Is it possible to debug STM32F0 chip with Discovery embedded ST-LINK when Vddio2 is powered by 1.8V?

[WMa�?]

Hello,

I am trying to debug STM32F072 chip using ST-LINK on mb1076 Discovery board.

STM32F072 is on custom board. It is powered from 3.3V except Vddio2 pin which is powered from 1.8V. I am able to program chip but when I try to debug it I get output

Remote debugging using 127.0.0.1:2009

0x1fffcc28 in ?? ()

tbreak main

Temporary breakpoint 1 at 0x8001e06: file C:\...\main.c, line 117.

continue

Continuing.

in console instead of proper one:

Remote debugging using 127.0.0.1:2009

Reset_Handler () at C:\...\startup_stm32f0xx.s:74

74    movs r1, #0

tbreak main

Temporary breakpoint 1 at 0x8001e06: file C:\...\main.c, line 117.

continue

Continuing.

Temporary breakpoint 1, main () at C:\...\main.c:117

117      StateFunc stan = Device_PoweringOn;

As for mb1076 board I moved resistor R26 to place R15 to check if lower voltage on AIN1 will change anything. It did not help.

Do you have any ideas?

[WMa�? · Accepted solution]

After doing some research and inspection of my board project I doscovered that BOOT0 pin was not connected to GND. Pulling it to the ground with a resistor solved problem. Now debugging is working.