--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Small_CPU/Src/batteryGasGauge.c	Sat Apr 28 11:52:34 2018 +0200
@@ -0,0 +1,134 @@
+/**
+  ******************************************************************************
+  * @file    batteryGasGauge.c 
+  * @author  heinrichs weikamp gmbh
+  * @version V0.0.1
+  * @date    09-Dec-2014
+  * @brief   LTC2942 Battery Gas Gauge
+  *           
+  @verbatim                 
+  ============================================================================== 
+                ##### stm32f4xx_hal_i2c.c modification #####
+  ============================================================================== 
+	The LTC2942 requires an repeated start condition without stop condition
+	for data reception.
+	
+  @endverbatim
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; COPYRIGHT(c) 2014 heinrichs weikamp</center></h2>
+  *
+  ******************************************************************************
+  */ 
+/* Includes ------------------------------------------------------------------*/
+#include "batteryGasGauge.h"
+#include "baseCPU2.h"
+#include "stm32f4xx_hal.h"
+#include "i2c.h"
+
+float battery_f_voltage = 0;
+float battery_f_charge_percent = 0;
+
+#define BGG_BATTERY_OFFSET          (26123)  //; 65536-(3,35Ah/0,085mAh)
+#define BGG_BATTERY_DEVIDER         (394)    //; 3,35Ah/0,085mAh/100 [%]
+
+float get_voltage(void)
+{
+#ifdef OSTC_ON_DISCOVERY_HARDWARE
+	return 3.0f;
+#endif
+
+	return battery_f_voltage;
+}
+
+
+float get_charge(void)
+{
+	#ifdef OSTC_ON_DISCOVERY_HARDWARE
+		return 100.0f;
+	#endif
+	
+	return battery_f_charge_percent;
+}
+
+
+void init_battery_gas_gauge(void)
+{
+	#ifdef OSTC_ON_DISCOVERY_HARDWARE
+		return;
+	#endif
+	
+	uint8_t buffer[2];
+	buffer[0] = 0x01;
+	buffer[1] = 0xF8;// true: F8 = 11111000, wrong/old comment: 11101000
+	I2C_Master_Transmit(  DEVICE_BATTERYGAUGE, buffer, 2);
+}
+
+
+void battery_gas_gauge_get_data(void)
+{
+	#ifdef OSTC_ON_DISCOVERY_HARDWARE
+		return;
+	#endif
+	
+	float battery_f_voltage_local;
+	float battery_f_charge_percent_local;
+	
+	uint8_t bufferReceive[10];
+	I2C_Master_Receive(		DEVICE_BATTERYGAUGE, bufferReceive, 10);
+
+	battery_f_voltage_local =  (float)(bufferReceive[8] * 256);
+	battery_f_voltage_local += (float)(bufferReceive[9]);
+	battery_f_voltage_local *= (float)6 / (float)0xFFFF;
+
+	// max/full: 0.085 mAh * 1 * 65535 = 5570 mAh
+	battery_f_charge_percent_local =  (float)(bufferReceive[2] * 256);
+	battery_f_charge_percent_local += (float)(bufferReceive[3]);
+	battery_f_charge_percent_local -= BGG_BATTERY_OFFSET;
+	battery_f_charge_percent_local /= BGG_BATTERY_DEVIDER;
+	
+	if(battery_f_charge_percent_local < 0)
+		battery_f_charge_percent_local = 0;
+	
+	battery_f_voltage = battery_f_voltage_local;
+	battery_f_charge_percent = battery_f_charge_percent_local;
+}
+
+
+void battery_gas_gauge_set_charge_full(void)
+{
+	#ifdef OSTC_ON_DISCOVERY_HARDWARE
+		return;
+	#endif
+	
+	uint8_t bufferSend[3];
+	bufferSend[0] = 0x02;
+	bufferSend[1] = 0xFF;
+	bufferSend[2] = 0xFF;
+	I2C_Master_Transmit(  DEVICE_BATTERYGAUGE, bufferSend, 3);
+}
+
+
+void battery_gas_gauge_set(float percentage)
+{
+	#ifdef OSTC_ON_DISCOVERY_HARDWARE
+		return;
+	#endif
+
+	uint16_t mAhSend;
+	
+	if(percentage >= 100)
+		mAhSend = 0xFFFF;
+	else	
+		mAhSend = (uint16_t)(percentage * 655.35f);
+	
+	uint8_t bufferSend[3];
+	bufferSend[0] = 0x02;
+	bufferSend[1] = (uint8_t)(mAhSend / 256);
+	bufferSend[2] = (uint8_t)(mAhSend & 0xFF);
+	I2C_Master_Transmit(  DEVICE_BATTERYGAUGE, bufferSend, 3);
+}
+
+
+/************************ (C) COPYRIGHT heinrichs weikamp *****END OF FILE****/