bin_to_bcd can be called from C

Remove old cash window formatting code (we'll be rewriting it in C)
This commit is contained in:
jeffman 2018-12-06 23:05:00 -05:00
parent 6999957c7f
commit aa4191aec2
3 changed files with 6 additions and 76 deletions

View File

@ -2,3 +2,4 @@ typedef unsigned char byte;
void __attribute__((naked)) cpufastset(void *source, void *dest, int mode) {}
byte* __attribute__((naked)) m2_strlookup(int *offset_table, byte *strings, int index) {}
int __attribute__((naked)) bin_to_bcd(int value, int* digit_count) {}

View File

@ -76,3 +76,4 @@ extern byte m12_other_str8[];
extern void cpufastset(void *source, void *dest, int mode);
extern byte* m2_strlookup(int *offset_table, byte *strings, int index);
extern int bin_to_bcd(int value, int* digit_count);

View File

@ -3,14 +3,14 @@
// int bin_to_bcd(int binary)
// In:
// r0: binary number
// r1: out pointer; amount of digits used will be returned here
// Out:
// r0: BCD-coded number
// r1: amount of digits used
//==============================================================================
bin_to_bcd:
push {r2-r7,lr}
push {r1-r7,lr}
mov r2,r8
mov r3,r9
push {r2-r3}
@ -120,6 +120,8 @@ mov r1,r3
pop {r2-r3}
mov r8,r2
mov r9,r3
pop {r2}
str r1,[r2]
pop {r2-r7,pc}
@ -196,77 +198,3 @@ add r1,r1,r4
//--------------------------------
mov r0,r1
pop {r1-r4,pc}
//==============================================================================
// ushort format_cash(int amount, char* output, int digits)
// In:
// r0: amount
// r1: output string
// r2: digits
// Out:
// r0: = digits - (digits rendered) - 1
//==============================================================================
format_cash:
push {r1-r7,lr}
mov r4,r1
mov r6,r2
//--------------------------------
// Figure out how many digits we need
bl bin_to_bcd
mov r5,r1
mov r7,r1
// The window is 56 pixels wide:
// each digit uses 6 pixels, the 0x sign uses 6, and the
// double-zero uses 8
mov r2,42 // = 56 - 6 - 8
lsl r3,r1,2
add r3,r3,r1
add r1,r1,r3 // r1 *= 6
sub r1,r2,r1 // r1 = 42 - r1
// Store the control code to the output
mov r2,0x5F
strb r2,[r4,0]
mov r2,0xFF
strb r2,[r4,1]
strb r1,[r4,2]
// Store the dollar sign
mov r2,0x54
strb r2,[r4,3]
add r4,r4,4
// Store the digits to the output
mov r2,8
sub r2,r2,r5
lsl r2,r2,2
lsl r0,r2 // Now the number is pushed to the left of the register
@@prev:
lsr r1,r0,28 // Get the left-most digit
add r1,0x60 // Integer-to-char
strb r1,[r4,0]
add r4,r4,1
lsl r0,r0,4
sub r5,r5,1
bne @@prev
// Store the double-zero sign
mov r1,0x56
strb r1,[r4,0]
// Store the end code
mov r1,0
strb r1,[r4,1]
mov r1,0xFF
strb r1,[r4,2]
//--------------------------------
sub r5,r6,r7
sub r0,r5,1
pop {r1-r7,pc}