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SPI interface to MMC card

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pepillo

pepillo

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Hi I am interfacing a PIC to an MMC through bit-banging SPI, I think all the signals are correct on my interface according to what I see on the oscilloscope, but the MMC never sends any response back on the MOSI line...

I send the Reset command according to this timing diagram but don´t get any answer on the MOSI line.
**broken link removed**

I have measured the frequency on the SPI, it´s 135KHz. Also the clock and data polarity I think it´s ok, voltage levels are correct at 3.3V...

Any ideas on what can be happening?
Thx
 

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