Misused `&=` operator in method `ADCInit()` about ch554_sdcc HOT 2 CLOSED

Good catch- I'd write it like this to make it even more clear:
ADC_CFG = (ADC_CFG & ~bADC_CLK) | speed;

If you send a pull request, we can merge it.

from ch554_sdcc.

The comment of the code is also the opposite of the document.

ADC reference clock frequency selection bit, if the bit is 0, select the slow clock, and 384 Fosc cycles are required for each ADC. If the bit is 1, select the fast clock, and 96 Fosc cycles are required for each ADC

* Input          : uint8_t speed clock setting
                   1 Slow 384 Fosc                   								
                   0 Fast 96 Fosc	

from ch554_sdcc.