ZYNQ700PS端裸机——EMMC、SD驱动实现

下面来介绍一下，emmc、sd的驱动实现。

一、vivado PL端设置

PL端 设置： 如果你是用sd卡、或者EMMC要在vivado zynq核上勾选 sd、emmc。 emmc和sd使用公用那几个IO.同一个时刻只能当做其中一个使用。 zynq有两个sd接口。也可以一个给sd卡，一个给EMMC使用。 下面的例子是修改官方例程。

二、ps端代码编写

SD 、emm初始化基本一样。这是裸机不需要文件系统。直接对sd卡/emmc进行读写 #ifdef __ICCARM__ #pragma data_alignment = 32 u8 DestinationAddress[10*1024]; #pragma data_alignment = 32 u8 SourceAddress[10*1024]; #else u8 DestinationAddress[10*1024] __attribute__ ((aligned(32))); u8 SourceAddress[10*1024]__attribute__ ((aligned(32))); #endif #define TEST 7/* Number of SD blocks to test */ #define NUM_BLOCKS 16/* Sector offset to test */ #define SECTOR_OFFSET 204800 XSdPs SD_InstancePtr; bool SdCard_Init(void) { static XSdPs SdInstance; XSdPs_Config *SdConfig; int Status; u32 BuffCnt; /* * Since block size is 512 bytes. File Size is 512*BlockCount. */ u32 FileSize = (512*NUM_BLOCKS); /* File Size is only up to 2MB */ u32 Sector = SECTOR_OFFSET; for(BuffCnt = 0; BuffCnt < FileSize; BuffCnt++) { SourceAddress[BuffCnt] = 4; //TEST + BuffCnt; } /* * Initialize the host controller */ SdConfig = XSdPs_LookupConfig(XPAR_XSDPS_1_DEVICE_ID); if (NULL == SdConfig) { return XST_FAILURE; } Status = XSdPs_CfgInitialize(&SdInstance, SdConfig,SdConfig->BaseAddress); if (Status != XST_SUCCESS) { return XST_FAILURE; } Status = XSdPs_CardInitialize(&SdInstance); if (Status != XST_SUCCESS) { return XST_FAILURE; } /* * Write data to SD/eMMC. */ if (!(SdInstance.HCS)) Sector *= XSDPS_BLK_SIZE_512_MASK; Status = XSdPs_WritePolled(&SdInstance, Sector, NUM_BLOCKS, SourceAddress); if (Status != XST_SUCCESS) { return XST_FAILURE; } /* * Read data from SD/eMMC. */ if (!(SdInstance.HCS)) Sector *= XSDPS_BLK_SIZE_512_MASK; Status = XSdPs_ReadPolled(&SdInstance, Sector, NUM_BLOCKS, DestinationAddress); if (Status!=XST_SUCCESS) { return XST_FAILURE; } /* * Data verification */ for(BuffCnt = 0; BuffCnt < FileSize; BuffCnt++) { if(SourceAddress[BuffCnt] != DestinationAddress[BuffCnt]) { Uart_Send("qwert",5); return XST_FAILURE; } } Uart_Send(DestinationAddress,FileSize); //输出从sd或者emmc的数观察对不对 }