About VMiki.1

VMiki.1 · 2022-04-26

I'm using the STM32F769-DISC0 development board and am utilizing the DWT->CYCCNT to calculate cpu load as well as using it as a high speed timer that runs at the clock frequency. When the debugger is plugged in, it functions fine. However, with the d...

VMiki.1 · 2020-11-13

Specifically for the SPC58 -- although it looks like the 56/57 share the same registers. I've reviewed the documentation for the time base registers (TBU/TBL) and have made an attempt to enable it. Leaving the timebase clock (SEL_TBCLK) at the proces...

VMiki.1 · 2020-10-28

I had a functioning TCP/IP application I am trialing on the SPC58EC-DISP discovery board using DHCP. SPC5Studio pulled updates and is not forcing me to migrate to the latest RLA (1.8.2.20200908161300) which breaks some network code -- this was fixed....

VMiki.1 · 2022-05-02

SCB_SCR.SLEEPDEEP is 0, was the first thing I checked. This DWT_CYCCNT behavior is "new to me" for the F7.

VMiki.1 · 2022-04-27

That helped --> SLEEP bit in CR needed to be set and then it works as I've grown used to on the F4. Noted as a difference between the F7/F4. TIM2/TIM5 could be used in max mode to achieve similar results, but my project is going down the path where t...

VMiki.1 · 2022-04-27

So this behavior is different on the F7 vs the F4. The same instruction on the F4 causes the core to "sleep" while the CYCCNT continues as it waits for the instruction. This holds true regardless of debugger status. On the F7 it behaves like the F4.....

VMiki.1 · 2022-04-27

I've found that it is the wfi instruction causing this when the debugger isn't running. Clearly I'm missing something that the debugger is changing and I need to address myself, but not seeing what it is?

VMiki.1 · 2022-04-27

It appears the wfi instruction is the culprit, although I do not understand why and cannot find any explanation in either ST's user guide or in the ARM M7 Reference manual that would explain the "pause" of the CYCCNT. I put together a very basic appl...

User statistics

User Activity

STM32F769 DWT CYCCNT

SPC5 Timebase Example?

SPC58 Network RLA/DHCP Issue

Re: STM32F769 DWT CYCCNT

Re: STM32F769 DWT CYCCNT

Re: STM32F769 DWT CYCCNT

Re: STM32F769 DWT CYCCNT

Re: STM32F769 DWT CYCCNT