bms/Application/app/iv_measure.c

#include "iv_measure.h"
#include "bsp/ml5238.h"
#include "bsp/cs1180.h"
#include "bsp/gd32_adc.h"
#include "bsp/clock.h"
#include "bsp/gpio.h"
#include "bsp/temp_lookup_tab.h"
/* measure the temp & current & voltage for battery pack by using
 * ms5238 & cs1180(only used when bms is in small current loading)
*/

/* this is the inited gain set to the ms5238, but the really gain is  calibrated
*  by measure_system_calibrate
*/
static float imon_gain_10x = 10.0f;
static float imon_gain_50x = 50.0f;
static float imon_gain_now;
static float vim0_10x = 0.0f;
static float vim0_50x = 0.0f;
static float vim0_now;
#define r_resistor 1.0f // 1ºÁÅ·
#define r_pcb_resistor 0.0f // pcb resistor
static const float r_sense = r_resistor + r_pcb_resistor;
static const float v_ref = 3300.0f; //adc ref = 3.3v
static const float max_adc = 65535.0f;
static const float small_cur_r_sense = 360.0f;//mo

static void __inline__ select_gain_10x(int select){
	if (select){
		ML5238_IMON_OUT_10X();
		imon_gain_now = imon_gain_10x;
		vim0_now = vim0_10x;
	}else {
		ML5238_IMON_OUT_50X();
		imon_gain_now = imon_gain_50x;
		vim0_now = vim0_50x;
	}
}

static int __inline__ _is_x10_gain(void){
	return imon_gain_now == imon_gain_10x;
}

/*calibrate when startup && temperature is changed more than 5? degree
* calibrate the ms5238's IMON output voltage gain
*/
void current_calibrate(void){
	/* calibrate the 10x gain */
	ML5238_IMON_OUT_ZERO_10X();
	vim0_10x = adc_sample(ADC_CHAN_IMON ,TRUE);
	ML5238_IMON_OUT_V2000_10X();
	float vim1 = adc_sample(ADC_CHAN_IMON, FALSE);
	ML5238_IMON_OUT_V100_10X();
	float vr = adc_sample(ADC_CHAN_IMON, FALSE);
	imon_gain_10x = ML5238_GAIN(vim0_10x, vim1, vr);

	/* calibrate the 50x gain */
	ML5238_IMON_OUT_ZERO_50X();
	vim0_50x = adc_sample(ADC_CHAN_IMON ,TRUE);
	ML5238_IMON_OUT_V2000_50X();
	vim1 = adc_sample(ADC_CHAN_IMON, FALSE);
	ML5238_IMON_OUT_V100_50X();
	vr = adc_sample(ADC_CHAN_IMON, FALSE);
	imon_gain_50x = ML5238_GAIN(vim0_50x, vim1, vr);

	select_gain_10x(0);//default gain is 50x, if 50x overflow, use 10x

}

void measure_system_init(void){
	adc_init();
	ml5238_init();
	cs1180_init();
	current_calibrate();
}

/* get battery pack's current (mA) */
float get_imon_current(int calibration){
	float adc = adc_sample(ADC_CHAN_IMON, calibration);
	if (adc >= 0xFFF0 && (!_is_x10_gain())){//overflow, use 10x gain
		select_gain_10x(1);
		adc = adc_sample(ADC_CHAN_IMON, calibration);
	}else if (adc <= 0x1F && (_is_x10_gain())){// is too small, select 50x gain
		select_gain_10x(0); 
		adc = adc_sample(ADC_CHAN_IMON, calibration);		
	}
	float cali_adc = ML5238_V_RSENSER(adc, vim0_now, imon_gain_now);

	return (cali_adc / max_adc) * v_ref / r_sense * 1000;
}

/* get cell's voltage (mV) */
float get_vmon_voltage(int cell, int calibration){
	ml5238_select_cell_to_vmon(cell);
	delay_us(50);
	float adc = adc_sample(ADC_CHAN_VMON, calibration);

	return (adc / max_adc) * v_ref * 1000;
}

/* get battery pack's aux current (mA) */
float get_small_current(int calibration){
	float adc = adc_sample(ADC_CHAN_AUX_CURR, calibration);

	return (adc / max_adc * v_ref) / small_cur_r_sense * 1000;
}

int get_pcb_temperature(int calibration){
	TEMP_OPEN(1);
	delay_us(100);
	uint16_t adc = adc_sample(ADC_CHAN_TEMPERATURE_4, calibration);
	TEMP_OPEN(0);
	return get_temp_by_adc(adc);
}

/*
 * index : 0...2
*/
int get_pack_temperature(int index, int calibration){
	TEMP_OPEN(1);
	delay_us(100);
	uint16_t adc = adc_sample(ADC_CHAN_TEMPERATURE_1 + index, calibration);
	TEMP_OPEN(0);
	return get_temp_by_adc(adc);
}