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aen-analog-validate

On-silicon analog validation: drive a voltage out of DAC0 and read it back through the ADC in a closed loop, using the portable <alp/dac.h> + <alp/adc.h> surfaces. RESULT PASS on E8.

Source: examples/aen/aen-analog-validate/.

What it does​

  1. Opens DAC0 and writes a sweep of millivolt setpoints.
  2. Reads each back on the wired-loopback ADC channel and checks the match within tolerance.

The bench pinned down the correct Alif E8 references — DAC 0.750 V (DAC12_VREF_CONT=0x4) and ADC 1.8 V (ADC_VREF_CONT=0x10, RDIV=0), both grounded in hal_alif's analog_ctrl.h. This also repaired a latent build break: the four alif,adc nodes had been missing the #io-channel-cells that adc-controller.yaml requires.

board.yaml​

som:
  sku: E1M-AEN801

preset: e1m-evk

cores:
  m55_he:
    app: ./src
    peripherals: [adc, dac]

diagnostics:
  log_level: info

Expected output​

[aen-analog-validate] DAC0 = 375 mV  ->  ADC = 372 mV  (PASS)
[aen-analog-validate] DAC0 = 750 mV  ->  ADC = 748 mV  (PASS)
[aen-analog-validate] RESULT PASS

See also​

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