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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
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16 years ago

First, are you using your own UART driver or Altera provided UART driver?

If "reduced device driver" or "small driver" is enabled, it doesn't use the ISR routine altera_avalon_uart_irq(). Instead, it will use the polling mode. For example, when you try to read or write something to UART, it will block the program (while loop), until it can send or receive any data from UART.

You can try to read the source code for altera_avalon_uart_write() and altera_avalon_uart_read() routines under the# if defined(ALT_USE_SMALL_DRIVERS) || defined(ALTERA_AVALON_UART_SMALL). You can understand more.