5409 | 5416 | AD5 | ADC | BIOS | Boot | Booting | Bootloader | C540 | C5402 | C5409 | C5416 | CCS | Codec | DMA | Dmad | DSK | DSKPlus | Dsplib | EVM | FFT | FIR | Flash | GPIO | HPI | Initialization | Interrupt | JTAG | LOG_printf | MCBSP | RFFT | RTDX | Sampling | STLM | UART | VC540

Hey all,

I'm getting stuck somewhere in the GBL_init module of DSP/BIOS. I know I get past the part
where it calls the USERINITFXN because I am able to turn off leds up until my function calls
RET (it's an assembly function). However, when I put code in the BIOS_init function after it
calls GBL_init, my code never gets called. Here is the code from GBL_init including where it
calls my USERINITFXN function (from gbl.h54):

.if (GBL_USERINIT != 0)
	; USERINITFXN below is defined in GBL_config
	    ssbx cpl		; CPL = 1 for C convention
	    .if __far_mode
	      fcall :USERINITFXN:	; (*fxn)()
				; the 'fcall' instruction pushes a 2-word
				; return address on the stack; the SP will
				; be even on C function entry
	    .else
	      call :USERINITFXN:	; (*fxn)()
				; the 'call' instruction pushes a one word
				; return address on the stack; the SP will
				; be odd on C function entry
	    .endif
	    rsbx cpl		; make CPL = 0 for BIOS environment 
	.endif

	;
	;  Calling TRC_init from here until there is at trc.cdb file.
	;
	TRC_init

	;
	;  fill memory using triples (nwords, addr, value) from
	;  gblinit table.
	;

	ld 	#0, b
	.if __far_mode
	    ldx #gblinit, 16, a		; a = far gblinit address
	    or 	#gblinit, a, a
	.else
	    rsbx sxm			; so 'ld #K,a' will not sign extend
	    nop
	    ld  #gblinit, a		; a = gblinit address
	.endif

loop0?:	
	reada	*(bl)			; b = nwords
	bc	done?, beq
	add	#1, a	
	nop
	reada	*(ar2)			; ar2 = address
	add	#1, a	
	nop
	reada	*(ar3)			; ar3 = value
	add	#1, a	
	nop
loop1?:	
	mvkd	#ar3, *ar2+
	sub	#1, b
	bc	loop1?, bgt

	b	loop0?
done?:

	ld #1, b
	.if __far_mode
	    ldx #GBL_initdone, 16, a
	    or  #GBL_initdone, a, a
	.else
	    rsbx sxm
	    nop
	    ld #GBL_initdone, a
	.endif
	writa *(bl)

	.endm

Any ideas on what could be snagging here?

Thanks,
Jess Howe

(You need to be a member of c54x -- send a blank email to c54x-subscribe@yahoogroups.com )

Jess-

> I'm getting stuck somewhere in the GBL_init module of DSP/BIOS. I know I get past the part
where it calls the USERINITFXN because I am able to turn off leds up until my function calls
RET (it's an assembly function). However, when I put code in the BIOS_init function after it
calls GBL_init, my code never gets called. Here is the code from GBL_init including where it
calls my USERINITFXN function (from gbl.h54):

Where is the RET statement that you mention?  Don't you need something like:

   .if __far_mode
       fret
   .else
       ret
   .endif

Also, I hope you're right about DSP/BIOS using CPL set to 1.  If it were me, I'd
*save* the state of the CPL bit before changing to C convention, then restore it to
whatever DSP/BIOS wanted it to be.
 
-Jeff

> .if (GBL_USERINIT != 0)
>         ; USERINITFXN below is defined in GBL_config
>             ssbx cpl            ; CPL = 1 for C convention
>             .if __far_mode
>               fcall :USERINITFXN:       ; (*fxn)()
>                                 ; the 'fcall' instruction pushes a 2-word
>                                 ; return address on the stack; the SP will
>                                 ; be even on C function entry
>             .else
>               call :USERINITFXN:        ; (*fxn)()
>                                 ; the 'call' instruction pushes a one word
>                                 ; return address on the stack; the SP will
>                                 ; be odd on C function entry
>             .endif
>             rsbx cpl            ; make CPL = 0 for BIOS environment
>         .endif
> 
>         ;
>         ;  Calling TRC_init from here until there is at trc.cdb file.
>         ;
>         TRC_init
> 
>         ;
>         ;  fill memory using triples (nwords, addr, value) from
>         ;  gblinit table.
>         ;
> 
>         ld      #0, b
>         .if __far_mode
>             ldx #gblinit, 16, a         ; a = far gblinit address
>             or  #gblinit, a, a
>         .else
>             rsbx sxm                    ; so 'ld #K,a' will not sign extend
>             nop
>             ld  #gblinit, a             ; a = gblinit address
>         .endif
> 
> loop0?:
>         reada   *(bl)                   ; b = nwords
>         bc      done?, beq
>         add     #1, a
>         nop
>         reada   *(ar2)                  ; ar2 = address
>         add     #1, a
>         nop
>         reada   *(ar3)                  ; ar3 = value
>         add     #1, a
>         nop
> loop1?:
>         mvkd    #ar3, *ar2+
>         sub     #1, b
>         bc      loop1?, bgt
> 
>         b       loop0?
> done?:
> 
>         ld #1, b
>         .if __far_mode
>             ldx #GBL_initdone, 16, a
>             or  #GBL_initdone, a, a
>         .else
>             rsbx sxm
>             nop
>             ld #GBL_initdone, a
>         .endif
>         writa *(bl)
> 
>         .endm
> 
> Any ideas on what could be snagging here?
> 
> Thanks,
> Jess Howe

(You need to be a member of c54x -- send a blank email to c54x-subscribe@yahoogroups.com )