mirror of
https://github.com/lefticus/6502-cpp.git
synced 2024-10-09 17:56:19 +00:00
52 lines
871 B
C++
52 lines
871 B
C++
#include <cstdint>
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enum class Colors : uint8_t
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{
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WHITE=0x01,
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BLACK=0x00
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};
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volatile uint8_t &memory_loc(const uint16_t loc)
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{
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return *reinterpret_cast<volatile uint8_t *>(loc);
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}
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void decrement_border_color()
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{
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--memory_loc(0xd020);
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}
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void increment_border_color()
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{
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++memory_loc(0xd020);
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}
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bool joystick_down()
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{
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uint8_t joystick_state = memory_loc(0xDC00);
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return (joystick_state & 0x2) == 0;
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}
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int main()
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{
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const auto background_color = [](Colors col) {
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memory_loc(0xd021) = static_cast<uint8_t>(col);
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};
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const auto border_color = [](Colors col) {
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memory_loc(0xd020) = static_cast<uint8_t>(col);
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};
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background_color(Colors::WHITE);
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bool joydown = joystick_down();
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while(true) {
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bool newjoydown = joystick_down();
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if (joydown != newjoydown) {
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increment_border_color();
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joydown = newjoydown;
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}
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}
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}
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