About sholojda

sholojda · 2024-08-12

Hiwhat is the relationship between the speed of the CPU and the GPIO response. for example, I have a CPU clock of 72MHz and a GPIO clock of 36MHz and I set the pull-up when is this pull-up visible to the CPU because e.g. I would like to read the port...

sholojda · 2024-02-05

Hi.I an looking for some info about CoreDebug and DWT registers in M3 and M4 series. Can you tell me where i can read about it? There is nothing about it in RM

sholojda · 2024-01-16

Hi.I'm looking for some answer which I can not find anywere.What is the time between instruction execution time consisting of writing '1' to GPIO->BSRR of any pin and port and real mcu pin state in case when HCLK is e.g. 72MHz and APB2 is 4,5MHz (APB...

sholojda · 2023-06-04

Hi.I have in my hand Nucleo with STM32F103 (old uC but to understand grouping newer is not needed).In Programming Manual PM0056 on page 134 and 135 I can see a SC_AIRCR register which on PRIGROUP field at reset are all zeros, but on next page in tabl...

sholojda · 2022-05-09

I have created a pointer to function like void (*MyFun)(void); and I assigned first time 0x00000000 and the second time 0x08000000. in both cases after call MyFun(); I get HardFault error.Why? PS. This is simple project created in CubeIDE (default pr...

sholojda · 2024-08-19

I think I was misunderstood.I had something like that in mind for examle: 1. Port was set as output2 Change port to input3. Read input port. And now ic CPU clock is twice as fast as peripheral clock, can I read the value from the port?

sholojda · 2024-01-17

>>Why so slow on the APB?This was only as an example to show that this two buses are clocked in different speed, because if they would have the same clock speed it would be is easier to understand,

sholojda · 2023-06-05

I have read ARM TRM and according to that if PRIGROUP is b000 number of pre-emptition piorities should be 128 and 2 subprorities but STM32 has only 16 levels so there is something wrong?!

sholojda · 2023-05-28

Can you give a link, i can not find it.

sholojda · 2022-05-11

Can you tell me how to create a pointer to pointer for fuction? Like in this example.Address 0x08000004 holds address to code execute. How to use it?

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STM32 CPU clock vs GPIO clock

CoreDebug and DWT registers in STM32F103 and STM32F411 (M3 and M4)

what is port output speed in STM32

NVIC and Piority Grouping in STM32 after reset

Why I can not call function from address 0x00000000 or 0x08000000?

Re: STM32 CPU clock vs GPIO clock

Re: what is port output speed in STM32

Re: NVIC and Piority Grouping in STM32 after reset

Re: Toolchains for STM32

Re: Why I can not call function from address 0x00000000 or 0x08000000?