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External interrupt not working while UART interrupt running

Question asked by gowri.karthi on Apr 23, 2015
hi all ,
     i want to check the interrupt performance of STM32f407ZG controller.but i don't know how can i calculate the interrupt i a activete three interrupts ,such as
 i)UART3 RX interrupt
ii)UART3 TX interrupt 
iii)external interrupt by using PB0
 UART interrupts are working fine .but unfortunately external interrupt is not working when i combine these three interrupts.i want solution to activate the external interrupt while performing uart interrupt. 
anybody give the suggession/solution pls.thanks in advance