Frederic DUFOURG / Mbed 2 deprecated Ticker_and_PWM

A first try to test how interrupt, timeout and ticker interact.

Dependencies:   mbed

main.cpp@2:87c848ac42d9, 2014-08-30 (annotated)

Committer:
fdufnews
Date:
Sat Aug 30 14:33:18 2014 +0000
Revision:
2:87c848ac42d9
Parent:
1:d07b9b4d4264 
updated comments

Who changed what in which revision?

UserRevisionLine numberNew contents of line
fdufnews 0:3789d7ce5639 1 #include "mbed.h"
fdufnews 0:3789d7ce5639 2
fdufnews 0:3789d7ce5639 3 /**
fdufnews 0:3789d7ce5639 4 * @file main.cpp
fdufnews 0:3789d7ce5639 5 * @brief main file.
fdufnews 0:3789d7ce5639 6 *
fdufnews 0:3789d7ce5639 7 * @addtogroup test
fdufnews 0:3789d7ce5639 8 * @author fdufnews
fdufnews 0:3789d7ce5639 9 * @date 23.08.2014
fdufnews 1:d07b9b4d4264 10 * @brief Main module to test led, button and ticker interaction
fdufnews 0:3789d7ce5639 11 * @note required LEDs on pin D9 and D11 in addition to that on the board
fdufnews 0:3789d7ce5639 12 * @{
fdufnews 0:3789d7ce5639 13 */
fdufnews 0:3789d7ce5639 14
fdufnews 0:3789d7ce5639 15 #define F_DELAY1 1.5
fdufnews 0:3789d7ce5639 16 #define F_DELAY2 0.25
fdufnews 0:3789d7ce5639 17
fdufnews 0:3789d7ce5639 18 void offEnd(void);
fdufnews 0:3789d7ce5639 19
fdufnews 0:3789d7ce5639 20 Timeout redOn, redOff; // 2 timeout that call each other to make some sort of programmable oscillator
fdufnews 0:3789d7ce5639 21 Ticker flipperPWM; // Ticker that ramp up and down an LED
fdufnews 0:3789d7ce5639 22 InterruptIn button1(USER_BUTTON); // button that light an LED and modify timeouts period
fdufnews 0:3789d7ce5639 23 DigitalOut led1(LED1); // The green LED onboard
fdufnews 0:3789d7ce5639 24 DigitalOut redLED(D9); // a red LED on a breadboard
fdufnews 0:3789d7ce5639 25 PwmOut orangeLED(D11); // an orange one on the breadboard
fdufnews 0:3789d7ce5639 26
fdufnews 0:3789d7ce5639 27
fdufnews 0:3789d7ce5639 28 /** Function to toggle led1
fdufnews 0:3789d7ce5639 29 evry time the button is pushed this function is called
fdufnews 0:3789d7ce5639 30 and led1 state toggled*/
fdufnews 0:3789d7ce5639 31 void toggleLed1(void){
fdufnews 0:3789d7ce5639 32 led1 = !led1;
fdufnews 0:3789d7ce5639 33 }
fdufnews 0:3789d7ce5639 34
fdufnews 0:3789d7ce5639 35 /** Function called at end of onEnd timeout, sets new timeout defined by led1 state
fdufnews 2:87c848ac42d9 36 onEnd calls offEnd which calls onEnd making an oscillator*/
fdufnews 0:3789d7ce5639 37 void onEnd(void){
fdufnews 0:3789d7ce5639 38 redLED=0; // led off
fdufnews 0:3789d7ce5639 39 float delay = led1?F_DELAY1:F_DELAY2; // sets new delay conditionned by led1 state
fdufnews 0:3789d7ce5639 40 redOff.attach(&offEnd,delay); // update delay
fdufnews 0:3789d7ce5639 41 }
fdufnews 0:3789d7ce5639 42
