From b4be63627e146c7c868b5b3468d34880a561cfba Mon Sep 17 00:00:00 2001 From: Keith Packard Date: Tue, 17 Jul 2012 20:44:55 -0700 Subject: [PATCH] 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 --- src/core/ao_telemetry.c | 4 ++-- 1 file 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; -- 2.30.2