AM2632: MMCSD_lld_transferPoll send and receive exceptions

feiyun su

Part Number: AM2632

Tool/software:

While transplanting SDIO-related content, it was found that the MMCSD_lld_transferPoll transmission and reception were abnormal.
The rspType is MMCSD_RSP_TYPE_LEN_48.
CMD refers to CMD2, CMD3, CMD5, CMD7, etc.
1、Before MMCSD_lld_transferPoll, a manual delay needs to be added; otherwise, the correct response cannot be obtained.
2、When using MMCSD_lld_transferPoll to send commands, after sending the command, if the logic analyzer shows that the other end has responded (without adding delay), the correct Response cannot be obtained. When the other end does not respond, MMCSD_lld_cmdCompleteStatusPoll does not return a timeout either. When there is no Response, what is obtained is either 0 or the last data.

4 days ago

0 QJ Wang 3 days ago

TI__Guru**** 196776 points

Hi Feiyun,

I did a test on SD card with AM263x SDK example project:

mmcsd_raw_io_sd_lld_am263x-cc_r5fss0-0_nortos_ti-arm-clang

The test passes.

0 feiyun su 3 days ago in reply to QJ Wang

Prodigy 50 points

The problems we encountered during the SDIO transplantation based on mmcsd_raw_io_sd_lld were that after configuring the bus and executing the command, there were issues.

0 QJ Wang 3 days ago in reply to feiyun su

TI__Guru**** 196776 points

What modifications have you made to the SDK example? Are you using MMC card, SD card, or SDIO card? I am running the test with an SD card on TI AM263x CC board.

0 feiyun su 2 days ago in reply to QJ Wang

Prodigy 50 points

Dear Sir，

we also conducted tests using the mmcsd_raw_io_sd_lld_am263x-lp_r5fss0-0_nortos_ti-arm-clang routine. We used a TF card and found that it also failed.

Version mcu_plus_sdk_am263x_10_02_00_13

0 QJ Wang 2 days ago in reply to feiyun su

TI__Guru**** 196776 points

Is TF card in your message a MicroSD card? I tested the example with a MicroSD card (SanDisk Edge 16GB), and the test passed.

Does adding a delay before MMCSD_lld_transferPoll() function call solve the issue?

0 feiyun su 1 day ago in reply to QJ Wang

Prodigy 50 points

My colleague tested the SanDisk product and it was fine. But when I tested the Kingston product, it didn't work.

0 QJ Wang 1 day ago in reply to feiyun su

TI__Guru**** 196776 points

Hi Feiyun,

I don't have a Kingston card for test. Can the delay before MMCSD_lld_transferPoll() solve the Kingston issue? If yes, how many ns or CPU clock cycles should be added?

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AM2632: MMCSD_lld_transferPoll send and receive exceptions