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Altera_Forum's avatar
Altera_Forum
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16 years ago

Interrupt handling

Hello guys, I got problems with my interrupt routines. One routine is for uart whitch means if a character comes in it'll be stored in a buffer array, the other one is for simple timer ticks. ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

Hi Iftan, thank's for your reply.

My problem is very confuse. My ISR for the timer interrupt works perfect. I checked also the IPENDING register, if there is an incoming timer interrupt I can see 0x02 (for the timer interrupt flag), after that, the timer ISR enters.

But my uart ISR doesn't work. I use HyperTerminal for communication. I checked the hardware with a simple polling routine. Every time I press an key the routine returns the character to HyperTerminal. Works fine but is laborious. I dont't see the changing of the IPENDING register, either. Could it be, that a hardware or software part blocks the uart interrupt request ???