Automatically Run MATLAB Function on Raspberry Pi After Restart
If you deploy a MATLAB® function on Raspberry Pi®, the function does not start running automatically after the Raspberry Pi is switched on. You must manually start the function by establishing a Secure Shell (SSH) connection with Raspberry Pi through Wi-Fi® or Ethernet.
With the Run-on-boot feature, you no longer need to manually start the MATLAB function. The function runs immediately after the Raspberry Pi is switched on.
The MATLAB function
blinkLED lights a green LED on Raspberry Pi. Open the function in Simulink® editor and deploy it on Raspberry Pi. After the model is deployed successfully, the green LED starts blinking. Now,
restart Raspberry Pi and wait for a few seconds. The green LED does not start blinking because the
function on the hardware is not running.
Now, add your MATLAB deployed function to Run-on-boot as described in Add the MATLAB Function to Run-on-Boot and restart Raspberry Pi. The green LED starts blinking immediately after the restart.
Create a MATLAB Function
blinkLEDfunction and paste it in the MATLAB Editor. The function implements an algorithm to blink the ACT LED on the Raspberry Pi hardware every
function blinkLED() % Create a Raspberry Pi object r= raspi(); % Blink the LED for 100 cycles for count = 1:100 % Turn on the LED writeLED(r,"LED0", 1); % Pause for 0.5 seconds pause(0.5); % Turn off the LED writeLED(r,"LED0", 0); % Pause for 0.5 seconds pause(0.5); end end
Save the function as
blinkLED.mto a folder to which you have write access.
Create a Hardware Configuration Object
Create a hardware configuration object by using the
targetHardwarefunction in the MATLAB Command Window.
board = targetHardware('Raspberry Pi') board = targetHardware with properties: Name: 'Raspberry Pi' DeviceAddress: '126.96.36.199' Username: 'pi' Password: '*********' BuildDir: '/home/pi' EnableRunOnBoot: 0 BuildAction: 'Build, load, and run' CoderConfig: [1×1 coder.CodeConfig]
Passwordproperties listed in the output. If required, change the value of the properties by using dot notation syntax.
For example, to change the device address to
Add the MATLAB Function to Run-on-Boot
You can add or remove a MATLAB function from Run-on-boot by setting the EnableRunOnBoot propertyusing the following MATLAB function:
board.EnableRunOnBoot = true board = targetHardware with properties: Name: 'Raspberry Pi' DeviceAddress: '188.8.131.52' Username: 'pi' Password: '*********' BuildDir: '/home/pi' EnableRunOnBoot: 1 BuildAction: 'Build, load, and run' CoderConfig: [1×1 coder.CodeConfig]
Manage Run-on-Boot Programmatically
You can manage the Run-on-boot feature programmatically using:
: Adds the MATLAB function to Run-on-boot.
: Gets the name of the MATLAB function added to Run-on-boot.
: Removes the MATLAB function from Run-on-boot.
You can add only one function to Run-on-boot. The most recently added function overwrites the existing function in Run-on-boot.
Run-on-boot does not work when the function is running in External mode or Processor-In-The-Loop (PIL).