Hey everyone,
today I wanted to use UART2 on my STM32F0 Disovery board and configured PA14 and PA15 to be used as TX and RX pins, which was indicated in the datasheet. Unfortunetely I missed, that PA13 is part of the SWD pin interface and so, since I uploaded that code through OpenOCD succesfully, I can't connect anymore through SWD.
Does anyone have a hint on how to overcome this issue? I searched but couldn't really find a solution right now.
Thanks for the help!
Greeting
Stefan
locked out from SWD on STM32F0 Discovery
Moderator: RoccoMarco
Re: locked out from SWD on STM32F0 Discovery
OK, just found out that I can use the bootloader to push a the flash code into the chip using UART1, which is explained in AppNote AN2606 "STM32â„¢ microcontroller system memory boot mode".
Will try this with the Discovery board tomorrow since I have to desolder SB2 for that to unlock the permanent boot up from flash.
By the way, this way you can configure the chip to load program from SRAM. This means not everytime to actually flash the 1000x writable flash memory.
Here is a nice tool for such cases, including wiring for an adapter: http://www.firefly-power.de/ARM/sloadhost.html
Will keep the issue posted here.
Cheers
Stefan
Will try this with the Discovery board tomorrow since I have to desolder SB2 for that to unlock the permanent boot up from flash.
By the way, this way you can configure the chip to load program from SRAM. This means not everytime to actually flash the 1000x writable flash memory.
Here is a nice tool for such cases, including wiring for an adapter: http://www.firefly-power.de/ARM/sloadhost.html
Will keep the issue posted here.
Cheers
Stefan
Re: locked out from SWD on STM32F0 Discovery
it's simple, press the reset button and start your stlink program.
Once the program tries to connect, release the reset button.
The program will halt the MCU at start so you'll be able to debug it.
Once the program tries to connect, release the reset button.
The program will halt the MCU at start so you'll be able to debug it.
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Giovanni
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Re: locked out from SWD on STM32F0 Discovery
The first thing to do after connecting should be a global erase.
BTW, I didn't know the reset trick, thanks.
Giovanni
BTW, I didn't know the reset trick, thanks.
Giovanni
Re: locked out from SWD on STM32F0 Discovery
Hey everyone,
finally got this done now.
After wasting time with manually usingthe bootloader, I used the Flash Loader Demonstrator tool.
Actually the STM32 bootloader itself and it commands is described in AppNote AN3155.
For this I desoldered the SB2, which always pulled the BOOT0 pin high. I needed to be pulled down during RESET.
Then I attached a MAX232 (actually from AVR STK500) to USART1 pins and hold the USART2 RX pin low (all described in the earlier mentioned AppNote AN2606).
Then the ST tool found the STM32F051R8 and all went just fine guided by the tool (including a global erase and verifying). One can change option bits using this tool, this way it should be possible to implement this RAM/Flash programming thing.
Leaving this here for docu purposes.
Thanks for the answers.
Cheers
Stefan
finally got this done now.
After wasting time with manually usingthe bootloader, I used the Flash Loader Demonstrator tool.
Actually the STM32 bootloader itself and it commands is described in AppNote AN3155.
For this I desoldered the SB2, which always pulled the BOOT0 pin high. I needed to be pulled down during RESET.
Then I attached a MAX232 (actually from AVR STK500) to USART1 pins and hold the USART2 RX pin low (all described in the earlier mentioned AppNote AN2606).
Then the ST tool found the STM32F051R8 and all went just fine guided by the tool (including a global erase and verifying). One can change option bits using this tool, this way it should be possible to implement this RAM/Flash programming thing.
Leaving this here for docu purposes.
Thanks for the answers.
Cheers
Stefan