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saks-0.1.1
SAKS hat for raspberry_pi
SAKS = Swiss Army Knife Shield for Raspberry Pi
How other library control GPIO
wiringpi system but uses the /sys/class/gpio interface rather than accessing the hardware directly(softPwmWrite)
sprintf(fName, "/sys/class/gpio/gpio%d/value", i)
- /sys/class/gpio: sysfs_gpio(deprecated), gpio(deprecated), maybe not working in pi4B
- /dev/gpiomem or /dev/gpiochip0: rppal, wiringpi, gpio-cdev
- /dev/pigpio and pigpio daemon process: pigpio
Some questions need to solve
- Why gpio access from /dev/gpiomem via mmap syscall is faster than
format!("/sys/class/gpio/gpio{}/active_low", gpio_num) - Why gpio pin number has three encoding?(BOARD, BCM, wiringpi)
- About the onboard_led(/sys/class/leds/led0/) like arduino's LED_BUILTIN
BOARD, BCM and wiringpi encoding
My raspberry_pi notes
cli tools
CPU temperature
vcgencmd measure_temp
Remap caps to backspace
setxkbmap -option caps:backspace
Setup raspberry_pi
How to connect raspberry_pi without internet/display/GUI Desktop?
- put empty ssh file to SD card root directory in order to enable SSH on first time boot
- SSH to pi via ethernet cable or serial(RS-232 with RXD+TXD+GND, don't connect 5V pin!) port