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[Concerto] Interrupt Priorities (NVIC)

Hello!

We have difficulties setting priority for an UART interrupt. Here is the code:

IntEnable(INT_UART3); 
UARTIntEnable(UART3_BASE, UART_INT_RX | UART_INT_TX); 
IntRegister(INT_UART3, USART1_IRQHandler); 
IntPrioritySet(INT_UART3, 0xC0); 

The last function has no effect at all - peripheral register are not changed after this func is executed.
But with others interrupts (timers) this works properly. What's wrong?