Use P1.2, P1.3, P1.4, and P1.5 as sampling channels, taking the demo's msp430fr231x_adc10_10.c file as an example.
1. Configure the above 4 pins to ADC mode:
P1SEL0 |= BIT2 + BIT3 + BIT4 + BIT5;
P1SEL...
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