# Python Programming using MRAA (gpio\_blink)

Python Programming using MRAA (gpio\_blink)

1. Targeted Hardware    

SOM Version: PICM-001-A1

CB : RuggedBoard-A5D2X

CB Version : RB-A5D2X-V1.1

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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