Zynq7020-PS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
}