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Adds port input.

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This commit is contained in:
Thomas Harte
2021-07-18 20:25:04 -04:00
parent c425dec4d5
commit a030d9935e
3 changed files with 15 additions and 2 deletions
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Components/6526/Implementation/6526Implementation.hpp
+8
View File
@@ -21,6 +21,12 @@ template <int port> void MOS6526<BusHandlerT, personality>::set_port_output() {
port_handler_.set_port_output(Port(port), output);
}
template <typename BusHandlerT, Personality personality>
template <int port> uint8_t MOS6526<BusHandlerT, personality>::get_port_input() {
const uint8_t input = port_handler_.get_port_input(Port(port));
return (input & ~registers_.data_direction[port]) | (registers_.output[port] & registers_.data_direction[port]);
}
template <typename BusHandlerT, Personality personality>
void MOS6526<BusHandlerT, personality>::write(int address, uint8_t value) {
address &= 0xf;
@@ -56,6 +62,8 @@ template <typename BusHandlerT, Personality personality>
uint8_t MOS6526<BusHandlerT, personality>::read(int address) {
address &= 0xf;
switch(address) {
case 0: return get_port_input<0>();
case 1: return get_port_input<1>();
case 2: case 3:
return registers_.data_direction[address - 2];
Components/6526/Implementation/6526Storage.hpp
-1
View File
@@ -16,7 +16,6 @@ struct MOS6526Storage {
struct Registers {
uint8_t output[2] = {0, 0};
uint8_t input[2] = {0, 0};
uint8_t data_direction[2] = {0, 0};
} registers_;