manchester

gistfile1.txt

unsigned long ct = 0;
unsigned char vs[150];
unsigned char pvs[32];

u8 b = 0;
u8 d = 0;

unsigned int w = 360;

unsigned char *data;
u8 start;
u8 len;
bool ready = false;
int tkc = 0;
unsigned long pt = 0;

void IRAM_ATTR setbit(u8 v, u8 d) {
    u8 bit = (d & 7);
    u8 mask = ~(1 << bit);
    u8 byt = d >> 3;
    pvs[byt] &= mask;
    pvs[byt] |= v << bit;
}

void IRAM_ATTR on_change() {
    pt = micros() - ct;
    ct += pt;
    unsigned char pv = digitalRead(PIN_RFINPUT);

    if (pt > 5000) {
        b = 0;
        d = 0;
        start = 0;
        len = 0;
    } else {
        tkc = ((pt + (w >> 1)) / w);
        for (int i = 0; i < tkc; i++) {
            vs[b++] = pv;
        }

        for (; d < (b >> 1); d++) {
            switch (vs[d << 1] << 1 | vs[1 + (d << 1)]) {
                case 0:
                    ready = true;
                    len = d - start + 1;
                    break;
                case 3:
                    start = d + 2;
                    break;
                case 1:
                    setbit(1, d - start);
                    break;
                case 2:
                    setbit(0, d - start);
                    break;
                default:
                    break;
            }
        }
    }
}