mirror of https://gitlab.com/camelot/kickc.git
318 lines
6.6 KiB
NASM
318 lines
6.6 KiB
NASM
/// @file
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/// A lightweight library for printing on the C64.
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///
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/// Printing with this library is done by calling print_ function for each element
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// Commodore 64 PRG executable file
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.file [name="sinus-basic.prg", type="prg", segments="Program"]
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.segmentdef Program [segments="Basic, Code, Data"]
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.segmentdef Basic [start=$0801]
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.segmentdef Code [start=$80d]
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.segmentdef Data [startAfter="Code"]
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.segment Basic
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:BasicUpstart(main)
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// Zeropage addresses used to hold lo/hi-bytes of addresses of float numbers in MEM
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.label memLo = $fe
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.label memHi = $ff
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.label print_screen = $400
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.label print_line_cursor = 2
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.label print_char_cursor = 4
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.segment Code
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main: {
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.label f_2pi = $e2e5
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.label i = 8
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// setFAC(1275)
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lda #<$4fb
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sta.z setFAC.prepareMEM1_mem
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lda #>$4fb
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sta.z setFAC.prepareMEM1_mem+1
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jsr setFAC
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// divFACby10()
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jsr divFACby10
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// setMEMtoFAC(f_127)
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lda #<f_127
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sta.z setMEMtoFAC.mem
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lda #>f_127
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sta.z setMEMtoFAC.mem+1
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jsr setMEMtoFAC
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lda #<print_screen
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sta.z print_line_cursor
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lda #>print_screen
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sta.z print_line_cursor+1
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lda #<print_screen
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sta.z print_char_cursor
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lda #>print_screen
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sta.z print_char_cursor+1
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lda #1
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sta.z i
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__b1:
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// setFAC((word)i)
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lda.z i
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sta.z setFAC.w
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lda #0
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sta.z setFAC.w+1
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jsr setFAC
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// mulFACbyMEM(f_2pi)
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lda #<f_2pi
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sta.z mulFACbyMEM.mem
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lda #>f_2pi
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sta.z mulFACbyMEM.mem+1
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jsr mulFACbyMEM
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// setMEMtoFAC(f_i)
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lda #<f_i
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sta.z setMEMtoFAC.mem
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lda #>f_i
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sta.z setMEMtoFAC.mem+1
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jsr setMEMtoFAC
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// setFAC(25)
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lda #<$19
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sta.z setFAC.prepareMEM1_mem
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lda #>$19
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sta.z setFAC.prepareMEM1_mem+1
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jsr setFAC
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// divMEMbyFAC(f_i)
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jsr divMEMbyFAC
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// sinFAC()
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jsr sinFAC
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// mulFACbyMEM(f_127)
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lda #<f_127
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sta.z mulFACbyMEM.mem
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lda #>f_127
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sta.z mulFACbyMEM.mem+1
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jsr mulFACbyMEM
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// addMEMtoFAC(f_127)
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jsr addMEMtoFAC
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// getFAC()
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jsr getFAC
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// print_uint(getFAC())
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jsr print_uint
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// print_ln()
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jsr print_ln
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// for(byte i : 1..25)
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inc.z i
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lda #$1a
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cmp.z i
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bne __b15
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// }
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rts
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__b15:
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lda.z print_line_cursor
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sta.z print_char_cursor
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lda.z print_line_cursor+1
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sta.z print_char_cursor+1
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jmp __b1
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.segment Data
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f_i: .byte 0, 0, 0, 0, 0
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f_127: .byte 0, 0, 0, 0, 0
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}
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.segment Code
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// FAC = unsigned int
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// Set the FAC (floating point accumulator) to the integer value of a 16bit unsigned int
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// void setFAC(__zp(6) unsigned int w)
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setFAC: {
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.label prepareMEM1_mem = 6
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.label w = 6
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// BYTE0(mem)
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lda.z prepareMEM1_mem
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// *memLo = BYTE0(mem)
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sta.z memLo
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// BYTE1(mem)
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lda.z prepareMEM1_mem+1
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// *memHi = BYTE1(mem)
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sta.z memHi
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// asm
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// Load unsigned int register Y,A into FAC (floating point accumulator)
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ldy memLo
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jsr $b391
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// }
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rts
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}
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// FAC = FAC/10
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// Set FAC to FAC divided by 10
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divFACby10: {
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// asm
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jsr $bafe
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// }
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rts
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}
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// MEM = FAC
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// Stores the value of the FAC to memory
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// Stores 5 chars (means it is necessary to allocate 5 chars to avoid clobbering other data using eg. char[] mem = {0, 0, 0, 0, 0};)
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// void setMEMtoFAC(__zp(6) char *mem)
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setMEMtoFAC: {
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.label mem = 6
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// BYTE0(mem)
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lda.z mem
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// *memLo = BYTE0(mem)
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sta.z memLo
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// BYTE1(mem)
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lda.z mem+1
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// *memHi = BYTE1(mem)
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sta.z memHi
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// asm
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ldx memLo
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tay
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jsr $bbd4
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// }
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rts
