本文主要是介绍BMT（battery management task），希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
BMT（battery management task）模块主要包含 ADC management，charging control和 BMT customization等相关内容。
BMT模块软件架构
脉冲充电硬件原理图如下：
charging control 主要阶段的电池电压和充电电流情况如下：
BMT状态转换图如下：
BMT模块客制化
const bmt_customized_struct bmt_charging_para =
{
#if !defined(BMT_CHARGING_DISABLE)
#if defined(DRV_BMT_HIGH_VCHG_ADAPTIVE_CHARGE_CURRENT_SUPPORT)
(kal_int32)CHR_VCHARGER_HV_HIGH, /* kal_int32 VCHARGER_HIGH */
#else(kal_int32)CHR_VCHARGER_HW_HIGH, /* HW HV*/
#endif(kal_int32)CHR_VCHARGER_HIGH, /* SW HV */(kal_int32)CHR_VCHARGER_LOW, /* kal_int32 VCHARGER_LOW */(kal_int32)CHR_ICHARGE_ON_HIGH, /* kal_int32 ICHARGE_ON_HIGH */(kal_int32)CHR_ICHARGE_ON_LOW, /* kal_int32 ICHARGE_ON_LOW */(kal_int32)CHR_ICHARGE_OFF_HIGH, /* kal_int32 ICHARGE_OFF_HIGH */(kal_int32)CHR_V_PRE2FAST_THRES, /* kal_int32 V_PRE2FAST_THRES */ (kal_int32)CHR_V_PRE2FULL_THRES, /*kal_int32 CHR_V_PRE2FULL_THRES */(kal_int32)CHR_FAST_ICHARGE_HIGHLEVEL, /* kal_int32 FAST_ICHARGE_HIGHLEVEL */(kal_int32)CHR_FAST_ICHARGE_LOWLEVEL, /* kal_int32 FAST_ICHARGE_LOWLEVEL */(kal_int32)CHR_I_TOPOFF2FAST_THRES, /* kal_int32 I_TOPOFF2FAST_THRES */(kal_int32)CHR_I_TOPOFF2FULL_THRES, /* kal_int32 I_TOPOFF2FULL_THRES */#if defined(LINEAR_LI_CHARGING) || defined(PULSE_LI_CHARGING) (kal_int32)CHR_V_FAST2TOPOFF_THRES_LI, /* kal_int32 V_FAST2TOPOFF_THRES */(kal_int32)CHR_V_FULL2FAST_THRES_LI, /* kal_int32 V_FULL2FAST_THRES */(kal_int32)CHR_MAX_VBAT_LI, /* kal_int32 MAX_VBAT_LI */(kal_int32)CHR_V_PROTECT_HIGH_LI, /* kal_int32 V_PROTECT_HIGH_LI */(kal_int32)CHR_V_PROTECT_LOW_LI, /* kal_int32 V_PROTECT_LOW_LI */
#endif
#if defined(LINEAR_NIMH_CHARGING) || defined(PULSE_NIMH_CHARGING) (kal_int32)CHR_V_TEMP_FAST2FULL_THRES_NI, /* kal_int32 V_TEMP_FAST2FULL_THRES_NI */(kal_int32)CHR_V_FULL2FAST_THRES_NI, /* kal_int32 V_FULL2FAST_THRES_NI */(kal_int32)CHR_MAX_VBAT_NI, /* kal_int32 MAX_VBAT_NI */
#endif /* PRE CHARGE ,search table */(kal_uint32)PRE_TON_TIME, /* kal_uint32 PRE_TON */ (kal_uint32)PRE_TOFF_TIME, /* kal_uint32 PRE_TOFF *//* FAST CHARGE, search table */(kal_uint32)TOPOFF_TON_TIME, /* kal_uint32 TOPOFF_TON */(kal_uint32)TOPOFF_TOFF_TIME, /* kal_uint32 TOPOFF_TOFF */#if defined(PULSE_LI_CHARGING) || defined(PULSE_NIMH_CHARGING) (kal_uint32)PULSE_POSTFULL_TWAIT_TIME, /* kal_uint32 BATPOSTFULL_TWAIT_LI */(kal_uint32)PULSE_POSTFULL_TON_TIME, /* kal_uint32 BATPOSTFULL_TON_LI */(kal_uint32)PULSE_POSTFULL_TOFF_TIME, /* kal_uint32 BATPOSTFULL_TOFF_LI */
