X-Git-Url: https://www.fi.muni.cz/~kas/git//home/kas/public_html/git/?p=bike-lights.git;a=blobdiff_plain;f=firmware%2Fbattery.c;fp=firmware%2Fbattery.c;h=284c096b34230b38f53702539d6ed4792f901dcb;hp=472c1c47f099093c59bfe6454983276687e9dad8;hb=b0e6a5b47836a04116631e3a5427b8a508fc5cbf;hpb=320b394fa14a973bcb68fcbd2af65a79462e30bc

diff --git a/firmware/battery.c b/firmware/battery.c
index 472c1c4..284c096 100644
--- a/firmware/battery.c
+++ b/firmware/battery.c
@@ -3,9 +3,14 @@
 #include "lights.h"
 
 #define RESISTOR_HI	1500	// kOhm
-#define RESISTOR_LO	 150	// kOhm
+#define RESISTOR_LO	 100	// kOhm
 
-volatile unsigned char battery_100mv;
+volatile unsigned char battery_100mv = 0;
+
+void init_battery()
+{
+	battery_100mv = 0;
+}
 
 void battery_adc(uint16_t adcval)
 {
@@ -18,7 +23,7 @@ void battery_adc(uint16_t adcval)
 	 * is coarse (0.1 V).
 	 */
 	battery_100mv = (unsigned char)
-		((adcval * 11                              // 1.1V
+		((uint16_t)(adcval * 11                              // 1.1V
 		* (RESISTOR_HI+RESISTOR_LO)/RESISTOR_LO    // resistor ratio
 		/ 4) >> 8);                                // divide by 1024
 }