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AM2634: ADC reset problem

Part Number: AM2634


Tool/software:

environment: CCS12.7 sdk9.0.02  demo: adc_multiple_soc_epwm_am263x-lp-nortos     hardware: 2634lp  red demo board

When I first ran the example program and it worked properly, I could see the ADC value. With nothing changed, I ran the example again,(right click AM263x.ccxml->debug->CPU reset->load program->choose project->run)

The code stop at line 115 in adc_multiple_soc_epwm.c

/* Wait until required number of ADC conversions are completed */
while( gAdcConversionCount < ADC_CONVERSION_COUNT );

can see "[Cortex_R5_0] ADC EPWM Triggered Conversion Test Started ..."in console and no ADC value.

Must power off the board then the example program can work properly, why?