altoslib: Support TeleBT v3.0 battery voltage conversion

TeleBT v3.0 uses an STM32 instead of a cc1111, so it needs a different
voltage computation from the raw ADC value.

Signed-off-by: Keith Packard <keithp@keithp.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/altoslib/AltosConvert.java b/altoslib/AltosConvert.java
index 5750afad..3e0f0e1a 100644
--- a/altoslib/AltosConvert.java
+++ b/altoslib/AltosConvert.java
@@ -230,6 +230,12 @@ public class AltosConvert {
 		return sensor / 32767.0 * supply * (5.6 + 10.0) / 10.0;
 	}
 
+	static double tele_bt_3_battery(int raw) {
+		if (raw == AltosLib.MISSING)
+			return AltosLib.MISSING;
+		return 3.3 * mega_adc(raw) * (5.1 + 10.0) / 10.0;
+	}
+
 	static double easy_mini_voltage(int sensor, int serial) {
 		double	supply = 3.3;
 		double	diode_offset = 0.0;