mini_desktop — GEC6818 Desktop System

800×480 framebuffer + touch desktop with photo album and IR remote control.

Architecture

desktop → album     (swipe photo browser)
        → ir_app    (learn / send / receive IR codes)

Non-blocking I/O pattern

All I/O uses O_NONBLOCK + drain-events-into-cache. Never block on read().

Touch events are drained per-frame via ts_read() — after the while(ts_read > 0) loop exits (no more events), remaining logic (serial polling, etc.) runs once, then the outer loop repeats. This keeps the UI responsive to both touch and serial.

Do NOT let `ts_read()` return 1 with stale data

ts_read() uses a static int has_new flag. It MUST be reset to 0 at the top of every call. If you forget this, has_new sticks at 1 after the first touch, every ts_read() call returns 1 forever, and while (ts_read(...) > 0) loops spin endlessly — code after the loop is never reached. This bit us when page_learn() could never read from the IR serial port.

Build

docker run --platform linux/amd64 --rm \
  -v /path/to/toolchain:/opt/gec6818-toolchain:ro \
  -v /path/to/mini_desktop:/work -w /work \
  gec6818-dev:ubuntu18 bash -c 'make static'

Deploy

ssh root@192.168.1.88 'killall mini_desktop 2>/dev/null; sleep 1'
scp -O mini_desktop root@192.168.1.88:/home/cyy/

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