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View code
Binary to BCD unpacked 17 bit to 5 full digits
Author: Mike Mansheim of Graco, Inc.
This code was originally located @ http://www.piclist.com
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unsigned int TenK, Thou, Hund, Tens, Ones;
unsigned int num[3];
void BIN2DEC(void)
{
// operates on global variables:
// set num[0]-[3] (lo-hi) before calling
// returns with TenK...Ones set from 0-9
unsigned int a0, a1, a2, a3, a4;
unsigned int t1, t2, t3; // scratchpad variables
// isolate the 4 bit nibbles
// for the purposes of this routine, a4 can be only 0 or 1
a4 = num[2];
a3 = num[1] / 16;
a2 = num[1] & 0b00001111;
a1 = num[0] / 16;
a0 = num[0] & 0b00001111;
// calculate the decimal digits (the b_i's are expressed here
// as TenK...Ones, as in the original)
// all are negative, except TenK
t1 = 4 * a4;
Ones = a0 - t1 - 20;
t2 = 2 * a1;
Tens = t1 + t2 - 198;
t3 = 2 * a2;
Hund = a3 + t3 - 140;
t3 = t3 * 2; // now = 4 * a2
t2 = t2 * 2; // now = 4 * a1
Ones = Ones - t3 - t2;
t3 = t3 + a2 + a2; // now = 6 * a2
Tens = Tens + t3; // Tens done
t1 = t1 + a4; // now = 5 * a4
Hund = Hund + t1;
t3 = 4 * a3;
Thou = t1 + t3 - 144; // Thou done
Ones = Ones - t3; // Ones done
TenK = t1 + a4 + 16; // Tenk done
// "normalize" the digits - this asm code was
// copied directly from the original
#asm
movlw 0x0A
Lb1:
addwf Ones,f
decf Tens,f
btfss 3,0
goto Lb1
Lb2:
addwf Tens,f
decf Hund,f
btfss 3,0
goto Lb2
Lb3:
addwf Hund,f
decf Thou,f
btfss 3,0
goto Lb3
Lb4:
addwf Thou,f
decf TenK,f
btfss 3,0
goto Lb4
#endasm
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