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STM32H7 does not have the a functioning Timer driver
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!
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.
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
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.
No, I said datasheet, but the register are describe in the Reference Manual: https://www.st.com/en/microcontrollers-microprocessors/stm32h753ii.html#documentation
Don't get afraid of its more than 3000 pages, you just need to look at timer related registers page