80MHz SPI + immediate display_fill_rect in init caused RTC_SW_CPU_RST
boot loop. Revert to 40MHz and let hud_task handle first draw.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- gc9a01.c/h: GC9A01 240x240 round LCD SPI driver (SPI2, GPIO 9-14)
5x7 bitmap font with scaling, display_fill_rect/draw_string/draw_arc
- main.c: hud_task — "SAULT" orange header (scale=3) + battery voltage
white on black (scale=4), updates at 1 Hz from g_vesc[0].voltage_x10
- config.h: add DISP_* GPIO defines; revert 06219af UART regression —
lsusb on Orin confirms /dev/ttyACM0 = CH343 (1a86:55d3) wired to
GPIO 43/44, not native USB; UART must stay on 43/44, CAN stays on 2/1
(SN65HVD230 physical rewire to GPIO 2/1 still required for CAN to work)
- CMakeLists.txt: add gc9a01.c
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
