michallenc commented on issue #4188: URL: https://github.com/apache/incubator-nuttx/issues/4188#issuecomment-883605655
Hello, I think the problem is that you do not register the device /dev/userleds/ in board level code. If you take a look into this part of code for Teensy 4.1 board https://github.com/apache/incubator-nuttx/blob/master/boards/arm/imxrt/teensy-4.x/src/imxrt_appinit.c#L72, you can see that I call function userled_lower_initialize(LED_DRIVER_PATH) where LED_DRIVER_PATH is "/dev/userleds". That part of the code registers the device. If you write something like that into boards/arm/stm32h7/nucleo-h743zi/src/stm32_appinitialize.c, then it should do the trick. If you then run NuttX and execute command "ls dev/", you should see "userleds" there and the application should also be working. You also have to turn off CONFIG_ARCH_LEDS (this options use the led to show the status of NuttX - if it is turn on, NuttX is running, if the led is blinking then there was some problem with booting) in order to use user led. I actually had the exactly same issue when I was beginning with NuttX. :) Most of the NuttX peripherals have to be registered in board level section. It is usually done by calling function in architecture level and/or registering the device. If you take a look at this file https://github.com/apache/incubator-nuttx/blob/master/boards/arm/stm32h7/nucleo-h743zi/src/stm32_pwm.c, the pwm is initialized by calling stm32_pwminitialize() which is defined in arch/arm/src/stm32h7/stm32_pwm.c and then the device is register by pwm_register("/dev/pwm0", pwm) which is defined in drivers/timers/pwm.c. The same process is usually done with other peripherals (CAN, encoder, I2C and so on). I hope this helps. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: commits-unsubscr...@nuttx.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
