STM32 DMA I2C 实验代码详解

00001 /**
00002   ******************************************************************************
00003   * @file    DMA/I2C_RAM/main.c 
00004   * @author  MCD Application Team
00005   * @version V3.5.0
00006   * @date    08-April-2011
00007   * @brief   Main program body
00008   ******************************************************************************
00009   * @attention
00010   *
00011   * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
00012   * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
00013   * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
00014   * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
00015   * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
00016   * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
00017   *
00018   * <h2><center>&copy; COPYRIGHT 2011 STMicroelectronics</center></h2>
00019   ******************************************************************************
00020   */ 
00021 
00022 /* Includes ------------------------------------------------------------------*/
00023 #include "stm32f10x.h"
00024 
00025 /** @addtogroup STM32F10x_StdPeriph_Examples
00026   * @{
00027   */
00028 
00029 /** @addtogroup DMA_I2C_RAM
00030   * @{

00031   */ 
00032 
00033 /* Private typedef -----------------------------------------------------------*/
00034 typedef enum { FAILED = 0, PASSED = !FAILED} TestStatus;
00035 
00036 /* Private define ------------------------------------------------------------*/
00037 #define I2C1_DR_Address        0x40005410
00038 #define I2C2_DR_Address        0x40005810
00039 #define I2C1_SLAVE_ADDRESS7    0x30
00040 #define I2C2_SLAVE_ADDRESS7    0x30
00041 #define BufferSize             8
00042 #define ClockSpeed             100000
00043 
00044 /* Private macro -------------------------------------------------------------*/
00045 /* Private variables ---------------------------------------------------------*/
00046 I2C_InitTypeDef  I2C_InitStructure;
00047 DMA_InitTypeDef  DMA_InitStructure;
00048 uint8_t I2C1_Buffer_Tx[BufferSize] = {1, 2, 3, 4, 5, 6, 7, 8};
00049 uint8_t I2C2_Buffer_Rx[BufferSize];
00050 uint8_t Tx_Idx = 0, Rx_Idx = 0;
00051 volatile TestStatus TransferStatus;
00052     
00053 /* Private function prototypes -----------------------------------------------*/
00054 void RCC_Configuration(void);
00055 void GPIO_Configuration(void);
00056 TestStatus Buffercmp(uint8_t* pBuffer, uint8_t* pBuffer1, uint16_t BufferLength);
00057     
00058 /* Private functions ---------------------------------------------------------*/
00059 
00060 /**