#endif
#if defined(LINEAR_LI_CHARGING) || defined(PULSE_LI_CHARGING) (kal_uint32)BATFULL_TON_TIME_LI, /* kal_uint32 BATFULL_TON_LI */(kal_uint32)BATFULL_TOFF_TIME_LI, /* kal_uint32 BATFULL_TOFF_LI */
#else(kal_uint32)BATFULL_TON_TIME_NI; /* unit : second */(kal_uint32)BATFULL_TOFF_TIME_NI;
#endif (kal_uint32)CHR_STOP_TOFF_TIME, /* kal_uint32 BATFULL_TOFF */(kal_uint32)BATHOLD_TOFF_TIME, /* kal_uint32 BATHOLD_OFF */// kal_int32 CurrOffset[3];//{CURRENT_OFFSET_IDLE_MODE, // 100maCURRENT_OFFSET_TALK_MODE,CURRENT_OFFSET_SWOFF_MODE,//}, (kal_uint32)TOTAL_CHARGE_TIME,// kal_uint8 TONOFFTABLE[6][2]; //{(kal_uint8)FAST_ICHARGE_HI_NORMAL_ON, (kal_uint8)FAST_ICHARGE_HI_NORMAL_OFF,(kal_uint8)FAST_ICHARGE_MID_NORMAL_ON, (kal_uint8)FAST_ICHARGE_MID_NORMAL_OFF,(kal_uint8)FAST_ICHARGE_LO_NORMAL_ON, (kal_uint8)FAST_ICHARGE_LO_NORMAL_OFF,(kal_uint8)FAST_ICHARGE_HI_TALK_ON, (kal_uint8)FAST_ICHARGE_HI_TALK_OFF,(kal_uint8)FAST_ICHARGE_MID_TALK_ON, (kal_uint8)FAST_ICHARGE_MID_TALK_OFF,(kal_uint8)FAST_ICHARGE_LO_TALK_ON, (kal_uint8)FAST_ICHARGE_LO_TALK_OFF,//},#if defined(DRV_BMT_HIGH_VCHG_ADAPTIVE_CHARGE_CURRENT_SUPPORT)//kal_int32 HIGH_VCHG_TABLE[VCHG_VOL_LEVEL][VCHG_PARAMTER_COUNT];//{HIGH_V_VCHG_THRESHHOLD_LEVEL_0, HIGH_V_CHARGING_CURRENT_LEVEL_0, HIGH_V_SAFETY_TIME_LEVEL_0,HIGH_V_VCHG_THRESHHOLD_LEVEL_1, HIGH_V_CHARGING_CURRENT_LEVEL_1, HIGH_V_SAFETY_TIME_LEVEL_1,HIGH_V_VCHG_THRESHHOLD_LEVEL_2, HIGH_V_CHARGING_CURRENT_LEVEL_2, HIGH_V_SAFETY_TIME_LEVEL_2,HIGH_V_VCHG_THRESHHOLD_LEVEL_3, HIGH_V_CHARGING_CURRENT_LEVEL_3, HIGH_V_SAFETY_TIME_LEVEL_3,HIGH_V_VCHG_THRESHHOLD_LEVEL_4, HIGH_V_CHARGING_CURRENT_LEVEL_4, HIGH_V_SAFETY_TIME_LEVEL_4, HIGH_V_VCHG_THRESHHOLD_LEVEL_5, HIGH_V_CHARGING_CURRENT_LEVEL_5, HIGH_V_SAFETY_TIME_LEVEL_5,HIGH_V_VCHG_THRESHHOLD_LEVEL_6, HIGH_V_CHARGING_CURRENT_LEVEL_6, HIGH_V_SAFETY_TIME_LEVEL_6,//},
#endif(kal_bool)CHR_BATTERY_TYPE,(kal_bool)CHR_CHECK_CHARGER_VOLTAGE,(kal_bool)CHR_CHECK_BATT_TEMP,#endif //#if !defined(BMT_CHARGING_DISABLE) (kal_bool)CHR_CHECK_BATTERY,(kal_uint32)CHR_BATT_EXIST_ADC_THRESHOLD /* kal_uint32 BATT_EXIST_ADC_THRESHOLD */
};
常用客制化参量如下：
充电电流如何设置
