[GitHub] [incubator-nuttx] michallenc edited a comment on issue #4188: nucleo_h743zi2 peripheral use

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michallenc edited a comment 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. Good luck with your experiments with NuttX!


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