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Add comments, correct address decoding.

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This commit is contained in:
Thomas Harte
2025-09-18 12:27:13 -04:00
parent 4c49ffe3d1
commit 421bf28582
2 changed files with 11 additions and 3 deletions
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9
Components/uPD7002/uPD7002.cpp
View File

@@ -38,7 +38,8 @@ bool uPD7002::interrupt() const {
}
void uPD7002::write(const uint16_t address, const uint8_t value) {
if(!address) {
const auto local_address = address & 3;
if(!local_address) {
channel_ = value & 3;
high_precision_ = value & 8;
conversion_time_remaining_ = high_precision_ ? slow_period_ : fast_period_;
@@ -47,11 +48,13 @@ void uPD7002::write(const uint16_t address, const uint8_t value) {
}
uint8_t uPD7002::read(const uint16_t address) {
if(!address) {
const auto local_address = address & 3;
if(!local_address) {
return status();
}
if(address & 1) {
// TODO: verify this decoding.
if(local_address & 1) {
interrupt_ = false;
if(delegate_) delegate_->did_change_interrupt_status(*this);
return uint8_t(result_ >> 8);

5
Components/uPD7002/uPD7002.hpp
View File

@@ -12,11 +12,14 @@ namespace NEC {
class uPD7002 {
public:
/// Constructs a PD7002 that will receive @c run_for updates at the specified clock rate.
uPD7002(HalfCycles clock_rate);
void run_for(HalfCycles);
/// @returns The current state of the interrupt line.
bool interrupt() const;
/// Defines a mean for an observer to receive notifications upon updates to the interrupt line.
struct Delegate {
virtual void did_change_interrupt_status(uPD7002 &) = 0;
};
@@ -25,6 +28,8 @@ public:
void write(uint16_t address, uint8_t value);
uint8_t read(uint16_t address);
/// Sets the floating point value, which should be in the range [0.0, 1.0], for the signal currently
/// being supplied to @c channel.
void set_input(int channel, float value);
private: