Trying to run the Timer example

eden-desta commented 3 years ago

Hello! I am trying to run the timer example following the steps provided here: https://nuttx.apache.org/docs/latest/components/drivers/character/timer.html

The few things that I do that I do not see in the steps, is also selecting a peripheral timer, from the STM32 peripheral tag.

I get the error Failed to open /dev/timer0: 2 when running the example. A quick ls of the /dev shows the following:

console
 null
 ttyS0

Why isnt /dev/timer0 part of this list.

++ I am using a Nucleo-H743ZI2 board with pretty much nothing else running other than the simple timer example. From the link provided i followed the second set of steps via the menuconfig

saramonteiro commented 3 years ago

Hi @eden-desta!

You're not seeing it on your /dev dir because the board bringup function of this board is not calling the function that register the timer drivers. See your board bringup: https://github.com/apache/incubator-nuttx/blob/master/boards/arm/stm32h7/nucleo-h743zi2/src/stm32_bringup.c Take this bringup on ESP32 as an example: https://github.com/apache/incubator-nuttx/blob/master/boards/xtensa/esp32/esp32-devkitc/src/esp32_bringup.c#L227-L249 In your case you should call stm32_timer_initialize to register it.

eden-desta commented 3 years ago

Hi @saramonteiro thank you for your response! I appreciate you!

Okay, so I have made some updates to the stm32_bringup.c file:

#ifdef CONFIG_TIMER
#include <stm32_tim.h>
#endif

....

#ifdef CONFIG_TIMER
  ret = stm32_timer_initialize("/dev/timer0", 0);
  if (ret < 0) {
    syslog(LOG_ERR, "ERROR: Failed to initialize timer driver: %d\n", ret);
  }
#endif

And i get the following error:

/home/eden/nuttx/nuttx/boards/arm/stm32h7/nucleo-h743zi2/src/stm32_bringup.c:185: undefined reference to `stm32_timer_initialize'
collect2: error: ld returned 1 exit status
make[1]: *** [Makefile:156: nuttx] Error 1
make[1]: Leaving directory '/home/eden/nuttx/nuttx/arch/arm/src'
make: *** [tools/Makefile.unix:422: nuttx] Error 2

I noticed that the esp32_bringup.c includes #include <esp32_tim_lowerhalf.h> which is not available for the stm32 boards. So in an effort to see if perhaps this can be something I can work around, i imitated that esp32_tim_lowerhalf.h file and made an stm32_tim_lowerhalf.h file that I included in the bringup instead. I removed the stm32_timer_initialize function from the stm32_tim.h file and moved it to the new lowerhalf. When i built it, it said that the stm32_tim_lowerhalf.h files does not exist.

stm32_bringup.c:43:10: fatal error: stm32_tim_lowerhalf.h: No such file or directory
   43 | #include "stm32_tim_lowerhalf.h"
      |          ^~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
make[2]: *** [/home/eden/nuttx/nuttx/boards/Board.mk:103: stm32_bringup.o] Error 1
make[2]: Leaving directory '/home/eden/nuttx/nuttx/boards/arm/stm32h7/nucleo-h743zi2/src'
make[1]: *** [Makefile:152: board/libboard.a] Error 2
make[1]: Leaving directory '/home/eden/nuttx/nuttx/arch/arm/src'
make: *** [tools/Makefile.unix:422: nuttx] Error 2

So stuck on two avenues with a little bit of uncertainty which way is the right way to go about moving forward

apache / nuttx-apps

Trying to run the Timer example #834