tmk
11 years ago
1 changed files with 20 additions and 9 deletions
+ 20
- 9
common/sleep_led.c
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| @@ -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 }; | |||
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