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SD卡命令响应超时
- 2021-06-14
示波器显示CLK和CMD都是有信号的，程序时使用的野火的SD卡例程， errorstatus = CmdResp7Error();初始化时这个检测出错，响应命令超时
SD卡命令响应超时
- 2021-06-14
static SD_Error CmdResp7Error(void) { SD_Error errorstatus = SD_OK; uint32_t status; uint32_t timeout = SDIO_CMD0TIMEOUT; status = SDIO->STA; while (!(status & (SDIO_FLAG_CCRCFAIL | SDIO_FLAG_CMDREND | SDIO_FLAG_CTIMEOUT)) && (timeout > 0)) { timeout--; status = SDIO->STA; } if ((timeout == 0) || (status & SDIO_FLAG_CTIMEOUT)) { /@@*!< Card is not V2.0 complient or card does not support the set voltage range */ errorstatus = SD_CMD_RSP_TIMEOUT; SDIO_ClearFlag(SDIO_FLAG_CTIMEOUT); return(errorstatus); } if (status & SDIO_FLAG_CMDREND) { /@@*!< Card is SD V2.0 compliant */ errorstatus = SD_OK; SDIO_ClearFlag(SDIO_FLAG_CMDREND); return(errorstatus); } return(errorstatus); }