STM32 does not boot without JTAG

Kuikui · ‎2011-01-25

Posted on January 26, 2011 at 07:57

Kuikui · ‎2011-05-17

Posted on May 17, 2011 at 14:23

Well, I got it ...

After downloading firmware into STM32 via JTAG, if I put off the JTAG cable, the board doesn't start. And a reset through the NRST pin does not reset ... Then, MCU is freezed.

I have to completly turn-off and on the power in order to reset the board, and then the NRST pin can reset the MCU.

Why can't we just reset the MCU through NRST pin after programming the target through JTAG ?

Thanks for help.

Best regards,

V.

hanser · ‎2011-05-17

Posted on May 17, 2011 at 14:23

Probably the same as the reason why two successive program actions are sometimes not possible...

But I think if you boot with Boot0=+3.3V and then NRST=0V, it will probably work better.