CC2650 的heartrate 例程里面有个电池服务，好像可以不需要外部adc引脚就可以直接读取电池电压

static uint8_t battMeasure(void)
{uint32_t percent;// Call measurement setup callbackif (battServiceSetupCB != NULL){battServiceSetupCB();}// Read the battery voltage (V), only the first 12 bitspercent = AONBatMonBatteryVoltageGet();// Convert to from V to mV to avoid fractions.// Fractional part is in the lower 8 bits thus converting is done as follows:// (1/256)/(1/1000) = 1000/256 = 125/32// This is done most effectively by multiplying by 125 and then shifting// 5 bits to the right.percent = (percent * 125) >> 5;// Convert to percentage of maximum voltage.percent = ((percent* 100) / battMaxLevel);// Call measurement teardown callbackif (battServiceTeardownCB != NULL){battServiceTeardownCB();}return percent;
}

代码如上，

AONBatMonBatteryVoltageGet 这个函数接口是怎样获取到电池电压的？

Viki Shi：

//*****************************************************************************
//
//! \brief Get the battery monitor measurement.
//!
//! This function will return the current battery monitor measurement.
//! The battery voltage measurements are updated every cycle.
//!
//! \note The returned value is NOT sign-extended!
//!
//! \note Use the function \ref AONBatMonNewBatteryMeasureReady() to test for
//! a change in measurement.
//!
//! \return Returns the current battery monitor value of the battery voltage
//! measurement in a <int.frac> format size <3.8> in units of volt.
//!
//! \sa AONBatMonNewBatteryMeasureReady()
//
//*****************************************************************************
__STATIC_INLINE uint32_t
AONBatMonBatteryVoltageGet(void)
{uint32_t ui32CurrentBattery;ui32CurrentBattery = HWREG(AON_BATMON_BASE + AON_BATMON_O_BAT);//// Return the current battery voltage measurement.//return (ui32CurrentBattery >> AON_BATMON_BAT_FRAC_S);
}

Viki Shi：

回复 Viki Shi:

这里涉及到的寄存器操作请看：software-dl.ti.com/…/AON_BATMON.html

user1388075：

回复 Viki Shi:

硬件上任何处理都不做就可以读出电池电压么？