interrupt handling for UART

[Altera_Forum]

hello everyone. 

 I am trying to send and receive data between UART on UP3 and hyperterminal. But am not able to set the interrupts properly and as a result my program goes in an infinite loop. here is a part of my code....could u plz tell me what else needs to be added to the code so that an interrupt is generated when some data comes on the serial port..  int main(void) {  int led = 0x01;  int ch = 0;  FILE *fd;  /* Initialise the interrupt controller. */   alt_irq_init (ALT_IRQ_BASE);     IOWR_ALTERA_AVALON_PIO_DATA(LED_PIO_BASE,led); // write initial value to pio  /* initialise the device drivers/software components*/  alt_sys_init();   # ifdef UART_BASE  fd = fopen("/dev/uart", "r+");  # endif   if(fd){  while(1){  if(FLAG_READ){ /* it is set inside the alt_avalon_uart_rxirq() function when some data is received */    alt_avalon_uart_read(fd,ch,sizeof(int));  break;   } // end of if    } // end of while  } // end of if    if(ch == 'a')  led = 0x02;   else   led = 0x04;   IOWR_ALTERA_AVALON_PIO_DATA(LED_PIO_BASE,led); // write new value to pio     fclose(fd); }  whenever i run this code it doesnt come out of the while loop even when i type something on the hyperterminal. Plz helo me out thnx  sourabh goel

[Altera_Forum]

--- Quote Start ---  originally posted by sourabhgoel83@Sep 9 2005, 07:41 PM hello everyone.  i am trying to send and receive data between uart on up3 and hyperterminal. but am not able to set the interrupts properly and as a result my program goes in an infinite loop. here is a part of my code....could u plz tell me what else needs to be added to the code so that an interrupt is generated when some data comes on the serial port..  int main(void) {   int led = 0x01;   int ch = 0;   file *fd;   /* initialise the interrupt controller. */       alt_irq_init (alt_irq_base);        iowr_altera_avalon_pio_data(led_pio_base,led); // write initial value to pio  /* initialise the device drivers/software components*/   alt_sys_init();   # ifdef uart_base     fd = fopen("/dev/uart", "r+");  # endif   if(fd){   while(1){   if(flag_read){          /* it is set inside the alt_avalon_uart_rxirq() function when some data is received */                  alt_avalon_uart_read(fd,ch,sizeof(int));         break;                             }  // end of if                }  // end of while   }    //  end of if     if(ch == &#39;a&#39;)       led = 0x02;      else        led = 0x04;      iowr_altera_avalon_pio_data(led_pio_base,led);  // write new value to pio            fclose(fd); }  whenever i run this code it doesnt come out of the while loop even when i type something on the hyperterminal. plz helo me out thnx  sourabh goel <div align='right'><{post_snapback}> (index.php?act=findpost&pid=9658)  --- quote end ---    --- Quote End ---    Hi sourabh goel,  Why don&#39;t you try an284 on www.altera.com ?  Note : This application note was written for NIOS system. If you are using NIOSII , you would have to convert some of the functions to be NIOSII-compatible.  You can reference to an350 to do it.  Good luck,  Quan

[Altera_Forum]

Is there a reason you&#39;re not using the HAL provided routines? Even if they&#39;re not exactly what you need, at least you can test the initial functionality...and they might provide a decent starting point for your own code. 

 See the Software User&#39;s Guide in the documents directory for more info.  Cheers,  - slacker

[Altera_Forum]

See discussions 

http://forum.niosforum.com/forum/index.php?showtopic=3749 (http://forum.niosforum.com/forum/index.php?showtopic=3749) http://forum.niosforum.com/forum/index.php?showtopic=4609 (http://forum.niosforum.com/forum/index.php?showtopic=4609) http://forum.niosforum.com/forum/index.php?showtopic=477 (http://forum.niosforum.com/forum/index.php?showtopic=477)   http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/rolleyes.gif

[Altera_Forum]

Hey all, 

 Here is some working code for an UART RX interrupt:  A interrupt function which takes the data from the serial port (and put it into for example in a char array)   void UartReceiver1(void * content,alt_u32 id) {   // get the uart data  unsigned char * UartData = (unsigned char*)(UART1_BASE);   // UART1_BASE is defined in system.h   } }  Setting up the interrupt:   // UART1 interrupt routine declaration   alt_irq_register(UART1_IRQ,NULL,UartReceiver1);  IOWR_ALTERA_AVALON_UART_CONTROL(UART1_BASE, 0x80);  Kind regards  Karel