radumaco/goboy
1
0
Fork 0
mirror of https://github.com/macocianradu/goboy.git synced 2026-03-18 21:10:07 +00:00
Code Issues Packages Projects Releases Wiki Activity

added half carry flags

Browse Source
This commit is contained in:
radumacocian
2025-06-30 14:34:58 +02:00
parent e323266814
commit 5f6ee58378
4 changed files with 57 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

23
cpu/functions.go
View File

@@ -6,8 +6,8 @@ import (
)
type op_context struct {
cpu CPU_struct
addr uint
cpu CPU_struct
immediate byte
}
func Noop(context op_context) {
@@ -16,8 +16,8 @@ func Noop(context op_context) {
// LDBCd16 Load the 2 bytes of immediate data into register pair BC.
func LDBCd16(context op_context) {
operations.LD(&context.cpu.C, memory.Read8(context.addr))
operations.LD(&context.cpu.B, memory.Read8(context.addr+8))
operations.LD(&context.cpu.C, memory.Read8(uint(context.immediate)))
operations.LD(&context.cpu.B, memory.Read8(uint(context.immediate)+8))
}
// LDBCa Store the contents of register A in the memory location specified by register pair BC.
@@ -34,6 +34,11 @@ func INCBC(context op_context) {
// INCB Increment the contents of register B by 1.
func INCB(context op_context) {
if context.cpu.B&0x0F == 0x0F {
context.cpu.SetHF(true)
} else {
context.cpu.SetHF(false)
}
operations.INC(&context.cpu.B)
context.cpu.SetZF(context.cpu.B == byte(0))
@@ -42,6 +47,11 @@ func INCB(context op_context) {
// DECB Decrement the contents of register B by 1.
func DECB(context op_context) {
if context.cpu.B&0x0F == 0x00 {
context.cpu.SetHF(true)
} else {
context.cpu.SetHF(false)
}
operations.DEC(&context.cpu.B)
context.cpu.SetZF(context.cpu.B == byte(0))
@@ -50,7 +60,7 @@ func DECB(context op_context) {
// LD8B Load the 8-bit immediate operand d8 into register B.
func LD8B(context op_context) {
operations.LD(&context.cpu.B, memory.Read8(context.addr))
operations.LD(&context.cpu.B, memory.Read8(uint(context.immediate)))
}
// RLCA Rotate the contents of register A to the left. The contents of bit 7 are placed in both the CY flag and bit 0 of register A.
@@ -66,5 +76,6 @@ func RLCA(context op_context) {
// LDA16 Store the lower byte of stack pointer SP at the address specified by the 16-bit immediate operand a16, and store the upper byte of SP at address a16 + 1.
func LDA16(context op_context) {
operations.LDInMemory8(uint16(context.immediate), operations.GetLowerByte(context.cpu.SP))
operations.LDInMemory8(uint16(context.immediate+1), operations.GetHigherByte(context.cpu.SP))
}