MSP430FR5972: ADC 2 channel

Hi Ryan Brown,

Thank you for reply.
As per my understand, please varify is it correct or not for A12 and A14

P9SEL0 |= BIT4 + BIT6; // Configure P9.4 and P9.6 for ADC
P9SEL1 &= ~(BIT4 + BIT6); // Configure P9.4 and P9.6 for ADC

REFCTL0 |= REFVSEL_0 | REFON; // Select internal ref = 1.2V

ADC12CTL0 = ADC12SHT0_2 | ADC12ON;
ADC12CTL1 = ADC12SHP; // ADCCLK = MODOSC; sampling timer
ADC12CTL2 |= ADC12RES_2; // 12-bit conversion results
ADC12IER0 |= ADC12IE12; // Enable ADC conv complete interrupt
ADC12MCTL0 |= ADC12INCH_12 | ADC12VRSEL_1; // A1 ADC input select; Vref=1.2V

while(!(REFCTL0 & REFGENRDY)); // Wait for reference generator to settle

Hello PK U,

You should be setting the P9SEL1 bits, not clearing them. If you plan to use ADC12MCTL0 then the interrupt you should use is ADC12IE0. Please refer to the ADC code examples provided by TI.

Regards,
Ryan

Ya you are right.
Now I want to access two different ADC channel. I want to see both the output at a time It should be convert all the time.

Hi Ryan,

Now I am facing one more issue, I am giving the different supply (from 1.5 V to 3.6 V) to ADC channel P9.4 (A12) but it give the MAX value (4095) and when I provide GND then it gives 0 (zero) value.

conclution it gives only two value either 4095 or 0.

I am using code like:-

void adc_ch_A12()
{
ADC12MCTL0 |= ADC12INCH_12 | ADC12VRSEL_1; // A12 ADC input select; Vref=1.2V
P9SEL1 |= BIT4; // Configure P9.4 for ADC
}

void adc_init()
{
// Configure ADC12
ADC12CTL0 = ADC12SHT0_2 | ADC12ON;
ADC12CTL1 = ADC12SHP; // ADCCLK = MODOSC; sampling timer
ADC12CTL2 |= ADC12RES_2; // 12-bit conversion results
ADC12IER0 |= ADC12IE0; // Enable ADC conv complete interrupt
}

Thank you Ryan for quick reply my problem is solved.