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NULL is fine for reading the video output registers, since we don't care what comes back out

This commit is contained in:
Daniel Loffgren 2017-03-21 22:02:04 -07:00
parent a76501bf47
commit b54068488e
1 changed files with 2 additions and 3 deletions
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5
src/pia.c
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@ -13,7 +13,6 @@
#include <unistd.h>
#include <assert.h>
#define FIXME_I_SHOULDNT_BE_NULL NULL
#define KEYBOARD_READY 0xFF // This just needs to meet the requirements of being a negative number in the eyes of the 6502
#define KEYBOARD_NOTREADY 0x00
#define ANSI_BGCOLOR_GREEN "\x1b[42;1m"
@ -205,8 +204,8 @@ a1pia *pia_create(v6502_cpu *cpu) {
assert(v6502_map(cpu->memory, A1PIA_KEYBOARD_INPUT_REGISTER, 1, (v6502_readFunction *)keyboardReadCharacterCallback, NULL, pia));
assert(v6502_map(cpu->memory, A1PIA_KEYBOARD_READY_REGISTER, 1, (v6502_readFunction *)keyboardReadReadyCallback, NULL, pia));
assert(v6502_map(cpu->memory, A1PIA_VIDEO_OUTPUT_REGISTER, 1, FIXME_I_SHOULDNT_BE_NULL, (v6502_writeFunction *)videoWriteCharCallback, pia));
assert(v6502_map(cpu->memory, A1PIA_VIDEO_ATTR_REGISTER, 1, FIXME_I_SHOULDNT_BE_NULL, (v6502_writeFunction *)videoWriteNewlineCallback, pia));
assert(v6502_map(cpu->memory, A1PIA_VIDEO_OUTPUT_REGISTER, 1, NULL, (v6502_writeFunction *)videoWriteCharCallback, pia));
assert(v6502_map(cpu->memory, A1PIA_VIDEO_ATTR_REGISTER, 1, NULL, (v6502_writeFunction *)videoWriteNewlineCallback, pia));
return pia;
}