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Debounce Code – One post To Rule all of them | HP0-207 Test Prep and test Questions

final month they asked you to ship for your debounce code. You didn’t disappoint and it’s time to share the code obtained. there have been some tenet for sending in code so in case you don’t see yours here, it probably didn’t comply with the guidelines, sorry. They additionally tried to weed out code that the use of delay loops for debounce. These are typically a poor approach to address inputs as a result of they monopolize the processor.

We desired to add upvote/downvote buttons to each set of code to provide some idea of a group consensus on code best however there’s no respectable device obtainable for varied up/down vote widgets on one wordpress web page. This outcomes in a huge code dump for anybody person to go through. in case you’ve received any ideas on the way to greater arrange this tell us: debounce@hackaday.com.

We make no ensures that this code is secure to use, or that it even works. check it carefully before the usage of for crucial projects.

be a part of us after the break for a whirlwind of code examples.

Ned’s Debounce Code

Ned despatched in a package of debounce code that screens distinctive buttons, debounces them, and detects button hold and liberate.

main.c:

/***************************************************************************************** * project: Button Code * version: V1.0 * client: ProTechNZ * Date Created: 22/07/2010 * Date Modified: 23/07/2010 * writer: Neil van Geffen * company: ProTech NZ * Micro: ATMega128 * velocity: 8MHz * Clock source: inner *****************************************************************************************/ /************************* Defines *******************************************************/ #encompass <io.h> #include <stdlib.h> #encompass <string.h> #consist of <delay.h> #encompass "NedsStandardHeader.h" #consist of "C info\buttons.h" #define BTN_UP 0x01 #define BTN_DOWN 0x02 #outline BTN_ENTER 0x04 #outline BTN_CLEAR 0x08 /************************* Structs and Enums *********************************************/ /************************* feature Prototypes *******************************************/ unsigned char TimeYet(unsigned int time); unsigned int TimeDiff(unsigned int past, unsigned int future); void USART0SendByte(unsigned char byteToSend); void USART1SendByte(unsigned char byteToSend); void USART0SendArray(unsigned char *array, unsigned char noOfBytes); void USART0SendString(unsigned char *string); void USART0SendStringF(flash unsigned char *string); /************************* international Variables***********************************************/ unsigned char tempByte; unsigned int tempWord; unsigned char pA, pB, pc, pD; unsigned char releaseCounter; volatile unsigned int isrTime; unsigned int currentTime; unsigned int timeButtons; unsigned int clearPressed; /************************* Setup Code ****************************************************/ void SetupPorts (void) PORTA = 0x00; PORTB = 0x00; PORTC = 0x00; PORTD = 0x04; // RXD1 (2) PORTE = 0x01; // RXD0 (0) PORTF = 0x00; DDRA = 0xF0; DDRB = 0xFF; DDRC = 0xFF; DDRD = 0xFF; // TXD1 (three) DDRE = 0x02; // TXD0 (1) DDRF = 0xFF; // 1mS timer void SetupTimers (void) TCCR0 = (0 << FOC0) /************************* main Code *****************************************************/ void main(void) SetupPorts(); SetupTimers(); SREG.7 = 1; whereas (1) SREG.7 = 0; // Atomic Time protecting currentTime = isrTime; SREG.7 = 1; computer &= 0x07; // retain computer to a max of seven pD &= 0x07; // hold pD to a max of seven PORTB = btnStatus.lastCount; // output number of buttons pressed to LEDs on PortB PORTC = (0x80 >> computer); // output a counter to PortC PORTD = (0x80 >> pD); // output a counter to PortD if (TimeYet(timeButtons)) // Time to run this bit of code yet timeButtons += 5; // Set the subsequent time to 5mS away (will also be any price truly) UpdateButtons(currentTime); // update the buttons if (buttons.held) = (buttons.held << four); // and output the buttons held to PortF excessive nibble clearPressed = currentTime + 20; // set the clearPressed time to 20ms (used to clear the LEDs after 20ms) change (buttons.held) BTN_DOWN:" if you desired to as well) case BTN_UP: pD++; break; case BTN_DOWN: pD--; smash; case BTN_ENTER: computer++; destroy; case BTN_CLEAR: workstation--; break; default: pB++; buttons.held = 0; // Clear the buttons held flags if (buttons.pressed) // if a button is pressed PORTF &= 0xF0; // clear the low nibble PORTF if (buttons.released) // if any buttons are released releaseCounter++; // increment the free up counter PORTF = 0x00; // clear PortF LEDs PORTA &= 0x0F; // clear the PortA excessive nibble PORTA if (TimeYet(clearPressed)) // if they should still clear the LEDs clearPressed = currentTime; // cease the time from wrapping-over PORTF = 0x00; // clear the LEDs /************************* features *****************************************************/ unsigned char TimeYet(unsigned int time) if (((time - 1) - currentTime) > 0xF000) // if the time has passed (will roll round when not serviced for 4095 counts) return 1; // the time has passed else return 0; // or else it has now not yet handed /************************* Interrupts ****************************************************/ interrupt [TIM0_COMP] void TimerZeroCompare (void) isrTime++; // maintain Time

Buttons.h:

