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Dependencies:   BLE_API X_NUCLEO_IDB0XA1 mbed

Fork of BLE_HeartRate_IDB0XA1 by ST

bricks/blinker.cpp@28:307f58df778a, 2017-10-01 (annotated)

Committer:
hux
Date:
Sun Oct 01 12:48:58 2017 +0000
Revision:
28:307f58df778a
A blue button is always a nice toy ...

Who changed what in which revision?

UserRevisionLine numberNew contents of line
hux 28:307f58df778a 1 // blinker.cpp - send a morse pattern to LED1
hux 28:307f58df778a 2 //
hux 28:307f58df778a 3 // Function morse() is one way for running LED1 with a blinking sequence using
hux 28:307f58df778a 4 // a busy wait, until the sequence is completed.
hux 28:307f58df778a 5 //
hux 28:307f58df778a 6 // Blinker b;
hux 28:307f58df778a 7 // b.morse(" x xxx x "); send one time morse sequence, interval = 0.2
hux 28:307f58df778a 8 // b.morse(" x xxx x ",0.5); send one time morse sequence, interval = 0.5
hux 28:307f58df778a 9 //
hux 28:307f58df778a 10 // Function morse(o) got the additional feature to stop an ongoing timer based
hux 28:307f58df778a 11 // blinking sequence.
hux 28:307f58df778a 12 //
hux 28:307f58df778a 13 // The alternative is to setup an ever repeating blink sequence via LED1 using
hux 28:307f58df778a 14 // function blink(), which is non waiting.
hux 28:307f58df778a 15 //
hux 28:307f58df778a 16 // Blinker b;
hux 28:307f58df778a 17 // b.blink(" x xxx x "); repeating blink sequence, interval = 0.2
hux 28:307f58df778a 18 // b.blink(" x xxx x ",0.5); repeating blink sequence, interval = 0.5
hux 28:307f58df778a 19 // b.blink(); stops blinking sequence
hux 28:307f58df778a 20 //
hux 28:307f58df778a 21
hux 28:307f58df778a 22 #include "bricks/target.h"
hux 28:307f58df778a 23 #include "bricks/blinker.h"
hux 28:307f58df778a 24
hux 28:307f58df778a 25 #ifndef LED_INVERTED
hux 28:307f58df778a 26 # define LED_ON 1
hux 28:307f58df778a 27 # define LED_OFF 0
hux 28:307f58df778a 28 #else
hux 28:307f58df778a 29 # define LED_ON 0
hux 28:307f58df778a 30 # define LED_OFF 1
hux 28:307f58df778a 31 #endif
hux 28:307f58df778a 32
hux 28:307f58df778a 33 #ifndef BLINK_LED
hux 28:307f58df778a 34 # define BLINK_LED LED1
hux 28:307f58df778a 35 #endif
hux 28:307f58df778a 36
hux 28:307f58df778a 37 static DigitalOut led(BLINK_LED); // being used for morse sequence
hux 28:307f58df778a 38 static Ticker ticker; // triggers periodic callbacks
hux 28:307f58df778a 39 static const char *pointer = 0; // 0 means morse activity disabled
hux 28:307f58df778a 40 static const char *sequence = 0; // next morse sequence for repeats
hux 28:307f58df778a 41
hux 28:307f58df778a 42 void Blinker::morse(const char *pattern, double interval)
hux 28:307f58df778a 43 {
hux 28:307f58df778a 44 pointer = 0; // disable ticker based blinking
hux 28:307f58df778a 45 sequence = 0; // set also empty sequence
hux 28:307f58df778a 46
hux 28:307f58df778a 47 for (; *pattern; pattern++)
hux 28:307f58df778a 48 {
hux 28:307f58df778a 49 led = (*pattern == ' ') ? LED_OFF : LED_ON;
hux 28:307f58df778a 50 wait(interval); // busy waiting for interval time
hux 28:307f58df778a 51 }
hux 28:307f58df778a 52 }
hux 28:307f58df778a 53
hux 28:307f58df778a 54 // callback for LED1 ticker controlled blinking
hux 28:307f58df778a 55
hux 28:307f58df778a 56 static void cbBlinker(void) // blinker callback
hux 28:307f58df778a 57 {
hux 28:307f58df778a 58 if (pointer != 0)
hux 28:307f58df778a 59 {
hux 28:307f58df778a 60 if (*pointer == 0)
hux 28:307f58df778a 61 {
hux 28:307f58df778a 62 pointer = sequence; // reset pointer to followup sequence
hux 28:307f58df778a 63 }
hux 28:307f58df778a 64
hux 28:307f58df778a 65 if (*pointer)
hux 28:307f58df778a 66 {
hux 28:307f58df778a 67 led = (*pointer++ == ' ') ? LED_OFF : LED_ON;
hux 28:307f58df778a 68 }
hux 28:307f58df778a 69 }
hux 28:307f58df778a 70 }
hux 28:307f58df778a 71
hux 28:307f58df778a 72 void Blinker::blink(const char *pattern, const char* next, double interval)
hux 28:307f58df778a 73 {
hux 28:307f58df778a 74 pointer = 0; // stop current activities
hux 28:307f58df778a 75 led = LED_OFF; // reset led with LED_OFF
hux 28:307f58df778a 76
hux 28:307f58df778a 77 sequence = next; // init morse sequence
hux 28:307f58df778a 78
hux 28:307f58df778a 79 ticker.attach(cbBlinker,interval);// next LED state after every interval
hux 28:307f58df778a 80 pointer = pattern; // enable callback activty
hux 28:307f58df778a 81 }
hux 28:307f58df778a 82
hux 28:307f58df778a 83 void Blinker::blink(const char *pattern, double interval)
hux 28:307f58df778a 84 {
hux 28:307f58df778a 85 blink(pattern,pattern,interval);
hux 28:307f58df778a 86 }
hux 28:307f58df778a 87
hux 28:307f58df778a 88