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Correct uPD7002 interrupt wiring.

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This commit is contained in:
Thomas Harte
2025-09-20 21:51:19 -04:00
parent 5e78ac3af5
commit fb5ef200fb
3 changed files with 17 additions and 8 deletions
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18
Components/uPD7002/uPD7002.cpp
View File

@@ -24,9 +24,8 @@ void uPD7002::run_for(const HalfCycles count) {
if(count >= conversion_time_remaining_) {
conversion_time_remaining_ = HalfCycles(0);
interrupt_ = true;
result_ = uint16_t(inputs_[channel_] * 65535.0f) & (high_precision_ ? 0xfff0 : 0xff00);
if(delegate_) delegate_->did_change_interrupt_status(*this);
set_interrupt(true);
return;
}
@@ -40,11 +39,11 @@ bool uPD7002::interrupt() const {
void uPD7002::write(const uint16_t address, const uint8_t value) {
const auto local_address = address & 3;
if(!local_address) {
interrupt_ = false;
channel_ = value & 0b0000'0011;
spare_ = value & 0b0000'0100;
high_precision_ = value & 0b0000'1000;
conversion_time_remaining_ = high_precision_ ? slow_period_ : fast_period_;
set_interrupt(false);
return;
}
}
@@ -54,8 +53,7 @@ uint8_t uPD7002::read(const uint16_t address) {
default:
case 0: return status();
case 1:
interrupt_ = false;
if(delegate_) delegate_->did_change_interrupt_status(*this);
set_interrupt(false);
return uint8_t(result_ >> 8);
case 2: return uint8_t(result_);
case 3: return 0xff;
@@ -71,3 +69,13 @@ uint8_t uPD7002::status() const {
(conversion_time_remaining_ > HalfCycles(0) ? 0x00 : 0x40) |
(interrupt_ ? 0x00 : 0x80);
}
void uPD7002::set_delegate(Delegate *const delegate) {
delegate_ = delegate;
}
void uPD7002::set_interrupt(const bool value) {
if(interrupt_ == value) return;
interrupt_ = value;
if(delegate_) delegate_->did_change_interrupt_status(*this);
}

1
Components/uPD7002/uPD7002.hpp
View File

@@ -44,6 +44,7 @@ private:
HalfCycles fast_period_, slow_period_;
uint8_t status() const;
void set_interrupt(bool);
Delegate *delegate_ = nullptr;
};

6
Machines/Acorn/BBCMicro/BBCMicro.cpp
View File

@@ -539,6 +539,7 @@ public:
system_via_port_handler_.set_interrupt_delegate(this);
user_via_port_handler_.set_interrupt_delegate(this);
adc_.set_delegate(this);
// Grab ROMs.
using Request = ::ROM::Request;
@@ -812,7 +813,7 @@ private:
// MARK: - uPD7002::Delegate.
void did_change_interrupt_status(NEC::uPD7002 &) override {
update_irq_line();
system_via_.set_control_line_input<MOS::MOS6522::Port::B, MOS::MOS6522::Line::One>(adc_.interrupt());
}
// MARK: - MediaTarget.
@@ -868,8 +869,7 @@ private:
void update_irq_line() {
m6502_.set_irq_line(
user_via_.get_interrupt_line() ||
system_via_.get_interrupt_line() /*||
adc_.interrupt()*/
system_via_.get_interrupt_line()
);
}