/************************************* beginning OF LIBRARY feedback ******************************* * Library name: Neds Button Code * edition: V1.0 * Created: 22/07/10 * last Mod: 23/07/10 * CV version: 2.04.8a * author: Neil van Geffen * business: ProTechNZ * intention: read 4 buttons and return button presses, helds and releases. ************************************************************************************************/ /************************************* commonly used BUGS ********************************************** * ************************************************************************************************/ /************************************* NOTES *************************************************** * The code will decode the button presses into presses, holds and releases. * A press is a press AND liberate earlier than a dangle is registered * A dangle is a press held long ample to register as a dangle. * A hold will automatically repeat itself at an increasing cost ************************************************************************************************/ #outline BUTTONS (PINA & 0x0F) // Make the buttons the lower nibble lively excessive (use ~ to get lively low buttons to appear as energetic high) #outline REPEAT_MAX 250 // The start price of repeat debouncing when first pressing a button #outline REPEAT_MIN 25 // the bottom cost of repeat debouncing when first retaining a button #define SPEED_SHIFT three // The repeat value decreases through the existing repeat cost >> with the aid of this value (aka four potential it decreases via 1/16th each time) #outline DEBOUNCE_PRESS 25 // The debounce for a single press #outline DEBOUNCE_HOLD 600 // The debounce for a button cling struct unsigned int pressed:4; // holds which buttons had been pressed and released unsigned int held:4; // holds which buttons were held for more than DEBOUNCE_HOLD unsigned int launched:4; // holds which buttons had been launched after a button was held buttons; #pragma used+ /***** UpdateButtons * study four buttons (defined as BUTTONS above) * and store them to the buttons struct. * most reliable if called on a regulat foundation like every 10mS. * Calling extra often will provide more desirable resolution on button presses. ---------- * @param - curretTime, the latest time to evaluate the last press too to calculate debounce and press held length *****/ void UpdateButtons(unsigned int currentTime); #pragma used- #consist of "buttons.c"

Buttons.c:

/************************************* birth OF LIBRARY comments ******************************* * Library identify: Neds Button Code * edition: V1.0 * Created: 22/07/10 * closing Mod: 23/07/10 * CV version: 2.04.8a * creator: Neil van Geffen * business: ProTechNZ * goal: study four buttons and return button presses, helds and releases. ************************************************************************************************/ /************************************* general BUGS ********************************************** * ************************************************************************************************/ /************************************* NOTES *************************************************** * ************************************************************************************************/ #outline BUTTON_COUNT ((BUTTONS && (BUTTONS & (1 << 0))) + (BUTTONS && (BUTTONS & (1 << 1))) + (BUTTONS && (BUTTONS & (1 << 2))) + (BUTTONS && (BUTTONS & (1 << three)))) #warning with the aid of compiling Neds button code, you well known he's the man! struct unsigned char heldFlag:1; // used by means of neds code, in no way change unsigned char decreaseFlag:1; // used with the aid of neds code, not ever trade unsigned char lastStatus:4; // used by way of neds code, certainly not exchange. The closing valid combination of buttons pressed unsigned char lastCount:4; // used by using neds code, under no circumstances alternate. The number of buttons held at one time unsigned int time; // used via neds code, in no way trade. The time the button press was modified unsigned int repeat; // used by way of neds code, in no way exchange. The time between button held repeats btnStatus; unsigned int TimeDiff(unsigned int previous, unsigned int future) if (((future - 1) - past) > 0xF000) return 0; else return future - past; void UpdateButtons(unsigned int currentTime) if (TimeDiff(btnStatus.time, currentTime) >= DEBOUNCE_HOLD) // If a button has been held if (btnStatus.decreaseFlag) // if the button count number was lowered previous but they have remained the same for the size of a dangle time btnStatus.decreaseFlag = FALSE; // clear the flag that states it became lowered btnStatus.lastStatus = BUTTONS; // and set the button reputation to the at the moment pressed buttons buttons.held = btnStatus.lastStatus; // Set what buttons have been held btnStatus.time += btnStatus.repeat; // and set the time to repeat the subsequent press btnStatus.repeat = MAX(REPEAT_MIN, btnStatus.repeat - MAX(1,(btnStatus.repeat >> SPEED_SHIFT))); // and reduce the repeat cost to enhance the button held repeat price btnStatus.heldFlag = genuine; // and set the flag that states a button became held if (!BUTTONS) if (btnStatus.heldFlag) // If the buttons have been previously held btnStatus.heldFlag = FALSE; // Clear the flag so it doesnt set buttons pressed continously buttons.released = btnStatus.lastStatus; // Set what buttons had been pressed prior to now else if (TimeDiff(btnStatus.time, currentTime) >= DEBOUNCE_PRESS) // but when the buttons werent held, but pressed for long adequate to pass as a debounce buttons.pressed = btnStatus.lastStatus; // Set what buttons have been pressed btnStatus.lastCount = 0; // Clear the last count btnStatus.lastStatus = 0; // Clear the last reputation btnStatus.time = currentTime; // clear the final press time else if (BUTTON_COUNT > btnStatus.lastCount) // if the variety of buttons pressed has modified btnStatus.lastCount = BUTTON_COUNT; // save it for subsequent time. btnStatus.lastStatus = BUTTONS; // and retailer what buttons had been pressed. btnStatus.decreaseFlag = FALSE; // clear the flag that says the button presses simply diminished. btnStatus.time = currentTime; // reset the time of closing button presses. btnStatus.repeat = REPEAT_MAX; // and reset the time between held repeats. else if (BUTTON_COUNT && (BUTTON_COUNT < btnStatus.lastCount)) // Or if the button count deceased however a button continues to be pressed btnStatus.lastCount = BUTTON_COUNT; // keep the count for next time btnStatus.decreaseFlag = genuine; // set the flag to claim this came about btnStatus.time = currentTime; // reset the time of closing button presses. btnStatus.repeat = REPEAT_MAX; // and reset the time between held repeats. else if (!btnStatus.decreaseFlag && (BUTTONS != btnStatus.lastStatus)) // If someone changed button presses but not the count btnStatus.lastCount = 0; // drive the count number to exchange next time around so the code to set instances and so forth isnt in 2 places. // here is a fairly useless bit of code if the provider time is less than 10mS and besides the fact that its more, it won't be all that usefull. S1axter’s Debounce Code

