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31 lines
618 B
C
31 lines
618 B
C
#include "sms_pad.h"
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void pad_init(Pad *pad, Tristate *TH)
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{
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pad->pressed = 0xff;
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pad->TH = TH;
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}
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void pad_setbtn(Pad *pad, PAD_BTN btn, bool pressed)
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{
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if (pressed) {
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pad->pressed &= ~(1 << btn);
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} else {
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pad->pressed |= (1 << btn);
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}
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}
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uint8_t pad_rd(Pad *pad)
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{
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uint8_t res;
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if (*pad->TH == TRI_LOW) { // TH selected
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// A and START shifted in from bits 7:6 into 5:4
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res = (pad->pressed & 0xf) | ((pad->pressed & 0xc0) >> 2);
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} else {
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res = pad->pressed & 0x3f;
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}
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// Bits 7:6 are always high
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res |= 0b11000000;
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return res;
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}
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