problem with long response in SDIO.

[zeros_and_ones1991]

Posted on August 04, 2013 at 10:32

Hullo guys , i have my own SD library working fine , but the problem is that i can not detect the card capacity because according to the datasheet (of STM32F2XX) ...... SD cards do not return long responses . so when i send CMD9 (SEND_CSD) , and wait for long response ....... it returns timeout error ...... any idea??????

[zeros_and_ones1991]

Posted on August 05, 2013 at 02:25

solved ....... the SEND_CSD command (CMD9) has to be sent before selecting the card for Read and Write operations ..... i,e directly after assigning an RCA .