Add Word Per Minute calculation feature (#8054)

* Add Word Per Minute calculation feature

* Fix copyright info

* Remove header from quantum.c, setup overloadable keycode inclusion for WPM, update docs

* Simplify logic for keycode filtering

* Adding link from summary to wpm_feature info

* Update docs/feature_wpm.md

Typo in function prototype example in docs

Co-Authored-By: James Young <18669334+noroadsleft@users.noreply.github.com>

* Add WPM transport via i2c

Co-authored-by: James Young <18669334+noroadsleft@users.noreply.github.com>

1 files changed, 67 insertions, 0 deletions

diff --git a/quantum/wpm.c b/quantum/wpm.c
new file mode 100644
index 000000000..d4c971f31
--- /dev/null
+++ b/quantum/wpm.c
@@ -0,0 +1,67 @@
+/*
+ * Copyright 2020 Richard Sutherland (rich@brickbots.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 "wpm.h"
+
+//WPM Stuff
+static uint8_t current_wpm = 0;
+static uint8_t latest_wpm = 0;
+static uint16_t wpm_timer = 0;
+
+//This smoothing is 40 keystrokes
+static const float wpm_smoothing = 0.0487;
+
+void set_current_wpm(uint8_t new_wpm) { current_wpm = new_wpm; }
+
+uint8_t get_current_wpm(void) { return current_wpm; }
+
+bool wpm_keycode(uint16_t keycode) { return wpm_keycode_kb(keycode); }
+
+__attribute__((weak)) bool wpm_keycode_kb(uint16_t keycode) { return wpm_keycode_user(keycode); }
+
+__attribute__((weak)) bool wpm_keycode_user(uint16_t keycode) {
+
+    if ((keycode >= QK_MOD_TAP && keycode <= QK_MOD_TAP_MAX) || (keycode >= QK_LAYER_TAP && keycode <= QK_LAYER_TAP_MAX) || (keycode >= QK_MODS && keycode <= QK_MODS_MAX)) {
+        keycode = keycode & 0xFF;
+    } else if (keycode > 0xFF) {
+        keycode = 0;
+    }
+    if((keycode >= KC_A && keycode <= KC_0) || (keycode >= KC_TAB && keycode <= KC_SLASH)) {
+        return true;
+    }
+
+    return false;
+}
+
+
+void update_wpm(uint16_t keycode) {
+    if(wpm_keycode(keycode)) {
+        if(wpm_timer > 0) {
+            latest_wpm = 60000 / timer_elapsed(wpm_timer) / 5;
+            current_wpm = (latest_wpm - current_wpm) * wpm_smoothing + current_wpm;
+        }
+        wpm_timer = timer_read();
+    }
+}
+
+void decay_wpm(void) {
+  if (timer_elapsed(wpm_timer) > 1000) {
+        current_wpm = (0 - current_wpm) * wpm_smoothing +
+                current_wpm;
+        wpm_timer = timer_read();
+  }
+}