diff options
| author | Keith Packard <keithp@keithp.com> | 2012-07-17 20:44:55 -0700 |
|---|---|---|
| committer | Keith Packard <keithp@keithp.com> | 2012-07-17 20:44:55 -0700 |
| commit | b4be63627e146c7c868b5b3468d34880a561cfba (patch) | |
| tree | 5323d2b7882dcb8d1fced3a70fad61f84acaa1fb | |
| parent | 97c1cfee929a35dd1596dc02ce519b80132f3c5c (diff) | |
altos: Megametrum ADC values are 12 bits, discard low 4 for telemetry
We've only got space for 8 bits for the ADC values for pyro channels,
discard the low 4 bits instead of the low 8 bits.
Signed-off-by: Keith Packard <keithp@keithp.com>
| -rw-r--r-- | src/core/ao_telemetry.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/src/core/ao_telemetry.c b/src/core/ao_telemetry.c index 583a6636..52ac9489 100644 --- a/src/core/ao_telemetry.c +++ b/src/core/ao_telemetry.c @@ -138,9 +138,9 @@ ao_send_mega_data(void) telemetry.mega_data.v_batt = packet->adc.v_batt; telemetry.mega_data.v_pyro = packet->adc.v_pbatt; - /* XXX figure out right shift value; 4 might suffice */ + /* ADC range is 0-4095, so shift by four to save the high 8 bits */ for (i = 0; i < AO_ADC_NUM_SENSE; i++) - telemetry.mega_data.sense[i] = packet->adc.sense[i] >> 8; + telemetry.mega_data.sense[i] = packet->adc.sense[i] >> 4; telemetry.mega_data.ground_pres = ao_ground_pres; telemetry.mega_data.ground_accel = ao_ground_accel; |