ADC读取
ADC读取有两种方式：
- 1，直接读取(immediate)
- 2，定时读取(timer-triggerd)
读取方式通过AUXADC_CON0来控制
ADC通道
| Channel ID | Description | 是否外部管脚 |
|---|---|---|
| Channel 0 | VBAT | 否 |
| Channel 1 | ISENSE | 否 |
| Channel 2 | CHRIN | 否 |
| Channel 3 | BATON(BATTemp) | 否 |
| Channel 4 | AUXIN4 | 是 |
| Channel 5 | ACCDET | 是 |
| Channel 9 | ClassAB | 否 |
| Channel 12 | XP/Externl | 否 |
| Channel 13 | YP/Externl | 否 |
| Channel 14 | YM/Externl | 否 |
| Channel 15 | XM/Externl | 否 |
There are only two externl pins(channel 4,5) for voltage detection. Other channes(0-3) are for battery vol, current, charger and battery temperature. channel 9 for audio.
其中channel 4、5可以在软件里配置给固定的逻辑通道
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