steeven lee
Breath LED that turn on/off or loop the brightness smoothly.
Dependents: BreathLed-demo EPD_GDE021A1_demo mbed_esp8266_demo NUCLEO_uart_flow_control
This breathing-led uses Ticker and PWM which consumes few CPU, and most important, you can use it to tell system hang.
Just init it with a PWM pin which connected to a LED.
Diff: BreathLed.cpp
- Revision:
- 0:13c83a6b336f
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/BreathLed.cpp Mon Apr 06 11:02:16 2015 +0000
@@ -0,0 +1,81 @@
+/*
+ * BreathLed.cpp
+ *
+ * Created on: 2015/4/6
+ * Author: steeven@gmail.com
+ */
+
+#include <BreathLed/BreathLed.h>
+
+namespace steeven {
+BreathLed::BreathLed(PinName pin, float time, float hold) :
+ _pin(pin), _ticker() {
+ _pin = 0;
+ _time = time;
+ _hold = hold;
+ _mode = 0;
+ _off = 0;
+ _step = 0;
+}
+void BreathLed::hold_tick() {
+ _ticker.attach(this, &BreathLed::step_tick, _time / BREATH_STEPS);
+}
+void BreathLed::step_tick() {
+
+ if (_off) {
+ if (_step <= 0) {
+ if (_mode == 0) { //loop
+ _off = !_off;
+ if (_hold)
+ _ticker.attach(this, &BreathLed::hold_tick, _hold);
+ } else
+ _ticker.detach();
+ return;
+ } else {
+ _step--;
+ }
+ } else {
+ if (_step >= BREATH_STEPS) {
+ if (_mode == 0) { //loop
+ _off = !_off;
+ if (_hold)
+ _ticker.attach(this, &BreathLed::hold_tick, _hold);
+ } else
+ _ticker.detach();
+ return;
+ } else {
+ _step++;
+ }
+ }
+
+ _pin = (float)(1 << _step) / (1 << BREATH_STEPS);
+}
+void BreathLed::loop(float time, float hold) {
+ _time = time;
+ _hold = hold;
+ _mode = 0;
+ _ticker.attach(this, &BreathLed::step_tick, _time / BREATH_STEPS);
+}
+
+
+void BreathLed::on() {
+ _mode = 1;
+ _off = 0;
+ if (_pin < 1)
+ _ticker.attach(this, &BreathLed::step_tick, _time / BREATH_STEPS);
+ else
+ _ticker.detach();
+}
+void BreathLed::off() {
+ _mode = 2;
+ _off = 1;
+ if (_pin > 0)
+ _ticker.attach(this, &BreathLed::step_tick, _time / BREATH_STEPS);
+ else
+ _ticker.detach();
+}
+BreathLed::~BreathLed() {
+ if (!_pin != 0)
+ _pin = 0;
+}
+}// namespace steeven