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Provide a more convincing version of port output.

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This commit is contained in:
Thomas Harte 2021-02-08 18:14:08 -05:00
parent 77b1efd176
commit 82312d3b59
2 changed files with 13 additions and 4 deletions
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16
InstructionSets/M50740/Executor.cpp
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@ -101,6 +101,11 @@ uint8_t Executor::read(uint16_t address) {
}
}
void Executor::set_port_output(int port) {
// Force 'output' to a 1 anywhere that a bit is set as input.
port_handler_.set_port_output(port, port_outputs_[port] | ~port_directions_[port]);
}
void Executor::write(uint16_t address, uint8_t value) {
// printf("%04x <- %02x\n", address, value);
@ -127,13 +132,16 @@ void Executor::write(uint16_t address, uint8_t value) {
case 0xe4: case 0xe8: {
const int port = port_remap[(address - 0xe0) >> 1];
port_outputs_[port] = value;
return port_handler_.set_port_output(port, value);
set_port_output(port);
}
break;
case 0xe1: case 0xe3:
case 0xe5: case 0xe9:
port_directions_[port_remap[(address - 0xe0) >> 1]] = value;
break;
case 0xe5: case 0xe9: {
const int port = port_remap[(address - 0xe0) >> 1];
port_directions_[port] = value;
set_port_output(port);
} break;
// Timers.
case 0xf9: prescalers_[0].reload_value = value; break;

1
InstructionSets/M50740/Executor.hpp
View File

@ -159,6 +159,7 @@ class Executor: public CachingExecutor {
inline void set_flags(uint8_t);
inline uint8_t flags();
template<bool is_brk> inline void perform_interrupt();
inline void set_port_output(int port);
// MARK: - Execution time