- bmp280.c: detect BME280 (chip_id 0x60) vs BMP280 (0x58) at init
- bmp280.c: read humidity calibration (dig_H1–H6) from 0xA1 and 0xE1–0xE7
- bmp280.c: set ctrl_hum (0xF2, osrs_h=×16) before ctrl_meas — hardware req
- bmp280.c: add bmp280_read_humidity() — float compensation (FPv5-SP FPU),
returns %RH × 10; -1 if chip is BMP280 or not initialised
- bmp280.h: add bmp280_read_humidity() declaration + timeout note
- main.c: baro_ok → baro_chip (stores chip_id for BME280 detection)
- main.c: telemetry adds t (°C×10), pa (hPa×10) for all barometers;
adds h (%RH×10) for BME280 only; alt unchanged
- ui/index.html: hidden TEMP/HUMIDITY/PRESSURE rows, revealed on first
packet containing t/h/pa fields; values shown with 1 dp
I2C hang safety: all HAL_I2C_Mem_Read/Write use 100ms timeouts, so
missing hardware (NAK) returns in <1ms, not after a hang.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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>
The MAMBA F722S mounts MPU6000 at CW270 (clockwise 270°) which applies
rotation matrix R = [[0,1,0],[-1,0,0],[0,0,1]] to transform sensor axes
to board axes (Betaflight convention).
Firmware (mpu6000.c):
- accel_pitch: was atan2(ax, az) → now atan2(ay, az)
board_forward = sensor_Y, so ay drives pitch not ax
- accel_roll: was atan2(ay, az) → now atan2(-ax, az)
board_right = -sensor_X, so -ax drives roll not ay
- gyro_pitch_rate: was +raw.gx → now -raw.gx
board_gy (pitch) = -sensor_gx after R_CW270 transform
- gyro_roll_rate: raw.gy unchanged (board_gx = sensor_gy ✓)
- gyro_yaw_rate: raw.gz unchanged ✓
UI (index.html) rotation sign fixes:
- roll → -rotation.z: Three.js +z = CCW from camera = left bank;
our convention is right-bank-positive so negate
- yaw → -rotation.y: Three.js +y = CCW from above; sensor_Z points
down on MAMBA (az ≈ +1g when level) so gz+ = CW physical; negate
- pitch → +rotation.x: correct as-is (Three.js +x tilts nose up ✓)
Closes#15.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Issue #12 — Roll displayed as pitch:
- Firmware was sending r=pitch_rate (wrong). Changed to r=roll_deg*10.
- mpu6000.c: add roll complementary filter (accel atan2(ay,az) +
gyro gy integration, same COMP_ALPHA=0.98 as pitch).
- IMUData: add roll and yaw fields.
- UI: updateIMU() now uses data.r/10 for roll (not client-side filter
that computed from ax/ay/az which firmware never sent).
- Three.js: roll -> rotation.z (banking), pitch -> rotation.x (tipping)
— axes were already correct, fix was the firmware data.
Issue #13 — Add yaw telemetry:
- Firmware: gyro Z integration (gz * dt) → s_yaw, sent as y=yaw_deg*10.
Gyro-only, drifts — no magnetometer.
- IMUData: yaw field added.
- UI: yaw -> rotation.y (spinning on vertical axis). Displayed in HUD.
- UI: YAW RESET button captures current yaw as new zero reference
(client-side offset, no new firmware command needed).
Closes#12, #13.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