充电过程中只有Fast charge（CC）阶段的充电电流是可以通过软件设定的，Pre-charge阶段充电电流是由硬件决定的，一般USB充电时预充电流为70mA，AC充电时预充电流为200mA。TOP-OFF（CV）阶段的充电电流是不断下降的，默认在ICHG<120mA时进入Charger Complete阶段。
CC阶段充电电流的设置可通过修改chr_parameter.h文件中的宏：
// Configuration of AC/USB Charge Current
#define CHR_AC_CHARGE_CURRENT PMU_CHARGE_CURRENT_450_00_MA
#define CHR_USB_CHARGE_CURRENT PMU_CHARGE_CURRENT_450_00_MA
#define CHR_NON_AC_CHARGE_CURRENT PMU_CHARGE_CURRENT_450_00_MA
#define CHR_USB_CHARGING_HOST_CHARGE_CURRENT PMU_CHARGE_CURRENT_450_00_MA或直接在hal\peripheral\src\bmt_utility.c文件的void bmt_set_chr_current(void)函数中设置：
void bmt_set_chr_current(void)
{ kal_uint32 chr_current = PMU_CHARGE_CURRENT_0_00_MA;CHR_DET_TYPE_ENUM chr_type;chr_type = bmt_get_chr_type();switch (chr_type){case PW_AC_CHR:chr_current = CHR_AC_CHARGE_CURRENT;//修改CC电流drv_trace0(TRACE_GROUP_10, BMT_SET_AC_CHARGE_CURRENT_TRC); break;case PW_USB_CHR:chr_current = bmt_usb_chr_current;//修改成USB电流drv_trace0(TRACE_GROUP_10, BMT_SET_USB_CHARGE_CURRENT_TRC); break;case PW_AC_NON_STD_CHR:chr_current = CHR_NON_AC_CHARGE_CURRENT;break; case PW_USB_CHARGING_HOST_CHR:chr_current = CHR_USB_CHARGING_HOST_CHARGE_CURRENT;break;default:ASSERT(0);break;}通过宏设置的充电电流与实际设置下去的充电电流关系是：
实际设置下去的充电电流是通过hal\peripheral\src\bmt_internal_chr_setting.c中的bmt_find_and_set_the_nearest_current(void *data)函数从hal\peripheral\src\bmt_hw.c中chr_CS_VTH[CS_VTH_SIZE] 表里搜索的与通过宏设置的最接近的那一档。
static DCL_STATUS bmt_find_and_set_the_nearest_current(void *data)
{DCL_STATUS status = STATUS_OK;DCL_UINT32 set_chr_current;DCL_UINT32 array_size;DCL_UINT16 register_value;array_size = GETARRAYNUM(chr_CS_VTH);set_chr_current = bmt_find_closest_level(chr_CS_VTH, array_size, *(DCL_UINT32 *)data);register_value = bmt_parameter_to_value(chr_CS_VTH, array_size ,set_chr_current);status = bmt_set_register_value(RG_CS_VTH_OFFSET,RG_CS_VTH_MASK,register_value<<RG_CS_VTH_SHIFT);return status;
}
const DCL_UINT32 chr_CS_VTH[CS_VTH_SIZE]=
{PMU_CHARGE_CURRENT_1600_00_MA, PMU_CHARGE_CURRENT_1500_00_MA,PMU_CHARGE_CURRENT_1400_00_MA, PMU_CHARGE_CURRENT_1300_00_MA,PMU_CHARGE_CURRENT_1200_00_MA, PMU_CHARGE_CURRENT_1100_00_MA,PMU_CHARGE_CURRENT_1000_00_MA, PMU_CHARGE_CURRENT_900_00_MA,PMU_CHARGE_CURRENT_800_00_MA, PMU_CHARGE_CURRENT_700_00_MA,PMU_CHARGE_CURRENT_600_00_MA, PMU_CHARGE_CURRENT_500_00_MA,PMU_CHARGE_CURRENT_400_00_MA, PMU_CHARGE_CURRENT_300_00_MA,PMU_CHARGE_CURRENT_200_00_MA, PMU_CHARGE_CURRENT_70_00_MA
