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Adc采样电压

问题:我想使用P0_4作为电压检测引脚,检测2530芯片自身的供电电压,请问我以下的步骤是否正确?

 #define HAL_ADC TRUE

void read_voltage( void )
{
	uint16 voltage = 0;
	P0SEL |= BV(4); 
	P0DIR &= ~BV(4);
	HalAdcInit();    //adcRef = HAL_ADC_REF_VOLT;
	voltage = HalAdcRead( HAL_ADC_CHANNEL_4, HAL_ADC_RESOLUTION_14 );
	printf( "voltage is %d %d\r\n", HI_UINT16[voltage], LO_UINT16[voltage]);
}
得出的打印值为 0x0F,0xFF;用万用表测出的电压值为2.9v。请问是哪里出了问题?