stm32g0b1 swd interface not working

[prekop]

Hello community,

we made a nice project with TouchGFX and STM32G071C8. We needed increase flash memory. We change mcu to STM32G0B1CE. 

I cannot this mcu programming over SWD. I use various STM ARMs, has never been such a problem. I test two new mcu with the same result. I checked waveform signals, reseting modes, speed, programmer FW, i have read a test all advice from forums. I decode protokol - without response from MCU. - No STM targed found.

Response on SWDIO from mcu is nothing (it is still HI). The mcu is only on power supply, all GPIO are free, but consuption is interesting: 12mA, by holding NRESET  was 1,5mA. Both pieces.

Please can You me help?

[prekop]

Hello after a long time i tested programing over SWD these STM32G0:

3x STM32G0B1CET6 (TQFP48) from different suppliers - without succes

STM32G0B0CET6 (TQFP48), STM32G0B1CEU6 (QFN48), STM32G0B1RET6(TQFP64), STM32G0C1CET6 (TQFP48) - everyone worked.

So I was unlucky. Also we tested hundreds STM devices in machines. We have experience that when testing in 60°C for 24°C, then it breaks down, for no reason, some periphery (ADC, GPIO..) to 1% MCUs.

Thank You for Your help!

[Peter BENSCH]

Well, you shouldn't put several different problems in one thread because you can't answer them together and later readers get confused.

To stay with the difficulties with programming via SWD: there is no logical connection to the programmability with different STM32G0B/C if you have used an original ST-LINK. The only other idea I currently have is that RDP Level 2 is already set on the ones that don't work.

Regards
/Peter