Developed for PIC24 chips, this code again and again calls a characteristic to verify a pin state.

pin_io.h:

////////////////////////////////////////////////////////////////////////////////////////////////////// // // Pin I/O manage module - Header // // Language: Microchip C30 // // File: pin_io.h // author: MyBitBox.com/Geeksinside.com // Created: 08/23/09 // ////////////////////////////////////////////////////////////////////////////////////////////////////// #ifndef __PIN_IO_H__ #outline __PIN_IO_H__ void pin_io_init(void); void pin_input_check(void); #endif

pin_io.c:

////////////////////////////////////////////////////////////////////////////////////////////////////// // // Pin I/O handle module // // Language: Microchip C30 // // File: pin_io.c // creator: MyBitBox.com/Geeksinside.com // Created: 08/23/09 // ////////////////////////////////////////////////////////////////////////////////////////////////////// typedef struct uint16 masks; uint16 last_state; uint8 changed; pin_check_struct; pin_check_struct inputA, inputB; //==================================================================================== // deploy the pins //==================================================================================== void pin_io_init(void) inputA.changed = FALSE; inputA.last_state = FALSE; inputA.mask = BMASK(2); // examine PORTB2 inputB.changed = FALSE; inputB.last_state = FALSE; inputB.masks = BMASK(four); // look at PORTB4 return; //==================================================================================== // this is the debounce routine. When this is called it assessments for consistant pin states //==================================================================================== void pin_input_check(void) uint16 portb_snapshot = PORTB; // this is for the XXXXX input // ------------------------------------------------------ if(inputA.modified == real) if(!((portb_snapshot ^ inputA.last_state)&inputA.masks)) // If the line become changed remaining time, and it is a similar state as final // time, then they should lock it in here (If the bits don't seem to be the identical then this pursuits // may be called again and the appropriate cost could be locked in) if(portb_snapshot & inputA.masks) // try this when the road goes high SYS_STATUS.FLAG_XXXXX_LINE = authentic; else // do that when the line goes low SYS_STATUS.FLAG_XXXXX_LINE = FALSE; // Clear the changed flag inputA.changed = FALSE; // masks out any modified input pins inputA.modified = ((inputA.last_state ^ (portb_snapshot & inputA.masks))>0); // XOR with last last_state to locate modified pins inputA.last_state = portb_snapshot & inputA.masks; // here is for the YYYYY input // ------------------------------------------------------ if(inputB.changed == proper) if(!((portb_snapshot ^ inputB.last_state)&inputB.masks)) // If the line turned into modified remaining time, and it is the same state as final // time, then they need to lock it in here (If the bits are not the equal then this movements // can be referred to as again and the correct cost might be locked in) if(portb_snapshot & inputB.masks) // try this when the road goes high SYS_STATUS.FLAG_YYYYY_LINE = real; else // do this when the road goes low SYS_STATUS.FLAG_YYYYY_LINE = FALSE; // Clear the modified flag inputB.changed = FALSE; // masks out any changed enter pins inputB.changed = ((inputB.last_state ^ (portb_snapshot & inputB.masks))>0); // XOR with ultimate last_state to discover modified pins inputB.last_state = portb_snapshot & inputB.mask; return; //end Aaron Keith’s Debounce Code

This code is adapted for an 8051 processor.

Button_debounce_8051.c:

/*-------------------------------------------------------------------------- 10/14/2010: Button debounce code via Aaron Keith This code detects and debounces button presses. It is customized to be used with 8051 micro controllers. Complied on the trip fifty one Complier The interrupt provider routine (ISR) runs 3600 instances per 2nd. If the button is pressed (the pin is related to GND) Key_Hit is incremented to the maximum 255. When the button is launched Key_Hit will decremented to 0. Long_Key_Hit will increment more slowly and is used to realize the button being help down. --------------------------------------------------------------------------*/ #encompass<reg51.h> #outline genuine 1 #outline FALSE 0 //outline pins used by buttons at 0x97 sbit P1_7 ; #outline BUTTON P1_7 //Button on Port 1.7 //De start variables unsigned char Key_Hit; unsigned char Long_Key_Hit; /*-------------------------------------------------------------------------- Prototypes --------------------------------------------------------------------------*/ void init_timers(void); /*-------------------------------------------------------------------------- FUNC: - sets and begins a device timer PARAMS: NONE RETURNS: NONE --------------------------------------------------------------------------*/ void init_timers(void) // the use of a 11.0592 Mhz Clock TMOD = 0x02; //T0 mode 2 8 bit reload // Timer 0 is device tick TH0 = 0x00; // Reload = 256, giving 921600/256=3600 TL0 = 0x00; ET0 = genuine; // allow interrupt on timer 0 TR0 = real; // delivery timer 0; EA = real; /*-------------------------------------------------------------------------- FUNC: - main --------------------------------------------------------------------------*/ void leading(void) init_timers(); //start the timer for (;;) //loop continuously if (Key_Hit == 0xff) //Key press detected. Do whatever thing here if (Key_Hit == 0x00) //Key release detected. Do whatever thing here if (Long_Key_Hit == 0xff) //Key press and help down. Do whatever here /*-------------------------------------------------------------------------- INTERRUPT: // The procedure runs 3600 instances per 2nd --------------------------------------------------------------------------*/ void Timer0_interrupt(void) interrupt 1 static unsigned char Div18Counter = 0; if (BUTTON) // Button up (Pin is connected to VCC) if (Key_Hit != 0) // Will certainly not go beneath zero Key_Hit--; else // Button down (Pin is linked to GND) if (Key_Hit != 0xff) // Will under no circumstances go above 255 Key_Hit++; if (++Div18Counter >= 18) // run ever 5 mSec Div18Counter = 0; if (Key_Hit == 0xff) if (Long_Key_Hit != 0xff) Long_Key_Hit++; else if (Key_Hit == 0x00) // No extend when detecting key free up. Long_Key_Hit = 0x00; Thomas Flayols’ Debounce Code

This code creates a software-primarily based low-flow filter by taking a moving usual of the pin price.

