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apache / nuttx-apps

Apache NuttX Apps is a collection of tools, shells, network utilities, libraries, interpreters and can be used with the NuttX RTOS
https://nuttx.apache.org/
Apache License 2.0
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STM32H7 does not have the a functioning Timer driver #835

Open eden-desta opened 2 years ago

eden-desta commented 2 years ago

Related to https://github.com/apache/incubator-nuttx-apps/issues/834

I was trying to determine a way to use the timer with my NUCLEOH743ZI2 board. Following the guidelines provided in the above issue, I was still experiencing some problems. I did a deep dive into the what the ultimate cause of the problem was. This is as follows:

When navigating to nuttx -> arc -> arm -> src -> stm32 This folder contains a stm32_tim_lowerhalf.c file that defines the function stm32_timer_initialize which we need in order to get any timer up and operating. However in the stm32h7 folder found in the same location as the stm32 folder I noticed that the stm32_tim.h file defines it, but the stm32_tim.c file does not integrate it. Additionally, the stm32_tim_lowerhalf.c file does not exist.

Ultimately, this cause the startup.c file to fail on calling the stm32_timer_initialize function as it does not think that it exists. I am unsure how to go about using timers with the H7 board.

Any thoughts, or feedback would be great! Thank you for your time!

saramonteiro commented 2 years ago

Yes. It seems the timer is still not completed on smt32h7. The low level functions are implementes in nuttx/arch/arm/src/stm32h7/stm32_tim.c but it's missing to implement the lowerhalf. The stm32_timer_initialize is only declared but not defined for stm32h7. You should define it, and the other lowerhalf operations, on the lowerhalf file.

acassis commented 2 years ago

Hi @eden-desta the stm32h7 is a new port and is missing some pieces of code. The good news is H7 is very similar to F7, so I suggest to to use the stm32_tim_lowerhalf.c from stm32f7 and double check the registers address in the datasheet. It is pretty easy to do. If you need some help, please subscribe to NuttX mailing list, see here: https://nuttx.apache.org/community/ Also, this weekend will have the NuttX Online Workshop, case you are not aware of it. Felipe will talk about microROS on ESP32. You can get more info here: https://nuttx.events

eden-desta commented 2 years ago

Amazing, thank you both @acassis and @saramonteiro! I will try and get this going asap.

@acassis just confirming this is the datasheet i should refer to: https://www.st.com/resource/en/datasheet/stm32h753ii.pdf well this is technically the newest version of the H7.

acassis commented 2 years ago

No, I said datasheet, but the register are describe in the Reference Manual: https://www.st.com/en/microcontrollers-microprocessors/stm32h753ii.html#documentation

acassis commented 2 years ago

Don't get afraid of its more than 3000 pages, you just need to look at timer related registers page

eden-desta commented 2 years ago

Amazing found it! Thank you!