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printf data abort - (again)

Hello,

I've problems with the printf() routine. I receive frames over the ethernet in a very short intervall. If I received a frame I set a flag in the ISR.

void ethernet_interrupt(void) __irq
{
        unsigned int status;
        AT91PS_EMAC pEmac = AT91C_BASE_EMAC;

        status = pEmac->EMAC_ISR;

        if (status & AT91C_EMAC_RCOM)                               /* Receive complete */
                Emac_Receive++;

        // clear receive status register
        pEmac->EMAC_RSR  &= ~(AT91C_EMAC_OVR | AT91C_EMAC_REC | AT91C_EMAC_BNA);
        AT91C_BASE_AIC->AIC_EOICR = 0;                               /* End of ISR */

}

In the main routine I ask if the flag is set -> if it is set, I use printf() to see via the usart that I get a new frame...

printf("h");

The problem is that I always get a data abort within the printf() routine..

Could it be that the ethernet frames came to close together (in a short time) so that the printf() routine has not finish to transmit the last character?

And after the ISR the printf() routine don't know what to do / what to send -> data abort??

If the printf-argument is much bigger - it is often so that I only can transmit one or two letter - but not the whole word...

e.g.

printf("hello world\n");

I only transmit "hel" - that's all...

best regards
Johannes

Parents
  • now I wrote:

    int COM1_1_sendchar(int ch)
    {
            unsigned int i=0;
    
            if (ch == '\n')  {                              /* Check for CR */
            while (!(COM1_1->US_CSR & AT91C_US_TXRDY));      /* Wait for Empty Tx Buffer */
            COM1_1->US_THR = '\r';
    
            if (COM1_1 != AT91C_BASE_US1) {
                    i++;
    }
    
            }
            while (!(COM1_1->US_CSR & AT91C_US_TXRDY));      /* Wait for Empty Tx Buffer */
            return (COM1_1->US_THR = ch);                        /* Transmit Character */
    }
    

    But the if-statement is never true - so I still have a data abort but the breakpoint (i++) was never reached.

    Johannes

Reply
  • now I wrote:

    int COM1_1_sendchar(int ch)
    {
            unsigned int i=0;
    
            if (ch == '\n')  {                              /* Check for CR */
            while (!(COM1_1->US_CSR & AT91C_US_TXRDY));      /* Wait for Empty Tx Buffer */
            COM1_1->US_THR = '\r';
    
            if (COM1_1 != AT91C_BASE_US1) {
                    i++;
    }
    
            }
            while (!(COM1_1->US_CSR & AT91C_US_TXRDY));      /* Wait for Empty Tx Buffer */
            return (COM1_1->US_THR = ch);                        /* Transmit Character */
    }
    

    But the if-statement is never true - so I still have a data abort but the breakpoint (i++) was never reached.

    Johannes

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