// hello, to prevent contact start, my solution is to create utility low flow filter through the use of a relocating typical...(no delay solution) see the jpg to see what's take place // enter is the button input pin(0if now not pressed, 1 if pressed) main(void) unsigned char button = 0; whereas(1) // your code here... button=(button * 9+input * 10)/10; // do a moving common of the digital input... effect button between 0 and 10 if (button > 5) //the button is ON else //the button is OFF Ganesh Krishna’s Debounce Code

may also be scaled to any variety of buttons, demo fee is configurable, and this goals to make use of as little RAM as viable

dbounce.c:

#include <htc.h> /* Scalable application debounce for buttons * * this is short implementation of utility debounce with as little RAM as possible. * stress is given to scalability of number of buttons * and scalability of variety of samples per debounce cycle. * * while this file is written for PIC Microcontroller and hi-tech compiler, * the debounce characteristic itself is simply C, and never hardware dependant. * * Use the capabilities at your own chance * author: ganesh.ksm@gmail.com * * assume BSD like license. * well known with an email if it really works for you. * */ /*variety of buttons in the equipment*/ #outline MAX_BUTTONS 4 /* MAJORITY_VOTE number of samples for which the button must continue to be in pressed state * to trust that the button is pressed. * */ #define MAJORITY_VOTE 5 /* STABILITY_BITS is the number of remaining samples (ultimate few samples at the conclusion of debounce) * after which they agree with the enter stable * */ #outline STABILITY_BITS 2 /* Convert stability bits to a little masks, i.e STABILITY_MASK has STABILITY_BITS bits set in its LSB * */ #define STABILITY_MASK ((1<<STABILITY_BITS) - 1) /*This variable includes the debounced popularity of all buttons at any element of time */ unstable unsigned int debounced_buttons; /* Reads port pins and returns 1 if button is energetic (assumed energetic low) * returns 0 if inactive. Microchip PIC18 certain. * */ unsigned char Read_Portbit(int button) switch(button) case 0: return !RA0; case 1: return !RA1; case 2: return !RA2; case 3: return !RA3; /* feature: button_is_pressed() * Argument: Takes the button number as argument, an index into the array of buttons. * Returns: non zero if the button of activity is pressed for majority time of polling * returns zero if now not pressed, debouncing not finished, * button bouced back to unpressed state * * Calling price: This function will return fantastic simplest after MAJORITY_VOTE is accomplished * times with same button argument for debounce of 1 button. * the place X is the number of samples per debounce, * * depends on: Read_Portbit(button) which returns 1 if the pin of button of interest is lively and zero if not. */ char button_is_pressed( unsigned char button) unsigned int bit_count=0, temp; /* button_bits[] is an array to hang the previous states of the port pin price * every point holds the previous samples of teh button examine. * They want as many aspects as there are buttons. * Make this an integer array if greater than 8 samples are needed for debounce choice. * if less samples are mandatory regulate the MAJORITY_VOTE and STABILITY_BITS to a smaller number * */ unstable static unsigned char button_bits[MAX_BUTTONS]; /* Shift the latest read button repute into the que * they should still have the latest pattern in LSB and older samples * bigger up.*/ button_bits[button]=button_bits[button]<<1 /* call at a fee about 8 instances larger than the rate at which input detection is required * genuine frequency depends upon the number of samples required per debounce. */ void Service_user_Input(void) int i; for (i=0;i<MAX_BUTTONS;i++) 0x01<<i; void leading (void) /*PIC18 selected intialization of timer interrupt*/ GIE=1; PEIE=1; TMR0IE=1; T0CON= 0X48; //16 bit timer devoid of Prescaler for interrupts TMR0L=0xFA; TMR0H=0xFF; TMR0ON=1; TRISA = 0xFF; // PORTA is enter. /*software code begins here*/ while(1) /*Do whatever usefull with debounced_buttons*/ void interrupt User_Input() TMR0L=0x00; /*now not in fact mandatory, however lets be express*/ TMR0H=0x00; TMR0ON=1; Service_user_Input(); /*you can also choose to call this in an timed characteristic in most cases thread too*/ Kenneth Kuhn’s Debounce Code

[Chad] has been the usage of a modified version of [Kenneth Kuhn’s] debounce code for a while now. Small, quick, and smartly commented, it makes use of an integrator algorithm.

debounce.c:

