/**
  ******************************************************************************
  * @file    USART/Synchronous/main.c 
  * @author  MCD Application Team
  * @version V3.5.0
  * @date    08-April-2011
  * @brief   Main program body
  ******************************************************************************
  * @attention
  *
  * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
  * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
  * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
  * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
  * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
  * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
  *
  * <h2><center>&copy; COPYRIGHT 2011 STMicroelectronics</center></h2>
  ******************************************************************************
  */ 

/* Includes ------------------------------------------------------------------*/
#include "stm32f10x.h"
#include "platform_config.h"

/** @addtogroup STM32F10x_StdPeriph_Examples
  * @{
  */

/** @addtogroup USART_Synchronous
  * @{
  */ 

/* Private typedef -----------------------------------------------------------*/
typedef enum {FAILED = 0, PASSED = !FAILED} TestStatus;

/* Private define ------------------------------------------------------------*/
#define TxBufferSize1   (countof(TxBuffer1) - 1)
#define TxBufferSize2   (countof(TxBuffer2) - 1)
#define DYMMY_BYTE      0x00

/* Private macro -------------------------------------------------------------*/
#define countof(a)   (sizeof(a) / sizeof(*(a)))

/* Private variables ---------------------------------------------------------*/
USART_InitTypeDef USART_InitStructure;
USART_ClockInitTypeDef USART_ClockInitStructure; 

uint8_t TxBuffer1[] = "USART Synchronous Example: USARTy -> SPIy using TXE and RXNE Flags";
uint8_t TxBuffer2[] = "USART Synchronous Example: SPIy -> USARTy using TXE and RXNE Flags";
uint8_t RxBuffer1[TxBufferSize2];
uint8_t RxBuffer2[TxBufferSize1];
__IO uint8_t NbrOfDataToRead1 = TxBufferSize2;
__IO uint8_t NbrOfDataToRead2 = TxBufferSize1;
__IO uint8_t TxCounter1 = 0, RxCounter1 = 0;
__IO uint8_t TxCounter2 = 0, RxCounter2 = 0;
volatile TestStatus TransferStatus1 = FAILED, TransferStatus2 = FAILED; 

/* Private function prototypes -----------------------------------------------*/
void RCC_Configuration(void);
void GPIO_Configuration(void);
void SPI_Configuration(void);
TestStatus Buffercmp(uint8_t* pBuffer1, uint8_t* pBuffer2, uint16_t BufferLength);

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

/**
  * @brief  Main program
  * @param  None
  * @retval None
  */
int main(void)
{
  /*!< At this stage the microcontroller clock setting is already configured, 
       this is done through SystemInit() function which is called from startup
       file (startup_stm32f10x_xx.s) before to branch to application main.
       To reconfigure the default setting of SystemInit() function, refer to
       system_stm32f10x.c file
     */     
       
  /* System Clocks Configuration */
  RCC_Configuration();

  /* Configure the GPIO ports */
  GPIO_Configuration();

  /* Configure the SPI */
  SPI_Configuration();

/* USARTy configuration ------------------------------------------------------*/
  /* USARTy configured as follow:
        - BaudRate = 115200 baud  
        - Word Length = 8 Bits
        - One Stop Bit
        - No parity
        - Hardware flow control disabled (RTS and CTS signals)
        - Receive and transmit enabled
        - USART Clock Enabled
        - USART CPOL: Clock is active High
        - USART CPHA: Data is captured on the second edge 
        - USART LastBit: The clock pulse of the last data bit is output to 
                         the SCLK pin
  */
  USART_ClockInitStructure.USART_Clock = USART_Clock_Enable;
  USART_ClockInitStructure.USART_CPOL = USART_CPOL_High;
  USART_ClockInitStructure.USART_CPHA = USART_CPHA_2Edge;
  USART_ClockInitStructure.USART_LastBit = USART_LastBit_Enable;
  USART_ClockInit(USARTy, &USART_ClockInitStructure);

  USART_InitStructure.USART_BaudRate = 115200;
  USART_InitStructure.USART_WordLength = USART_WordLength_8b;
  USART_InitStructure.USART_StopBits = USART_StopBits_1;
  USART_InitStructure.USART_Parity = USART_Parity_No ;
  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
  USART_Init(USARTy, &USART_InitStructure);
  
  /* Configure the USARTy */
  USART_Init(USARTy, &USART_InitStructure);

  /* Enable the USARTy */
  USART_Cmd(USARTy, ENABLE);

  while(NbrOfDataToRead2--)
  {
    /* Write one byte in the USARTy Transmit Data Register */
    USART_SendData(USARTy, TxBuffer1[TxCounter1++]);
    /* Wait until end of transmit */
    while(USART_GetFlagStatus(USARTy, USART_FLAG_TC) == RESET)
    {
    }
    /* Wait the byte is entirely received by SPIy */  
    while(SPI_I2S_GetFlagStatus(SPIy, SPI_I2S_FLAG_RXNE) == RESET)
    {
    }
    /* Store the received byte in the RxBuffer2 */
    RxBuffer2[RxCounter2++] = SPI_I2S_ReceiveData(SPIy);
  }

