bq27441放电时读电池电量百分比数值没有变化

RC和FCC的值略有变化，但是变化很小。

CHEM ID没有配置，读出来是0x0312，是否需要设置？

每次重新开机的时候电量会刷新一次，其他时间就不再更新了。只有重启才能得到最新的电量。

下图是我打印的日志，开机后半个小时以内ROSC保持12%不变化，RC变化了三个数值136、131和127，同时FCC也变化了三个值1160、1155、1151然后就不再变化，最后一组值维持了20多分钟。

然后重启设备，ROSC直接降到3%，RC变成了27，

这是我的配置方式，按照quickstart的流程图来写的。

void bq27441Config(void)
{
    uint16_t result;
    uint16_t version;
    
    bmControlRead(BM_BQ27441_CTRL_DEVICE_TYPE, &version);

    if(version == 0x0421)
    {
        /*Steps to unseal the fuel gauge*/
        bmControl(0x8000);
        bmControl(0x8000);
        
        /* Instructs fuel gauge to enter CONFIG UPDATE mode. */
        bmControl(BM_BQ27441_CTRL_SET_CFGUPDATE);

        HalWaitMs(1);

        result = 0;
        /* Check if CFGUPMODE bit is set in FLAGS */
        while(!(result & 0x0010))
        {
        	bmRead16(BM_BQ27441_CMD_FLAGS, &result);
        }

        /* Enable Block data memory control */
        bmCommand(BM_BQ27441_CMD_BLOCK_DATA_CONTROL, 0x00);

        /* Set the data class to be accessed */
        bmCommand(BM_BQ27441_CMD_DATA_CLASS, 0x52);

        /* Write the block offset loaction */
        bmCommand(BM_BQ27441_CMD_DATA_BLOCK, 0x00);

        HalWaitMs(1);

        uint8_t old_chksum = 0;
        uint8_t new_chksum = 0;
        uint8_t tmp_chksum = 0;
        uint8_t chksum = 0;
        do
        {
        	/* Read Block Data Checksum */
        	bmReadChecksum(&old_chksum);
            tmp_chksum = 0xFF - old_chksum;

            HalWaitMs(1);

            uint8_t i;
            uint8_t old[8];
            //read value
            HalI2CReadBytes(BM_BQ27441_ADDR, 0x4A, 2, &old[0]);
            HalI2CReadBytes(BM_BQ27441_ADDR, 0x4C, 2, &old[2]);
            HalI2CReadBytes(BM_BQ27441_ADDR, 0x50, 2, &old[4]);
            HalI2CReadBytes(BM_BQ27441_ADDR, 0x5B, 2, &old[6]);

            for(i = 0; i < sizeof(old); i++)
            {
                tmp_chksum = tmp_chksum - old[i];
            }
            
        	/* Write new design capacity */
        	bmWrite16(0x4A, numSwap(BM_CONF_DESIGN_CAPACITY));
        	tmp_chksum = tmp_chksum + (uint8_t)(BM_CONF_DESIGN_CAPACITY >> 8) + (uint8_t)(BM_CONF_DESIGN_CAPACITY & 0x00ff);

        	/* Write new design energy */
        	bmWrite16(0x4C, numSwap(BM_CONF_DESIGN_ENERGY));
        	tmp_chksum = tmp_chksum + (uint8_t)(BM_CONF_DESIGN_ENERGY >> 8) + (uint8_t)(BM_CONF_DESIGN_ENERGY & 0x00ff);

        	/* Write new terminate voltage */
        	bmWrite16(0x50, numSwap(BM_CONF_TERMINATE_VOLTAGE));
        	tmp_chksum = tmp_chksum + (uint8_t)(BM_CONF_TERMINATE_VOLTAGE >> 8) + (uint8_t)(BM_CONF_TERMINATE_VOLTAGE & 0x00ff);

        	/* Write new taper rate */
        	bmWrite16(0x5B, numSwap(BM_CONF_TAPER_RATE));
        	tmp_chksum = tmp_chksum + (uint8_t)(BM_CONF_TAPER_RATE >> 8) + (uint8_t)(BM_CONF_TAPER_RATE & 0x00ff);

        	/* Checksum calculation */
        	new_chksum = 0xff - tmp_chksum;

        	/* Write new taper rate */
        	bmCommand(BM_BQ27441_CMD_BLOCK_DATA_CHECKSUM, new_chksum);

        	HalWaitMs(1);

        	/* Steps to verify RAM update completed correctly */
        	
            /* Set the data class to be accessed */
            bmCommand(BM_BQ27441_CMD_DATA_CLASS, 0x52);
            
            /* Write the block offset loaction */
            bmCommand(BM_BQ27441_CMD_DATA_BLOCK, 0x00);
                
        	bmReadChecksum(&chksum);

        	HalWaitMs(1);
        }
        while(new_chksum != chksum);

        /* Write new terminate voltage */
        bmControl(BM_BQ27441_CTRL_SOFT_RESET);
        HalWaitMs(2);

        result = 0;
        /* Check if CFGUPMODE bit is cleared in FLAGS */
        while(result & 0x0010)
        {
        	bmRead16(BM_BQ27441_CMD_FLAGS, &result);
        }

        bmControl(BM_BQ27441_CTRL_SEALED);//Step to seal the fuel gauge
    }
}

0066.log.txt