MSP430FR2100: ADC Busy Bit Stuck High

Ross Petty

Intellectual 290 points

Part Number: MSP430FR2100

I'm trying to get the ADC working on the MSP430FR2100. I have the following register settings:

ADCCTL1 = 0x00;
ADCCTL2 = 0x10;
ADCMCTL0 = 0x01;
ADCCTL0 = 0x12;

I then OR in a 1 into ADCCTL0 to set the ADCSC bit, which should start a sample-and-conversion cycle.

Then, I wait for ADCBUSY bit in ADCCTL1 to go low....but it never does.

Is there a step I'm forgetting to do?

over 2 years ago

0 Bruce McKenney47378 over 2 years ago

Guru 88700 points

> ADCCTL1 = 0x00;

I suggest instead

> ADCCTL1 = ADCSHP; // ADC does the sample timing

0 Ross Petty over 2 years ago in reply to Bruce McKenney47378

Intellectual 290 points

I have changed ADCCTL1 to set the ADCSHP bit as you've suggested, but the problem remains: The ADCBUSY bit is stuck high.

+1 Ross Petty over 2 years ago in reply to Ross Petty

Intellectual 290 points

Okay, I got it working. The change that made a difference was setting both ADCENC and ADCSC at the same time, and then clearing out ADCENC when the conversion was complete. Thanks

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MSP430FR2100: ADC Busy Bit Stuck High