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Adds an attempt to clock the AY.

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This commit is contained in:
Thomas Harte 2017-08-02 07:21:33 -04:00
parent f7e66dea61
commit f602f9b6ec
1 changed files with 50 additions and 19 deletions
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69
Machines/AmstradCPC/AmstradCPC.cpp
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@ -62,6 +62,38 @@ class InterruptTimer {
int timer_;
};
class AYDeferrer {
public:
inline void setup_output() {
ay_.reset(new GI::AY38910);
ay_->set_input_rate(1000000);
}
inline void close_output() {
ay_.reset();
}
inline void run_for(HalfCycles half_cycles) {
cycles_since_update_ += half_cycles;
}
inline void flush() {
ay_->run_for(cycles_since_update_.divide_cycles(Cycles(4)));
}
std::shared_ptr<Outputs::Speaker> get_speaker() {
return ay_;
}
GI::AY38910 *ay() {
return ay_.get();
}
private:
std::shared_ptr<GI::AY38910> ay_;
HalfCycles cycles_since_update_;
};
class CRTCBusHandler {
public:
CRTCBusHandler(uint8_t *ram, InterruptTimer &interrupt_timer) :
@ -301,13 +333,14 @@ struct KeyboardState {
class i8255PortHandler : public Intel::i8255::PortHandler {
public:
i8255PortHandler(const KeyboardState &key_state, const CRTCBusHandler &crtc_bus_handler) :
key_state_(key_state), crtc_bus_handler_(crtc_bus_handler) {}
i8255PortHandler(const KeyboardState &key_state, const CRTCBusHandler &crtc_bus_handler, AYDeferrer &ay) :
key_state_(key_state), crtc_bus_handler_(crtc_bus_handler), ay_(ay) {}
void set_value(int port, uint8_t value) {
switch(port) {
case 0:
ay_->set_data_input(value);
ay_.flush();
ay_.ay()->set_data_input(value);
break;
case 1:
// printf("Vsync, etc: %02x\n", value);
@ -316,13 +349,13 @@ class i8255PortHandler : public Intel::i8255::PortHandler {
// TODO: the AY really should allow port communications to be active. Work needed.
int key_row = value & 15;
if(key_row < 10) {
ay_->set_port_input(false, key_state_.rows[key_row]);
ay_.ay()->set_port_input(false, key_state_.rows[key_row]);
} else {
ay_->set_port_input(false, 0xff);
ay_.ay()->set_port_input(false, 0xff);
}
// TODO: set casette motor control: ((value >> 4) & 1)
// TODO: set casette output: ((value >> 5) & 1)
ay_->set_control_lines(
ay_.ay()->set_control_lines(
(GI::AY38910::ControlLines)(
((value & 0x80) ? GI::AY38910::BDIR : 0) |
((value & 0x40) ? GI::AY38910::BC1 : 0) |
@ -334,7 +367,7 @@ class i8255PortHandler : public Intel::i8255::PortHandler {
uint8_t get_value(int port) {
switch(port) {
case 0: return ay_->get_data_output();
case 0: return ay_.ay()->get_data_output();
case 1: return (crtc_bus_handler_.get_vsync() ? 1 : 0) | 0xfe;
case 2:
// printf("[In] Key row, etc\n");
@ -343,12 +376,8 @@ class i8255PortHandler : public Intel::i8255::PortHandler {
return 0xff;
}
void set_ay(std::shared_ptr<GI::AY38910> ay) {
ay_ = ay;
}
private:
std::shared_ptr<GI::AY38910> ay_;
AYDeferrer &ay_;
const KeyboardState &key_state_;
const CRTCBusHandler &crtc_bus_handler_;
};
@ -362,7 +391,7 @@ class ConcreteMachine:
crtc_(crtc_bus_handler_),
crtc_bus_handler_(ram_, interrupt_timer_),
i8255_(i8255_port_handler_),
i8255_port_handler_(key_state_, crtc_bus_handler_) {
i8255_port_handler_(key_state_, crtc_bus_handler_, ay_) {
// primary clock is 4Mhz
set_clock_rate(4000000);
}
@ -381,6 +410,9 @@ class ConcreteMachine:
if(crtc_cycles) crtc_.run_for(Cycles(1));
set_interrupt_line(interrupt_timer_.get_request());
// Pump the AY.
ay_.run_for(cycle.length);
// Stop now if no action is strictly required.
if(!cycle.is_terminal()) return HalfCycles(0);
@ -455,18 +487,17 @@ class ConcreteMachine:
}
void flush() {
// i8255_port_handler_.flush();
ay_.flush();
}
void setup_output(float aspect_ratio) {
crtc_bus_handler_.setup_output(aspect_ratio);
ay_.reset(new GI::AY38910);
i8255_port_handler_.set_ay(ay_);
ay_.setup_output();
}
void close_output() {
crtc_bus_handler_.close_output();
ay_.reset();
ay_.close_output();
}
std::shared_ptr<Outputs::CRT::CRT> get_crt() {
@ -474,7 +505,7 @@ class ConcreteMachine:
}
std::shared_ptr<Outputs::Speaker> get_speaker() {
return ay_;
return ay_.get_speaker();
}
void run_for(const Cycles cycles) {
@ -517,7 +548,7 @@ class ConcreteMachine:
CRTCBusHandler crtc_bus_handler_;
Motorola::CRTC::CRTC6845<CRTCBusHandler> crtc_;
std::shared_ptr<GI::AY38910> ay_;
AYDeferrer ay_;
i8255PortHandler i8255_port_handler_;
Intel::i8255::i8255<i8255PortHandler> i8255_;