144LQFP RT1020 SD card

[614678489]

I have 144LQFP RT1020 and the board, where to find the example code/project to use the SD card ?

I checked the MCUXpresso_IDE_User_Guide, but couldn't find the detailed information.

Thanks.

[khan9739321]

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[igorpadykov]

Hi Fun

MIMXRT1020 EVK has "AG" part 20 x 20 mm, 0.5 mm pitch, 144-pin LQFP

as described in datasheet https://www.nxp.com/docs/en/data-sheet/IMXRT1020CEC.pdf 

Design Support (1)
MIMXRT1020_EVK Design files
https://www.nxp.com/products/processors-and-microcontrollers/applications-processors/i.mx-applicatio...

One can look at MCUXpresso SDK examples for this board (../devices/MIMXRT021/drivers/fsl_usdhc.c)

Welcome | MCUXpresso SDK Builder 

Best regards
igor
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[614678489]

Thanks, we used the SD card example code and the FAT file system, but when reading/writing large files, there are a lot of errors, why ?

[igorpadykov]

issue may be related to signal noise (signal integrity), one can try to

improve signal shape by reducing sd operating frequency or tweaking

drive stregth od sd signals (like register IOMUXC_SW_PAD_CTL_PAD_GPIO_SD_*,

DSE - Drive Strength Field), please check Chapter 33 IOMUX Controller (IOMUXC)

i.MX RT1020 Processor Reference Manual
https://www.nxp.com/docs/en/reference-manual/IMXRT1020RM.pdf 

Best regards
igor