topic Re: Problem to use USDHC2 with fatfs_sdcard exemple in i.MX RT Crossover MCUs

Problem to use USDHC2 with fatfs_sdcard exemple

lacouturepatric — Mon, 09 Mar 2020 16:48:47 GMT

Hello,

I have design a board that includes :

- a MIMXRT1064DVL6A processor,
- Memory IS42s16160j,
- 2 SD card slot (USDHC1 and USDHC2)
- JTAG,
- A led,

I am trying to test the SD card slot 1 and slot 2.

I am using "the fat" exemple to init and configure the USDHC and to do a "f_mkdir".

Test on slot 1: I succeed to init and configure USDHC1 and to create the directory "dir_1' into a SDcard from slot 1.

Test on slot 2: I have the code error = 6502 during the "f_mkdir" called. The error
appears from SD_SendInterfaceCondition function.

I modified the following functions :

- sdcardWaitCardInsert_SD2() : to take USDHC2 base address
g_sd.host.base = MMC_HOST_BASEADDR;
g_sd.host.sourceClock_Hz = MMC_HOST_CLK_FREQ;

- BOARD_InitPinsSD2() : to init Pins SD2 card
- BOARD_USDHC2ClockConfiguration : to configure the USDHC2Clock.

Do you think I forgot a configuration to use USDHC2 instead of USDHC1?

Please find attached my modified code (fatfs_sdcard.c and pin_mux).

Thank you for your help.
Best Regards,
Patrice

Re: Problem to use USDHC2 with fatfs_sdcard exemple

jeremyzhou — Wed, 11 Mar 2020 03:59:52 GMT

Hi Patrice,

Thank you for your interest in NXP Semiconductor products and
for the opportunity to serve you.
After having a brief review of the code, I've not found any errors in them.
So I suspect that it may be related to the hardware circuit, I'd highly recommend you to modify the sdcard_polling or sdcard_interrupt to test the USDHC2, as software architecture of these demo projects is more simple and close to the hardware layer, please give a try.

Have a great day,
TIC

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Re: Problem to use USDHC2 with fatfs_sdcard exemple

lacouturepatric — Wed, 11 Mar 2020 09:35:34 GMT

Hello,
Thank you for your answer, I found where the problem is.
In pin_mux.c, I should set pin mux at the address IOMUXC_GPIO_SD_B1_04_USDHC2_CLK instead of IOMUXC_GPIO_AD_B1_09_USDHC2_CLK (BOARD_InitPinsSD2 function).

I have not now the error 6502 but I have another problem. When I try to switch voltage at 1.8V (SD_ProbeBusVoltage), I have the error kStatus_SDMMC_SwitchVoltageFail.

In fact, my switch GPIO is GPIO_B1_14, configured as IOMUXC_GPIO_B1_14_USDHC1_VSELECT.
It enables to switch the voltage for USDHC1 well but not USDHC2.

In my design, I use the same regulator for NVCC_SD0 and NVCC_SD1 with the command GPIO_B1_14.

Can I use GPIO_B1_14 as VSELECT for USDHC2?
If yes, how?

Thank you,

Regards
Patrice

Re: Problem to use USDHC2 with fatfs_sdcard exemple

jeremyzhou — Thu, 12 Mar 2020 04:08:14 GMT

Hi Lacouture Patrice,

Thanks for your reply.
I think you should use the GPIO_EMC_38 pin as the USDHC2_VSELECT if you want to port the same voltage switch mechanism from the USDHC1 to USDHC2.

Have a great day,
TIC

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Re: Problem to use USDHC2 with fatfs_sdcard exemple

lacouturepatric — Thu, 12 Mar 2020 10:24:41 GMT

Hello,
Thank you for your answer.

My board is already built, I have no possbility to connect GPIO_EMC_38 to the switch and this pin is used by the memory (SEMC_DM1).

I found the possibility to use GPIO_B1_14 pin as GPIO instead of USDHC1_VSELECT to set NVCC_SD1 at 1.8V (NVCC_SD0 and NVCC_SD1 are powered with USDHC1_VSELECT).

In the DMMC_SwitchToVoltage(fsl_sdmmc_common) function, I do a GPIO_PinWrite(GPIO2, 30U, 1U) instead of SDMMCHOST_SWITCH_VOLTAGE180V(base, true);

It works, the NVCC_SD1 is well at 1.8V but I have a kStatus_SDMMC_SwitchBusTimingFailed error in SD_CardInit function.

If I put in comment the error (line 1885, fsl-sd.c) and if I use the GPIO, the directory is created without error but at 50MHz clock rate.

Do you think there are other solutions than using USDHC1_VSELECT as GPIO or using GPIO_EMC_38?

Best regards,
Patrice

PS : This is the same with Test_sd_polling exemple.

Re: Problem to use USDHC2 with fatfs_sdcard exemple

lacouturepatric — Thu, 12 Mar 2020 12:58:54 GMT

Do you know why I have kStatus_SDMMC_SwitchBusTimingFailed error with USDHC2?

I have not with USDHC1 when I use GPIO_B1_14 pin as GPIO.

Re: Problem to use USDHC2 with fatfs_sdcard exemple

jeremyzhou — Fri, 13 Mar 2020 11:54:06 GMT

Hi Lacouture Patrice,

Thanks for your reply.
1) Do you know why I have kStatus_SDMMC_SwitchBusTimingFailed error with USDHC2?
-- I think it's related to the switch voltage sequence, whether you can tell the what response of the SD_SwitchVoltage(card) function.

Have a great day,
TIC

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