/**
  ******************************************************************************
  * @file    SPI/SPI_HalfDuplex_ComPolling/Src/main.c
  * @author  MCD Application Team
  * @brief   This sample code shows how to use STM32F3xx 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
  *
  * <h2><center>&copy; COPYRIGHT(c) 2017 STMicroelectronics</center></h2>
  *
  * 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"

/** @addtogroup STM32F3xx_HAL_Examples
  * @{
  */

/** @addtogroup SPI_HalfDuplex_ComPolling
  * @{
  */ 

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* HalfDuplex communication direction */
#define RX 0
#define TX 1

/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* SPI handler declaration */
SPI_HandleTypeDef SpiHandle;

/* Buffer used for transmission */
uint8_t aTxBuffer[] = "**** SPI  - Two Boards Half Duplex communication based on Polling **** SPI Message ******** ";

/* Buffer used for reception */
uint8_t aRxBuffer[BUFFERSIZE];

/* Transmission status */
HAL_StatusTypeDef Errorcode = HAL_OK;

/* Private function prototypes -----------------------------------------------*/
static void SystemClock_Config(void);
static void Error_Handler(void);
static void Timeout_Error_Handler(void);
static uint16_t Buffercmp(uint8_t *pBuffer1, uint8_t *pBuffer2, uint16_t BufferLength);
static void Check_Error (HAL_StatusTypeDef Errorcode, uint8_t Direction);


/* Private functions ---------------------------------------------------------*/

/**
  * @brief  Main program.
  * @param  None
  * @retval None
  */
int main(void)
{
  /* STM32F3xx HAL library initialization:
       - Configure the Flash prefetch
       - Configure the Systick to generate an interrupt each 1 msec
       - Set NVIC Group Priority to 4
       - Low Level Initialization
     */
  HAL_Init();

  /* Configure the system clock to 64 MHz */
  SystemClock_Config();
  
  /* Configure LED1, LED2 and LED3 */
  BSP_LED_Init(LED1);
  BSP_LED_Init(LED2);
  BSP_LED_Init(LED3);

  /*##-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.CRCLength         = SPI_CRC_LENGTH_8BIT;
  SpiHandle.Init.NSS               = SPI_NSS_SOFT;
  SpiHandle.Init.NSSPMode          = SPI_NSS_PULSE_DISABLE;

#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_USER, BUTTON_MODE_GPIO);

  /* Wait for User push-button press before starting the Communication */
  while (BSP_PB_GetState(BUTTON_USER) != GPIO_PIN_SET)
  {
    BSP_LED_Toggle(LED1);
    HAL_Delay(100);
  }
  BSP_LED_Off(LED1);
  
  /*##-2- MASTER : Start the Half Duplex Communication : TX ########################*/
  /* Timeout is set to 5 seconds */
  Errorcode = HAL_SPI_Transmit(&SpiHandle, (uint8_t*)aTxBuffer, BUFFERSIZE, 5000);
  Check_Error(Errorcode, TX);

  HAL_Delay(2000);

  /*##-3- MASTER : Start the Half Duplex Communication : RX ########################*/
  /* Timeout is set to 5 seconds */
  /* Disable SPI before changing direction */
  __HAL_SPI_DISABLE(&SpiHandle);
  Errorcode = HAL_SPI_Receive(&SpiHandle, (uint8_t*)aRxBuffer, BUFFERSIZE, 5000);
  Check_Error(Errorcode, RX);

#else /* SLAVE_BOARD */
  /*##-2- SLAVE : Start the Half Duplex Communication : RX ########################*/
  /* Timeout is set to 60 seconds to wait Push-Button press */
  Errorcode = HAL_SPI_Receive(&SpiHandle, (uint8_t*)aRxBuffer, BUFFERSIZE, 60000);
  Check_Error(Errorcode, RX);

  /*##-3- SLAVE : Start the Half Duplex Communication : TX ########################*/
  /* Timeout is set to 5 seconds */
  /* Disable SPI before changing direction */
  /* Transmission of the received buffer */
  __HAL_SPI_DISABLE(&SpiHandle);
  Errorcode = HAL_SPI_Transmit(&SpiHandle, (uint8_t*)aRxBuffer, BUFFERSIZE, 5000);
  Check_Error(Errorcode, TX);

#endif

  /* Infinite loop */
  while (1)
  {
  }
}

/**
  * @brief  This function is executed to test the transmission status
  * @param  None
  * @retval None
  */
static void Check_Error (HAL_StatusTypeDef Errorcode, uint8_t Direction)
{
  switch(Errorcode)
  {
    case HAL_OK:
      if (Direction == TX)
      {
        /* Turn LED1 on: Transmission complete */
        BSP_LED_On(LED1);
      }
      else
      {
        if (Buffercmp((uint8_t *)aTxBuffer, (uint8_t *)aRxBuffer, BUFFERSIZE))
        {
          /* Turn LED3 on : Transfer error in transmission process */
          Error_Handler();
        }
        else
        {          
          /* Turn LED2 on: Reception complete */
           BSP_LED_On(LED2);
        }
      }
    break;
      
    case HAL_TIMEOUT:
      /* Toggle LED3 : A timeout occur */
      Timeout_Error_Handler();
    break;
      
    case HAL_ERROR:
      /* Toggle LED3 on : An error occur */
      Error_Handler();
    break;

    default :
    break;
  } 
}

/**
  * @brief  This function is executed in case of timeout.
  * @param  None
  * @retval None
  */
static void Timeout_Error_Handler(void)
{
  /* Toggle LED3 */
  while(1)
  {
    BSP_LED_Toggle(LED3);
    HAL_Delay(500);
  }
}

/**
  * @brief  This function is executed in case of error occurrence.
  * @param  None
  * @retval None
  */
static void Error_Handler(void)
{
  /* Turn LED3 on */
  BSP_LED_On(LED3);
  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  System Clock Configuration
  *         The system Clock is configured as follow : 
  *            System Clock source            = PLL (HSI)
  *            SYSCLK(Hz)                     = 64000000
  *            HCLK(Hz)                       = 64000000
  *            AHB Prescaler                  = 1
  *            APB1 Prescaler                 = 2
  *            APB2 Prescaler                 = 1
  *            HSI Frequency(Hz)              = 8000000
  *            PREDIV                         = RCC_PREDIV_DIV2 (2)
  *            PLLMUL                         = RCC_PLL_MUL16 (16)
  *            Flash Latency(WS)              = 2
  * @param  None
  * @retval None
  */
void SystemClock_Config(void)
{
  RCC_ClkInitTypeDef RCC_ClkInitStruct;
  RCC_OscInitTypeDef RCC_OscInitStruct;
  
  /* HSI Oscillator already ON after system reset, activate PLL with HSI as source */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_NONE;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
  RCC_OscInitStruct.PLL.PREDIV = RCC_PREDIV_DIV2;
  RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL16;
  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct)!= HAL_OK)
  {
    /* Initialization Error */
    while(1); 
  }

  /* 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_2)!= HAL_OK)
  {
    /* Initialization Error */
    while(1); 
  }
}
#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(char* 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

/**
  * @}
  */

/**
  * @}
  */

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