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TI的工程师们，问下CC2540的adc在使用时，IO口要配置哪些寄存器，要不要配置成三态？
unsigned int adc_result;
APCFG=0x80;///adc=p0.7
ADCCON1=0x33;
ADCCON3=0x37;///内部参考电压 单通道 12位 实际效果为11位！！！！！！！！！！！
ADCCON1 |= 0x40;///start adc
while( !(ADCCON1 & ADCCON1_EOC));///等待转换完成
adc_result = (ADCL >> 4);
adc_result |= (ADCH << 4);
