[En-Nut-Discussion] bootloader, assembler source for flash programming

[Brett Abbott]

Hermann

This snippet of code replaces the assembly portion of the bootloader.  
unfortunately you will have to port the C bit yourself as I dont use 
that version.

Ive also cc'd the list as it is quite short.

    .module flash_ICC.s
    .dbfile flash_ICC.s
    .area text
   
    .even

;#define RAMPZ   0x3B
;#define SPMCR   0x68

; void SpmCommand(u_short addr, u_char function);
; SpmCommand(u_short pageAddress, u_char SPMEN_Bit)
; R16/R17 hold 1st value
; R18/T19 hold 2nd value.  Low byte is first byte.

_SpmCommand::
        movw    r30, r16        ; First argument is page address
        mov     r26, r18        ; Added for ICC (r26 is volatile and 
safe to change)
        rjmp    DoSpm

; void SpmBufferFill(u_short data, u_short adr);
; SpmBufferFill(u_short pageAddress, u_short pointerToData)
; R16/R17 hold 1st value
; R18/T19 hold 2nd value

_SpmBufferFill::
        movw    r30, r16        ; First argument is page address 
        movw    r0, r18         ; Second argument is data pointer
        ldi     r26, 1          ; SPMEN bit - r26 is volatile and safe 
to use

;#define SPMCR   0x68

DoSpm:
        sts     0x68, r26      ; Store function in SPMCR - ICC use r26 
as it is volatile
        spm                     ; store program memory

WaitSpm:
;#define SPMCR   0x68

        lds     r26, 0x68      ; Loop until SPMEN in SPMCR is cleared - 
ICC use r26 as it is volatile
        sbrc    r26, 0         ; ICC r26 as it is volatile
        rjmp    WaitSpm

        ret

Cheers
Brett

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