SDIO power up

Time for a little update. SDIO code is ready and under testing, although that’s not exactly going according to plan. After sending CMD8 it times out and the fun is over. A little annoying problem, but interesting nonetheless. For example did you know what the D0 signal looks like directly after setting the power state to on? Now you do ;)

Notice the long power up / supply ramp up time and the voltage it stabilises at.

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