Hi,
i am using the mcp23s17 overlay like this.
My spi bus where it is connected is 1 and the CS 0. The INTA is connected to GPIO16.
When i use gpiomon i get the folling output
So i take pin 3 to ground.
My question now is, how can i permanently say that the pin is active_low.
And how can i use for example java pi4j PIGPIO or LINUX FS
PiGpioDigitalInputProvider.newInstance(piGpio),
PiGpioDigitalOutputProvider.newInstance(piGpio)
to read / write the IOs.
And what is the name of GPIOs?
So the IOs starts on base 488 till 503. But how can i bind them to input listener or output writer?
Thanks for your help.
i am using the mcp23s17 overlay like this.
My spi bus where it is connected is 1 and the CS 0. The INTA is connected to GPIO16.
Code:
dtoverlay=mcp23s17:s17-spi1-0-present,s17-spi1-0-int-gpio=16Code:
gpiomon gpiochip2 3event: FALLING EDGE offset: 3 timestamp: [ 895.580064007]event: FALLING EDGE offset: 3 timestamp: [ 895.659337875]event: FALLING EDGE offset: 3 timestamp: [ 896.010151430]event: RISING EDGE offset: 3 timestamp: [ 896.016530761]My question now is, how can i permanently say that the pin is active_low.
Code:
gpioinfo gpiochip2gpiochip2 - 16 lines: line 0: unnamed unused input active-high line 1: unnamed unused input active-high line 2: unnamed unused input active-high line 3: unnamed unused input active-high line 4: unnamed unused input active-high line 5: unnamed unused input active-high line 6: unnamed unused input active-high line 7: unnamed unused input active-high line 8: unnamed unused input active-high line 9: unnamed unused input active-high line 10: unnamed unused input active-high line 11: unnamed unused input active-high line 12: unnamed unused input active-high line 13: unnamed unused input active-high line 14: unnamed unused input active-high line 15: unnamed unused input active-highPiGpioDigitalInputProvider.newInstance(piGpio),
PiGpioDigitalOutputProvider.newInstance(piGpio)
to read / write the IOs.
And what is the name of GPIOs?
Code:
grep -d skip . /sys/class/gpio/*/*/sys/class/gpio/gpiochip0/base:0/sys/class/gpio/gpiochip0/label:pinctrl-bcm2711/sys/class/gpio/gpiochip0/ngpio:58/sys/class/gpio/gpiochip488/base:488/sys/class/gpio/gpiochip488/label:mcp23s17.0/sys/class/gpio/gpiochip488/ngpio:16/sys/class/gpio/gpiochip504/base:504/sys/class/gpio/gpiochip504/label:raspberrypi-exp-gpio/sys/class/gpio/gpiochip504/ngpio:8Thanks for your help.
Statistics: Posted by mistermaek — Thu Feb 29, 2024 12:38 pm
