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DMA transfer between ext. Memory to SDIO problem

Question asked by zhang.jeffrey on May 30, 2011
Latest reply on Jun 1, 2011 by zhang.jeffrey
Hi guys,

I am working on a customized board with STM32F103. I am using SDIO example from library (V3.4) but modified the memory addr to external memory addr. I got problem when DMA transfer data from external memory to SDIO fifo. the error is SD_Error 5, which is "SD_TX_UNDERRUN" according the defination of stm32_eval_sdio_sd.h.

Could anyone tell me what is wrong?
Thx.

JZ

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