TOF based Presence Detector
Dependencies: BLE_API X_NUCLEO_6180XA1 X_NUCLEO_IDB0XA1 mbed
Fork of BLE_HeartRate_IDB0XA1 by
Diff: bricks/blink.cpp
- Revision:
- 29:eceecbe28088
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/bricks/blink.cpp Mon Aug 20 16:43:10 2018 +0000 @@ -0,0 +1,83 @@ +// blink.cpp - send a morse pattern to LED1 +// +// Function morse() is one way for running LED1 with a blinking sequence using +// a busy wait, until the sequence is completed. +// +// morse(o," x xxx x "); send one time morse sequence, interval = 0.2 +// morse(o," x xxx x ",0.5); send one time morse sequence, interval = 0.5 +// +// Function morse(o) got the additional feature to stop an ongoing timer based +// blinking sequence. +// +// The alternative is to setup an ever repeating blink sequence via LED1 using +// function blink(), which is non waiting. +// +// blink(o," x xxx x "); repeating blink sequence, interval = 0.2 +// blink(o," x xxx x ",0.5); repeating blink sequence, interval = 0.5 +// blink(o); stops blinking sequence +// + +#include "bricks/target.h" +#include "bricks/blink.h" + +#ifndef LED_INVERTED +# define LED_ON 1 +# define LED_OFF 0 +#else +# define LED_ON 0 +# define LED_OFF 1 +#endif + + static DigitalOut led(LED1); // LED1, being used for morse sequence + static Ticker ticker; // triggers periodic callbacks + static const char *pointer = 0; // 0 means morse activity disabled + static const char *sequence = 0; // next morse sequence for repeats + + + void morse(O&o,const char *pattern, double interval) + { + pointer = 0; // disable ticker based blinking + sequence = 0; // set also empty sequence + + for (; *pattern; pattern++) + { + led = (*pattern == ' ') ? LED_OFF : LED_ON; + wait(interval); // busy waiting for interval time + } + } + +// callback for LED1 ticker controlled blinking + + static void cbBlinker(void) // blinker callback + { + if (pointer != 0) + { + if (*pointer == 0) + { + pointer = sequence; // reset pointer to followup sequence + } + + if (*pointer) + { + led = (*pointer++ == ' ') ? LED_OFF : LED_ON; + } + } + } + + void blink(O&o,const char *pattern, const char* next, double interval) + { + pointer = 0; // stop current activities + led = LED_OFF; // reset led with LED_OFF + + sequence = next; // init morse sequence + + ticker.attach(cbBlinker,interval);// next LED state after every interval + pointer = pattern; // enable callback activty + } + + void blink(O&o, const char *pattern, double interval) + { + blink(o,pattern,pattern,interval); + } + + \ No newline at end of file