Use CubeProgrammer as UART Mode

[in mozbek we trust]

Hey there,

i want to reach my flash memory through UART. I can do this with ST-Link device but now i want to do it with UART. I use STM32F091CC MCU and as datasheet says i configured the UART pins(PA9-PA10) as Asynchronus UART in CubeMX.

My baud rate is 9600 bits/s- word legth 8bits - parity - even and stop bit is 1.

In boot mode configuration. I try to use all configurations but i cannot reach the flash memory.

I coded all options(set and clear bitss) in main.c program and when i click connect button in cube programmer it gives me an error like that:

Please help me how to solve this problem.

Regards

[Igor Cesko]

There is no need to program the device with any firmware - the UART is used for direct communication with device through embedded bootloader. So - just set device into boot mode (by setting BOOT0 and BOOT1 pins/option bits) and restart it and then connect to device by UART by CubeProgrammer.

Regards

Igor

[in mozbek we trust]

Hey igor i have only physical boot0 pin and it aldreay pulled-up but i am not sure how to set or clear the other selectable pins like nboot0-boot_sel etc.

[Igor Cesko]

In reference manual RM0091 see table in chapter "2.5 Boot configuration". There are two possible configuration how to enter into boot mode: the mode must be "System memory".

1) BOOT_SEL bit = 1, BOOT0 pin =1 , nBOOT1 bit = 1

2) BOOT_SEL bit = 0, BOOT0 bit =0 , nBOOT1 bit = 1

[Tesla DeLorean]

It would need BOOT0 pulled high, or for you to implement the system loader protocol.

In your own application, just use a regular terminal program, and implement something like X-MODEM, or Y-MODEM supported by the terminal. See the IAP examples for how this is done.

[in mozbek we trust]

i pulled high boot0 but if there any solution to make this reprogram flash memory with cube programmer or FLASHER

[Tesla DeLorean]

With BOOT0 High it should work, unless you have other interfaces creating noise on potential input pins. Review AN2606

https://www.st.com/content/ccc/resource/technical/document/application_note/b9/9b/16/3a/12/1e/40/0c/CD00167594.pdf/files/CD00167594.pdf/jcr:content/translations/en.CD00167594.pdf