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msemegen · 2023-10-25

Hi,What error on HSE frequency is acceptable by STM32WB35? More than 1 kHz can disturb connection process (its interrupted or it's slow than usual on some phones) or can cause unexpected disconnection? Does this affect the range of the advertisement ...

msemegen · 2023-02-07

Hi,it is ok to call hci_user_evt_proc function (STM32WB), from an interrupt, for example SysTick_Handler ?Best,s.mateusz

msemegen · 2023-01-25

Hi,For stm32wb flash operations we have to implement diagram described in AN5289, page 36. How about option bytes access? Do we have apply the same approach, with semaphores etc? Or we just can use regular HAL functions? Best,Mateusz

msemegen · 2022-10-24

Hi,we have problem with our custom designed board. We are using STM32L011F4P6 MCUs and some of them behaves very strange. After reset, every 400ms for 50us, reset pin (which is internally pulled up), goes down. We don't known what causes that behavio...

msemegen · 2022-09-01

I expirence very strange behavior on STM32WB. After 6 connect/disconnect sequences, CPU2 stops working. I'm not receiving any IPPC interrupts. Last event I get, before CPU2 stuck, is ACI_ATT_EXCHANGE_MTU_RESP_VSEVT_CODE. I tried to call hci_reset fun...

msemegen · 2024-01-08

We don't experience any suspicious behavior related to this. So I think it's safe to have that ble event handler in SysTick ISR. Best,Mateusz

msemegen · 2023-10-25

According to this calculator https://www.everythingrf.com/rf-calculators/ppm-to-hz-calculator currently we are at 57 ppm level (~18000 Hz). Using hse tune techniques we can lower it to 47 ppm (which is a little bit lower than maximum error). 47 ppm w...

msemegen · 2023-01-25

Great,Thank you for answer!Best,Mateusz

msemegen · 2023-01-25

"In a multi-CPU system it is good practice to use semaphores to manage option programming, and prevent simultaneous option programming by the CPUs."Which semaphore can be used? Sem2 ("FLASH - All registers")? Best,Mateusz

msemegen · 2022-10-30

We are using CubeMXProgrammer as a flashing tool. MCUs are from trusted discribution channels. This is first time we encountered that behavior. We used the same hw design for other L0 family MCUs (L011K4, L010RBT6) with changes related to differen...

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STM32WB HSE tune

hci_user_evt_proc call in interrupt for STM32WB

STM32WB + option bytes setting

Reset pin goes down every 400ms for 50us

STM32WB CPU2 stops after several connect/disconnect sequences

Re: hci_user_evt_proc call in interrupt for STM32WB

Re: STM32WB HSE tune

Re: STM32WB + option bytes setting

Re: STM32WB + option bytes setting

Re: Reset pin goes down every 400ms for 50us