部分 SD 卡写入失败（CMD24 返回 CRC 错误）

Question

I'm using a PIC18 to write to SD cards via SPI. For many cards, this is working file BUT for some cards I pass the init process but when trying to write to the card, CMD24 returns 0x05 (which I believe is a CRC error)

// send CMD24 - preparing for a 512 byte block
SD_command(CMD24, 0x0001, CMD24_CRC);
    
// read response
res1 = SD_readRes1();  //This returns 0x05 for some cards!

I have used CMD59 - CRC_ON_OFF with parameter 0x00 to turn of CRC, and the command seems to complete. Is there something I am missing?

Answer 1

I read a comment of someone on a forum, who spent one week looking for an error in this code. In his case, he found that with some sd cards, he has to put a valid crc in the sd command, whatever the state of crc check option (cmd59). Maybe it is simpler to put a valid crc in all cases.