nand2/07_Operating_System/01_GPIO_Test

GPIO.jack

This library provides access to BUT and LED.

GPIO-Test

In the Testfolder 01_GPIO_Test you find a minimal version of Sys.jack containing the init function Sys.init(), which is called after starting JACK-OS. Sys.init() is the JACK-OS version of leds.asm, which reads the BUT and writes the values to LED in an endless loop:

class Sys {

    function void init() {
        do GPIO.init(4096);
        while (true){
            do GPIO.writeLed(GPIO.readBut());
        }        
        return;
    }
}

---

Project

• Implement GPIO.jack

• Test in simulation:

  $ cd 01_GPIO_Test
  $ make
  $ cd ../00_HACK
  $ apio clean
  $ apio sim
  

  The test bench will simulate the pushing of BUT1/2. Check if the LED change accordingly.

  

• run in real hardware with HACK build at 06_IO_Devices/05_GO (together with the bootloader). Build and upload GPIO_Test to iCE40HX1K-EVB with:

  $ cd 01_GPIO_Test
  $ make
  $ make upload
  

• push buttons BUT on iCE40HX1K-EVB and check the LED.