arm7 - "signal function" in keil

wrong syntax - it should be something like shown below. You might also look into the 'Measure' example provided with the MDK.

Signal void analog0 (float limit)  {
  float volts;

  printf ("Analog0 (%f) entered.\n", limit);
  while (1)  {          /* forever */
    volts = 0;
    while (volts <= limit)  {
      ain0 = volts;     /* analog input-0 */
      swatch (0.01);    /* wait 0.01 seconds */
      volts += 0.1;     /* increase voltage */
    }
    volts = limit;
    while (volts >= 0.0)  {
      ain0 = volts;
      swatch (0.01);    /* wait 0.01 seconds */
      volts -= 0.1;     /* decrease voltage */
    }
  }
}

wrong syntax - it should be something like shown below. You might also look into the 'Measure' example provided with the MDK.

Signal void analog0 (float limit)  {
  float volts;

  printf ("Analog0 (%f) entered.\n", limit);
  while (1)  {          /* forever */
    volts = 0;
    while (volts <= limit)  {
      ain0 = volts;     /* analog input-0 */
      swatch (0.01);    /* wait 0.01 seconds */
      volts += 0.1;     /* increase voltage */
    }
    volts = limit;
    while (volts >= 0.0)  {
      ain0 = volts;
      swatch (0.01);    /* wait 0.01 seconds */
      volts -= 0.1;     /* decrease voltage */
    }
  }
}

The code shown above doesn't work. Another error appeared:
error: #77-D: this declaration has no storage class or type specifier

I had been trying to use signal functions presented in Keil user's guide...and nothing...

The signal function shown before applies to the uVision simulator and acts much like a script which generates inputs to the simulation. Such funtions are 'compiled' in the simulator environment by a built in parser and.

Trying to compile a 'signal' funtions with the MDK/RVCT compiler makes no sense since it does not know anything about the simulation or 'signal' or 'twatch' etc.