LPC MicrocontrollersのトピックRe: sd-card read hang in USB composite mass storage

sd-card read hang in USB composite mass storage

bobv — Sun, 21 Aug 2016 08:53:25 GMT

Hi,

I am new to the lpc platform. I am trying to build a usb composite device with VCOM and MSC (storage over sd-card). I am using a NGX Xplorer 1830. I modified the usbd_rom_dfu_composite example, by adding the sd-card initialization routine into main(), and modified translate_rd and translate_wr with read and write from sd-card.

However, I notice that the device hangs during read from the card:

static void sd_rd(uint32_t@ offset, uint8_t * *buff_adr, uint32_t length, uint32_t hi_offset)

{

// only using offset, access limited to <~ 4GB

int x;

Board_LED_Set(1,1);

x = FSMCI_CardReadSectors(0,verifyBuff,offset/sdSectorSize,length/sdSectorSize);

Board_LED_Toggle(1);

*buff_adr = verifyBuff;

}

Although, the read works fine during initialisation.

The project with lpc-xpresso is attached.

Any help will be greatly appreciated

Original Attachment has been moved to: pd_project_bad.tar.7z.zip

Re: sd-card read hang in USB composite mass storage

Hui_Ma — Wed, 07 Sep 2016 05:35:49 GMT

I recommend just remove below code from main() and ms_timerDelay() functions to check if SD card read works or not.

__WFI();

Wish it helps.

Have a great day,
Ma Hui
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

Re: sd-card read hang in USB composite mass storage

bobv — Fri, 09 Sep 2016 05:18:03 GMT

The problem is now solved. I set a higher interrupt priority for the sd card than the USB.