};停充电流是在chr_parameter.h文件中通过如下宏设置的：
#define CHR_I_TOPOFF2FULL_THRES 120000此值最小只能设置为60mA，否则充电电流会波动比较大。
电池检测
如果引脚BAT_ON>2.5V，充电器将立即关闭。 这个功能是用来阻止充电器的输入，以防止电线意外被取下。 在充电过程中，电池断开可能导致VBAT电压浪涌，在启动过压保护之前损坏芯片。
电池是否存在的检测接口函数是：
kal_bool bmt_is_bat_on()
{if(bmt_charging_para->bmt_check_battery){return bmt_is_bat_on_pw();}else{return bmt_check_if_bat_on();}
}首先要将chr_parameter.h文件中的宏CHR_CHECK_BATTERY设置为KAL_TRUE。
电池温度测量与过热保护
温度检测并不是实际去检测温度，而是实时检测BAT_ON引脚的电压而感知温度 BAT_ON Voltage = 2.8V*RNTC/(R1+RNTC) 当温度变化，RNTC变化，BAT_ON引脚电压变化，BB通过电压变化感知温度变化。
注意： 1.在不使用电池充电检测功能时，BAT_ON pin需下拉10K电阻到GND。 2.电路图中R2是为了防止不当的电池设置(BATID pin 直接接电池 GND，中间未加电阻，即没有RNTC)造成在插电池瞬间，可能产生的VRTC电压不稳定，需保留。 3.若电池温度检测功能未使用，请不要把BATID pin接到Base Band。
弹出充电完成提示后为什么ISENSE还有电流
充电完成的判断条件是在CV状态下检测到充电电流小于chr_parameter.h中的设定值：
#define CHR_I_TOPOFF2FULL_THRES 120000从BMT转换图中可见当VBAT>4.05V时会跳转到CV状态，在CV状态下充电电流不断下降，当充电电流小于120mA时，充电状态跳转到CHR_BATFULL，Show Charger Complete，然后向上层发送充电完成消息BMT_CHARGE_COMPLETE，并启动30分钟定时器BMT_STOP_CHARGE_TIMER，接着会在CHR_BATFULL状态下继续涓流充电30分钟才完全切断充电流程。
static void BMT_CHRTOPOFF_OFF(BATPHYStruct *BATPHYS)
{drv_trace0(TRACE_STATE, BMT_CHRTOPOFF_OFF_STATE_TRC);if(bmt_get_chr_cv_det() || (BATPHYS->VBAT >= 4200000)){BATFULL_index++;}if(BATFULL_index == 6 ){// change state to post fullBMT.bat_state = CHR_POSTFULL;drv_trace0(TRACE_GROUP_10, BMT_CHR_POSTFULL_CHANGE_TRC);/*30min*/bmt_set_timer(BMT_STOP_CHARGE_TIMER,STOPTIMER_TIMEOUT_TICK);bmt_sendMes2UEM(BMT_CHARGE_COMPLETE);bmt_timer_config(bmt_charging_para.BATPOSTFULL_TWAIT_LI*KAL_TICKS_1_SEC); //wait 90 seconds, then check the vbat at BMT_CHRBATFULL_OFFBATFULL_index = 0; //reset the index, recount the percentage again.return;}bmt_CtrlCharge((kal_uint8)KAL_TRUE);bmt_timer_config(bmt_charging_para.TOPOFF_TON*CHARGING_TIME_UNIT);
}定时器的设置是在：
#define STOPTIMER_TIMEOUT_TICK (KAL_TICKS_1_MIN*30)有关Vcharger 能够识别的高压和低压值
// For V Charge check, turn on by CHR_CHECK_CHARGER_VOLTAGE = KAL_TRUE
#define CHR_VCHARGER_HW_HIGH PMU_VOLT_07_000000_V
#define CHR_VCHARGER_HIGH 6500000
#define CHR_VCHARGER_LOW 0chr_parameter.h中的CHR_VCHARGER_HW_HIGH设置的是硬件检测的充电高压，CHR_VCHARGER_HIGH是软件检测的充电高压，CHR_VCHARGER_LOW 目前代码中没有实际用到，是在寄存器CHR_COO[11:8]RG_VCDT_LV_VTH中设置的（具体参考datasheet）。
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