Hugo Pristauz / Mbed 2 deprecated M18_LED_Switch

A nice BLE demo program which allows remote switch of an LED via GATT interface.

Dependencies:   BLE_API mbed nRF51822

Fork of BLE_Button by Bluetooth Low Energy

bricks/blinker.cpp@12:0d0ca44397dd, 2017-10-21 (annotated)

Committer:
hux
Date:
Sat Oct 21 19:55:47 2017 +0000
Revision:
12:0d0ca44397dd
A nice BLE demo program which allows to switch a LED via BLE GATT interface.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
hux 12:0d0ca44397dd 1 // blinker.cpp - send a morse pattern to LED1
hux 12:0d0ca44397dd 2 //
hux 12:0d0ca44397dd 3 // Function morse() is one way for running LED1 with a blinking sequence using
hux 12:0d0ca44397dd 4 // a busy wait, until the sequence is completed.
hux 12:0d0ca44397dd 5 //
hux 12:0d0ca44397dd 6 // Blinker b;
hux 12:0d0ca44397dd 7 // b.morse(" x xxx x "); send one time morse sequence, interval = 0.2
hux 12:0d0ca44397dd 8 // b.morse(" x xxx x ",0.5); send one time morse sequence, interval = 0.5
hux 12:0d0ca44397dd 9 //
hux 12:0d0ca44397dd 10 // Function morse(o) got the additional feature to stop an ongoing timer based
hux 12:0d0ca44397dd 11 // blinking sequence.
hux 12:0d0ca44397dd 12 //
hux 12:0d0ca44397dd 13 // The alternative is to setup an ever repeating blink sequence via LED1 using
hux 12:0d0ca44397dd 14 // function blink(), which is non waiting.
hux 12:0d0ca44397dd 15 //
hux 12:0d0ca44397dd 16 // Blinker b;
hux 12:0d0ca44397dd 17 // b.blink(" x xxx x "); repeating blink sequence, interval = 0.2
hux 12:0d0ca44397dd 18 // b.blink(" x xxx x ",0.5); repeating blink sequence, interval = 0.5
hux 12:0d0ca44397dd 19 // b.blink(); stops blinking sequence
hux 12:0d0ca44397dd 20 //
hux 12:0d0ca44397dd 21
hux 12:0d0ca44397dd 22 #include "bricks/target.h"
hux 12:0d0ca44397dd 23 #include "bricks/blinker.h"
hux 12:0d0ca44397dd 24
hux 12:0d0ca44397dd 25 #ifndef LED_INVERTED
hux 12:0d0ca44397dd 26 # define LED_ON 1
hux 12:0d0ca44397dd 27 # define LED_OFF 0
hux 12:0d0ca44397dd 28 #else
hux 12:0d0ca44397dd 29 # define LED_ON 0
hux 12:0d0ca44397dd 30 # define LED_OFF 1
hux 12:0d0ca44397dd 31 #endif
hux 12:0d0ca44397dd 32
hux 12:0d0ca44397dd 33 #ifndef BLINK_LED
hux 12:0d0ca44397dd 34 # define BLINK_LED LED1
hux 12:0d0ca44397dd 35 #endif
hux 12:0d0ca44397dd 36
hux 12:0d0ca44397dd 37 static DigitalOut led(BLINK_LED); // being used for morse sequence
hux 12:0d0ca44397dd 38 static Ticker ticker; // triggers periodic callbacks
hux 12:0d0ca44397dd 39 static const char *pointer = 0; // 0 means morse activity disabled
hux 12:0d0ca44397dd 40 static const char *sequence = 0; // next morse sequence for repeats
hux 12:0d0ca44397dd 41
hux 12:0d0ca44397dd 42 void Blinker::morse(const char *pattern, double interval)
hux 12:0d0ca44397dd 43 {
hux 12:0d0ca44397dd 44 pointer = 0; // disable ticker based blinking
hux 12:0d0ca44397dd 45 sequence = 0; // set also empty sequence
hux 12:0d0ca44397dd 46
hux 12:0d0ca44397dd 47 for (; *pattern; pattern++)
hux 12:0d0ca44397dd 48 {
hux 12:0d0ca44397dd 49 led = (*pattern == ' ') ? LED_OFF : LED_ON;
hux 12:0d0ca44397dd 50 wait(interval); // busy waiting for interval time
hux 12:0d0ca44397dd 51 }
hux 12:0d0ca44397dd 52 }
hux 12:0d0ca44397dd 53
hux 12:0d0ca44397dd 54 // callback for LED1 ticker controlled blinking
hux 12:0d0ca44397dd 55
hux 12:0d0ca44397dd 56 static void cbBlinker(void) // blinker callback
hux 12:0d0ca44397dd 57 {
hux 12:0d0ca44397dd 58 if (pointer != 0)
hux 12:0d0ca44397dd 59 {
hux 12:0d0ca44397dd 60 if (*pointer == 0)
hux 12:0d0ca44397dd 61 {
hux 12:0d0ca44397dd 62 pointer = sequence; // reset pointer to followup sequence
hux 12:0d0ca44397dd 63 }
hux 12:0d0ca44397dd 64
hux 12:0d0ca44397dd 65 if (*pointer)
hux 12:0d0ca44397dd 66 {
hux 12:0d0ca44397dd 67 led = (*pointer++ == ' ') ? LED_OFF : LED_ON;
hux 12:0d0ca44397dd 68 }
hux 12:0d0ca44397dd 69 }
hux 12:0d0ca44397dd 70 }
hux 12:0d0ca44397dd 71
hux 12:0d0ca44397dd 72 void Blinker::blink(const char *pattern, const char* next, double interval)
hux 12:0d0ca44397dd 73 {
hux 12:0d0ca44397dd 74 pointer = 0; // stop current activities
hux 12:0d0ca44397dd 75 led = LED_OFF; // reset led with LED_OFF
hux 12:0d0ca44397dd 76
hux 12:0d0ca44397dd 77 sequence = next; // init morse sequence
hux 12:0d0ca44397dd 78
hux 12:0d0ca44397dd 79 ticker.attach(cbBlinker,interval);// next LED state after every interval
hux 12:0d0ca44397dd 80 pointer = pattern; // enable callback activty
hux 12:0d0ca44397dd 81 }
hux 12:0d0ca44397dd 82
hux 12:0d0ca44397dd 83 void Blinker::blink(const char *pattern, double interval)
hux 12:0d0ca44397dd 84 {
hux 12:0d0ca44397dd 85 blink(pattern,pattern,interval);
hux 12:0d0ca44397dd 86 }
hux 12:0d0ca44397dd 87
hux 12:0d0ca44397dd 88