MangoPi-R3 Development Board Example Code for GPIO Control

The article offers a detailed guide on how to control GPIO pins on a Mango-Pi board. It includes example code demonstrating GPIO mapping, direction setting, and output level control using sysfs and the Pinpong library, with practical examples like making an LED blink and controlling its state with a button.

Requirements

Mango-Pi board with firmware burned ×1
Button ×1
LED ×1

GPIO mapping relationship under sysfs file system

Mapping pin formula: 32×pin group serial number + pin sub-number = mapped pin number

Pin Group

Pin Classification	Mapped Serail Number
Pin start with PA	0
Pin start with PB	1
Pin start with PC	2
Pin start with PD	3
Pin start with PE	4
Pin start with PF	5

And so on.

Example

Example 1: Suppose you want to operate the pin PE4

The serial number of PE is 4

The corresponding position of PE4 is the fourth pin under PE

Plug it into the formula, you get: 32×4+4=132

Which is, PE4 mapped to GPIO is pin 132
Example 2: Suppose you want to operate the pin PA6

The serial number of PA is 0

The corresponding position of PA4 is the sixth pin under PA

Plug it into the formula, you get: 32×0+6=6

Which is, PA6 mapped to GPIO is pin 6
Example 3: Suppose you want to operate the pin PF1

The serial number of PF is 5

The corresponding position of PF1 is the first pin under PF

Plug it into the formula, you get: 32×5+1=161

Which is, PF1 mapped to GPIO is pin 161

Start Mapping

Export the GPIO we need

# ls /sys/class/gpio
export  gpiochip0  unexport
# echo 132 > /sys/class/gpio/export
# ls /sys/class/gpio/
export     gpio132    gpiochip0  unexport

Set GPIO as output direction

echo out > /sys/class/gpio/gpio132/direction

Set the output level of GPIO

echo 1 > /sys/class/gpio/gpio132/value # Set GPIO output high level
echo 0 > /sys/class/gpio/gpio132/value # Set GPIO output low level

Set GPIO as input direction

echo in > /sys/class/gpio/gpio133/direction

Read GPIO level in the input mode

#cat /sys/class/gpio/gpio133/value
1

Delete GPIO configuration file

#echo 132 > /sys/class/gpio/unexport
#ls /sys/class/gpio
export  gpiochip0  unexport

Control GPIO via Pinpong

Blink(Output mode test)

Make the LED blink.

import time
from pinpong.board import Board, Pin

b = Board("F1C")
b.begin()
led = Pin(3, Pin.OUT)

while True:
    led.value(1)
    time.sleep(1)
    led.value(0)
    time.sleep(1)

Test Result

Connect an LED light to pin 131 (PE3)

The LED flashes after running the program.

Button(Input mode + output mode test)

Turn on/off the LED.

import time
from pinpong.board import Board, Pin

pyb = Board("PYB").begin()
btn = Pin(130, Pin.IN)
led = Pin(131, Pin.OUT)

while True:
    v = btn.value()
    print(v)
    led.value(v)
    time.sleep(0.1)

Test Result

Connect an LED light to pin 131 (PE3); Connect a button to pin 130 (PE2)

After running, you can turn on and off the LED lights by pressing the button

Example Code for Mango-Pi-GPIO Control