lilieboy 发表于 2011-8-5 11:34:12

SD卡可以初始化，却读不出来数据，求解

send acmd41
send cmd55
send acmd41
send cmd55
send acmd41
send cmd55
send acmd41
send cmd55
send acmd41
send cmd55
send acmd41
send cmd55
send acmd41
send cmd55
send acmd41
send cmd55
send acmd41
send cmd55
send acmd41
send cmd55
send acmd41
send cmd55
send acmd41
send cmd2
SD_card_init success
Find SD card.
send cmd0
send cmd55
send acmd41
send cmd55
send acmd41
send cmd2
SD_card_init success
the partition type is not supported.
SD card mount fail.

最前面的省略了，因为都是那两个命令

lilieboy 发表于 2011-8-5 11:35:36

#include <stdio.h>
#include "my_includes.h"
#include "my_types.h"
#include "FatFileSystem.h"// FAT16 lib
#include "SDCardDriver.h"   // SDCard HAL
#include "bitmap.h"         // bmp lib

#define WAITING_SEC 5
// bmp file list parameterbmp文件列表参数
#define MAX_FILE_NUM 128// maximum file number in file list
#define FILENAME_LEN 32   // length of file name

typedef struct {
intfilenum;
char filename;
} BmpFileList;

static BmpFileList bmp_file_list;

// bmp parameter bmp参数
#define BMP_WIDTH 800
#define BMP_HEIGHT 480
#define BMP_RGB_OFST 54
#define NUM_RGB 3
#define OFST_R 2
#define OFST_G 1
#define OFST_B 0

// wait sdcard insert into socket
void wait_sdcard_insert(void) {
bool bFirstTime2Detect = TRUE;

while(!SD_card_init()) {
    if (bFirstTime2Detect){
      printf("Please insert SD card.\n");
      bFirstTime2Detect = FALSE;
    }
}

printf("Find SD card.\n");
}

// build bmp file list
int build_bmp_play_list(void) {
int filecnt = 0;                   // number of bmp
FAT_BROWSE_HANDLE hFileBrowse;   // FAT browse handle
FAT_DIRECTORY Directory;         // FAT directory
FAT_FILE_HANDLE hFile;             // FAT file handle
alt_u8 header;
char filename;

bmp_file_list.filenum = 0;

// FatFileSystem.h
if (!Fat_FileBrowseBegin(&hFileBrowse)){
    printf("browse file fail.\n");
    return 0;
}

// FatFileSystem.h
while (Fat_FileBrowseNext(&hFileBrowse, &Directory)) {
    // only bmp in file list
    if (strncmpi(Directory.Extension, "BMP", 3))
      continue;
   
    // compose filename
    Fat_ComposeFilename(&Directory, filename);

    // fopen() (FatFileSystem.h)
    if (!Fat_FileOpen(&hFile, filename)) {
      printf("bmp file open fail.\n");
      continue;
    }

    // fread() (FatFileSystem.h)
    if (!Fat_FileRead(&hFile, header, sizeof(header))) {
      printf("bmp file read fail.\n");
      continue;
    }

    // fclose() (FatFileSystem.h)
    Fat_FileClose(&hFile);
      
    // convert to bmp header (bitmap.h)
    BitmapHeader *bmp_header = get_bmp_header(header);

    // check valid bmp format
    if (!chk_valid_bmp(bmp_header)) {
      printf("%s is invalid bmp for DE2-70 LTM.\n", filename);
      continue;
    }

    // copy filename into file list      
    strcpy(bmp_file_list.filename, filename);
    filecnt++;
} // while
   
bmp_file_list.filenum = filecnt;

return filecnt;
}

// play bmp by filename
bool play_bmp(char *filename){
FAT_FILE_HANDLE hFile; // FAT file handle

// fopen() (FatFileSystem.h)
if (!Fat_FileOpen(&hFile, filename)){
    printf("Fat_FileOpen fail.\n");
    return FALSE;
}

printf("BMP file name is %s.\n", filename);

if (!Fat_FileSeek(&hFile, FILE_SEEK_BEGIN, BMP_RGB_OFST)) {
    printf("Fat_FileSeek fail.\n");
    return FALSE;
}
   
// bmp RGB array   
alt_u8 buff_bmp;

// fread() (FatFileSystem.h)
if (!Fat_FileRead(&hFile, buff_bmp, sizeof(buff_bmp))) {
    printf("Fat_FileRead fail.\n");
    return FALSE;
}
      
// move to sdram frame buffer//
int x, y;
for(x=0; x < BMP_WIDTH; x++) {
for(y=0; y < BMP_HEIGHT; y++) {
      // get RGB
      int r = buff_bmp[(y * BMP_WIDTH + x) * NUM_RGB + OFST_R];
      int g = buff_bmp[(y * BMP_WIDTH + x) * NUM_RGB + OFST_G];
      int b = buff_bmp[(y * BMP_WIDTH + x) * NUM_RGB + OFST_B];


    }
}
               
printf("Finsh reading FAT16\n");
// file close
Fat_FileClose(&hFile);

return TRUE;
}

int main() {
int play_index = 0;
alt_u8 filename;

// check SD card
wait_sdcard_insert();

// Mount SD-CARD
if (!Fat_Mount(FAT_SD_CARD)) {
    printf("SD card mount fail.\n");
    return -1;
}

// build wave list in gWavePlayList
if (build_bmp_play_list() == 0) {
    printf("There is no bmp file in the root directory of SD card.\n");
    return -1;
}

while(1) {
    strcpy(filename, bmp_file_list.filename);
   
    if (!play_bmp(filename)){
      printf("bmp play fail.\n");
      return -1;
    }
      
    play_index++;
   
    // repeat
    if (play_index >= bmp_file_list.filenum)
      play_index = 0;

    // waiting 5 sec between bmp
    printf("Waiting %d sec...\n", WAITING_SEC);   
    usleep(WAITING_SEC * 1000 * 1000);
}

return 0;
}

lilieboy 发表于 2011-8-5 11:36:44

main文件是别人做液晶屏显示图片的，那段忽略了，只要求能读取sd就行

lilieboy 发表于 2011-8-5 13:52:15

发现这个只能读2G的卡~

lilieboy 发表于 2011-8-9 16:54:17

果断沉掉了啊~
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