(* Copyright (C)2018-2023, Philip Munts dba Munts Technologies.                *)
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(* modification, are permitted provided that the following conditions are met: *)
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MODULE test_enviro_phat_adc;

FROM STextIO IMPORT WriteString, WriteLn;
FROM SWholeIO IMPORT WriteCard;
FROM SRealIO IMPORT WriteFixed;
FROM FIO IMPORT FlushOutErr;

FROM Enviro_pHAT IMPORT AIN, ReadVoltage;
FROM ErrorHandling IMPORT CheckError;
FROM liblinux IMPORT LINUX_usleep;

VAR
  channel : CARDINAL;
  voltage : REAL;
  error   : CARDINAL;

BEGIN
  WriteLn;
  WriteString("Raspberry Pi Enviro pHAT A/D Test");
  WriteLn;
  WriteLn;
  WriteString("Press CONTROL-C to exit");
  WriteLn;
  WriteLn;
  FlushOutErr;

  LOOP
    FOR channel := 0 TO 3 DO
      ReadVoltage(AIN[channel], voltage, error);
      CheckError(error, "ReadVoltage() failed");

      WriteString("AIN");
      WriteCard(channel, 0);
      WriteString("=");
      WriteFixed(voltage, 2, 4);
      WriteString(" V  ");
    END;

    WriteLn;
    FlushOutErr;

    LINUX_usleep(1000000, error);
    CheckError(error, "LINUX_usleep() failed");
  END;
END test_enviro_phat_adc.