Adds support for JacoBurge's TouchPad (#4186)

* add touchpad

* progress

* working with leds and vibrations

* adds readme

* Update keyboards/touchpad/readme.md

Co-Authored-By: jackhumbert <jack.humb@gmail.com>

* updates

1 files changed, 291 insertions, 0 deletions

diff --git a/keyboards/touchpad/matrix.c b/keyboards/touchpad/matrix.c
new file mode 100644
index 000000000..3af4c5c3c
--- /dev/null
+++ b/keyboards/touchpad/matrix.c
@@ -0,0 +1,291 @@
+/*
+MIT License
+Copyright (c) 2018, JacoBurge
+Adapted for QMK by Jack Humbert in 2018
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#include "matrix.h"
+#include "i2c_master.h"
+#include "quantum.h"
+
+#define VIBRATE_LENGTH 50 //Defines number of interrupts motor will vibrate for, must be bigger than 8 for correct operation
+volatile uint8_t vibrate = 0; //Trigger vibration in interrupt
+
+static matrix_row_t matrix[MATRIX_ROWS];
+
+const uint8_t SENr[6] = {1, 2, 3, 5, 6, 7};//Maps capacitive pads to pins
+const uint8_t SENc[6] = {0, 4, 8, 9, 10, 11};
+
+volatile uint8_t LEDs[6][6] = {{0}};//Stores current LED values
+
+//Read data from the cap touch IC
+uint8_t readDataFromTS(uint8_t reg) {
+  uint8_t rx[1] = { 0 };
+  if (i2c_readReg(0x1C << 1, reg, rx, 1, 100) == 0) {
+    return rx[0];
+  }
+  return 0;
+}
+
+//Write data to cap touch IC
+uint8_t writeDataToTS(uint8_t reg, uint8_t data) {
+  uint8_t tx[2] = { reg, data };
+  if (i2c_transmit(0x1C << 1, tx, 2, 100) == 0) {
+    return 1;
+  } else {
+    return 0;
+  }
+}
+
+
+uint8_t checkTSPres(void) {
+  return (readDataFromTS(0x00) == 0x3E);
+}
+
+uint8_t capSetup(void) {
+
+  uint8_t temp_return = checkTSPres();
+
+  if (temp_return == 1) {
+    // Perform measurements every 16ms
+    writeDataToTS(0x08, 1);
+
+    // Increase detection integrator value
+    writeDataToTS(0x0B, 1);
+
+    // Oversample to gain two bits for columns
+    writeDataToTS(0x28, 0x42);
+    writeDataToTS(0x29, 0x00);
+    writeDataToTS(0x2A, 0x00);
+    writeDataToTS(0x2B, 0x00);
+    writeDataToTS(0x2C, 0x42);
+    writeDataToTS(0x2D, 0x00);
+    writeDataToTS(0x2E, 0x00);
+    writeDataToTS(0x2F, 0x00);
+    writeDataToTS(0x30, 0x42);
+    writeDataToTS(0x31, 0x42);
+    writeDataToTS(0x32, 0x42);
+    writeDataToTS(0x33, 0x42);
+
+    // Recalibration if touch detected for more than 8 seconds n*0.16s
+    writeDataToTS(0x0C, 50);
+
+    // Enable keys and set key groups
+    writeDataToTS(0x1C, 0x00 | 0x04);
+    writeDataToTS(0x1D, 0x00 | 0x08);
+    writeDataToTS(0x1E, 0x00 | 0x08);
+    writeDataToTS(0x1F, 0x00 | 0x08);
+    writeDataToTS(0x20, 0x00 | 0x04);
+    writeDataToTS(0x21, 0x00 | 0x08);
+    writeDataToTS(0x22, 0x00 | 0x08);
+    writeDataToTS(0x23, 0x00 | 0x08);
+    writeDataToTS(0x24, 0x00 | 0x04);
+    writeDataToTS(0x25, 0x00 | 0x04);
+    writeDataToTS(0x26, 0x00 | 0x04);
+    writeDataToTS(0x27, 0x00 | 0x04);
+
+  }
+  return temp_return;
+}
+
+__attribute__ ((weak))
+void matrix_init_user(void) {}
+
+__attribute__ ((weak))
+void matrix_scan_user(void) {}
+
+__attribute__ ((weak))
+void matrix_init_kb(void) {
+  matrix_init_user();
+}
+
+__attribute__ ((weak))
+void matrix_scan_kb(void) {
+  matrix_scan_user();
+}
+
+void matrix_init(void) {
+
+  i2c_init();
+
+  //Motor enable
+  setPinOutput(E6);
+  //Motor PWM
+  setPinOutput(D7);
+
+  //Power LED
+  setPinOutput(B7);
+  writePinHigh(B7);
+
+  //LEDs Columns
+  setPinOutput(F7);
+  setPinOutput(F6);
+  setPinOutput(F5);
+  setPinOutput(F4);
+  setPinOutput(F1);
+  setPinOutput(F0);
+
+  //LEDs Rows
+  setPinOutput(D6);
+  setPinOutput(B4);
+  setPinOutput(B5);
