RE: [avr-gcc-list] Overlong interrupt vector table

[Weddington, Eric]

> -----Original Message-----
> From: 
> address@hidden 
> [mailto:address@hidden
> org] On Behalf Of Richard F
> Sent: Tuesday, February 03, 2009 5:11 AM
> To: address@hidden
> Subject: [avr-gcc-list] Overlong interrupt vector table
> 
> I'm working on a small application in an ATMEGA48p, and need 
> a few extra bytes of code space.
> This may have been answered before, but I can't find a reference...
> Does anyone know why there are 40 vectors where Atmel specify 26 -
> What are the last 14 items (that look like vectors) used for, 
> and how can I make use of this "wasted space"?
> (Is it a general purpose vector table for the largest possible AVR?)
> Thx

The vector table code is located in the startup code in avr-libc.

 
> <scheduler+0x26>
>       36:    73 c2           rjmp    .+1254       ; 0x51e 
> <scheduler+0x2a>
>       38:    76 c2           rjmp    .+1260       ; 0x526 
> <scheduler+0x32>
>       3a:    7d c2           rjmp    .+1274       ; 0x536 
> <scheduler+0x42>
>       3c:    7f c2           rjmp    .+1278       ; 0x53c 
> <scheduler+0x48>
>       3e:    83 c2           rjmp    .+1286       ; 0x546 
> <scheduler+0x52>
>       40:    82 c2           rjmp    .+1284       ; 0x546 
> <scheduler+0x52>
>       42:    81 c2           rjmp    .+1282       ; 0x546 
> <scheduler+0x52>
>       44:    80 c2           rjmp    .+1280       ; 0x546 
> <scheduler+0x52>
>       46:    7f c2           rjmp    .+1278       ; 0x546 
> <scheduler+0x52>
>       48:    7e c2           rjmp    .+1276       ; 0x546 
> <scheduler+0x52>
>       4a:    7d c2           rjmp    .+1274       ; 0x546 
> <scheduler+0x52>
>       4c:    84 c2           rjmp    .+1288       ; 0x556 
> <scheduler+0x62>
>       4e:    83 c2           rjmp    .+1286       ; 0x556 
> <scheduler+0x62>

I have no idea where you are getting these <scheduler+xxxx> ids from. Perhaps 
you're using an RTOS? But they certainly don't come from the startup code in 
avr-libc.