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problem with long response in SDIO.

zeros_and_ones1991
Associate III

‎2013-08-04 1:32 AM

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??????

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zeros_and_ones1991
Associate III

‎2013-08-04 5:25 PM

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 .

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