mirror of
https://github.com/hsoft/collapseos.git
synced 2024-11-01 19:20:56 +11:00
31 lines
618 B
C
31 lines
618 B
C
#include "sms_pad.h"
|
|
|
|
void pad_init(Pad *pad, Tristate *TH)
|
|
{
|
|
pad->pressed = 0xff;
|
|
pad->TH = TH;
|
|
}
|
|
|
|
void pad_setbtn(Pad *pad, PAD_BTN btn, bool pressed)
|
|
{
|
|
if (pressed) {
|
|
pad->pressed &= ~(1 << btn);
|
|
} else {
|
|
pad->pressed |= (1 << btn);
|
|
}
|
|
}
|
|
|
|
uint8_t pad_rd(Pad *pad)
|
|
{
|
|
uint8_t res;
|
|
if (*pad->TH == TRI_LOW) { // TH selected
|
|
// A and START shifted in from bits 7:6 into 5:4
|
|
res = (pad->pressed & 0xf) | ((pad->pressed & 0xc0) >> 2);
|
|
} else {
|
|
res = pad->pressed & 0x3f;
|
|
}
|
|
// Bits 7:6 are always high
|
|
res |= 0b11000000;
|
|
return res;
|
|
}
|