Hi,
I'm now trying to communicate with the microSD card on the MCBSTM32EXL Keil board in SD mode. I managed to communicatie in SPI mode by manually controlling the GPIO ports. But the onboard microSD card is directly connected to the micro controller's SDIO peripheral. This SDIO peripheral does not support SPI mode but it does support SD mode. So I studied the SD mode and configured all associated registers. At last the status register is stating that the 'command transmit is in progress' but the CMD or CLK ports do not show any activity on my oscilloscoop. I checked the i/o-pin alternate function settings thoroughly. No DMA is used to keep it simple...
What sequence of register settings do I need to make the i/o-pins get alive our what do I forget?
Thanks
Henk