;
SpiHandle.Init.Mode = SPI_MODE_SLAVE;
if(HAL_SPI_Init(&SpiHandle) != HAL_OK)
{
/* Initialization Error */
Error_Handler();
}
/* enter while loop too keep treating new request from Master */
while(1)
{
/* Synchronization between Master and Slave */
Slave_Synchro();
/* Receive command from Master */
if(HAL_SPI_Receive(&SpiHandle, pAddrcmd, CMD_LENGTH, SPI_TIMEOUT_MAX) != HAL_OK)
{
Error_Handler();
}
/* Compute command and required data length */
addrcmd = (uint16_t) ((pAddrcmd[0] << 8) | pAddrcmd[1]);
comlength = (uint16_t) ((pAddrcmd[2] << 8) | pAddrcmd[3]);
/* Check if received command correct */
if(((addrcmd == ADDRCMD_MASTER_READ) || (addrcmd == ADDRCMD_MASTER_WRITE)) && (comlength > 0))
{
/* Synchronization between Master and Slave */
Slave_Synchro();
/* Send acknowledge to Master */
ackbyte = SPI_ACK_BYTES;
if(HAL_SPI_Transmit(&SpiHandle, (uint8_t *)&ackbyte, sizeof(ackbyte), SPI_TIMEOUT_MAX) != HAL_OK)
{
Error_Handler();
}
/* Check if Master requiring data read or write */
if(addrcmd == ADDRCMD_MASTER_READ)
{
/* Synchronization between Master and Slave */
Slave_Synchro();
/* Send data to Master */
if(HAL_SPI_Transmit(&SpiHandle, aTxSlaveBuffer, DATA_LENGTH, SPI_TIMEOUT_MAX) != HAL_OK)
{
Error_Handler();
}
/* Synchronization between Master and Slave */
Slave_Synchro();
/* Receive acknowledgement from Master */
ackbyte = 0;
if(HAL_SPI_Receive(&SpiHandle, (uint8_t *)&ackbyte, sizeof(ackbyte), SPI_TIMEOUT_MAX) != HAL_OK)
{
Error_Handler();
}
/* Check acknowledgement */
if(ackbyte != SPI_ACK_BYTES)
{
Error_Handler();
}
}
else if(addrcmd == ADDRCMD_MASTER_WRITE)
{
/* Synchronization between Master and Slave */
Slave_Synchro();
/* Receive data from Master */
if(HAL_SPI_Receive(&SpiHandle, aRxBuffer, DATA_LENGTH, SPI_TIMEOUT_MAX) != HAL_OK)
{
Error_Handler();
}
/* Synchronization between Master and Slave */
Slave_Synchro();
/* Send acknowledgement to Master */
ackbyte = SPI_ACK_BYTES;
if(HAL_SPI_Transmit(&SpiHandle, (uint8_t *)&ackbyte, sizeof(ackbyte), SPI_TIMEOUT_MAX) != HAL_OK)
{
Error_Handler();
}
/* In case, Master has sent data, compare received buffer with one expected */
if(Buffercmp((uint8_t*)aTxMasterBuffer, (uint8_t*)aRxBuffer, DATA_LENGTH))
{
/* Transfer error in transmission process */
Error_Handler();
}
else
{
/* Toggle LED6 on: Reception is correct */
BSP_LED_Toggle(LED6);
}
}
}
else
{
/* Synchronization between Master and Slave */
Slave_Synchro();
/* Send acknowledgement to Master */
ackbyte = SPI_NACK_BYTES;
if(HAL_SPI_Transmit(&SpiHandle, (uint8_t *)&ackbyte, sizeof(ackbyte), SPI_TIMEOUT_MAX) != HAL_OK)
{
Error_Handler();
}
Error_Handler();
}
/* Flush Rx buffer for next transmission */
Flush_Buffer(aRxBuffer, DATA_LENGTH);
}
}
/**
* @brief Slave synchronization with Master
* @param None
* @retval None
*/
static void Slave_Synchro(void)
{
uint8_t txackbyte = SPI_SLAVE_SYNBYTE, rxackbyte = 0x00;
do
{
if (HAL_SPI_TransmitReceive(&SpiHandle, (uint8_t *)&txackbyte, (uint8_t *)&rxackbyte, 1, HAL_MAX_DELAY) != HAL_OK)
{
Error_Handler();
}
}
while (rxackbyte != SPI_MASTER_SYNBYTE);
}
/**
* @brief System Clock Configuration
* The system Clock is configured as follow :
* System Clock source = PLL (HSE)
* SYSCLK(Hz) = 168000000
* HCLK(Hz) = 168000000
* AHB Prescaler = 1
* APB1 Prescaler = 4
* APB2 Prescaler = 2
* HSE Frequency(Hz) = 8000000
* PLL_M = 8
* PLL_N = 336
* PLL_P = 2
* PLL_Q = 7
* VDD(V) = 3.3
* Main regulator output voltage = Scale1 mode
* Flash Latency(WS) = 5
* @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 HSE Oscillator and activate PLL with HSE as source */
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;
HAL_RCC_OscConfig(&RCC_OscInitStruct);
/* 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_DIV4;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5);
/* STM32F405x/407x/415x/417x Revision Z and upper devices: prefetch is supported */
if (HAL_GetREVID() >= 0x1001)
{
/* Enable the Flash prefetch */
__HAL_FLASH_PREFETCH_BUFFER_ENABLE();
}
}
/**
* @brief This function is executed in case of error occurrence.
* @param None
* @retval None
*/
static void Error_Handler(void)
{
/* Turn LED5 on */
BSP_LED_On(LED5);
while(1)
{
}
}
/**
* @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;
}
/**
* @brief Flushes the buffer
* @param pBuffer: buffers to be flushed.
* @param BufferLength: buffer's length
* @retval None
*/
static void Flush_Buffer(uint8_t* pBuffer, uint16_t BufferLength)
{
while (BufferLength--)
{
*pBuffer = 0;
pBuffer++;
}
}
#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
/**
* @}
*/
/**
* @}
*/
/**
* @}
*/
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