+  setPinOutput(B6);
+  setPinOutput(C6);
+  setPinOutput(C7);
+
+  //Capacitive Interrupt
+  setPinInput(D2);
+
+  capSetup();
+  writeDataToTS(0x06, 0x12); //Calibrate capacitive touch IC
+
+  memset(matrix, 0, MATRIX_ROWS * sizeof(matrix_row_t));
+
+  matrix_init_quantum();
+}
+
+
+uint16_t touchDetectionRoutine(void) {
+  uint16_t data;
+  uint8_t temp1, temp2;
+
+  temp1 = readDataFromTS(0x04);
+  temp2 = readDataFromTS(0x03);
+  data = temp1;
+  data = (data << 8) | temp2;
+  return data;
+
+}
+
+//Process raw capacitive data, map pins to rows and columns
+void decodeArray(uint16_t dataIn, uint8_t *column, uint8_t *row) {
+  uint8_t i1 = 20, i2 = 20;
+  for (uint8_t i = 0; i < 12; i++) {
+    if ((dataIn & 0b1) == 1) {
+      if (i1 == 20) {
+        i1 = i;
+      } else if (i2 == 20) {
+        i2 = i;
+      }
+    }
+    dataIn = dataIn >> 1;
+  }
+
+  for (uint8_t j = 0; j < 6; j++) {
+    if (SENr[j] == i1 || SENr[j] == i2) {
+      *row = j;
+    }
+    if (SENc[j] == i1 || SENc[j] == i2) {
+      *column = j;
+    }
+  }
+}
+
+void touchClearCurrentDetections(void) {
+  readDataFromTS(0x05);
+  readDataFromTS(0x02);
+  readDataFromTS(0x03);
+  readDataFromTS(0x04);
+}
+
+//Check interrupt pin
+uint8_t isTouchChangeDetected(void) {
+  return !readPin(D2);
+}
+
+uint8_t matrix_scan(void) {
+  if (isTouchChangeDetected()) {
+    uint16_t dataIn = touchDetectionRoutine();
+    if ((dataIn & 0b111100010001) > 0 && (dataIn & 0b000011101110) > 0) {
+      uint8_t column = 10, row = 10;
+      decodeArray(dataIn, &column, &row);
+      if (column != 10 && row != 10) {
+        vibrate = VIBRATE_LENGTH; //Trigger vibration
+        matrix[row] = _BV(column);
+      } else {
+        memset(matrix, 0, MATRIX_ROWS * sizeof(matrix_row_t));
+      }
+    } else {
+      memset(matrix, 0, MATRIX_ROWS * sizeof(matrix_row_t));
+    }
+    touchClearCurrentDetections();
+  }
+
+  for (uint8_t c = 0; c < 6; c++) {
+    for (uint8_t r = 0; r < 6; r++) {
+      switch (r) {
+        case 0: writePin(D6, matrix_is_on(r, c)); break;
+        case 1: writePin(B4, matrix_is_on(r, c)); break;
+        case 2: writePin(B5, matrix_is_on(r, c)); break;
+        case 3: writePin(B6, matrix_is_on(r, c)); break;
+        case 4: writePin(C6, matrix_is_on(r, c)); break;
+        case 5: writePin(C7, matrix_is_on(r, c)); break;
+      }
+
+      switch (c) {
+        case 0: writePin(F5, !matrix_is_on(r, c)); break;
+        case 1: writePin(F4, !matrix_is_on(r, c)); break;
+        case 2: writePin(F1, !matrix_is_on(r, c)); break;
+        case 3: writePin(F0, !matrix_is_on(r, c)); break;
+        case 4: writePin(F6, !matrix_is_on(r, c)); break;
+        case 5: writePin(F7, !matrix_is_on(r, c)); break;
+      }
+    }
+  }
+
+  if (vibrate == VIBRATE_LENGTH) {
+    writePinHigh(E6);
+    writePinHigh(D7);
+    vibrate--;
+  }  else if (vibrate > 0) {
+    vibrate--;
+  } else if (vibrate == 0) {
+    writePinLow(D7);
+    writePinLow(E6);
+  }
+
+  matrix_scan_quantum();
+
+  return 1;
+
+}
+
+bool matrix_is_on(uint8_t row, uint8_t col) {
+    return (matrix[row] & (1<<col));
+}
+
+matrix_row_t matrix_get_row(uint8_t row) {
+    return matrix[row];
+}
+
+void matrix_print(void) {
+    printf("\nr/c 01234567\n");
+    for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
+        printf("%X0: ", row);
+        matrix_row_t data = matrix_get_row(row);
+        for (int col = 0; col < MATRIX_COLS; col++) {
+            if (data & (1<<col))
+                printf("1");
+            else
+                printf("0");
+        }
+        printf("\n");
+    }
+}