sl-firmware
e21526327b
Shared I2C1 bus (i2c1.c/h, PB8=SCL PB9=SDA 100kHz): - i2c1_init() called once in main() before sensor probes. - hi2c1 exported globally; baro and mag drivers use it directly. Barometer (bmp280.c): - Probes I2C1 at 0x76 then 0x77 (covers both SDO options). - bmp280_init() returns chip_id (0x58/0x60) on success, neg if absent. - Added bmp280_pressure_to_alt_cm() — ISA barometric formula. - Added bmp280.h (was missing). Magnetometer (mag.c / mag.h): - Auto-detects QMC5883L (0x0D, id=0xFF), HMC5883L (0x1E, id='H43'), IST8310 (0x0E, id=0x10) in that order. - mag_read_heading() returns degrees×10 (0–3599) or -1 if not ready. - HMC5883L: correct XZY byte order applied. - IST8310: single-measurement trigger mode. main.c: - i2c1_init() + bmp280_init() + mag_init() after all other inits. - Both skip gracefully (baro_ok=0, mag_type=MAG_NONE) if not present. - Telemetry JSON: incremental builder appends ",\"hd\":<n>" when mag found and ",\"alt\":<n>" when baro found. No extra bytes when absent. UI (index.html): - HEADING and ALT rows hidden until first packet with that field. - Heading shown in degrees, alt in metres (firmware sends cm). Closes #24. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>