[Simulavr-devel] Re: follow up on return from interrupt

[Keith Gudger]

Ted:

I checked it out, and it works as advertised.  I can't say for sure that
it doesn't break something else, but it should not.

Do you have any ideas about my previous problem of why I get an I/O read
before simulavr even gets attached?  Here's the output:

./simulavr -g -d atmega128

Simulating a atmega128 device.

MESSAGE: file decoder.c: line 3517: generating opcode lookup_table

Enter 9 bits of hex data to read into the uart at address 0x002c:


This happens before the gdb client has done "target remote :1212".  It
only happens with the UART in I/O space - the UART1 in RAM space does not
get its read routine called.
 
The 'C' code that is getting called:

static uint8_t uart_read( VDevice *dev, int addr )
{
    UART_T *uart = (UART_T *)dev;
    UARTIntr_T *uart_t;
    int  offset  = addr - vdev_get_base(dev);

    uart_t = (UARTIntr_T *)avr_core_get_vdev_by_name( 
                             (AvrCore *)vdev_get_core((VDevice *)uart),
                               uart->int_name );

    if ( offset == UART_UDR_ADDR )
    {
        uart_t->usr &= ~mask_RXC ; /* clear RXC bit in USR */
        return uart->udr_rx = uart_port_rd( addr );
    }
...

Any ideas as to why this gets called when the vdev gets instantiated?
Thanks.

Keith


On Tue, 2 Dec 2003, Theodore A. Roth wrote:

> Keith,
> 
> Did you get a chance to see if this patch works?
> 
> Ted Roth