49 lines
1.2 KiB
Plaintext
49 lines
1.2 KiB
Plaintext
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## GPIO.jack
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This library provides access to `BUT` and `LED`.
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### function void init(int addr)
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Initialize LED (addr) and BUT (addr+1).
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### function int readLed()
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Returns the value of LED.
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### function void writeLed(int c)
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Write c to LED.
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### function int readBut()
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Returns the state of BUT.
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***
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## Project
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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:
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```
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class Sys {
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function void init() {
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do GPIO.init(4096);
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while (true){
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do GPIO.writeLed(GPIO.readBut());
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}
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return;
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}
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}
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```
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* Implement `GPIO.jack`
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* Test in simulation:
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```
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$ cd 01_GPIO_Test
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$ make
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$ cd ../00_HACK
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$ apio clean
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$ apio sim
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```
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The test bench will simulate the pushing of BUT1/2. Check if the LED change accordingly.
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* 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:
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```
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$ cd 01_GPIO_Test
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$ make
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$ make upload
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```
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* push buttons BUT on iCE40HX1K-EVB and check the LED.
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