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6502-cpp/examples/test3.cpp
2016-07-07 10:51:54 -06:00

52 lines
871 B
C++

#include <cstdint>
enum class Colors : uint8_t
{
WHITE=0x01,
BLACK=0x00
};
volatile uint8_t &memory_loc(const uint16_t loc)
{
return *reinterpret_cast<volatile uint8_t *>(loc);
}
void decrement_border_color()
{
--memory_loc(0xd020);
}
void increment_border_color()
{
++memory_loc(0xd020);
}
bool joystick_down()
{
uint8_t joystick_state = memory_loc(0xDC00);
return (joystick_state & 0x2) == 0;
}
int main()
{
const auto background_color = [](Colors col) {
memory_loc(0xd021) = static_cast<uint8_t>(col);
};
const auto border_color = [](Colors col) {
memory_loc(0xd020) = static_cast<uint8_t>(col);
};
background_color(Colors::WHITE);
bool joydown = joystick_down();
while(true) {
bool newjoydown = joystick_down();
if (joydown != newjoydown) {
increment_border_color();
joydown = newjoydown;
}
}
}