zynq7000 SD卡的读写

参考博客：

https://blog.csdn.net/husipeng86/article/details/52262070

参考上述博客中的程序，报错：ERROR : f_write returned 1写失败，又参考了以下博客：

https://blog.csdn.net/fanwenjieok/article/details/37693625

程序如下：

#include <string.h> #include "platform.h" #include "xparameters.h"  #include "xil_printf.h" #include "ff.h" #include "xdevcfg.h"  static FATFS fatfs;  int SD_Init() {     FRESULT rc;      rc = f_mount(&fatfs,"",0);     if(rc)     {         xil_printf("ERROR : f_mount returned %d\r\n",rc);         return XST_FAILURE;     }     return XST_SUCCESS; }  int SD_Transfer_read(char *FileName,u32 DestinationAddress,u32 ByteLength) {     FIL fil;     FRESULT rc;     UINT br;      rc = f_open(&fil,FileName,FA_READ);     if(rc)     {         xil_printf("ERROR : f_open returned %d\r\n",rc);         return XST_FAILURE;     }     rc = f_lseek(&fil, 0);     if(rc)     {         xil_printf("ERROR : f_lseek returned %d\r\n",rc);         return XST_FAILURE;     }     rc = f_read(&fil, (void*)DestinationAddress,ByteLength,&br);     if(rc)     {         xil_printf("ERROR : f_read returned %d\r\n",rc);         return XST_FAILURE;     }     rc = f_close(&fil);     if(rc)     {         xil_printf(" ERROR : f_close returned %d\r\n", rc);         return XST_FAILURE;     }     return XST_SUCCESS; }  int SD_Transfer_write(char *FileName,u32 SourceAddress,u32 ByteLength) {     FIL fil;     FRESULT rc;     UINT bw;      rc = f_open(&fil,FileName,FA_OPEN_ALWAYS | FA_WRITE);     if(rc)     {         xil_printf("ERROR : f_open returned %d\r\n",rc);         return XST_FAILURE;     }     rc = f_lseek(&fil, 0);     if(rc)     {         xil_printf("ERROR : f_lseek returned %d\r\n",rc);         return XST_FAILURE;     }     rc = f_write(&fil,(void*) SourceAddress,ByteLength,&bw);     if(rc)     {         xil_printf("ERROR : f_write returned %d\r\n", rc);         return XST_FAILURE;     }     rc = f_close(&fil);     if(rc){         xil_printf("ERROR : f_close returned %d\r\n",rc);         return XST_FAILURE;     }     return XST_SUCCESS; }  #define FILE "test.txt"  int main() {     init_platform();      const char src_str[] = "hsp test sd card write and read!";     u32 len = strlen(src_str);      SD_Init();     SD_Transfer_write(FILE,(u32)src_str,(len+1000));//当直接指定len时没有写出，需要指定较大的长度才会写出，原因未知      char dest_str[33];//len<=33     SD_Init();     SD_Transfer_read(FILE,(u32)dest_str,(len+1));      xil_printf("%s\r\n",dest_str);     print("SD write and read over!\r\n");      cleanup_platform();     return 0; }

上述程序可以把字符串写入SD卡的文档中，也可以读出，但还有一个错误，但不知道什么原因造成的！！！！！

另外可参考链接：

http://elm-chan.org/fsw/ff/00index_e.html

https://blog.csdn.net/mcupro/article/details/73694460

https://blog.csdn.net/love_ljq/article/details/79117738

文章来源: zynq7000 SD卡的读写