This post is all about GPIO pin numbering to use with SysFS. In this post, I have mapped all the pins of Nano Pi S2 so that the GPIO can be easily accessed using SysFS. The pins are mapped according to the following formula,
sysfs pin number- X(GPIOX)+Y(GPIOXY)
Where,
X value depends on the GPIO group and is like below
GPIOA: 0
GPIOE: 128
GPIOALV: 160
GPIOB: 32
GPIOC: 64
GPIOD: 96
and Y is the pin number next to GPIO group name
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Pin# Name Pin# Name 1 SYS_3.3V -- 2 VDD_5V -- 3 I2C0_SDA/GPIOD2 98 4 VDD_5V -- 5 I2C0_SCL/GPIOD3 99 6 DGND -- 7 GPIOD8/PPM 104 8 UART3_TXD/GPIOD21 117 9 DGND -- 10 UART3_RXD/GPIOD17 113 11 UART4_TX/GPIOB29 61 12 GPIOD1/PWM0 97 13 GPIOB30 62 14 DGND -- 15 GPIOB31 63 16 GPIOC14/PWM2 78 17 SYS_3.3V -- 18 GPIOB27 69 19 SPI0_MOSI/GPIOC31 95 20 DGND -- 21 SPI0_MISO/GPIOD0 96 22 UART4_RX/GPIOB28 60 23 SPI0_CLK/GPIOC29 93 24 SPI0_CS/GPIOC30 94 25 DGND -- 26 GPIOB26 58 27 I2C1_SDA/GPIOD5 101 28 I2C1_SCL/GPIOD4 100 29 GPIOC8 72 30 DGND -- 31 GPIOC7 71 32 GPIOC28 92 33 GPIOC13/PWM1 77 34 DGND -- 35 SPI2_MISO/GPIOC11 75 36 SPI2_CS/GPIOC10 74 37 AliveGPIO3 163 38 SPI2_MOSI/GPIOC12 76 39 DGND -- 40 SPI2_CLK/GPIOC9 73
Schematic of NanoPi S2 SBC: http://bit.ly/2qbp7UT
Checkout NanoPi S2: http://bit.ly/2ptw7xM
NanoPi S2 WiKi: http://bit.ly/2lvM1lC
Some sysfs examples:
A simple script to access GPIOD8 / 104 and blink LED connected to it for 10 times. For other GPIO change accordingly.
#! /bin/bash
cd /sys/class/gpio
echo 104 > export
cd gpio104
echo “out” > direction
for i in {1..10}
do
echo 0 > value
sleep 1
echo 1 > value
sleep 1
done
cd ..
echo 104 > unexport
Check out my YouTube channel for other video tutorials.
Developer, Tinkere, a proud Dad.. love to spend my available time playing with Tech!!
