c - Usart interrupt registeration -


i using at32uc series (custom board) application , usart rs485 interrupts killing me today. have rx interrupt set , working. trying add tx interrupt called if data available send. problem tx interrupt never called. after few hours fighting i've found strange. 

int main() .....// other initialisations intc_init_interrupts(); intc_register_interrupt(&timerinterrupt, avr32_tc_irq0, avr32_intc_int0); intc_register_interrupt(&rs485txinterrupt, avr32_usart2_irq, avr32_intc_int1); intc_register_interrupt(&rs485rxinterrupt, avr32_usart2_irq, avr32_intc_int0);               enable_global_interrupt();

from above, rx interrupt working , if change order of intc rx interrupt tx interrupt, tx interrupt working , no rx interrupt. function calling each interrupts in main. can explain wrong understanding in implementing interrupts. i've attached snippets of relevant codes further reference. 

static void sendtx(void) {        txlength = 5;     gpio_set_pin_high(avr32_pin_pa10);     txbuf[0] = ateaddress;     avr32_usart2.thr.txchr = txbuf[0];     tx_outctr = 1;      if(peaksrdy_flag == true)     {         txbuf[1] = peaks[loop][0];           txempty_flag = false;         avr32_usart2.ier = avr32_usart_ier_txrdy_mask;     } } __attribute__((__interrupt__)) static void rs485txinterrupt(void) {        //avr32_usart2.idr.txrdy = 1;     avr32_usart2.thr.txchr = txbuf[1];     avr32_usart2.cr.sttbrk = 1;     gpio_set_pin_low(avr32_pin_pa10);     gpio_set_pin_low(avr32_pin_pa06);     if(!txempty_flag)     {           //gpio_set_pin_high(avr32_pin_pa06);         //avr32_usart2.imr.txrdy;     } }  static void readrx(void) {    avr32_usart2.cr.txdis = 1; avr32_usart2.ier = avr32_usart_ier_rxrdy_mask; }  __attribute__((__interrupt__)) static void rs485rxinterrupt(void) {  //avr32_usart2.idr.rxrdy = 1; uint32_t data; static char rxdatalength = 98; data = avr32_usart2.rhr.rxchr;      if(data & 0x00000100)     {         if((data & 0x000000ff) == 0x92) //dsp board address = 0x92         {              rxbuf[0] = data;             addr_flag = true;             rxinctr = 1;         }         else         {             addr_flag = false;             return;         }      }       else if (addr_flag == true)      {          rxbuf[rxinctr++] = data;          if(rxinctr == 2)           // command check          {             if(data < 0x80)             {                    addr_flag = false;  // reset addr flag                 if(data==0x10)//start                 {                      start_flag = true;                  }                 else if(data == 0x11) //cancel                 {                     gpio_set_pin_high(avr32_pin_pa13);                     break_flag = true;                 }             }             else if(data >= 0x80)                  rxdatalength = 3;         }           if ((rxinctr == rxdatalength) || ((rxdatalength == 98) && (rxinctr == rxbuf[2]+1)))          {             //gpio_set_pin_high (avr32_pin_pa16);             addr_flag = false;             start_flag = true;          }      } gpio_set_pin_low(avr32_pin_pa13); }

thanks in advance!

you registering 2 different routines same interrupt (avr32_usart2_irq), second registration overwrites first one.

notice there's one irq/isr both rx , tx in at32uc , you'll have determine 1 occurred in isr, see e.g. http://www.avrfreaks.net/forum/how-distinguish-usart-interrupts-txrdy-rxrdy.


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