scawful/yaze
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

add experimental single-cycle step control to spc700

Browse Source
This commit is contained in:
scawful
2024-05-11 13:56:19 -04:00
parent d42421a5a6
commit a6907044bd
3 changed files with 57 additions and 25 deletions
Download Patch File Download Diff File Expand all files Collapse all files

33
src/app/emu/audio/spc700.h
View File

@@ -76,6 +76,15 @@ class Spc700 {
bool stopped_;
bool reset_wanted_;
// single-cycle
uint8_t opcode;
uint32_t step = 0;
uint32_t bstep;
uint16_t adr;
uint16_t adr1;
uint8_t dat;
uint16_t dat16;
uint8_t param;
const uint8_t ipl_rom_[64]{
0xCD, 0xEF, 0xBD, 0xE8, 0x00, 0xC6, 0x1D, 0xD0, 0xFC, 0x8F, 0xAA,
@@ -97,14 +106,14 @@ class Spc700 {
uint8_t SP = 0x00; // stack pointer
struct Flags {
uint8_t N : 1; // Negative flag
uint8_t V : 1; // Overflow flag
uint8_t P : 1; // Direct page flag
uint8_t B : 1; // Break flag
uint8_t H : 1; // Half-carry flag
uint8_t I : 1; // Interrupt enable
uint8_t Z : 1; // Zero flag
uint8_t C : 1; // Carry flag
bool N : 1; // Negative flag
bool V : 1; // Overflow flag
bool P : 1; // Direct page flag
bool B : 1; // Break flag
bool H : 1; // Half-carry flag
bool I : 1; // Interrupt enable
bool Z : 1; // Zero flag
bool C : 1; // Carry flag
};
Flags PSW; // Processor status word
@@ -139,12 +148,12 @@ class Spc700 {
uint16_t read_word(uint16_t address) {
uint8_t adrl = address;
uint8_t adrh = address + 1;
uint8_t value = read(adrl);
return value | (read(adrh) << 8);
uint8_t value = callbacks_.read(adrl);
return value | (callbacks_.read(adrh) << 8);
}
uint8_t ReadOpcode() {
uint8_t opcode = read(PC++);
uint8_t opcode = callbacks_.read(PC++);
return opcode;
}
@@ -169,7 +178,7 @@ class Spc700 {
}
void push_byte(uint8_t value) {
write(0x100 | SP, value);
callbacks_.write(0x100 | SP, value);
SP--;
}