Python Programming using MRAA (gpio_blink)
Python Programming using MRAA (gpio_blink)
Targeted Hardware
SOM Version: PICM-001-A1
CB : RuggedBoard-A5D2X
CB Version : RB-A5D2X-V1.1
Targeted Software
BSP-Yocto-A5D2X 2019-03-13
AT91Bootstrap-3.8.12
Linux Kernel v4.9.151
uboot-2018-07
Yocto 2.5.2 (sumo HEAD commit 623b77885051)
Description
Here is the simplest OnBoard-Gpio's program in mraa,to toggle three GPIO pins – 61,62,63
Required Hardware
a5d2x-rugged board
USB cable
Step-by-step guide
Connect the Rugged board to your system
Boot the board with SD card/NOR.
Copy the below python file to data directory of rugged board through tftp protocol.
Test On-board LEDs – gpio_blink.py
Open gpio_blinky.py program given below in your board terminal.
Open the gpio_blinky.py program in /data directory.
PROGRAM: gpio_blinky.py
import mraa import time
gpio_1 = mraa.Gpio(61) # set gpio 61 to output gpio_2 = mraa.Gpio(62) # initialise gpio 62 (D4 – Ref: Schematic)
gpio_3 = mraa.Gpio(63) # initialise gpio 63 (D17)
gpio_1.dir(mraa.DIR_OUT) gpio_2.dir(mraa.DIR_OUT)
gpio_3.dir(mraa.DIR_OUT) while True:
gpio_1.write(1)
gpio_2.write(0) gpio_3.write(1)
time.sleep(1)
gpio_1.write(0)
gpio_2.write(1) gpio_3.write(0)
time.sleep(1)
gpio_1.write(0)
gpio_2.write(0)
gpio_3.write(1)
time.sleep(1)
Execution :
Run the above code with below command in rugged board.
root@ruggedboard-a5d2x:/data# python3 gpio_blinky.py
Expected Output:
root@ruggedboard:/data# python3 gpio_blink.py libmraa[145]: libmraa version v2.0.0 initialised by user 'root' with EUID 0 libmraa[145]: gpio: platform doesn't support chardev, falling back to sysfs libmraa[145]: libmraa initialised for platform 'Atmel SAMA5' of type 20 gpio 77 gpio pin 77 gpio 81 gpio pin 81 gpio 83 gpio pin 83 ( NOTE: Toogling of LED's can be seen on the ruggedboard a5d2x).
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