/****************************************************************************** debounce.c written through Kenneth A. Kuhn edition 1.00 here is an algorithm that debounces or gets rid of random or spurious transistions of a digital signal examine as an enter by means of a computer. here's mainly applicable when the enter is from a mechanical contact. An integrator is used to operate a time hysterisis so that the sign have to persistantly be in a logical state (0 or 1) to ensure that the output to changeto that state. Random transitions of the input will not affect the output except within the rare case the place statistical clustering is longer than the detailed integration time. here instance illustrates how this algorithm works. The sequencelabeled, real sign, represents the real intended sign with no noise. The sequence labeled, corrupted, has gigantic random transitions added to the precise sign. The sequence labled, integrator, represents the set of rulesintegrator which is restrained to be between 0 and three. The sequence labeled, output, best makes a transition when the integrator reaches both 0 or 3. note that the output signal lags the enter sign with the aid of the mixing time however is free of spurious transitions. precise sign 0000111111110000000111111100000000011111111110000000000111111100000 corrupted 0100111011011001000011011010001001011100101111000100010111011100010 integrator 0100123233233212100012123232101001012321212333210100010123233321010 output 0000001111111111100000001111100000000111111111110000000001111111000 I actually have been the use of this algorithm for years and i display it right here as a code fragment in C. The algorithm has been around for a long time but doesn't seemto be broadly commonly used. as soon as in a rare while it is posted in a tech be aware. It is tremendous that the algorithm uses integration as antagonistic to area good judgment (differentiation). it is the integration that makes this algorithm so robustwithin the presence of noise. ******************************************************************************/ /* right here parameters tune the algorithm to healthy the certain application. The instance numbers are for a case where a laptop samples a mechanical contact 10 instances a second and a half-2nd integration time is used to get rid of soar. notice: DEBOUNCE_TIME is in seconds and SAMPLE_FREQUENCY is in Hertz */ #outline DEBOUNCE_TIME 0.3 #define SAMPLE_FREQUENCY 10 #define highest (DEBOUNCE_TIME * SAMPLE_FREQUENCY) /* These are the variables used */ unsigned int input; /* 0 or 1 depending on the input sign */ unsigned int integrator; /* Will latitude from 0 to the targeted highest */ unsigned int output; /* Cleaned-up edition of the enter signal */ /* Step 1: update the integrator in keeping with the input sign. notice that the integrator follows the input, reducing or expanding against the limits as determined by using the input state (0 or 1). */ if (input == 0) if (integrator > 0) integrator--; else if (integrator < optimum) integrator++; /* Step 2: update the output state in accordance with the integrator. observe that the output will most effective exchange states if the integrator has reached a limit, either 0 or highest. */ if (integrator == 0) output = 0; else if (integrator >= maximum) output = 1; integrator = highest; /* protective code if integrator got corrupted */ /********************************************************* conclusion of debounce.c */ Ubi de Feo’s Debounce Code

Arduino sketch to debounce pins from an array.

#define ARRAY_SIZE 8 // array of pins to be debounced brief pinsToDebounce[]= 2,3,4,5,6,7,eight,9 ; // array of pin state int swStates[]= 0,0,0,0,0,0,0,0; // array of old pin state int swPrevStates[]= 0,0,0,0,0,0,0,0; // array to shop the real state all through debounce int swDebouncedStates[]= 0,0,0,0,0,0,0,0; // array to keep the outdated state all through debounce int swPrevDebounceStates[]=0,0,0,0,0,0,0,0; // time to debounce int debounceDelay=a hundred; // array of outdated times the pin has been checked lengthy prevTimes[]= 0,0,0,0,0,0,0,0; void setup() Serial.begin(9600); initSwitches(); void loop() readSwitches(); void initSwitches() for(int i=0;i<ARRAY_SIZE;i++) pinMode(pinsToDebounce[i],enter); void readSwitches() // Serial.print("lively swap set "); // Serial.println((int)activeSwitchSet); for(brief sw=0;sw<ARRAY_SIZE;sw++) unstable int pin=pinsToDebounce[sw]; volatile int mpPin=pin; risky int pinPosition=sw; swStates[pinPosition]=digitalRead(pin); debouncePins(); checkStateChange(); void debouncePins() volatile lengthy _millis=millis(); for(brief sw=0;sw<ARRAY_SIZE;sw++) if(swStates[sw]!=swPrevStates[sw]) prevTimes[sw]=_millis; if(_millis-prevTimes[sw]>debounceDelay) prevTimes[sw]=_millis; swDebouncedStates[sw]=swStates[sw]; /* Serial.print("button "); Serial.print(sw); Serial.print(" is "); Serial.println(swDebouncedStates[sw]); */ swPrevStates[sw]=swStates[sw]; void checkStateChange() for(brief sw=0;sw<5;sw++) if(swPrevDebounceStates[sw]!=swDebouncedStates[sw]) /* Serial.println(""); Serial.print("button "); Serial.print(sw); Serial.print(" "); Serial.println(swDebouncedStates[sw]); */ if(swDebouncedStates[sw]==1) pinActive(sw); if(swDebouncedStates[sw]==0) pinInactive(sw); swPrevDebounceStates[sw]=swDebouncedStates[sw]; void printDebStates() Serial.println("%%%%%%%%%%%%%%%%%%%%%%%%"); for(int i=0;i<ARRAY_SIZE;i++) Serial.print(swDebouncedStates[i]); Serial.print('*'); Serial.println(""); void pinActive(int _id) Serial.print("active pin "); Serial.println(pinsToDebounce[_id]); void pinInactive(int _id) Serial.print("inactive pin "); Serial.println(pinsToDebounce[_id]); Christoph Gommel’s Debounce Code

Debouncing and scanning a keyboard matrix with an STM32 ARM processor.

