ADC voltage: battcheck 3 digits, fixed t1616, switched back to 8-bit internal volt unit

Before this branch, `voltage` was 6 bits: Volts * 10
A couple patches ago, I upgraded it to 16 bits: 65535 * Volts / 10.24
That costs too much extra ROM on attiny85 though, for extra precision
it doesn't even use... so I switched back to an 8-bit value.  It's still
more precise than before though: Volts * 40
... and battcheck displays an extra digit now, on devices with ROM for it.
... and battcheck waits a second to get a more accurate measurement
    before displaying the first value.  It has *much* less variation
    between first and later readings now.

Also:
- got t1616 builds working again (tested fc13 and thefreeman-boost-fwaa)
- upgraded t1616 voltage and temp to 12-bit (10 bits + 4x oversampling)
- removed expensive temp conversion from t1616 ADC interrupt
- recalibrated t1616 bogomips again; runs faster after interrupt fix
- increased t1616 internal VDD measurement resolution by 36% (1.5V Vref, not 1.1V)
- fixed sloppy setting of Vref bits

I still need to test / update other t1616 builds,
and fix all the t85 + t1634 code and build targets.

3 files changed, 22 insertions, 17 deletions

diff --git a/ui/anduril/anduril.c b/ui/anduril/anduril.c
index c434518..1cdb8d0 100644
--- a/ui/anduril/anduril.c
+++ b/ui/anduril/anduril.c
@@ -316,6 +316,7 @@ void loop() {
 
     #ifdef USE_BATTCHECK
     else if (state == battcheck_state) {
+        nice_delay_ms(1000);  // wait a moment for a more accurate reading
         battcheck();
         #ifdef USE_SIMPLE_UI
         // in simple mode, turn off after one readout
diff --git a/ui/anduril/aux-leds.c b/ui/anduril/aux-leds.c
index dce8d26..fd184fc 100644
--- a/ui/anduril/aux-leds.c
+++ b/ui/anduril/aux-leds.c
@@ -58,27 +58,27 @@ void indicator_led_update(uint8_t mode, uint8_t tick) {
 uint8_t voltage_to_rgb() {
     static const uint8_t levels[] = {
     // voltage, color
-          0, 0, // black
+           0, 0, // black
         #ifdef DUAL_VOLTAGE_FLOOR
         // AA / NiMH voltages
-          9, 1, // R
-         10, 2, // R+G
-         11, 3, //   G
-         12, 4, //   G+B
-         13, 5, //     B
-         14, 6, // R + B
-         16, 7, // R+G+B
-         20, 0, // black
+        4* 9, 1, // R
+        4*10, 2, // R+G
+        4*11, 3, //   G
+        4*12, 4, //   G+B
+        4*13, 5, //     B
+        4*14, 6, // R + B
+        4*16, 7, // R+G+B
+        4*20, 0, // black
         #endif
         // li-ion voltages
-         29, 1, // R
-         33, 2, // R+G
-         35, 3, //   G
-         37, 4, //   G+B
-         39, 5, //     B
-         41, 6, // R + B
-         44, 7, // R+G+B  // skip; looks too similar to G+B
-        255, 7, // R+G+B
+        4*29, 1, // R
+        4*33, 2, // R+G
+        4*35, 3, //   G
+        4*37, 4, //   G+B
+        4*39, 5, //     B
+        4*41, 6, // R + B
+        4*44, 7, // R+G+B  // skip; looks too similar to G+B
+         255, 7, // R+G+B
     };
     uint8_t volts = voltage;
     //if (volts < VOLTAGE_LOW) return 0;
diff --git a/ui/anduril/config-default.h b/ui/anduril/config-default.h
index cd25b52..1b34e8c 100644
--- a/ui/anduril/config-default.h
+++ b/ui/anduril/config-default.h
@@ -143,6 +143,10 @@
 #define BATTCHECK_VpT
 //#define BATTCHECK_8bars  // FIXME: breaks build
 //#define BATTCHECK_4bars  // FIXME: breaks build
+#if ROM_SIZE > 10000
+    // battcheck displays 1.25V instead of 1.2V
+    #define USE_EXTRA_BATTCHECK_DIGIT
+#endif
 // allow the user to calibrate the voltage readings?
 // (adjust in 0.05V increments from -0.30V to +0.30V)
 // (1 = -0.30V, 2 = -0.25V, ... 7 = 0V, ... 13 = +0.30V)