Packed decimal to 32bit via input routine by http://elm-chan.org
;-----------------------------------------------------------------------------; ; Get value of Packed BCD (32 bit) ; ; Register Variables: ; ; Call: X -> Packed BCD (big endian, right stored) ; len = Number of BCD digits ; var3:0 = <Don't care> ; tmp1:0 = <Don't care> (high register must be assigned) ; ; Result: var3:0 = 32 bit result ; ; Size: 28 words ; Clock: 687 * len + 3 cycles (+ret) ; Stack: 0 byte get_pbcd: clr var0 ;var = 0; clr var1 ; clr var2 ; clr var3 ;/ ;--- decimal digit loop clr tmp0 ;var1 *= 10; ldi tmp1, 33 ; brcc PC+2 ; subi tmp0,-10 ; lsr tmp0 ; ror var3 ; ror var2 ; ror var1 ; ror var0 ; dec tmp1 ; brne PC-8 ;/ ld tmp0, X+ ;Pick a decimal digit sbrc len, 0 ; rjmp PC+3 ; sbiw XL, 1 ; swap tmp0 ; andi tmp0, 0x0f ;/ add var0, tmp0 ;var += decimal digit; adc var1, tmp1 ; adc var2, tmp1 ; adc var3, tmp1 ;/ dec len ;while(--len != 0) brne PC-22 ;/ ret
file: /Techref/atmel/avr/packed2bin32b-ec.htm, 1KB, , updated: 2007/9/14 18:44, local time: 2024/8/14 21:18,
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