mirror of https://github.com/bsnes-emu/bsnes.git
65 lines
1.3 KiB
C++
65 lines
1.3 KiB
C++
auto uPD96050::readSR() -> uint8 {
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return regs.sr >> 8;
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}
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auto uPD96050::writeSR(uint8 data) -> void {
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}
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auto uPD96050::readDR() -> uint8 {
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if(regs.sr.drc == 0) {
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//16-bit
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if(regs.sr.drs == 0) {
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regs.sr.drs = 1;
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return regs.dr >> 0;
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} else {
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regs.sr.rqm = 0;
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regs.sr.drs = 0;
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return regs.dr >> 8;
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}
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} else {
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//8-bit
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regs.sr.rqm = 0;
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return regs.dr >> 0;
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}
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}
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auto uPD96050::writeDR(uint8 data) -> void {
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if(regs.sr.drc == 0) {
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//16-bit
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if(regs.sr.drs == 0) {
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regs.sr.drs = 1;
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regs.dr = (regs.dr & 0xff00) | (data << 0);
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} else {
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regs.sr.rqm = 0;
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regs.sr.drs = 0;
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regs.dr = (data << 8) | (regs.dr & 0x00ff);
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}
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} else {
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//8-bit
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regs.sr.rqm = 0;
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regs.dr = (regs.dr & 0xff00) | (data << 0);
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}
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}
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auto uPD96050::readDP(uint12 addr) -> uint8 {
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bool hi = addr & 1;
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addr = (addr >> 1) & 2047;
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if(hi == false) {
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return dataRAM[addr] >> 0;
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} else {
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return dataRAM[addr] >> 8;
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}
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}
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auto uPD96050::writeDP(uint12 addr, uint8 data) -> void {
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bool hi = addr & 1;
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addr = (addr >> 1) & 2047;
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if(hi == false) {
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dataRAM[addr] = (dataRAM[addr] & 0xff00) | (data << 0);
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} else {
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dataRAM[addr] = (dataRAM[addr] & 0x00ff) | (data << 8);
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}
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}
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