/**
  ******************************************************************************
  * @file    DMA/I2C_RAM/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"

/** @addtogroup STM32F10x_StdPeriph_Examples
  * @{
  */

/** @addtogroup DMA_I2C_RAM
  * @{
  */ 

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

/* Private define ------------------------------------------------------------*/
#define I2C1_DR_Address        0x40005410
#define I2C2_DR_Address        0x40005810
#define I2C1_SLAVE_ADDRESS7    0x30
#define I2C2_SLAVE_ADDRESS7    0x30
#define BufferSize             8
#define ClockSpeed             100000

/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
I2C_InitTypeDef  I2C_InitStructure;
DMA_InitTypeDef  DMA_InitStructure;
uint8_t I2C1_Buffer_Tx[BufferSize] = {1, 2, 3, 4, 5, 6, 7, 8};
uint8_t I2C2_Buffer_Rx[BufferSize];
uint8_t Tx_Idx = 0, Rx_Idx = 0;
volatile TestStatus TransferStatus;
    
/* Private function prototypes -----------------------------------------------*/
void RCC_Configuration(void);
void GPIO_Configuration(void);
TestStatus Buffercmp(uint8_t* pBuffer, uint8_t* pBuffer1, 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();

  /* DMA1 channel5 configuration ----------------------------------------------*/
  DMA_DeInit(DMA1_Channel5);
  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)I2C2_DR_Address;
  DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)I2C2_Buffer_Rx;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
  DMA_InitStructure.DMA_BufferSize = BufferSize;
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_MemoryDataSize_Byte;
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
  DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
  DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
  DMA_Init(DMA1_Channel5, &DMA_InitStructure);

  /* DMA1 channel6 configuration ----------------------------------------------*/
  DMA_DeInit(DMA1_Channel6);
  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)I2C1_DR_Address;
  DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)I2C1_Buffer_Tx;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
  DMA_InitStructure.DMA_Priority = DMA_Priority_High;
  DMA_Init(DMA1_Channel6, &DMA_InitStructure);

  /* Enable I2C1 and I2C2 ----------------------------------------------------*/
  I2C_Cmd(I2C1, ENABLE);
  I2C_Cmd(I2C2, ENABLE);

  /* I2C1 configuration ------------------------------------------------------*/
  I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
  I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
  I2C_InitStructure.I2C_OwnAddress1 = I2C1_SLAVE_ADDRESS7;
  I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
  I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
  I2C_InitStructure.I2C_ClockSpeed = ClockSpeed;
  I2C_Init(I2C1, &I2C_InitStructure);
  /* I2C2 configuration ------------------------------------------------------*/
  I2C_InitStructure.I2C_OwnAddress1 = I2C2_SLAVE_ADDRESS7;
  I2C_Init(I2C2, &I2C_InitStructure);
  
  /*----- Transmission Phase -----*/
  /* Send I2C1 START condition */
  I2C_GenerateSTART(I2C1, ENABLE);
  /* Test on I2C1 EV5 and clear it */
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));  
  /* Send I2C2 slave Address for write */
  I2C_Send7bitAddress(I2C1, I2C2_SLAVE_ADDRESS7, I2C_Direction_Transmitter);
  /* Test on I2C2 EV1 and clear it */
  while(!I2C_CheckEvent(I2C2, I2C_EVENT_SLAVE_RECEIVER_ADDRESS_MATCHED));  
  /* Test on I2C1 EV6 and clear it */
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));  

  /* Enable I2C2 DMA */
  I2C_DMACmd(I2C2, ENABLE);
  /* Enable I2C1 DMA */
  I2C_DMACmd(I2C1, ENABLE);

  /* Enable DMA1 Channel5 */
  DMA_Cmd(DMA1_Channel5, ENABLE);
  /* Enable DMA1 Channel6 */
  DMA_Cmd(DMA1_Channel6, ENABLE);

  /* DMA1 Channel5 transfer complete test */
  while(!DMA_GetFlagStatus(DMA1_FLAG_TC5));
  /* DMA1 Channel6 transfer complete test */
  while(!DMA_GetFlagStatus(DMA1_FLAG_TC6));

  /* Send I2C1 STOP Condition */
  I2C_GenerateSTOP(I2C1, ENABLE);
  /* Test on I2C2 EV4 */
  while(!I2C_CheckEvent(I2C2, I2C_EVENT_SLAVE_STOP_DETECTED)); 
  /* Clear I2C2 STOPF flag: read operation to I2C_SR1 followed by a 
  write operation to I2C_CR1 */
  (void)(I2C_GetFlagStatus(I2C2, I2C_FLAG_STOPF));
  I2C_Cmd(I2C2, ENABLE);


  /* Check if the transmitted and received data are equal */
  TransferStatus = Buffercmp(I2C1_Buffer_Tx, I2C2_Buffer_Rx, BufferSize);
  /* TransferStatus = PASSED, if the transmitted and received data 
     are the same */
  /* TransferStatus = FAILED, if the transmitted and received data 
     are different */

  while (1)
  {
  }
}

/**
  * @brief  Configures the different system clocks.
  * @param  None
  * @retval None
  */
void RCC_Configuration(void)
{
  /* Enable DMA1 clock */
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
  /* Enable GPIOB clock */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
  /* Enable I2C1 and I2C2 clock */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1 | RCC_APB1Periph_I2C2, ENABLE);
}

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

  /* Configure I2C1 pins: SCL and SDA */
  GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_6 | GPIO_Pin_7;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
  GPIO_Init(GPIOB, &GPIO_InitStructure);

  /* Configure I2C2 pins: SCL and SDA */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11;
  GPIO_Init(GPIOB, &GPIO_InitStructure);
}

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

  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****/