/* keyboard.c Used on an STM32F103 in a wireless faraway manage (C) 2010 Christoph Gommel <chg@contronix.de> Contronix GmbH, Nizzastr. 6, 01445 Radebeul, Germany Tags: matrix, keyboard, stm32, stm32f103, debounce, hackaday */ #consist of "stm32f10x.h" #consist of "keyboard.h" #consist of "fifo.h" #define KEYBOARD_GPIO (GPIOA) // Cols and rows are intentionally positioned within the appropriate order enabling the bit moving trick used. #outline COL1 (GPIO_Pin_1) #define COL2 (GPIO_Pin_2) #define COL3 (GPIO_Pin_3) #define COLS (COL1|COL2|COL3) #outline ROW1 (GPIO_Pin_4) #define ROW2 (GPIO_Pin_5) #define ROW3 (GPIO_Pin_6) #define ROW4 (GPIO_Pin_7) #outline ROW5 (GPIO_Pin_8) #define ROWS (ROW1|ROW2|ROW3|ROW4|ROW5) //#outline ROWS_B (ROW5) #outline ColNum (3) #outline RowNum (5) #define ColStart (1) #define RowStart (four) //Very constructive macro to increment and modulo in one guide #define incmod(n,m); n=((n+1)%m); // yes, they have a shift key too #define SHIFT (GPIO_Pin_0) GPIO_InitTypeDef GPIO_InitStructure; #define KeyBufferSize (20) //volatile unsigned char keypad_queue_buffer[KeyBufferSize]; static char keypad_queue_buffer[KeyBufferSize]; fifo_t keyfifo; void keyboard_init(void) //Initialize a self made fifo device fifo_init(&keyfifo, keypad_queue_buffer, KeyBufferSize); //give clock to the GPIO RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, allow); //Initialize the rows as push-pull-output GPIO_InitStructure.GPIO_Pin = ROWS; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; GPIO_Init(KEYBOARD_GPIO, &GPIO_InitStructure); //The cols ar enter with pull-up GPIO_InitStructure.GPIO_Pin = COLS risky unsigned int CurrentRow = 0; unstable unsigned int lastScan = 0; volatile unsigned int thisScan = 0; unstable unsigned int debounceCnt; risky unsigned int numberOfKeys; risky unsigned int thisScancode; risky unsigned int lastScancode; //Adapt this to you needs #outline debounceMax (10) //right here piece of code can be called each 10 ms from a systick interrupt void keyboard_scan(void) unsigned int scan; scan = ((~GPIO_ReadInputData(KEYBOARD_GPIO)) & COLS) >> ColStart; //here's the basically interesting core of my matrix scanning algorithm. //every key of the matrix is represented in one bit of a sixteen bit unsigned short ;) thisScan = (thisScan //that is it, folks ;) Dean hall’s Debounce Code

Debouncing a pin interrupt on AVR microcontrollers

/* * pattern debouncing code * * Copyright 2010 Dean corridor. * This code snippet is offered beneath the MIT license: * http://www.opensource.org/licenses/mit-license.html */ /* * The hardware is an AVR with a change linked to the INT0 enter. * The firmware makes use of: * * - AVR Libc: http://www.nongnu.org/avr-libc/ * - The AvrX microkernel: http://www.barello.internet/avrx/ * * This demo code performs debouncing on the INT0 enter. * here is the expected sequence of moves: * * - The AVR can be doing the rest (unsleeping or asleep) when the button is pressed * - The button press produces a low-going signal and bounces for a time * - The low-going sign prompts the INT0 interrupt * - The INT0 carrier pursuits: * - Disables the INT0 interrupt so bouncing doesn't trigger diverse IRQs * - places an AvrX message in the adventure queue of the inputs assignment * - The event in the queue motives the inputs_task to be scheduled, which: * - Performs the motion that the INT0 button is supposed to invoke * - begins an AvrX prolong timer to enable for the button to cease bouncing * right through this delay, other AvrX initiatives might also run. * - After the extend, the INT0 interrupt is re-enabled for the next input. * * in this design, the prolong is above all lengthy (1s) due to a very inexpensive button * and no deserve to respond to fast button presses. * * The downside of this utility design is that no different enter pursuits are * processed while a button is debounced, despite the fact their press-messages are * queued up and dealt with after the debounce length. This conduct became * acceptable for this immediate design, however may additionally not be for all instances. */ #consist of <avr/interrupt.h> #include "avrx.h" #outline DEBOUNCE_DELAY (uint16_t)(one thousand / MILLISECONDS_PER_TIC) static MessageControlBlock remote_ctrl_pressed_msg; /* faraway handle button press interrupt carrier events */ AVRX_SIGINT(INT0_vect) IntProlog(); /* Disable INT0/RemoteCtrl interrupt */ GICR &= ~_BV(INT0); AvrXIntSendMessage(&inputs_msg_queue, &remote_ctrl_pressed_msg); Epilog(); AVRX_GCC_TASKDEF(inputs_task, TASK_STACK_SIZE, three) = (_BV(INT0) Brad Basler’s Debounce Code

Debounce synchronously or asynchronously using an ISR. utilization is discussed in this thread.

debounce.h:

