I come across 2 questions about the lradc module recently.
1. As mentioned in the title, the iMX28_RM has a reference in chapter 38.2, page 2662,
For input channels (other than BATT, 5V, or VDDIO) with signals larger than 1.85
V, the divide-by-two option should be set
(HW_LRADC_CTRL2_DIVIDE_BY_TWO). With the DIVIDE_BY_TWO option
set, the maximum input voltage is VDDIO – 50mv.
if our VDDIO is 3.3V, does that mean the channels like lradc0 can't sample voltage which is larger than 3.3v minus 50mv?
2. If I configure the channel 0 as an analog input. So when one conversion is finished, the VALUE field in HW_LRADC_CH0 represents the actual voltage or I have to have it multiplied by voltage/per bit.
Thanks a lot.