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}
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// FAC = MEM*FAC
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// Set FAC to MEM (float saved in memory) multiplied by FAC (float accumulator)
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// Reads 5 chars from memory
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// void mulFACbyMEM(__zp(6) char *mem)
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mulFACbyMEM: {
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.label mem = 6
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// BYTE0(mem)
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lda.z mem
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// *memLo = BYTE0(mem)
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sta.z memLo
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// BYTE1(mem)
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lda.z mem+1
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// *memHi = BYTE1(mem)
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sta.z memHi
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// asm
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lda memLo
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ldy memHi
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jsr $ba28
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// }
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rts
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}
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// FAC = MEM/FAC
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// Set FAC to MEM (float saved in memory) divided by FAC (float accumulator)
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// Reads 5 chars from memory
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// void divMEMbyFAC(char *mem)
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divMEMbyFAC: {
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.const prepareMEM1_mem = main.f_i
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// *memLo = BYTE0(mem)
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lda #<prepareMEM1_mem
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sta.z memLo
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// *memHi = BYTE1(mem)
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lda #>prepareMEM1_mem
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sta.z memHi
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// asm
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lda memLo
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ldy memHi
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jsr $bb0f
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// }
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rts
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}
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// FAC = sin(FAC)
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// Set FAC to sine of the FAC - sin(FAC)
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// Sine is calculated on radians (0-2*PI)
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sinFAC: {
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// asm
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jsr $e26b
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// }
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rts
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}
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// FAC = MEM+FAC
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// Set FAC to MEM (float saved in memory) plus FAC (float accumulator)
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// Reads 5 chars from memory
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// void addMEMtoFAC(char *mem)
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addMEMtoFAC: {
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.const prepareMEM1_mem = main.f_127
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// *memLo = BYTE0(mem)
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lda #<prepareMEM1_mem
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sta.z memLo
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// *memHi = BYTE1(mem)
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lda #>prepareMEM1_mem
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sta.z memHi
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// asm
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lda memLo
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ldy memHi
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jsr $b867
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// }
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rts
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}
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// unsigned int = FAC
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// Get the value of the FAC (floating point accumulator) as an integer 16bit unsigned int
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// Destroys the value in the FAC in the process
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getFAC: {
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.label return = 6
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// asm
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// Load FAC (floating point accumulator) integer part into unsigned int register Y,A
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jsr $b1aa
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sty memLo
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sta memHi
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// unsigned int w = MAKEWORD( *memHi, *memLo )
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sta.z return+1
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tya
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sta.z return
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// }
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rts
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}
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// Print a unsigned int as HEX
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// void print_uint(__zp(6) unsigned int w)
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print_uint: {
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.label w = 6
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// print_uchar(BYTE1(w))
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ldx.z w+1
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jsr print_uchar
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// print_uchar(BYTE0(w))
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ldx.z w
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jsr print_uchar
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// }
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rts
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}
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// Print a newline
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print_ln: {
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__b1:
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// print_line_cursor + 0x28
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lda #$28
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clc
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adc.z print_line_cursor
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sta.z print_line_cursor
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bcc !+
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inc.z print_line_cursor+1
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!:
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// while (print_line_cursor<print_char_cursor)
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lda.z print_line_cursor+1
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cmp.z print_char_cursor+1
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bcc __b1
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bne !+
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lda.z print_line_cursor
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cmp.z print_char_cursor
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bcc __b1
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!:
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// }
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rts
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}
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// Print a char as HEX
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// void print_uchar(__register(X) char b)
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print_uchar: {
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// b>>4
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txa
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lsr
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lsr
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lsr
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lsr
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// print_char(print_hextab[b>>4])
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tay
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lda print_hextab,y
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// Table of hexadecimal digits
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jsr print_char
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// b&0xf
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lda #$f
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axs #0
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// print_char(print_hextab[b&0xf])
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lda print_hextab,x
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jsr print_char
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// }
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rts
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}
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// Print a single char
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// void print_char(__register(A) char ch)
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print_char: {
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// *(print_char_cursor++) = ch
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ldy #0
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sta (print_char_cursor),y
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// *(print_char_cursor++) = ch;
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inc.z print_char_cursor
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bne !+
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inc.z print_char_cursor+1
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!:
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// }
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rts
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}
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.segment Data
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print_hextab: .text "0123456789abcdef"
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