battery.c: priority of operations

... in order to fit to an 8-bit value.

diff --git a/firmware/battery.c b/firmware/battery.c
index 284c096b34230b38f53702539d6ed4792f901dcb..01337db1bb8c196fde0d0ff3efa61b1457bce7a8 100644 (file)
--- a/firmware/battery.c
+++ b/firmware/battery.c
@@ -23,8 +23,8 @@ void battery_adc(uint16_t adcval)
         * is coarse (0.1 V).
         */
        battery_100mv = (unsigned char)
-               ((uint16_t)(adcval * 11                              // 1.1V
+               ((uint16_t)(adcval * (11                   // 1.1V
                * (RESISTOR_HI+RESISTOR_LO)/RESISTOR_LO    // resistor ratio
-               / 4) >> 8);                                // divide by 1024
+               / 4)) >> 8);                               // divide by 1024
 }