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authortmk <nobody@nowhere>2013-03-16 23:45:11 +0900
committertmk <nobody@nowhere>2013-03-16 23:45:11 +0900
commitdb79c1160b80a8292014cc50c7f16969d64e9e07 (patch)
tree799622eaffee7b4f8e8488550d3b8144f97846e4
parent0142e20bf0012eada5ba40caaa63466bfbb095a2 (diff)
Change sleep led step table to get smooth
-rw-r--r--common/sleep_led.c29
1 files changed, 20 insertions, 9 deletions
diff --git a/common/sleep_led.c b/common/sleep_led.c
index edf68c3523..dab3eb0f3c 100644
--- a/common/sleep_led.c
+++ b/common/sleep_led.c
@@ -45,29 +45,40 @@ void sleep_led_disable(void)
TIMSK1 &= ~_BV(OCIE1A);
}
+void sleep_led_toggle(void)
+{
+ /* Disable Compare Match Interrupt */
+ TIMSK1 ^= _BV(OCIE1A);
+}
+
/* Breathing Sleep LED brighness(PWM On period) table
- * (32[steps] * 8[duration]) / 64[PWM periods/s] = 4 second breath cycle
+ * (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[32] PROGMEM = {
- 0, 0, 0, 2, 9, 21, 37, 56, 78, 127, 151, 175, 197, 216, 232, 244,
- 254, 244, 216, 197, 175, 151, 127, 78, 56, 37, 21, 9, 2, 0, 0, 0
+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(8)
- * +-------------------- index of step table(0-31)
+ * \_____/\/ \_______/____ 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:3;
- uint8_t index:5;
+ uint8_t duration:2;
+ uint8_t index:6;
} pwm;
} timer = { .row = 0 };