About SPopo.4

SPopo.4 · 2023-05-23

I have board with STM32F4 Microcontrollers. I am using USART and STM Bootloader in order to flash one of these chips. Is there anywhere recommended procedure to go for?

SPopo.4 · 2023-05-17

I am using STM32F407 and want to use USART interface to flash MCU using bootloader. I have external 25MHz oscillator connected to the MCU.I've noticed that there is drastic difference in booting delay time I need to implement on different bootloader ...

SPopo.4 · 2023-05-23

Hello Foued, Thanks for a quick reply. I am very familiar with these documents, but unfortunately they don't have a recommended procedure. These documents have protocol and explanation of different functions, versions of bootloaders, but don't have r...

SPopo.4 · 2023-05-19

Isn't there activity on other pins related to bootloader, which may mislead the bootloader and result in timeouts? -> I do control Boot0 pin, but much earlier in the process of flashing and reseting, it won't effect the bootling time. I also have som...

SPopo.4 · 2023-05-17

How - I toggle down and up NRST pin.When - Before I start counting delay)So for Bootloader 3.1Reset -> wait 100ms -> send 0x7F through UART -> receive ACK works finefor Bootloader 9.1Reset -> wait 400ms -> send 0x7F through UART -> receive ACK works ...

SPopo.4 · 2023-05-17

How drastic? - Around 300ms.What are those delays, are they different from 74ms/85ms? - Around 100ms for Bootloader 3.1 and 400ms for Bootloader 9.1. How exactly do you measure that - do you measure it from the end of reset? - I measure it by trying ...

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Recommended procedure for flashing STM32 using USART?

Does HSE timeout period affects Bootloader booting time if external oscillator is used?

Re: Recommended procedure for flashing STM32 using USART?

Re: Does HSE timeout period affects Bootloader booting time if external oscillator is used?

Re: Does HSE timeout period affects Bootloader booting time if external oscillator is used?

Re: Does HSE timeout period affects Bootloader booting time if external oscillator is used?