RE: [avr-gcc-list] help -- ATMEGA48 uart recv interrupt

[Trampas]

Use signal instead of interrupt. I find using the Interrupt will cause the
ISR to be called twice and lock up as you mentioned. 

Regards,
Trampas Stern 
 


-----Original Message-----
From: address@hidden
[mailto:address@hidden On Behalf Of Xing
Yu
Sent: Thursday, July 14, 2005 3:45 PM
To: address@hidden
Subject: [avr-gcc-list] help -- ATMEGA48 uart recv interrupt

Dear all,

I am having a problem with the ATMEGA48's uart receive
interrupt.  In the program, I enabled both uart
receive and transmit interrupts.  The transmit
interrupt seems doing ok -- it sends out characters
continuously; the receive interrupt doesn't work --
whenever the ATMEGA48 receives a character the
processor hangs.  

Here's the ISRs used in my program --

/* UART receive interrupt handlers */
void SIG_USART_RECV (void) __attribute__
((interrupt));  
void SIG_USART_RECV (void)

{
        
//      if(UART_RxCount < UART_RxLen)
                UART_RxBuf[UART_RxCount++] = UDR0;
                
//      app_regs[LED_STATUS_REG] = UART_RxCount;

        
}


void SIG_USART_TRANS (void) __attribute__
((interrupt));  
void SIG_USART_TRANS (void)
{
        if(UART_TxCount < UART_TxLen)
                UDR0 = UART_TxBuf[UART_TxCount++];
}

I've checked the map file -- the __vector_18 (UART
receive) and __vector_20 (UART_transmit) are there, so
I assume the compiler didn't ignore my ISRs.

UART reception using polling method is OK, but it is
bad for my state-machine :(...

I wonder if anyone has made the ATMEGA48 uart receive
interrupt working and could kindly help me on this
issue.  I am using the lasest winavr 20050214 version.

Many thanks,

Xing Yu


        
        
                
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