bms/Application/app/sox/measure.c

#include "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"
#include "bsp/shark_bsp.h"
#include "libs/logger.h"
/* measure the temp & current & voltage for battery pack by using
 * ms5238 & cs1180(only used when bms is in small current loading)
*/
/*
1. 小电流
   cs1180(32x):0.305-0.315,      0.277-0.286,      0.255-0.264,      0.220-0.228,      0.184-0.190,      0.137-0.142,      0.062-0.064,      0.011-0.009:0.012
   ml5289(50x):0.307-0.313:0.330,0.277-0.275:0.290,0.254-0.251:0.271,0.221-0.208:0.253,0.183-0.170:0.196,0.136-0.121:0.155,0.061-0.072:0.096,   0.011-0.033:0.060
2. 大电流
   cs1180(32x):1.861-2.082
   ml5238(50x):1.869-1.865-1.890
*/
/* 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 gain_default_50x 1
#define CS1180_MAX_CURRENT 4500 //MA, cs1180的最大电流，超过这个使用ML5238
#define r_pcb_resistor 0.0f // pcb resistor
static const float r_sense = r_resistor + r_pcb_resistor;
static const float v_gd_ref = 3300.0f; //adc ref = 3.3v
static const float max_gd_adc = 4095.0f;//65536.0f;
static const float v_cs1180_ref = 1235.0f;//cs1180 vref = 1.235v
static const float max_cs1180_adc = 0x7FFFF;//
static const float small_cur_r_sense = 360.0f;//欧姆

#define GD32_ADC_READ_TIMES 128

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;
}

float get_ml5238_gain(void){
	return imon_gain_now;
}

float get_ml5238_vos(void){
	return vim0_now;
}
static void current_10x_calibrate(void){
	/* calibrate the 10x gain */
	ML5238_IMON_OUT_ZERO_10X();
	vim0_10x = adc_sample_avg(ADC_CHAN_IMON, GD32_ADC_READ_TIMES);
#if 0	
	ML5238_IMON_OUT_V2000_10X();
	float vim1 = adc_sample_avg(ADC_CHAN_IMON, GD32_ADC_READ_TIMES);
	ML5238_IMON_OUT_V100_10X();
	float vr = adc_sample_avg(ADC_CHAN_IMON, GD32_ADC_READ_TIMES);
	imon_gain_10x = ML5238_GAIN(vim0_10x, vim1, vr);
#else
	imon_gain_10x = 10.0f;
#endif
}

static void current_50x_calibrate(void){
	/* calibrate the 50x gain */
	ML5238_IMON_OUT_ZERO_50X();
	vim0_50x = adc_sample_avg(ADC_CHAN_IMON, GD32_ADC_READ_TIMES);
#if 0
	ML5238_IMON_OUT_V2000_50X();
	float vim1 = adc_sample_avg(ADC_CHAN_IMON, GD32_ADC_READ_TIMES);
	ML5238_IMON_OUT_V20_50X();
	float vr = adc_sample_avg(ADC_CHAN_IMON, GD32_ADC_READ_TIMES);
	imon_gain_50x = ML5238_GAIN(vim0_50x, vim1, vr);
#else
	imon_gain_50x = 50.0f;
#endif
}

/*calibrate when startup && temperature is changed more than 5? degree
* calibrate the ms5238's IMON output voltage gain
*/
void current_calibrate(void){
	current_10x_calibrate();
	current_50x_calibrate();
#ifdef gain_default_50x
	select_gain_10x(0);
#else
	select_gain_10x(1);
#endif
}


void measure_adc_init(void){
	ml5238_init();
	gd32_adc_init();
	current_calibrate();
	cs1180_adc_init();
	set_log_level(MOD_SYSTEM, L_debug);
}

/* get battery pack's current (mA) */
static float get_pack_current_by_gd(void){
	float adc = adc_sample_avg(ADC_CHAN_IMON, GD32_ADC_READ_TIMES);
	if (adc >= (max_gd_adc - 255.0f) && (!_is_x10_gain())){//overflow, use 10x gain
		select_gain_10x(1);
		adc = adc_sample_avg(ADC_CHAN_IMON, GD32_ADC_READ_TIMES);
	}else if (abs(adc - vim0_now) <= 255.0f && (_is_x10_gain())){// is too small, select 50x gain
		select_gain_10x(0); 
		adc = adc_sample_avg(ADC_CHAN_IMON, GD32_ADC_READ_TIMES);		
	}

	float cali_adc = ML5238_V_RSENSER(adc, vim0_now, imon_gain_now);

	return (int)((cali_adc / max_gd_adc) * v_gd_ref / r_sense * 1000);
}

static float get_pack_current_by_cs1180(int *valid){
	float adc = cs1180_adc_sample(valid);
	float vol = (adc / max_cs1180_adc) * v_cs1180_ref;
	return (vol / r_sense) * 1000 - 5.0f;//板子固定5MA，cs1180无法测量到
}

float get_pack_current(int *current_5238){
	float current = get_pack_current_by_gd();
	if (current_5238 != NULL){
		*current_5238 = (int)current;
	}
	if (cs1180_change_gain(current) == 0) {
		int valid = 1;
		float cs1180_current = get_pack_current_by_cs1180(&valid);
		if (valid == 1) {
			current = cs1180_current;
		}
	}
	return current;
}


/* get cell's voltage (mV) */
float get_cell_voltage(int cell){
	ML5238_SELECT_CELL(cell);
	delay_us(100);
	float adc = adc_sample_avg(ADC_CHAN_VMON, GD32_ADC_READ_TIMES);

	return cell_real_vol((adc / max_gd_adc) * v_gd_ref);
}

/* get battery pack's aux current (MA) */
float get_small_current(void){
	float adc = adc_sample_avg(ADC_CHAN_AUX_CURR, GD32_ADC_READ_TIMES);

	return ((adc / max_gd_adc * v_gd_ref)) / small_cur_r_sense;
}

/* 用来判断小电流的情况下，电压小于某一个值认为小电流真正短路,比如16v*/
float get_small_current_voltage(void){
	float s_current_a = get_small_current();//MA

	return s_current_a * (small_cur_r_sense + 28.0f);//28欧姆是mos的D极两个56的并联
}

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

/*
 * index : 0...3, 3 indicat pcb temp
*/
int get_pack_temperature(int index){
	TEMP_OPEN(1);
	delay_us(100);
	uint16_t adc = adc_sample_avg(ADC_CHAN_TEMPERATURE_1 + index, 1);
	TEMP_OPEN(0);
	return get_temp_by_adc((adc<<4)&0xFFFF);
}