view Small_CPU/Src/batteryGasGauge.c @ 595:fd0b60dee6f3

Bugfix Selection of primary view: At the begin of the dive and while switching between T7 <=> T3 view a primary view could be shown which was deactivated by the selection dialog. In case the primary view is now deactivated, the next activated view will be shown instead
author Ideenmodellierer
date Mon, 04 Jan 2021 21:32:39 +0100
parents aa286a4926c2
children 1b995079c045
line wrap: on
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/**
  ******************************************************************************
  * @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 <string.h>	/* memset */
#include "batteryGasGauge.h"
#include "baseCPU2.h"
#include "stm32f4xx_hal.h"
#include "i2c.h"

static float battery_f_voltage = 6.0;		/* max assumed voltage */
static float battery_f_charge_percent = 0;

#define BGG_BATTERY_OFFSET          (26123)  //; 65536-(3,35Ah/0,085mAh)
#define BGG_BATTERY_DIVIDER         (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;

	// F8 = 11111000:
	// ADC auto mode (11)
	// Prescale M = 128 (111)
	// AL/CC pin disable (0)
	// Shutdown (0)
	buffer[1] = 0xF8;
	I2C_Master_Transmit(DEVICE_BATTERYGAUGE, buffer, 2);
}

uint8_t battery_gas_gauge_CheckConfigOK(void)
{
	#ifdef OSTC_ON_DISCOVERY_HARDWARE
		return;
	#endif

	uint8_t retval = 0;
	uint8_t bufferReceive[10];

	memset(bufferReceive,0,sizeof(bufferReceive));

	I2C_Master_Receive(DEVICE_BATTERYGAUGE, bufferReceive, 10);
	if(bufferReceive[1] == 0xf8)
	{
		retval = 1;
	}
	return retval;
}

static void disable_adc(void)
{
	uint8_t buffer[2];
	buffer[0] = 0x01;

	// according to the datasheet of the LTC2942, the adc shall
	// be disabled when writing to the gauge registers

	// 0xF9 = 11111001:
	// see init_battery_gas_gauge()
	// Shutdown (1)
	buffer[1] = 0xF9;
	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];
	
	if(I2C_Master_Receive(DEVICE_BATTERYGAUGE, bufferReceive, 10) == HAL_OK)
	{
		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;		/* Because of the prescalar 128 the counter assumes a max value of 5570mAh => normalize to 3350mAh*/
		battery_f_charge_percent_local /= BGG_BATTERY_DIVIDER;		/* transform to percentage */

		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)
{
	disable_adc();
	#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);
	init_battery_gas_gauge();
}


void battery_gas_gauge_set(float percentage)
{

	disable_adc();
	#ifdef OSTC_ON_DISCOVERY_HARDWARE
		return;
	#endif

	uint16_t mAhSend;
	
	if(percentage >= 100)
		mAhSend = 0xFFFF;
	else {
		mAhSend = (percentage * BGG_BATTERY_DIVIDER) + BGG_BATTERY_OFFSET;
	}
	
	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);
	init_battery_gas_gauge();
}


/************************ (C) COPYRIGHT heinrichs weikamp *****END OF FILE****/