From 85688e5b52112c86895171d3dc8b26610480e932 Mon Sep 17 00:00:00 2001
From: Jack Humbert <jack.humb@gmail.com>
Date: Fri, 26 Oct 2018 16:19:23 -0400
Subject: add support for encoders to core

---
 quantum/encoder.c | 70 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 quantum/encoder.h | 29 +++++++++++++++++++++++
 quantum/quantum.c | 12 ++++++++++
 3 files changed, 111 insertions(+)
 create mode 100644 quantum/encoder.c
 create mode 100644 quantum/encoder.h

(limited to 'quantum')

diff --git a/quantum/encoder.c b/quantum/encoder.c
new file mode 100644
index 0000000000..6629a098b8
--- /dev/null
+++ b/quantum/encoder.c
@@ -0,0 +1,70 @@
+/*
+ * Copyright 2018 Jack Humbert <jack.humb@gmail.com>
+ *
+ * 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 "encoder.h"
+
+#ifndef ENCODER_RESOLUTION
+  #define ENCODER_RESOLUTION 4
+#endif
+
+#ifndef NUMBER_OF_ENCODERS
+  #error "Number of encoders not defined by NUMBER_OF_ENCODERS"
+#endif
+
+#if !defined(ENCODERS_PAD_A) || !defined(ENCODERS_PAD_B)
+  #error "No encoder pads defined by ENCODERS_PAD_A and ENCODERS_PAD_B"
+#endif
+
+static pin_t encoders_pad_a[NUMBER_OF_ENCODERS] = ENCODERS_PAD_A;
+static pin_t encoders_pad_b[NUMBER_OF_ENCODERS] = ENCODERS_PAD_B;
+
+static int8_t encoder_LUT[] = { 0, -1, 1, 0, 1, 0, 0, -1, -1, 0, 0, 1, 0, 1, -1, 0 };
+
+static uint8_t encoder_state[NUMBER_OF_ENCODERS] = {0};
+static int8_t encoder_value[NUMBER_OF_ENCODERS] = {0};
+
+__attribute__ ((weak))
+void encoder_update_user(int8_t index, bool clockwise) { }
+
+__attribute__ ((weak))
+void encoder_update_kb(int8_t index, bool clockwise) {
+  encoder_update_user(index, clockwise);
+}
+
+void encoder_init(void) {
+  for (int i = 0; i < NUMBER_OF_ENCODERS; i++) {
+    setPinInputHigh(encoders_pad_a[i]);
+    setPinInputHigh(encoders_pad_b[i]);
+
+    encoder_state[i] = (readPin(encoders_pad_a[i]) << 0) | (readPin(encoders_pad_b[i]) << 1);
+  }
+}
+
+void encoder_read(void) {
+  for (int i = 0; i < NUMBER_OF_ENCODERS; i++) {
+    encoder_state[i] <<= 2;
+    encoder_state[i] |= (readPin(encoders_pad_a[i]) << 0) | (readPin(encoders_pad_b[i]) << 1);
+    encoder_value[i] += encoder_LUT[encoder_state[i] & 0xF];
+    if (encoder_value[i] >= ENCODER_RESOLUTION) {
+        encoder_update_kb(i, COUNTRECLOCKWISE);
+    }
+    if (encoder_value[i] <= -ENCODER_RESOLUTION) { // direction is arbitrary here, but this clockwise
+        encoder_update_kb(i, CLOCKWISE);
+    }
+    encoder_value[i] %= ENCODER_RESOLUTION;
+  }
+}
diff --git a/quantum/encoder.h b/quantum/encoder.h
new file mode 100644
index 0000000000..2024fa303f
--- /dev/null
+++ b/quantum/encoder.h
@@ -0,0 +1,29 @@
+/*
+ * Copyright 2018 Jack Humbert <jack.humb@gmail.com>
+ *
+ * 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/>.
+ */
+
+#pragma once
+
+#include "quantum.h"
+
+#define COUNTRECLOCKWISE 0
+#define CLOCKWISE 1
+
+void encoder_init(void);
+void encoder_read(void);
+
+void encoder_update_kb(int8_t index, bool clockwise);
+void encoder_update_user(int8_t index, bool clockwise);
diff --git a/quantum/quantum.c b/quantum/quantum.c
index eed59f811e..c9bec6740b 100644
--- a/quantum/quantum.c
+++ b/quantum/quantum.c
@@ -42,6 +42,11 @@ extern backlight_config_t backlight_config;
 #include "process_midi.h"
 #endif
 
+
+#ifdef ENCODER_ENABLE
+#include "encoder.h"
+#endif
+
 #ifdef AUDIO_ENABLE
   #ifndef GOODBYE_SONG
     #define GOODBYE_SONG SONG(GOODBYE_SOUND)
@@ -957,6 +962,9 @@ void matrix_init_quantum() {
   #ifdef RGB_MATRIX_ENABLE
     rgb_matrix_init();
   #endif
+  #ifdef ENCODER_ENABLE
+    encoder_init();
+  #endif
   matrix_init_kb();
 }
 
@@ -991,6 +999,10 @@ void matrix_scan_quantum() {
     rgb_matrix_task_counter = ((rgb_matrix_task_counter + 1) % (RGB_MATRIX_SKIP_FRAMES + 1));
   #endif
 
+  #ifdef ENCODER_ENABLE
+    encoder_read();
+  #endif
+
   matrix_scan_kb();
 }
 #if defined(BACKLIGHT_ENABLE) && defined(BACKLIGHT_PIN)
-- 
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