Merge remote-tracking branch 'upstream/master'

* upstream/master: (1239 commits)
  Update ez.c
  removes planck/rev3 temporarily
  Move hand_swap_config to ez.c, removes error for infinity
  Update Makefile
  ergodox: Update algernon's keymap to v1.9
  Added VS Code dir to .gitignore
  Support the Pegasus Hoof controller.
  [Jack & Erez] Simplifies and documents TO
  add readme
  use wait_ms instead of _delay_ms
  add messenger
  init keymap
  Add example keymap
  Adding whiskey_tango_foxtrot_capslock ergodox keymap
  Unicode map framework. Allow unicode up to 0xFFFFF using separate mapping table
  CIE 1931 dim curve
  Apply the dim curve to the RGB output
  Update the Cluecard readme files
  Tune snake and knight intervals for Cluecard
  Tunable RGB light intervals
  ...

1 files changed, 95 insertions, 0 deletions

diff --git a/tmk_core/common/avr/sleep_led.c b/tmk_core/common/avr/sleep_led.c
new file mode 100644
index 0000000000..dab3eb0f3c
--- /dev/null
+++ b/tmk_core/common/avr/sleep_led.c
@@ -0,0 +1,95 @@
+#include <stdint.h>
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <avr/pgmspace.h>
+#include "led.h"
+#include "sleep_led.h"
+
+/* Software PWM
+ *  ______           ______           __
+ * |  ON  |___OFF___|  ON  |___OFF___|   ....
+ * |<-------------->|<-------------->|<- ....
+ *     PWM period       PWM period
+ *
+ * 256              interrupts/period[resolution]
+ * 64               periods/second[frequency]
+ * 256*64           interrupts/second
+ * F_CPU/(256*64)   clocks/interrupt
+ */
+#define SLEEP_LED_TIMER_TOP F_CPU/(256*64)
+
+void sleep_led_init(void)
+{
+    /* Timer1 setup */
+    /* CTC mode */
+    TCCR1B |= _BV(WGM12);
+    /* Clock selelct: clk/1 */
+    TCCR1B |= _BV(CS10);
+    /* Set TOP value */
+    uint8_t sreg = SREG;
+    cli();
+    OCR1AH = (SLEEP_LED_TIMER_TOP>>8)&0xff;
+    OCR1AL = SLEEP_LED_TIMER_TOP&0xff;
+    SREG = sreg;
+}
+
+void sleep_led_enable(void)
+{
+    /* Enable Compare Match Interrupt */
+    TIMSK1 |= _BV(OCIE1A);
+}
+
+void sleep_led_disable(void)
+{
+    /* Disable Compare Match Interrupt */
+    TIMSK1 &= ~_BV(OCIE1A);
+}
+
+void sleep_led_toggle(void)
+{
+    /* Disable Compare Match Interrupt */
+    TIMSK1 ^= _BV(OCIE1A);
+}
+
+
+/* Breathing Sleep LED brighness(PWM On period) table
+ * (64[steps] * 4[duration]) / 64[PWM periods/s] = 4 second breath cycle
+ *
+ * http://www.wolframalpha.com/input/?i=%28sin%28+x%2F64*pi%29**8+*+255%2C+x%3D0+to+63
+ * (0..63).each {|x| p ((sin(x/64.0*PI)**8)*255).to_i }
+ */
+static const uint8_t breathing_table[64] PROGMEM = {
+0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 4, 6, 10,
+15, 23, 32, 44, 58, 74, 93, 113, 135, 157, 179, 199, 218, 233, 245, 252,
+255, 252, 245, 233, 218, 199, 179, 157, 135, 113, 93, 74, 58, 44, 32, 23,
+15, 10, 6, 4, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
+};
+
+ISR(TIMER1_COMPA_vect)
+{
+    /* Software PWM
+     * timer:1111 1111 1111 1111
+     *       \_____/\/ \_______/____  count(0-255)
+     *          \    \______________  duration of step(4)
+     *           \__________________  index of step table(0-63)
+     */
+    static union {
+        uint16_t row;
+        struct {
+            uint8_t count:8;
+            uint8_t duration:2;
+            uint8_t index:6;
+        } pwm;
+    } timer = { .row = 0 };
+
+    timer.row++;
+    
+    // LED on
+    if (timer.pwm.count == 0) {
+        led_set(1<<USB_LED_CAPS_LOCK);
+    }
+    // LED off
+    if (timer.pwm.count == pgm_read_byte(&breathing_table[timer.pwm.index])) {
+        led_set(0);
+    }
+}