tried 2'c complement manual

afsk/main.c

@@ -120,9 +120,9 @@ struct SensorData read_sensor_data(struct SensorConfig sensor) {
 
     wiringPiI2CWrite(sensor.fd, INA219_REG_CURRENT);
     delay(1); // Max 12-bit conversion time is 586us per sample
-    int16_t valueC = (int16_t)((wiringPiI2CRead(sensor.fd) << 8 ) | wiringPiI2CRead (sensor.fd));		
-		
-    float valuec3  = (float)(valueC);
+    int valueC = ((wiringPiI2CRead(sensor.fd) << 8 ) | wiringPiI2CRead (sensor.fd));		
+    int twos = twosToInt(valueC, 16);	
+    float valuec3  = (float)(twos);
     data.current  = valuec3 / (float)sensor.currentDivider;
 	
 //    uint16_t value3 = (uint16_t)wireReadRegister(sensor.fd, INA219_REG_BUSVOLTAGE);