int16_t CTRLState1;
int16_t CTRLState2;
int16_t CTRLBitBuf_Pos;
int16_t CTRL_H, CTRL_T, CTRL_MAX;
int8_t CTRLBitBuffer[4000]; // not sure how long this buffer really is
int8_t CTRL_BUFFER[0x1F4]; // 500-byte ring buffer
uint8_t getCTS();

void readCTRL() {
    int i;
    if (CTRLState1 == 0) {
        // look for a high bit (start bit?)
        if (getCTS() == 0) return; // return if there is a low bit
        CTRLState1 += 1;
        CTRLState2 = 4;
        CTRLBitBuf_Pos = 0;
    } else {
        CTRLState1 += 1;
        if (CTRLState2 > CTRLState1) return;
        if (CTRLState1 > 4) {
            if (CTRLState1 >= 0x5E) {
                if (getCTS() == 0xFF) { // look for 00 (stop bit?)
                    CTRLState1 = CTRLState2 = CTRLBitBuf_Pos = 0;
                } else {
                    int32_t temp;
                    i = CTRLBitBuf_Pos-1;
                    for (i=CTRLBitBuf_Pos-1; i>0; i--) {
                        if (CTRLBitBuffer[i] < 0) { // CTS was high/1
                            temp &= ~(1 << i); // clear bit i of temp
                        } else {
                            temp |= 1 << i; // set bit i of temp
                        }
                    }
                    CTRL_BUFFER[CTRL_H] = temp;
                    CTRL_H++;
                    if (CTRL_H == 0x1F4) CTRL_H = 0;
                    int c = CTRL_H-CTRL_T;
                    if (CTRL_H < CTRL_T) c += 0x1F4;
                    (HEAP_3B897+$25CB) = c; // not sure what this variable is used for
                    if (c >= CTRL_MAX) CTRL_MAX = c;
                    CTRLState1 = CTRLState2 = CTRLBitBuf_Pos = 0;
                    return;
                }
            } else {
                CTRLBitBuffer[CTRLBitBuf_Pos] = getCTS();
                CTRLBitBuf_Pos += 1;
                CTRLState2 += 0xA;
            }
        } else {
            if (getCTS() == 0) {
                CTRLState1 = CTRLState2 = CTRLBitBuf_Pos = 0;
            } else {
                CTRLState2 = 0xE;
                for (i=0;i<8;i++) { // set the first 8 bits of the bit buffer to 0s?
                    CTRLBitBuffer[i] = 0;
                }
                return;
            }
        }
    }
}