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/**
  ******************************************************************************
  * @file    SPI/SPI_FullDuplex_ComIT/Src/main.c
  * @author  MCD Application Team
  * @version V1.1.0
  * @date    30-December-2016 
  * @brief   This sample code shows how to use STM32F7xx 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
  *
  * <h2><center>&copy; COPYRIGHT(c) 2016 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 STM32F7xx_HAL_Examples
  * @{
  */

/** @addtogroup SPI_FullDuplex_ComIT
  * @{
  */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
enum {
	TRANSFER_WAIT,
	TRANSFER_COMPLETE,
	TRANSFER_ERROR
};

/* Private macro -------------------------------------------------------------*/

#define SpiEn HAL_GPIO_WritePin(GPIOI,GPIO_PIN_0,GPIO_PIN_RESET);
#define SpiDis HAL_GPIO_WritePin(GPIOI,GPIO_PIN_0,GPIO_PIN_SET);
/* Private variables ---------------------------------------------------------*/
/* SPI handler declaration */
SPI_HandleTypeDef SpiHandle;
uint16_t temperature_data=0x3841; // degisti rastgele yaptim 0011 1000 0000 0000 (2048 için)  initial room temperature 
/* Buffer used for transmission */
uint8_t aTxBuffer[2];


/* transfer state */
__IO uint32_t wTransferState = TRANSFER_WAIT;

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void Error_Handler(void);
static void CPU_CACHE_Enable(void);
void SendBytebyByte(uint16_t data, uint8_t config);
static void MX_GPIO_Init(void);
static void MX_SPI2_Init(void);
/* Private functions ---------------------------------------------------------*/

/**
  * @brief  Main program.
  * @param  None
  * @retval None
  */
int main(void)
{
  /* Enable the CPU Cache */
  CPU_CACHE_Enable();

  /* STM32F7xx HAL library initialization:
       - Configure the Flash ART accelerator
       - 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 216 MHz */
  SystemClock_Config();
	MX_GPIO_Init();
	MX_SPI2_Init();

  /*##-2- Start the Full Duplex Communication process ########################*/  
  /* While the SPI in TransmitReceive process, user can transmit data through 
     "aTxBuffer" buffer & receive data through "aRxBuffer" */
	
	SendBytebyByte(temperature_data, 0x30); //0x30 for MCP4921


  if(HAL_SPI_Transmit_IT(&SpiHandle, (uint8_t*)aTxBuffer, 2) != 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(HAL_SPI_GetState(&SpiHandle)!= HAL_SPI_STATE_READY)
      {
        /* Processing Error */
        Error_Handler();     
      }
    break;
    default : 
      Error_Handler();
    break;
  }

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


void SendBytebyByte(uint16_t data, uint8_t config)
{
	uint8_t top_msg = (config & 0xF0) | (0x0F & (data >> 8));
  
  // Take the bottom octet of data
  uint8_t lower_msg = (data & 0x00FF);
   
  // Select our DAC
  //SpiEn;
  // Send first 8 bits
  aTxBuffer[0]= top_msg;
  // Send second 8 bits
  aTxBuffer[1]=lower_msg;
  //SpiDis;
}

static void MX_GPIO_Init(void)
{

  GPIO_InitTypeDef GPIO_InitStruct;

  /* GPIO Ports Clock Enable */
  __HAL_RCC_GPIOI_CLK_ENABLE();
  __HAL_RCC_GPIOH_CLK_ENABLE();
  __HAL_RCC_GPIOB_CLK_ENABLE();

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(GPIOI, GPIO_PIN_0, GPIO_PIN_RESET);

  /*Configure GPIO pin : PI3 */
  GPIO_InitStruct.Pin = GPIO_PIN_3;
  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  HAL_GPIO_Init(GPIOI, &GPIO_InitStruct);

  /*Configure GPIO pin : PI0 */
  GPIO_InitStruct.Pin = GPIO_PIN_0;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
  HAL_GPIO_Init(GPIOI, &GPIO_InitStruct);

