2020-02-05 11:34 AM
Hi.
i was working on a custom f407ZEx board along with ssd1963 but after some repeatitive plug-on and plug-off the stlink (v2) and ssd1963 died. i changed both of them but after that the mcu can't be reprogrammed. in keil "internal command error" and in stm32 st-link utility "can not connect target".
i tried changing framework and rest mode but no use!
can anyone help me?
thanks.
2020-02-05 11:49 AM
The external ST-LINK/V2 needs pin 1 or 2 provided with Target VCC
If the STM32 is non-functional and non-communicative, then you'll get these kind of failures.
Check the NRST level.
Check the voltages/capacitors on the VCAP pins.
See if you can connect with BOOT0 pulled High.
Check signs of life via the System Loader and USART1 or USART3, see App Note AN2606