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usart pin transmits junk values after couple of correct transmission

Question asked by das.sanjib on Feb 7, 2015
Latest reply on Feb 7, 2015 by Clive One
I have a piece of code of usart half duplex which was working fine with stm32f030 mounted on the pcb (designed as required for my project) for some time . I am giving external 5 volt supply as I am driving motor too. For controller I am regulating it to 3.3 volt . the command for motor moving send by another f030 controller through usart .
After sometime the Usart communication doesn't happen and it never happens again I  checked the Usart pin for checking what it is transmitting I found it gives some junk value(checked with docklight as well as scope) but it is working fine with the f030 evaluation board please help