Lpc2000

Hello Guille,

Out of interest, what were the compiler switches used to get
your output below? (I have only started using GCC myself).

Dave


> > void Uart0Service(void) __attribute__ ((interrupt("IRQ"));
> > 
> > void Uart0Service(void)
> > {
> > 18f0:  e24ee004  sub    lr, lr, #4 ; 0x4
> > 18f4:  e92d500f  stmdb  sp!, {r0, r1, r2, r3, ip, lr}
> > unsigned char temp_id;
> > temp_id = U0IIR;
> >     18f8:  e3a03903   mov  r3, #49152   ; 0xc000
> >     18fc:  e283328e   add  r3, r3, #-536870904  ; 0xe0000008
> >     1900:  e5d32000   ldrb  r2, [r3]
> > switch(temp_id & IDENT_MASK) {
> >     1904:  e202200e   and  r2, r2, #14  ; 0xe
> > case DATA_AVAILABLE:
> > case DATA_TIMEOUT:
> > receive();
> > break;
> > case TRANSMIT_AVAILABLE:
> > transmit();
> > default:
> > break;
> > }
> >     /* case DATA_AVAILABLE */
> >     1908:  e3520004   cmp  r2, #4       ; 0x4
> >     190c:  0a000005   beq  1928 <Uart0Service+0x38>
> > 
> >     /* case DATA_TIMEOUT */
> >     1910:  e352000c   cmp  r2, #12      ; 0xc
> >     1914:  0a000003   beq  1928 <Uart0Service+0x38>
> > 
> >     /* case [not] TRANSMIT_AVAILABLE */
> >     1918:  e3520002   cmp  r2, #2       ; 0x2
> >     191c:  18fd900f   ldmneia  sp!, {r0, r1, r2, r3, ip, pc}^
> > 
> >     1920:  ebfffa69   bl  2cc <transmit>
> >     1924:  e8fd900f   ldmia  sp!, {r0, r1, r2, r3, ip, pc}^
> > 
> >     1928:  ebfffa75   bl  304 <receive>
> >     192c:  e8fd900f   ldmia  sp!, {r0, r1, r2, r3, ip, pc}^
> > }
> > 
> > Shouldn't this code also save spsr? Or perhaps this is only needed 
> > for reentrant IRQs?
> > 
> > Guille
> >
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