problem with detecting SD card using 'periph_sdmmc' and 'app_sdmmc_meas' examples

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problem with detecting SD card using 'periph_sdmmc' and 'app_sdmmc_meas' examples

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Contributor I

Hi there,

I am the happy owner of the EA1788 board. My simple project is to build a web page where I will be able to upload a file to an SD card which I put into the slot on EA1788 board.

The setup includes 1GB MicroSD in adapter and half of the LPC1769 board: LPC1769 LPCXpresso Board | Embedded Artists AB as a debugger.

I started by examining the LPCOpen 'periph_sdmmc' and 'app_sdmmc_meas' examples which are those dedicated to LPC1788.

The first example describes how to use the SD/MMC interface with an SD card and an FATFS filesystem

and the second measures the performance of SD/MMC raw read & write operations.

Everything should work but it doesn't. 

In my opinion, the SD card is not detected.

I went through the forums and what I found is not quite helpful:

https://www.lpcware.com/content/forum/helpregarding-initialisation-sd-card-and-filesystem-cmsis-lpc1...

https://community.nxp.com/thread/422375

I tried with FAT16 and FAT32 turning DMA on and off.

Could anybody help me with the issue, please?

Greg

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NXP Employee
NXP Employee

Hi,

Could you please check known issues listed in the NXP LPCOpen LPC17xx Release Notes:

http://www.nxp.com/assets/documents/data/en/release-notes/LPC17XX-RN.pdf 

"Example periph_sdmmc intermittently fails with ‘Card Acquire failed’ errors on LPC1788 when pressing the reset button. Seems to work OK when running from the debugger."


Have a great day,
Sol

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