Toggle GPIO

The following page provides an example of toggling a GPIO.

Setup

So you’ve booted Lumorphix and connected to the REPL as per (if a Beta release) Connect!. You now wish to achieve the ‘Hello World’ of embedded systems, and toggle a GPIO. Simply perform the following:

LUA

import("all")
set_io_type_cfg(PIN1, GPIO_OUT)
set_gpio(PIN1, HIGH)

The PIN1 output should now be high, i.e. VCC (3.3 Volts). That’s all there is to it!

Instead of importing the entire Lumorphix API, the import script section could instead be as follows (the following would minimise memory footprint):

.

LUA

import("set_io_type_cfg")
import("set_gpio")

To set it low again:

LUA

set_gpio(PIN1, LOW)

To toggle it:

LUA

set_gpio(PIN1, TOGGLE)

If you are running Lumorphix as a Beta release, the value of PIN1 (and possibly PIN2, PIN3 - depending upon the Beta Release) will be reflected by the state of an LED. Thus you should notice it turn on and off with the above commands. See the child page of Hardware Targets that corresponds to your target hardware as to which LED(s) reflect which PIN state.

Additional Info

After running the above script, you could review the PIN configuration (below output would be if Core #1 was built with eight I/O):

LUA

[ #1 ] $ cmd
/ list|io_type_cfg

  I/O TYPE CONFIG

    PIN1	: GPIO_OUT
    PIN2	: NONE
    PIN3	: NONE
    PIN4	: NONE
    PIN5	: NONE
    PIN6	: NONE
    PIN7	: NONE
    PIN8	: NONE

References

Connect!

API

Command Mode