Peripheral Simulation

For Texas Instruments LM3S1968 — Analog/Digital Converter (ADC)

Simulation support for this peripheral or feature is comprised of:

• Dialog boxes which display and allow you to change peripheral configuration.
• VTREGs (Virtual Target Registers) which support I/O with the peripheral.

These simulation capabilities are described below.

Analog/Digital Converter Dialog

ADCx Input Voltage VTREG
Data Type: float

The ADCx VTREGs set the analog input voltages for simulated A/D converters. The ADCx VTREGs represent the inputs to the analog input pins of the MCU for analog input 0, 1, 2, and so on. ADC0 sets the input voltage for analog input #0, ADC1 sets the input voltage for analog input #1, etc. If you have properly configured the analog inputs, the following commands (typed in the debugger's Command Window) input the voltages specified.

ADC0 = 0.000  /* Analog Input 0 = 0.000 volts */
ADC1 = 2.500  /* Analog Input 1 = 2.500 volts */
ADC2 = 4.999  /* Analog Input 2 = 4.999 volts */

You may create a debugger signal function to periodically change the value of the A/D input. The following signal function increases the A/D Channel 1 input voltage by 0.1 volts each second.

signal void ADC1_sig (void) {
float f;

for (f = 0.0; f < 5.0; f += 0.1)
  {
  swatch (1.0);                  // Delay 1 second
  ADC1 = f;                      // Set ADC1 Voltage
  }
}