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Factors out some boilerplate.
When I'm confident this is correct, I can fix up the other call sites.
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@ -164,6 +164,31 @@ template <bool is_stereo> class AY38910: public ::Outputs::Speaker::SampleSource
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uint8_t c_left_ = 255, c_right_ = 255;
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};
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/*!
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Provides helper code, to provide something closer to the interface exposed by many
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AY-deploying machines of the era.
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*/
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struct Utility {
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template <typename AY> static void select_register(AY &ay, uint8_t reg) {
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ay.set_control_lines(GI::AY38910::ControlLines(GI::AY38910::BDIR | GI::AY38910::BC2 | GI::AY38910::BC1));
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ay.set_data_input(reg);
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ay.set_control_lines(GI::AY38910::ControlLines(0));
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}
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template <typename AY> static void write_data(AY &ay, uint8_t reg) {
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ay.set_control_lines(GI::AY38910::ControlLines(GI::AY38910::BDIR | GI::AY38910::BC2));
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ay.set_data_input(reg);
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ay.set_control_lines(GI::AY38910::ControlLines(0));
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}
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template <typename AY> static uint8_t read_data(AY &ay) {
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ay.set_control_lines(GI::AY38910::ControlLines(GI::AY38910::BC2 | GI::AY38910::BC1));
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const uint8_t result = ay.get_data_output();
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ay.set_control_lines(GI::AY38910::ControlLines(0));
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return result;
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}
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};
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}
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}
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@ -213,17 +213,13 @@ template<Model model> class ConcreteMachine:
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case 0xfffd:
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// Select AY register.
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update_audio();
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ay_.set_control_lines(GI::AY38910::ControlLines(GI::AY38910::BDIR | GI::AY38910::BC2 | GI::AY38910::BC1));
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ay_.set_data_input(*cycle.value);
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ay_.set_control_lines(GI::AY38910::ControlLines(0));
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GI::AY38910::Utility::select_register(ay_, *cycle.value);
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break;
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case 0xbffd:
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// Write to AY register.
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update_audio();
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ay_.set_control_lines(GI::AY38910::ControlLines(GI::AY38910::BDIR | GI::AY38910::BC2));
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ay_.set_data_input(*cycle.value);
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ay_.set_control_lines(GI::AY38910::ControlLines(0));
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GI::AY38910::Utility::write_data(ay_, *cycle.value);
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break;
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}
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break;
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@ -265,9 +261,7 @@ template<Model model> class ConcreteMachine:
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case 0xfffd:
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// Read from AY register.
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update_audio();
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ay_.set_control_lines(GI::AY38910::ControlLines(GI::AY38910::BC2 | GI::AY38910::BC1));
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*cycle.value &= ay_.get_data_output();
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ay_.set_control_lines(GI::AY38910::ControlLines(0));
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*cycle.value &= GI::AY38910::Utility::read_data(ay_);
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break;
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}
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break;
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