Tag: stm32

I had a working HDMI path at 12:48 in the morning. Then at 10am, well rested and full of hope, I picked up the tiny SPI screen instead and spent nine hours reinventing flicker. A note on patience, and on why hardware scanout is the thing I should have just waited for.

Getting the desktop off the USB stream and onto a real LCD. A dead-end controller that latches on the wrong clock edge, a switch to the ST7735, and climbing from 1 MHz to 25 MHz without losing the audio.

An I2S DAC, SAI plus DMA, and three gotchas that each ate a session: a mute pin nobody pulls high, a data cache fighting the DMA, and an async executor that starved the audio to silence.