USDHC

A microSD Active Object with QP/C and USDHC1 — and the Card-Detect Line That Lied

Building an SdCard active object on the i.MX RT1062: hardware card detect, the blocking-API problem that forces a worker task, and the coupled CD line that made detection fail unpredictably until I stopped trusting the interrupt.

i.MX RT1062 Pin Config: Pull/Keeper, Drive Strength and Slew Rate

What each IOMUXC pad-control field actually does, how to derive the right value from the schematic instead of trusting the config tool’s defaults, and the SD-card bug those defaults caused on my board.