µVision4 User's Guide

Interrupt Signal

The following signal function generates GPIO interrupt signals on 2 pins.

/*----------------------------------------------------------------------
  Generates a number of pulses on GPIO 0.14 and GPIO 1.24
----------------------------------------------------------------------*/
SIGNAL void GPIO_0_14_Square (unsigned int pulses)  {

  printf ("%d Square Pulses on GPIO 0.14\n", pulses);

  PORT0 = 0x0;
  PORT1 = 0x0;
  while (pulses--)
  {
    PORT0 |=   (1 << 14);          // set    pin 0.14
    swatch (0.02);
    PORT1 &=  ~(1 << 24);          // reset  pin 1.24
    swatch (0.01);
    PORT1 |=   (1 << 24);          // set    pin 1.24
    PORT0 &=  ~(1 << 14);          // reset  pin 0.14
    swatch (0.02);
  }
}


GPIO_0_14_Square (100);            // 100 Pulses at debugger startup

DEFINE BUTTON "EINT1 10  Pulses", "GPIO_0_14_Square (10)"
DEFINE BUTTON "EINT1 100 Pulses", "GPIO_0_14_Square (100)"

Start debugging in simulation mode and drag the port into the Logic Analyzer. Open the Toolbox and click the buttons EINT1 10 Pulses or EINT1 100 Pulses to view the signal output on the pins of PORT0.14 and PORT1.24:

The above setting generates the following signal on PORT0. The Logic Analyzer output shown is generated with the example project Using Interrupt EINT1 on Keil MCB2100 Board available at www.keil.com/download.