How to fix error return by SDMMC_GetCmdResp1

[KPras.2]

Dear Sir,

I have interfaced SDHC card 32GB of Sandisk with STM32L452RET6 microcontroller SDMMC1 peripheral in mode - SD 4 bit wide bus. In my device SD card as a Datalogger.

Issue - When my device is working mean data is logging (Data writing in SD card). In this period i have cut SD CMD line and again connected.

In this period - function this SDMMC_GetCmdResp1 return a error.

In working condition - Which routine we have to call to fix this issue???

Please suggest solution for this issue.....

[AScha.3]

Hi,

>In this period i have cut SD CMD line and again connected. <

This means ...what ? you cut the trace ?

+

SDcard is working , mount , read dir , read file -> ok ?

[TDK]

I mean, if you're cutting traces, it's expected that an error will occur. Don't cut traces to prevent this from happening.

If the peripheral gets into a weird state, re-initialize it from the beginning. But you might not need to do anything. You may just need to re-send the command you want.

SDIO is fairly complicated. The specification has a nice flowchart for the internal state machine and what happens in various error scenarios. What happens will depend on what state it was in when CMD was cut.

[KPras.2]

Dear Sir,

Thanks for the reply.

Yes i have cut trace of the CMD line then it instant function returns error.

This procedure i am doing in debug mode. I have already place break point for the scanning of error. When debugger received error then its code of execution has stop. Then again i have reconnect the CMD trace. And reinitialize 

 MX_SDMMC1_SD_Init();
 MX_FATFS_Init();
 MX_SPI1_Init();  

MountSDCard (); 

i am doing re-initialization of the peripheral but SD card not becomes mount. It gives again error. Why it is not mount???