MSP430F67791A: ADC10 Triggering from SD24 pulse

There doesn't appear to be any change from the MSP430F67xx non-A devices.

Regards,

James

MSP Customer Applications

James,

thanks for your feedback.

My customer already tried to configure the ADC10_A with trigger coming from SD24_B as shown below.

Unfortunately this is not working. In fact the ADC10 interrupt is not invoked after SD24 request.

They tried different settings but without success. They are only able to have ADC10SHSx = 00b working. Looking into note 29.2.12 of SLAU208P Manual, it seems that trigger generator is limited to F676x1 family: 

Can you kindly confirm me this will be available for 6779x as well?

Thanks and regards,

Alberto

Hello Alberto,

I suspect that this NOTE in our User's Guide may need updated to include the MSP430F677x(A) devices as well. Can you share the code that the customer used for triggering the ADC10 by the SD24 trigger?

I'll check internally to confirm that this feature is supported by the F677x(A) devices and let you know.

Regards,

James

MSP Customer Applications

James,

please find in attachment code example I received from customer.

This is their desired configuration, including 3 SD24 channels, 6 ADC10 channels acquired in sequence.

I look forward to read your feedback.

thanks for your support,

Regards,

Alberto

Project main test_trigger.zip

Hello Alberto,

Thanks for sharing their code. In 'main.c', I see a line of code with a comment that says "this is ok". Can you check what they mean by this? Did this configuration of ADC10CTL1 work and the uncommented line of code with the comment "where am i wrong" not work?

 ADC10CTL0 |= ADC10SHT_2 | ADC10MSC | ADC10ON;                                 // 16ADCclks, MSC (Multiple SampleConversion), ADC ON    (6.5us tra i campionamenti - ~13us ritardo tra fase 1 e fase 3)
  // this is OK
  //ADC10CTL1 = ADC10SHP | ADC10CONSEQ_1 | ADC10SSEL_3 | ADC10DIV_5 | ADC10SHS_0; // pulse sample mode, single sequence, CLOCK select SMCLK /5 (freq.deve essere tra 0.45 e 5.5 MHz) select triggers ADC10SC bit
  // enable  ADC10SC on interrupt TIMER0_A0_ISR                                                         /
  
  // where am I wrong?
  ADC10CTL1 = ADC10SHP | ADC10CONSEQ_1 | ADC10SSEL_3 | ADC10DIV_5 | ADC10SHS_3;   // ????????????????
  //

In the meantime, I'll assume this is the case and compare the two configurations. Let me also point out that Errata ADC42 may be causing an issue here if the customer is triggering the ADC while it's busy.

Regards,

James

MSP Customer Applications

Looking at these two lines more closely, I see that the only difference is ADC10SHSx. This makes sense based on your initial description.

Regards,

James

MSP Customer Applications

Hello Alberto,

Did this resolve the customer's issue? If so, please mark the thread accordingly. I'll be closing the thread shortly.

Regards,

James

MSP Customer Applications

James,

just received customer feedback.
The solution purposed is not what they need. In fact they would like to have a situation similar to SLAA621C, but they are not able to launch the 6 ADC10 conversions with a single trigger input. They are even not able to trigger this using TA0.1 neither SD24 pulse.
The only way they have to start triggering is using bit ADC10SHSx=0, enabling SHI signal and then "Sample timer" module finally launches the conversions.
They can finally survive with this method, but the ones described above would be preferred methods.
Please let me know if you have further inputs.
regards,
Alberto

Hello Alberto,

Did this answer your question? If so, please click the green "This Resolved My Issue" button.

Regards,

James

MSP Customer Applications