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It's barely an implementation of the 8255, but ensured that data is bounced into the PortHandler, conveniently assuming the interaction mode used by the CPC.

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This commit is contained in:
Thomas Harte 2017-08-01 16:34:13 -04:00
parent 58b98267fc
commit 08ad35efd9
3 changed files with 60 additions and 16 deletions
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49
Components/8255/i8255.hpp
View File

@ -13,28 +13,57 @@ namespace Intel {
namespace i8255 {
class PortHandler {
public:
void set_value(int port, uint8_t value) {}
uint8_t get_value(int port) { return 0xff; }
};
// TODO: most of the implementation below. Right now it just blindly passes data in all directions,
// ignoring operation mode. But at least it establishes proper ownership and hand-off of decision making.
template <class T> class i8255 {
public:
i8255() : control_(0), outputs_{0, 0, 0} {}
void set_register(int address, uint8_t value) {
switch((address >> 8) & 3) {
case 0: printf("PSG data: %d\n", value); break;
case 1: printf("Vsync, etc: %02x\n", value); break;
case 2: printf("Key row, etc: %02x\n", value); break;
case 3: printf("PIO control: %02x\n", value); break;
switch(address & 3) {
case 0: outputs_[0] = value; port_handler_.set_value(0, value); break;
case 1: outputs_[1] = value; port_handler_.set_value(1, value); break;
case 2: outputs_[2] = value; port_handler_.set_value(2, value); break;
case 3:
if(value & 0x80) {
control_ = value;
} else {
if(value & 1) {
outputs_[2] |= 1 << ((value >> 1)&7);
} else {
outputs_[2] &= ~(1 << ((value >> 1)&7));
}
}
update_outputs();
break;
}
}
uint8_t get_register(int address) {
switch((address >> 8) & 3) {
case 0: printf("[In] PSG data\n"); break;
case 1: printf("[In] Vsync, etc\n"); break;
case 2: printf("[In] Key row, etc\n"); break;
case 3: printf("[In] PIO control\n"); break;
switch(address & 3) {
case 0: return port_handler_.get_value(0);
case 1: return port_handler_.get_value(1);
case 2: return port_handler_.get_value(2);
case 3: return control_;
}
return 0xff;
}
private:
void update_outputs() {
port_handler_.set_value(0, outputs_[0]);
port_handler_.set_value(1, outputs_[1]);
port_handler_.set_value(2, outputs_[2]);
}
uint8_t control_;
uint8_t outputs_[3];
T port_handler_;
};
}

21
Machines/AmstradCPC/AmstradCPC.cpp
View File

@ -16,7 +16,7 @@
using namespace AmstradCPC;
struct CRTCBusHandler {
class CRTCBusHandler {
public:
CRTCBusHandler(uint8_t *ram) :
cycles_(0),
@ -249,7 +249,24 @@ struct CRTCBusHandler {
int interrupt_reset_counter_;
};
struct i8255PortHandler : public Intel::i8255::PortHandler {
class i8255PortHandler : public Intel::i8255::PortHandler {
public:
void set_value(int port, uint8_t value) {
switch(port) {
case 0: printf("PSG data: %d\n", value); break;
case 1: printf("Vsync, etc: %02x\n", value); break;
case 2: printf("Key row, etc: %02x\n", value); break;
}
}
uint8_t get_value(int port) {
switch(port) {
case 0: printf("PSG data\n"); break;
case 1: printf("[In] Vsync, etc\n"); break;
case 2: printf("[In] Key row, etc\n"); break;
}
return 0xff;
}
};
class ConcreteMachine:

6
OSBindings/Mac/Clock Signal.xcodeproj/project.pbxproj
View File

@ -421,7 +421,6 @@
4BD4A8D01E077FD20020D856 /* PCMTrackTests.mm in Sources */ = {isa = PBXBuildFile; fileRef = 4BD4A8CF1E077FD20020D856 /* PCMTrackTests.mm */; };
4BD5F1951D13528900631CD1 /* CSBestEffortUpdater.m in Sources */ = {isa = PBXBuildFile; fileRef = 4BD5F1941D13528900631CD1 /* CSBestEffortUpdater.m */; };
4BD69F941D98760000243FE1 /* AcornADF.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 4BD69F921D98760000243FE1 /* AcornADF.cpp */; };
4BD9137B1F3115A8009BCF85 /* i8255.hpp in Sources */ = {isa = PBXBuildFile; fileRef = 4BD913791F3115A8009BCF85 /* i8255.hpp */; };
4BDDBA991EF3451200347E61 /* Z80MachineCycleTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4BDDBA981EF3451200347E61 /* Z80MachineCycleTests.swift */; };
4BE77A2E1D84ADFB00BC3827 /* File.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 4BE77A2C1D84ADFB00BC3827 /* File.cpp */; };
4BE7C9181E3D397100A5496D /* TIA.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 4BE7C9161E3D397100A5496D /* TIA.cpp */; };
@ -997,7 +996,7 @@
4BD5F1941D13528900631CD1 /* CSBestEffortUpdater.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; name = CSBestEffortUpdater.m; path = Updater/CSBestEffortUpdater.m; sourceTree = "<group>"; };
4BD69F921D98760000243FE1 /* AcornADF.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = AcornADF.cpp; sourceTree = "<group>"; };
4BD69F931D98760000243FE1 /* AcornADF.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; path = AcornADF.hpp; sourceTree = "<group>"; };
4BD913791F3115A8009BCF85 /* i8255.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; name = i8255.hpp; path = 8255/i8255.hpp; sourceTree = "<group>"; };
4BD9137D1F311BC5009BCF85 /* i8255.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; name = i8255.hpp; path = 8255/i8255.hpp; sourceTree = "<group>"; };
4BDDBA981EF3451200347E61 /* Z80MachineCycleTests.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = Z80MachineCycleTests.swift; sourceTree = "<group>"; };
4BE77A2C1D84ADFB00BC3827 /* File.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = File.cpp; path = ../../StaticAnalyser/Commodore/File.cpp; sourceTree = "<group>"; };
4BE77A2D1D84ADFB00BC3827 /* File.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; name = File.hpp; path = ../../StaticAnalyser/Commodore/File.hpp; sourceTree = "<group>"; };
@ -2127,7 +2126,7 @@
4BD9137C1F3115AC009BCF85 /* 8255 */ = {
isa = PBXGroup;
children = (
4BD913791F3115A8009BCF85 /* i8255.hpp */,
4BD9137D1F311BC5009BCF85 /* i8255.hpp */,
);
name = 8255;
sourceTree = "<group>";
@ -2684,7 +2683,6 @@
4B2A332A1DB8544D002876E3 /* MemoryFuzzer.cpp in Sources */,
4B55CE5F1C3B7D960093A61B /* MachineDocument.swift in Sources */,
4B2A332F1DB86869002876E3 /* OricOptionsPanel.swift in Sources */,
4BD9137B1F3115A8009BCF85 /* i8255.hpp in Sources */,
4B7913CC1DFCD80E00175A82 /* Video.cpp in Sources */,
4B2A53A11D117D36003C6002 /* CSAtari2600.mm in Sources */,
4BF829661D8F732B001BAE39 /* Disk.cpp in Sources */,