From 005dc0b3e5e0ce6351739daf519a59abc7872385 Mon Sep 17 00:00:00 2001
From: Mike Hojnowski <kd2eat@gmail.com>
Date: Wed, 3 Jan 2024 05:13:43 -0500
Subject: [PATCH] Modified formula for voltage calculation on dfm17 (#81)

---
 src/hal/system.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/hal/system.c b/src/hal/system.c
index 152f69f..ced3bcf 100644
--- a/src/hal/system.c
+++ b/src/hal/system.c
@@ -211,7 +211,14 @@ static void dma_adc_init()
 
 uint16_t system_get_battery_voltage_millivolts()
 {
+#ifdef RS41
     return (uint16_t) (((float) dma_buffer_adc[0]) * 10.0f * 600.0f / 4096.0f);
+#else  //DFM17
+    // Kludge:  DFM17 voltage is more than 5 volts, so cut the value in half.
+    // Changed 600 to 690 to try and get it more accurate to actual voltage
+    // 690 yields fairly linear, accurate results between 5v6 and 6v6
+    return (uint16_t) ( ((float) dma_buffer_adc[0]) * 10.0f * 690.0f / 8192.0f );
+#endif 
 }
 
 uint16_t system_get_button_adc_value()