#ifndef __DEBOUNCE_H__ #define __DEBOUNCE_H__ #encompass <avr/interrupt.h> //Optimized for 20 millisecond duration on a 1Mhz clock #outline DBNC_TIMR0_PRESCALER _BV(CS02) #define DBNC_TIMR0_BASEVAL 178 //Defines the dimension of the debouncer handler arrays (i.e. four for a maximum of four) #define DBNC_NUM_DEBOUNCERS eight //Defines the variety of timer ticks earlier than a worth is regarded reliable //this could define a maximum debounce time of approx a hundred milliseconds @ 5 //The minimal debounce time might be approx 80 milliseconds #outline DBNC_COUNTER_TOP 3 #define _BITSHIFTBY(bit,num) ((bit)<<(num)) typedef void(*debounceHandler)(uint8_t,uint8_t); typedef struct //A pointer to a risky port (I/O or in any other case) risky uint8_t *port; //A pointer to a debounceHandler function debounceHandler handler; //this is the decremental counter which determines //if the button has been debounced uint8_t counter; /* Bits 0-three: bit index to determine in opposition t (0-7) Bits four-5: unused Bit 5: last well-known sate Bit 6: Signaled Bit 7: Asynchronous */ uint8_t bitmap; DBNC_ITEM; typedef struct //An array of debouncer contraptions DBNC_ITEM dbUnits[DBNC_NUM_DEBOUNCERS]; //here is set to 1 when any sign within the dbncSignaled array has been set uint8_t signalReady; DBNC_GLOBAL; /* ahead Declarations */ //ISR for timer0 overflow interrupt ISR(TIMER0_OVF_vect); void callSignaledHandlers(void); void registerDebouncer(unstable uint8_t *port,uint8_t bit,uint8_t index,uint8_t Asynchronous,debounceHandler handler); void signalChangedState(uint8_t index,uint8_t counterTop); void initializeDebouncerTimer(); #endif

debounce.c:

#encompass <avr/io.h> #encompass <avr/interrupt.h> #encompass <util/delay.h> #encompass "debounce.h" volatile DBNC_GLOBAL db; //ISR for timer0 overflow interrupt ISR(TIMER0_OVF_vect) uint8_t i; uint8_t temp; uint8_t workDone = 0; //Cycle via all debounced gadgets for (i=0;i<DBNC_NUM_DEBOUNCERS;i++) //pass gadgets that have been idle if (db.dbUnits[i].counter == 0) continue; workDone = 1; //If debounce duration has elapsed if (--db.dbUnits[i].counter == 0) //grab present logical bit state of the port (1 or 0) temp = (((*(db.dbUnits[i].port)) & _BV((db.dbUnits[i].bitmap & 0b111))) != 0); //If latest state != ultimate state //keep exchange if (temp != ((db.dbUnits[i].bitmap & _BV(5)) >> 5)) //Flip final state bit db.dbUnits[i].bitmap ^= _BV(5); //If this debouncer merchandise is synchronous //Then sign it if (!(db.dbUnits[i].bitmap & _BV(7))) //signal this debouncer merchandise db.dbUnits[i].bitmap //in any other case it be asynchronous, //call immediately else //call Handler (*db.dbUnits[i].handler)(i,temp); //If all counters were already 0, disable the timer if (!workDone) TCCR0B = 0; TCNT0 = DBNC_TIMR0_BASEVAL; //name any signaled handlers (to be completed in leading software loop) void callSignaledHandlers(void) int i; if (!db.signalReady) return; for (i=0;i<DBNC_NUM_DEBOUNCERS;i++) //determine if this item is signaled if (db.dbUnits[i].bitmap & _BV(6)) //in that case, reset its sign db.dbUnits[i].bitmap &= ~_BV(6); //name merchandise and pass on ultimate familiar state (*db.dbUnits[i].handler)(i,(db.dbUnits[i].bitmap & _BV(5))>>5); //Reset signal db.signalReady = 0; void registerDebouncer(unstable uint8_t *port,uint8_t bit,uint8_t index,uint8_t Asynchronous,debounceHandler handler) //save port pointer //shop handler pointer //Reset counter to 0 //shop bitmap of bit offset/asynchronous state //Set signaled to 0 db.dbUnits[index].port = port; db.dbUnits[index].handler = handler; db.dbUnits[index].counter = 0; db.dbUnits[index].bitmap = _BITSHIFTBY((Asynchronous != 0),7) void signalChangedState(uint8_t index,uint8_t counterTop) if (!counterTop) db.dbUnits[index].counter = DBNC_COUNTER_TOP; else db.dbUnits[index].counter = counterTop; if (!TCCR0B) TCCR0B = DBNC_TIMR0_PRESCALER; void initializeDebouncerTimer() //word: doesn't birth timer TCCR0A = 0x00; TCCR0B = 0x00; TCNT0 = DBNC_TIMR0_BASEVAL; TIMSK0 = _BV(TOIE0);

examine.c:

#encompass <avr/io.h> #include <util/prolong.h> #consist of "debounce.h" unstable uint8_t lastState; void ButtonClicker(uint8_t index,uint8_t state); /* Pin-exchange interrupt 0 Detects pin alterations on PCINT0-7 (all masked on), i.e. PB0-7 on Atmega2560 It compares these values to the remaining usual state and alerts a transformation on any pins which have changed state. */ ISR(PCINT0_vect) uint8_t temp = lastState^PINB; lastState = PINB; if ((temp & _BV(0))) signalChangedState(0,2); if ((temp & _BV(1))) signalChangedState(1,three); if ((temp & _BV(2))) signalChangedState(2,4); if ((temp & _BV(three))) signalChangedState(3,5); if ((temp & _BV(4))) signalChangedState(4,20); if ((temp & _BV(5))) signalChangedState(5,50); if ((temp & _BV(6))) signalChangedState(6,200); if ((temp & _BV(7))) signalChangedState(7,200); int leading(void) //Initialize PORTB as all inputs, no interior pull-ups DDRB = 0x00; PORTB = 0x00; //Initialize PORTD as all outputs, all excessive (LEDs off) DDRD = 0xFF; PORTD = 0xFF; //preliminary timer setup (does not birth timer) initializeDebouncerTimer(); lastState = PINB; //Fills in particulars regarding registerDebouncer(&PINB,PB0,0,1,&ButtonClicker); registerDebouncer(&PINB,PB1,1,1,&ButtonClicker); registerDebouncer(&PINB,PB2,2,1,&ButtonClicker); registerDebouncer(&PINB,PB3,three,1,&ButtonClicker); registerDebouncer(&PINB,PB4,4,0,&ButtonClicker); registerDebouncer(&PINB,PB5,5,0,&ButtonClicker); registerDebouncer(&PINB,PB6,6,0,&ButtonClicker); registerDebouncer(&PINB,PB7,7,0,&ButtonClicker); //enable pin-exchange interrupt & mask PCICR = _BV(PCIE0); PCMSK0 = 0xFF; //enable interrupts sei(); whereas(1) //this will loop via any signaled debouncer items and //call their handlers (does not follow to asynchronous) callSignaledHandlers(); _delay_ms(5); return 0; void ButtonClicker(uint8_t index,uint8_t state) if (state == 0) PORTD ^= _BV(index); William Dillon’s Debounce Code

