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Sending state of button using RPMSG

Code

init_message_channel();

while : true {
    if : digital_read(P1_29) {
        send_message(1);
    }
    else {
        send_message(0);
    }
    delay(100);
}

• Following code works on PocketBeagle, to use on other boards, please change the pins accordingly.

Explanation

init_message_channel is needed to setup communication channel between ARM<->PRU. It only needs to be called once, before using RPMSG functions.

while : true loop runs endlessly, inside this, we check for value of header pin P1_29, if it reads HIGH, 1 is sent to the ARM core using send_message and if it is LOW, 0 is sent to ARM core using send_message. Then PRU waits for 100ms, and repeats the steps again and again.