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Diffstat (limited to 'keyboards/ploopyco/opt_encoder.c')
| -rw-r--r-- | keyboards/ploopyco/opt_encoder.c | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/keyboards/ploopyco/opt_encoder.c b/keyboards/ploopyco/opt_encoder.c new file mode 100644 index 000000000..44bcd5eb8 --- /dev/null +++ b/keyboards/ploopyco/opt_encoder.c @@ -0,0 +1,211 @@ +/* Copyright 2020 Christopher Courtney, aka Drashna Jael're (@drashna) <drashna@live.com> + * Copyright 2020 Ploopy Corporation + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ +#include "opt_encoder.h" + +/* Setup function for the scroll wheel. Initializes + the relevant variables. */ +void opt_encoder_init(void) { + state = HIHI; + lohif = false; + hilof = false; + lowA = 1023; + highA = 0; + cLowA = false; + cHighA = false; + lowIndexA = 0; + highIndexA = 0; + lowOverflowA = false; + highOverflowA = false; + lowB = 1023; + highB = 0; + cLowB = false; + cHighB = false; + lowIndexB = 0; + highIndexB = 0; + lowOverflowB = false; + highOverflowB = false; + scrollThresholdA = 0; + scrollThresholdB = 0; +} + +int opt_encoder_handler(int curA, int curB) { + if (lowOverflowA == false || highOverflowA == false) calculateThresholdA(curA); + if (lowOverflowB == false || highOverflowB == false) calculateThresholdB(curB); + + bool LO = false; + bool HI = true; + bool sA, sB; + int ret = 0; + + if (curA < scrollThresholdA) + sA = LO; + else + sA = HI; + + if (curB < scrollThresholdB) + sB = LO; + else + sB = HI; + + if (state == HIHI) { + if (sA == LO && sB == HI) { + state = LOHI; + if (hilof) { + ret = 1; + hilof = false; + } + } else if (sA == HI && sB == LO) { + state = HILO; + if (lohif) { + ret = -1; + lohif = false; + } + } + } + + else if (state == HILO) { + if (sA == HI && sB == HI) { + state = HIHI; + hilof = true; + lohif = false; + } else if (sA == LO && sB == LO) { + state = LOLO; + hilof = true; + lohif = false; + } + } + + else if (state == LOLO) { + if (sA == HI && sB == LO) { + state = HILO; + if (lohif) { + ret = 1; + lohif = false; + } + } else if (sA == LO && sB == HI) { + state = LOHI; + if (hilof) { + ret = -1; + hilof = false; + } + } + } + + else { // state must be LOHI + if (sA == HI && sB == HI) { + state = HIHI; + lohif = true; + hilof = false; + } else if (sA == LO && sB == LO) { + state = LOLO; + lohif = true; + hilof = false; + } + } + + return ret; +} + +void calculateThresholdA(int curA) { scrollThresholdA = calculateThreshold(curA, &lowA, &highA, &cLowA, &cHighA, arLowA, arHighA, &lowIndexA, &highIndexA, &lowOverflowA, &highOverflowA); } + +void calculateThresholdB(int curB) { scrollThresholdB = calculateThreshold(curB, &lowB, &highB, &cLowB, &cHighB, arLowB, arHighB, &lowIndexB, &highIndexB, &lowOverflowB, &highOverflowB); } + +int calculateThreshold(int cur, int* low, int* high, bool* cLow, bool* cHigh, int arLow[], int arHigh[], int* lowIndex, int* highIndex, bool* lowOverflow, bool* highOverflow) { + if (cur < *low) *low = cur; + if (cur > *high) *high = cur; + + int curThresh = thresholdEquation(*low, *high); + int range = *high - *low; + + // The range is enforced to be over a certain limit because noise + // can cause erroneous readings, making these calculations unstable. + if (range >= SCROLL_THRESH_RANGE_LIM) { + if (cur < curThresh) { + if (*cHigh == true) { + // We were just high, and now we crossed to low. + // high reflects a sample of a high reading. + arHigh[*highIndex] = *high; + incrementIndex(highIndex, highOverflow); + int midpoint = ((*high - *low) / 2) + *low; + *low = midpoint; + *high = midpoint; + *cLow = false; + *cHigh = false; + } else { + *cLow = true; + } + } + if (cur > curThresh) { + if (*cLow == true) { + // We were just low, and now we crossed to high. + // low reflects a sample of a low reading. + arLow[*lowIndex] = *low; + incrementIndex(lowIndex, lowOverflow); + int midpoint = ((*high - *low) / 2) + *low; + *low = midpoint; + *high = midpoint; + *cLow = false; + *cHigh = false; + } else { + *cHigh = true; + } + } + } + + int calcHigh = 0; + if (*highOverflow == true) { + for (int i = 0; i < SCROLLER_AR_SIZE; i++) { + calcHigh += arHigh[i]; + } + calcHigh = calcHigh / SCROLLER_AR_SIZE; + } else if (*highIndex != 0) { + for (int i = 0; i < *highIndex; i++) { + calcHigh += arHigh[i]; + } + calcHigh = calcHigh / *highIndex; + } else { + calcHigh = *high; + } + + int calcLow = 0; + if (*lowOverflow == true) { + for (int i = 0; i < SCROLLER_AR_SIZE; i++) { + calcLow += arLow[i]; + } + calcLow = calcLow / SCROLLER_AR_SIZE; + } else if (*lowIndex != 0) { + for (int i = 0; i < *lowIndex; i++) { + calcLow += arLow[i]; + } + calcLow = calcLow / *lowIndex; + } else { + calcLow = *low; + } + + return thresholdEquation(calcLow, calcHigh); +} + +int thresholdEquation(int lo, int hi) { return ((hi - lo) / 3) + lo; } + +void incrementIndex(int* index, bool* ovflw) { + if (*index < SCROLLER_AR_SIZE - 1) + (*index)++; + else { + *index = 0; + *ovflw = true; + } +} |