This is the latest (main) BeagleBoard documentation. If you are looking for stable releases, use the drop-down menu on the bottom-left and select the desired version.

Sending state of button using RPMSG

Sending state of button using RPMSG



while : true {
    if : digital_read(P1_29) {
    else {
  • Following code works on PocketBeagle, to use on other boards, please change the pins accordingly.


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.