On the BF512F, I see that SPI1 and the RSI interface share pins. Is it possible to use them both at the same time?
In BF51x processors only few (DATA4 -DATA7) lines of RSI are multiplexed with SPI1. But it should be possible to use the RSI and SPI1 together as long as you do not need to use DATA4 -DATA7 lines of RSI. This is possible in the case of SD card as SD card has only 4 DATA lines so DATA4 -DATA7 lines are not used by RSI in that case. Also in case of MMC card which has eight data lines, RSI can be used if MMC is configured in 1-bit mode.
Hope it helps.
That's great, you're right, I don't need the MMC card, so this will work out fine.
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