二、硬件電路
圖13_0 SD卡槽電路圖
三、實驗原理
STM32F407上帶有SDIO控制器，iCore3核心板上將SDIO連接到TF卡座上。本實驗將Micro SD卡插入TF卡座上即可。硬件連接示意圖如下：
圖13_1 實驗原理圖
四、源代碼
1. 主函數
- /*
- * Name : main
- * Description : ---
- * Author : ysloveivy.
- *
- * History
- * --------------------
- * Rev : 0.00
- * Date : 12/01/2015
- *
- * create.
- * --------------------
- */int main(void)
- {
- int i;
- led.initialize();
- usart4.initialize(115200);
- usart4.printf("\x0c"); //清屏
- usart4.printf("\033[1;32;40m"); //設置字體終端為綠色
- usart4.printf("\r\n\r\nhello! I am iCore3!\r\n\r\n\r\n");
- //判斷SD卡是否初始化
- if(SD_Init() != 0){
- usart4.printf("SD ERROR!\r\n");
- while(1){
- for(i = 0;i < 10000000;i++);
- LED_RED_ON;
- for(i = 0;i < 10000000;i++);
- LED_RED_OFF;
- }
- }
- //輸出SD卡的類型
- switch(SDCardInfo.CardType){
- case SDIO_STD_CAPACITY_SD_CARD_V1_1:
- usart4.printf("SDCardType\t\t:SDIO_STD_CAPACITY_SD_CARD_V1_1\r\n");
- break;
- case SDIO_STD_CAPACITY_SD_CARD_V2_0:
- usart4.printf("SDCardType\t\t:SDIO_STD_CAPACITY_SD_CARD_V2_0\r\n");
- break;
- case SDIO_HIGH_CAPACITY_SD_CARD:
- usart4.printf("SDCardType\t\t:SDIO_HIGH_CAPACITY_SD_CARD\r\n");
- break;
- case SDIO_MULTIMEDIA_CARD:
- usart4.printf("SD CardType\t:SDIO_MULTIMEDIA_CARD\r\n");
- break;
- }
- //輸出SD卡的參數
- usart4.printf("SD CardCapacity\t\t: %dMB\r\n",(unsigned long int)(SDCardInfo.CardCapacity >> 20));
- usart4.printf("SDCardBlockSize\t: %dByte\r\n",SDCardInfo.CardBlockSize);
- usart4.printf("SD RCA \t\t\t: %d\r\n",SDCardInfo.RCA);
- usart4.printf("SDManufacturerID\t: %d\r\n",SDCardInfo.SD_cid.ManufacturerID);
- while(1){
- for(i = 0;i < 10000000;i++);
- LED_GREEN_ON;
- for(i = 0;i < 10000000;i++);
- LED_GREEN_OFF;
- }
- }
2.SDIO配置結構體
- SDIO_InitStructure.SDIO_ClockDiv = SDIO_TRANSFER_CLK_DIV + 2;
- SDIO_InitStructure.SDIO_ClockEdge = SDIO_ClockEdge_Rising;
- SDIO_InitStructure.SDIO_ClockBypass = SDIO_ClockBypass_Disable;
- SDIO_InitStructure.SDIO_ClockPowerSave = SDIO_ClockPowerSave_Disable;
- SDIO_InitStructure.SDIO_BusWide = SDIO_BusWide_1b;
- SDIO_InitStructure.SDIO_HardwareFlowControl = SDIO_HardwareFlowControl_Disable;
- SDIO_Init(&SDIO_InitStructure);
3.SD卡初始化程序
- SD_Error SD_Init(void)
- {
- __IO SD_Error errorstatus = SD_OK;
- NVIC_InitTypeDef NVIC_InitStructure;
- NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
- // SDIO Interrupt ENABLE
- NVIC_InitStructure.NVIC_IRQChannel = SDIO_IRQn;
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
- NVIC_Init(&NVIC_InitStructure);
- // DMA2 STREAMx Interrupt ENABLE
- NVIC_InitStructure.NVIC_IRQChannel = SD_SDIO_DMA_IRQn;
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
- NVIC_Init(&NVIC_InitStructure);
- /* SDIO Peripheral Low Level Init */
- SD_LowLevel_Init();
- SDIO_DeInit();
- errorstatus = SD_PowerON();
- if (errorstatus != SD_OK)
- {
- /*!< CMD Response TimeOut (wait for CMDSENT flag) */
- return(errorstatus);
- }
- errorstatus = SD_InitializeCards();
- if (errorstatus != SD_OK)
- {
- /*!< CMD Response TimeOut (wait for CMDSENT flag) */
- return(errorstatus);
- }
五、實驗現象
在終端顯示屏上可以看到Micro SD卡的信息，如下圖：
圖13_2 實驗現象顯示圖
六 、代碼包下載
網盤：http://pan.baidu.com/s/1hqM787E