fdufnews 2:87c848ac42d9 43 /** Function called at end of offEnd timeout, sets new timeout defined by led1 state
fdufnews 2:87c848ac42d9 44 offEnd calls onEnd which calls offEnd making an oscillator*/
fdufnews 0:3789d7ce5639 45 void offEnd(void){
fdufnews 0:3789d7ce5639 46 redLED=1; // led on
fdufnews 0:3789d7ce5639 47 float delay = led1?F_DELAY1:F_DELAY2; // sets new delay conditionned by led1 state
fdufnews 0:3789d7ce5639 48 redOn.attach(&onEnd,delay); // update delay
fdufnews 0:3789d7ce5639 49 }
fdufnews 0:3789d7ce5639 50
fdufnews 0:3789d7ce5639 51 /** Function to manage PWM for orange LED
fdufnews 2:87c848ac42d9 52 at each new tick rampPWM is called changing PWM value ramping up and down the LED*/
fdufnews 0:3789d7ce5639 53 void rampPWM(void){
fdufnews 0:3789d7ce5639 54 static int rampDir=0;
fdufnews 0:3789d7ce5639 55
fdufnews 0:3789d7ce5639 56 float curVal = orangeLED.read(); // read current programmed PWM value
fdufnews 0:3789d7ce5639 57 if (rampDir==0){ // if ramping up
fdufnews 0:3789d7ce5639 58 curVal+=0.05; // increment current PWM value
fdufnews 0:3789d7ce5639 59 orangeLED=curVal; // sets PWM
fdufnews 0:3789d7ce5639 60 if (curVal>=1.0){ // if limit reached
fdufnews 0:3789d7ce5639 61 rampDir=1; // toggle direction
fdufnews 0:3789d7ce5639 62 }
fdufnews 0:3789d7ce5639 63 }else if (rampDir==1){ // if ramping down
fdufnews 0:3789d7ce5639 64 curVal-=0.1; // decrement current PWM value
fdufnews 0:3789d7ce5639 65 orangeLED=curVal; // sets PWM
fdufnews 0:3789d7ce5639 66 if (curVal<=0.0){ // if limit reached
fdufnews 0:3789d7ce5639 67 rampDir=0; // toggle direction
fdufnews 0:3789d7ce5639 68 }
fdufnews 0:3789d7ce5639 69 }
fdufnews 0:3789d7ce5639 70 }
fdufnews 0:3789d7ce5639 71
fdufnews 0:3789d7ce5639 72 /** main function
fdufnews 0:3789d7ce5639 73 sets system up by
fdufnews 0:3789d7ce5639 74 initializing LEDs state
fdufnews 0:3789d7ce5639 75 attaching interrupt
fdufnews 0:3789d7ce5639 76 launching ticker and timeout
fdufnews 0:3789d7ce5639 77 then enters an infinite while(1) loop
fdufnews 0:3789d7ce5639 78 */
fdufnews 0:3789d7ce5639 79 int main(void){
fdufnews 0:3789d7ce5639 80 // sets LED default state
fdufnews 0:3789d7ce5639 81 led1=0;
fdufnews 0:3789d7ce5639 82 redLED=1;
fdufnews 0:3789d7ce5639 83 orangeLED.write(0.0);
fdufnews 0:3789d7ce5639 84
fdufnews 0:3789d7ce5639 85 // attach functions called by ISR
fdufnews 0:3789d7ce5639 86 redOn.attach(&onEnd,F_DELAY1); // toggle redLED state
fdufnews 0:3789d7ce5639 87 flipperPWM.attach(&rampPWM,0.1); // change PWM value every 100ms
fdufnews 0:3789d7ce5639 88 button1.fall(&toggleLed1);
fdufnews 0:3789d7ce5639 89 while(1){}; // do nothing
fdufnews 0:3789d7ce5639 90 }
fdufnews 0:3789d7ce5639 91
fdufnews 0:3789d7ce5639 92 /** @} */