makes use of rising and falling part detection in software to create a digital filter.

/* uint8_t doDebounce(uint8_t *state, unstable uint8_t *port, uint8_t pin) * * This characteristic implements the common sense for detecting button transitions for * arbitrary ports and bits. The return value is the debounced price the the * given pin. * * The implementation of this function is inspired with the aid of the digital filter * introduced in ECE573 at Oregon State tuition. it is diverse as a result of * i am the use of the one eight-bit variable to keep all of the state, in place of a * eight bit accumulator and eight bit flag. We're the use of the range from 0x00 -> 0x7F * and bit 7 (0x80) as the flag. * * The person of this feature have to provide a static state variable. This * value encodes the state and history of the pin Failure to retain the state * would cause erratic habits. The port can also be any of the PINn * memory-mapped input buffers. Pin need to be between 0 and seven. * * as a result of these buttons pull to floor, they will invert the which means of the perimeters * in utility, 1 = sure is a lot more herbal. */ uint8_t doDebounce(uint8_t *state, risky uint8_t *port, uint8_t pin) ((flag & 0x01) << 7); // Return best the pin state return flag; Mike Szczys’ Debounce Code

I fell in love with the Danni Debounce code early on. right here’s my retouched version of it.

/*-------------------------------------------------------------------------- 10/13/2010: Button debounce code via Mike Szczys in accordance with "danni debounce" code via Peter Dannegger: http://www.avrfreaks.web/index.Hypertext Preprocessor?name=PNphpBB2&file=viewtopic&p=189356#189356 This code detects and debounces button presses. It is tailored to be used with AVR microcontrollers but I've adapted it for different architectures easily and efficaciously. It will also be modified to use all eight bits on the identical port for as much as eight buttons. The interrupt provider hobbies (ISR) at the backside uses binary counter variables (ct0 and ct1) to assess the buttons as soon as every 10ms except 40ms has handed. If the button registeres the primary and remaining instances it reads it as a keypress. There is no functionality in this code for detecting a held button. --------------------------------------------------------------------------*/ // F_CPU used by means of debounce to calculate 10ms interrupts #outline F_CPU 1200000 #encompass <avr/io.h> #consist of <avr/interrupt.h> //outline pins used by buttons #outline KEY_DDR DDRB #outline KEY_PORT PORTB #outline KEY_PIN PINB #outline KEY0 1 //Button on PB1 #outline KEY1 2 //Button on PB2 //Debounce variables unsigned char debounce_cnt = 0; volatile unsigned char key_press; unsigned char key_state; /*-------------------------------------------------------------------------- Prototypes --------------------------------------------------------------------------*/ unsigned char get_key_press( unsigned char key_mask ); void init_timers(void); void init_io(void); /*-------------------------------------------------------------------------- FUNC: 10/13/10 - Used to study debounced button presses PARAMS: A keymask similar to the pin for the button you with to ballot RETURNS: A keymask where any excessive bits signify a button press --------------------------------------------------------------------------*/ unsigned char get_key_press( unsigned char key_mask ) cli(); // study and clear atomic ! key_mask &= key_press; // read key(s) key_press ^= key_mask; // clear key(s) sei(); // allow interrupts return key_mask; /*-------------------------------------------------------------------------- FUNC: 10/13/10 - units and starts a system timer PARAMS: NONE RETURNS: NONE --------------------------------------------------------------------------*/ void init_timers(void) cli(); // read and clear atomic ! //Timer0 for buttons TCCR0B /*-------------------------------------------------------------------------- FUNC: 10/13/10 - Initialize enter and output registers PARAMS: NONE RETURNS: NONE --------------------------------------------------------------------------*/ void init_io(void) (1<<KEY1)); //Set pins as input KEY_PORT /*-------------------------------------------------------------------------- FUNC: 10/13/10 - main --------------------------------------------------------------------------*/ int leading(void) init_timers(); //delivery the timer init_io(); //setup the buttons for (;;) //loop forever if( get_key_press( 1<<KEY0 )) //KEY0 press detected. Do anything here if (get_key_press( 1<<KEY1 )) //KEY1 press detected. Do something here //-------------------------------------------------------------------------- ISR(TIM0_OVF_vect) // interrupt each 10ms = key_state & i; // 0->1: key press detect

hyperlinks to other code

Some folks simply despatched us links to code. right here they're:

[Pieter Conradie’s] matrix scanning code.

[Hernandi F. Krammes’] debounce code for PIC.

[Dave] uses [Jack Ganssle’s] debounce code; record 2 of this web page.

[Photo credit: Jack Ganssle]


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HP0-207 Reviews by Customers

Customer Reviews help to evaluate the exam performance in real test. Here all the reviews, reputation, success stories and ripoff reports provided.

HP0-207 Reviews

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