Hello,

I write a SDCard driver. The command-response managing seems to work well like shows the erase test. My problem is about writing into the SDCard. When i try to write a block about 512 bytes with a known value (0x42 for all bytes), a block with a good size is written at the good place but all bytes have the value 0x00. Do you know what it's mean?

Thank you.

maby the lines betwen mcu and sd are too long, try to reduce clock of hsmci peripheral

Hello kshysio,

the lines are about 2cm and i work with a 200kHz clock.

I try it with a lower speed

Thank you.

Hello,

i have the same problem with 100Khz speed.

Thank you.

hello,

do you use PDC or DMA in the write command?

if yes, is the source data placed in Flash?

if yes, PDC and DMA on all existing SAM7/3/4 don't allow reading from Flash.

in this case, remove your 'const' attribute to let the data array to be copied into SRAM during startup and it should work.