}

static void MX_SPI2_Init(void)
{
	  /*##-1- Configure the SPI peripheral #######################################*/
  /* Set the SPI parameters */
  SpiHandle.Instance               = SPI2;
  SpiHandle.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_256;
  SpiHandle.Init.Direction         = SPI_DIRECTION_2LINES;
  SpiHandle.Init.CLKPhase          = SPI_PHASE_1EDGE;
  SpiHandle.Init.CLKPolarity       = SPI_POLARITY_HIGH;
  SpiHandle.Init.DataSize          = SPI_DATASIZE_8BIT; //2 adet arka arkaya yollariz
  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;
  SpiHandle.Init.Mode 						 = SPI_MODE_MASTER;
	if(HAL_SPI_Init(&SpiHandle) != HAL_OK)
  {
    /* Initialization Error */
    Error_Handler();
  }
}

/**
  * @brief  System Clock Configuration
  *         The system Clock is configured as follow : 
  *            System Clock source            = PLL (HSE)
  *            SYSCLK(Hz)                     = 216000000
  *            HCLK(Hz)                       = 216000000
  *            AHB Prescaler                  = 1
  *            APB1 Prescaler                 = 4
  *            APB2 Prescaler                 = 2
  *            HSE Frequency(Hz)              = 25000000
  *            PLL_M                          = 25
  *            PLL_N                          = 432
  *            PLL_P                          = 2
  *            PLL_Q                          = 9
  *            VDD(V)                         = 3.3
  *            Main regulator output voltage  = Scale1 mode
  *            Flash Latency(WS)              = 7
  * @param  None
  * @retval None
  */
void SystemClock_Config(void)
{
  RCC_ClkInitTypeDef RCC_ClkInitStruct;
  RCC_OscInitTypeDef RCC_OscInitStruct;
  HAL_StatusTypeDef ret = HAL_OK;

  /* 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 = 25;
  RCC_OscInitStruct.PLL.PLLN = 432;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
  RCC_OscInitStruct.PLL.PLLQ = 9;
  
  ret = HAL_RCC_OscConfig(&RCC_OscInitStruct);
  if(ret != HAL_OK)
  {
    while(1) { ; }
  }
  
  /* Activate the OverDrive to reach the 216 MHz Frequency */  
  ret = HAL_PWREx_EnableOverDrive();
  if(ret != HAL_OK)
  {
    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_DIV4;  
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2; 
  
  ret = HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_7);
  if(ret != HAL_OK)
  {
    while(1) { ; }
  }  
}

/**
  * @brief  TxRx Transfer completed callback.
  * @param  hspi: SPI handle
  * @note   This example shows a simple way to report end of Interrupt TxRx transfer, and 
  *         you can add your own implementation. 
  * @retval None
  */
void HAL_SPI_TxRxCpltCallback(SPI_HandleTypeDef *hspi)
{
      /* Configure LED1 which is shared with SPI2_SCK signal */
      BSP_LED_Init(LED1);
  /* Turn LED on: Transfer in transmission/reception process is correct */
  BSP_LED_On(LED1);
  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;
}

/**
  * @brief  This function is executed in case of error occurrence.
  * @param  None
  * @retval None
  */
static void Error_Handler(void)
{
  /* Configure LED1 which is shared with SPI2_SCK signal */
  BSP_LED_Init(LED1);
  while(1)
  {
    /* Toggle LED1 */
    BSP_LED_Toggle(LED1);
    HAL_Delay(1000);
  }
}

/**
  * @brief  CPU L1-Cache enable.
  * @param  None
  * @retval None
  */
static void CPU_CACHE_Enable(void)
{
  /* Enable I-Cache */
  SCB_EnableICache();

  /* Enable D-Cache */
  SCB_EnableDCache();
}

#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

/**
  * @}
  */

/**
  * @}
  */

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