  /* Clear the USARTy Data Register */
  USART_ReceiveData(USARTy);

  while(NbrOfDataToRead1--)
  {
    /* Wait until end of transmit */
    while(SPI_I2S_GetFlagStatus(SPIy, SPI_I2S_FLAG_TXE)== RESET)
    {
    }
    /* Write one byte in the SPIy Transmit Data Register */
    SPI_I2S_SendData(SPIy, TxBuffer2[TxCounter2++]);

    /* Send a Dummy byte to generate clock to slave */ 
    USART_SendData(USARTy, DYMMY_BYTE);
    /* Wait until end of transmit */
    while(USART_GetFlagStatus(USARTy, USART_FLAG_TC) == RESET)
    {
    }
    /* Wait the byte is entirely received by USARTy */
    while(USART_GetFlagStatus(USARTy, USART_FLAG_RXNE) == RESET)
    {
    }
    /* Store the received byte in the RxBuffer1 */
    RxBuffer1[RxCounter1++] = USART_ReceiveData(USARTy);
  }
  
  /* Check the received data with the send ones */
  TransferStatus1 = Buffercmp(TxBuffer1, RxBuffer2, TxBufferSize1);
  /* TransferStatus = PASSED, if the data transmitted from USARTy and  
     received by SPIy are the same */
  /* TransferStatus = FAILED, if the data transmitted from USARTy and 
     received by SPIy are different */
  TransferStatus2 = Buffercmp(TxBuffer2, RxBuffer1, TxBufferSize2);
  /* TransferStatus = PASSED, if the data transmitted from SPIy and  
     received by USARTy are the same */
  /* TransferStatus = FAILED, if the data transmitted from SPIy and 
     received by USARTy are different */

  while (1)
  {
  }
}

/**
  * @brief  Configures the different system clocks.
  * @param  None
  * @retval None
  */
void RCC_Configuration(void)
{   
  /* Enable GPIO clock */
  RCC_APB2PeriphClockCmd(USARTy_GPIO_CLK | SPIy_GPIO_CLK | RCC_APB2Periph_AFIO, ENABLE);

  /* Enable USARTy Clock */
  RCC_APB2PeriphClockCmd(USARTy_CLK, ENABLE); 
  /* Enable SPIy Clock */
  RCC_APB2PeriphClockCmd(SPIy_CLK, ENABLE);    
}

/**
  * @brief  Configures the different GPIO ports.
  * @param  None
  * @retval None
  */
void GPIO_Configuration(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;

  /* Configure USARTy TX and USARTy CK pins as alternate function push-pull */
  GPIO_InitStructure.GPIO_Pin = USARTy_TxPin | USARTy_ClkPin;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(USARTy_GPIO, &GPIO_InitStructure);

  /* Configure SPI1 pins: SCK, MISO and MOSI */
  GPIO_InitStructure.GPIO_Pin = SPIy_SCKPin | SPIy_MISOPin | SPIy_MOSIPin;
  GPIO_Init(SPIy_GPIO, &GPIO_InitStructure);

  /* Configure USARTy RX as input floating */
  GPIO_InitStructure.GPIO_Pin = USARTy_RxPin;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(USARTy_GPIO, &GPIO_InitStructure);
}

/**
  * @brief  Configures the SPI.
  * @param  None
  * @retval None
  */
void SPI_Configuration(void)
{
  SPI_InitTypeDef SPI_InitStructure;

  SPI_StructInit(&SPI_InitStructure);

  SPI_I2S_DeInit(SPIy);

  /* SPIy Config */
  SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
  SPI_InitStructure.SPI_Mode = SPI_Mode_Slave;
  SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
  SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
  SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
  SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
  SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_LSB;
  
  /* Configure SPIy */
  SPI_Init(SPIy, &SPI_InitStructure);

  /* SPIy enable */
  SPI_Cmd(SPIy, ENABLE);
}

/**
  * @brief  Compares two buffers.
  * @param  pBuffer1, pBuffer2: buffers to be compared.
  * @param  BufferLength: buffer's length
  * @retval PASSED: pBuffer1 identical to pBuffer2
  *         FAILED: pBuffer1 differs from pBuffer2
  */
TestStatus Buffercmp(uint8_t* pBuffer1, uint8_t* pBuffer2, uint16_t BufferLength)
{
  while(BufferLength--)
  {
    if(*pBuffer1 != *pBuffer2)
    {
      return FAILED;
    }

    pBuffer1++;
    pBuffer2++;
  }

  return PASSED;
}

#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 2011 STMicroelectronics *****END OF FILE****/
