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.
Revision 0:13c83a6b336f, committed 2015-04-06
- Comitter:
- steeven
- Date:
- Mon Apr 06 11:02:16 2015 +0000
- Commit message:
- init release;
Changed in this revision
| BreathLed.cpp | Show annotated file Show diff for this revision Revisions of this file |
| BreathLed.h | Show annotated file Show diff for this revision Revisions of this file |
diff -r 000000000000 -r 13c83a6b336f BreathLed.cpp
--- /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
diff -r 000000000000 -r 13c83a6b336f BreathLed.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/BreathLed.h Mon Apr 06 11:02:16 2015 +0000
@@ -0,0 +1,66 @@
+/*
+ * BreathLed.h
+ *
+ * Created on: 2015/4/6
+ * Author: steeven@gmail.com
+ */
+
+#ifndef BREATHLED_H_
+#define BREATHLED_H_
+
+#include "mbed.h"
+
+#define BREATH_STEPS 24
+
+namespace steeven {
+
+/** A breath led, used for turn on/off or loop the leds slowly with PWM.
+ */
+class BreathLed {
+
+public:
+ /**
+ * Create an BreathLed
+ *
+ * @param pin LED pin with PWM support
+ * @param time Time for the brightness transition
+ * @param hold Time for holding the brightness before next transition.
+ * Effective for loop mode.
+ */
+ BreathLed(PinName pin, float time = 1, float hold = 1);
+
+ virtual ~BreathLed();
+
+ /* Group: Access Methods */
+
+ /**
+ * start loop the led
+ */
+ void loop(float time = 1, float hold = 1);
+
+ /**
+ * turn on the led
+ */
+ void on();
+
+ /**
+ * turn off the led
+ */
+ void off();
+
+
+protected:
+ PwmOut _pin;
+ int _mode; //loop, on, off
+ float _time; //time of brightness transition
+ float _hold; //time to hold in loop
+ Ticker _ticker;
+
+ int _off; //current direction
+ int _step; //current brightness
+
+ void step_tick();
+ void hold_tick();
+};
+}
+#endif /* BREATHLED_H_ */