mirror of
https://github.com/lefticus/6502-cpp.git
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5591249f2a
* need to add a decent header address * probably need to fix sbrc and sbrs
50 lines
842 B
C++
50 lines
842 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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inline 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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inline void decrement_border_color()
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{
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--memory_loc(0xd020);
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}
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inline void increment_border_color()
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{
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++memory_loc(0xd020);
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}
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inline 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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while(true) {
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if (joystick_down()) {
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border_color(Colors::WHITE);
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} else {
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border_color(Colors::BLACK);
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}
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}
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}
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