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Adds the ability for the 68901 to decline an interrupt acknowledgement.

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This commit is contained in:
Thomas Harte 2019-10-31 19:57:36 -04:00
parent 5309ac7c30
commit a5bbf54a27
2 changed files with 8 additions and 2 deletions
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6
Components/68901/MFP68901.cpp
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@ -321,7 +321,11 @@ bool MFP68901::get_interrupt_line() {
return interrupt_line_; return interrupt_line_;
} }
uint8_t MFP68901::acknowledge_interrupt() { int MFP68901::acknowledge_interrupt() {
if(!(interrupt_pending_ & interrupt_mask_)) {
return NoAcknowledgement;
}
const int selected = fls(interrupt_pending_ & interrupt_mask_) - 1; const int selected = fls(interrupt_pending_ & interrupt_mask_) - 1;
const int mask = 1 << selected; const int mask = 1 << selected;

4
Components/68901/MFP68901.hpp
View File

@ -36,7 +36,9 @@ class MFP68901: public ClockingHint::Source {
uint8_t get_port_output(); uint8_t get_port_output();
bool get_interrupt_line(); bool get_interrupt_line();
uint8_t acknowledge_interrupt();
const int NoAcknowledgement = 0x100;
int acknowledge_interrupt();
struct InterruptDelegate { struct InterruptDelegate {
virtual void mfp68901_did_change_interrupt_status(MFP68901 *) = 0; virtual void mfp68901_did_change_interrupt_status(MFP68901 *) = 0;