napoleon leoni / PinDetect_Debounce_Library_Test

Test for PinDetect library. Use constant "#define DIRECTINT" to compile two different versions of the program comparing the status registers related to the interrupt states when using the PinDetect Libraries vs the InterruptIn library.

Dependencies:   C12832_lcd PinDetect mbed

Fork of Bootcamp-Pushbutton_Debounce_Interrupt by avnish aggarwal

main.cpp@2:aca93337a0e1, 2014-02-17 (annotated)

Committer:
nleoni
Date:
Mon Feb 17 06:35:57 2014 +0000
Revision:
2:aca93337a0e1
Parent:
1:d5bb7a2e46c2 
Test for PinDetect Library; use "#define DIRECTINT" constant to compile two versions which show how the library works vs the actual InterruptIn library.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
4180_1 0:cc87c48aa43c 1 #include "mbed.h"
4180_1 0:cc87c48aa43c 2 #include "PinDetect.h"
nleoni 2:aca93337a0e1 3 #include "C12832_lcd.h"
nleoni 2:aca93337a0e1 4
nleoni 2:aca93337a0e1 5 //Napoleon Leoni
nleoni 2:aca93337a0e1 6 //***************************************************************************//
nleoni 2:aca93337a0e1 7 //Test program for debounce on interrupt. Here I test the PinDetect Library //
nleoni 2:aca93337a0e1 8 //To check whether indeed the library is attaching the debounced pin to an //
nleoni 2:aca93337a0e1 9 //interrupt. The conclusion as shown below is that it is NOT!, the PinDetect //
nleoni 2:aca93337a0e1 10 //has some nice features like key_pressed or key_pressedheld detection //
nleoni 2:aca93337a0e1 11 //but they are all working on polling the specified debounced pin on a Timer //
nleoni 2:aca93337a0e1 12 //interrupt, which by default is set every 20 ms. This is not the same as //
nleoni 2:aca93337a0e1 13 //trigering an Interrupt on a leading or trailing edge of GPIO pin //
nleoni 2:aca93337a0e1 14 //
nleoni 2:aca93337a0e1 15 //
nleoni 2:aca93337a0e1 16 // TESTS RUN //
nleoni 2:aca93337a0e1 17 // I print to the LCD three important LPC1768 registers:
nleoni 2:aca93337a0e1 18 // ISER0..Interrupt set Enable register(address 0xE000E100), for this program
nleoni 2:aca93337a0e1 19 // the important bits are #4..Timer 3 interrupt and #21 External interrupt 3.
nleoni 2:aca93337a0e1 20 // Note that all GPIO interrupts are attached to the External Interrupt 3
nleoni 2:aca93337a0e1 21 // hardware EINT3. contents of ISER0 are accesible via: *(NVIC->ISER)
nleoni 2:aca93337a0e1 22 //
nleoni 2:aca93337a0e1 23 // IntEnR..GPIO interrupt enable on rising, shows which pins are attached to EINT3
nleoni 2:aca93337a0e1 24 // on their rising edge (these are only for mbed pins mapped to LPC pins on Port 0)
nleoni 2:aca93337a0e1 25 // its contents are available using th macro LPC_GPIOINT->IO0IntEnR
nleoni 2:aca93337a0e1 26 // IntEnF..GPIO interrupt enable on falling, shows which pins are attached to EINT3
nleoni 2:aca93337a0e1 27 // on their falling edge (these are only for mbed pins mapped to LPC pins on Port 0)
nleoni 2:aca93337a0e1 28 // its contents are available using th macro LPC_GPIOINT->IO0IntEnF
nleoni 2:aca93337a0e1 29 //
nleoni 2:aca93337a0e1 30 // Note the mapping below of MBED pins to the IntEnR/IntEnF bits:
nleoni 2:aca93337a0e1 31 // IntEnR/IntEnF bit LPC GPIO MBED GPIO PIN
nleoni 2:aca93337a0e1 32 // 0 P[0].0 p9
nleoni 2:aca93337a0e1 33 // 1 P[0].1 p10
nleoni 2:aca93337a0e1 34 // 4 P[0].4 p30
nleoni 2:aca93337a0e1 35 // 5 P[0].5 p29
nleoni 2:aca93337a0e1 36 // 6 P[0].6 p8
nleoni 2:aca93337a0e1 37 // 7 P[0].7 p7
nleoni 2:aca93337a0e1 38 // 8 P[0].8 p6
nleoni 2:aca93337a0e1 39 // 9 P[0].9 p5
nleoni 2:aca93337a0e1 40 // 10 P[0].10 p28
nleoni 2:aca93337a0e1 41 // 11 P[0].11 p27
nleoni 2:aca93337a0e1 42 // 12 P[0].12 p27
nleoni 2:aca93337a0e1 43 // 15 P[0].15 p13
nleoni 2:aca93337a0e1 44 // 16 P[0].16 p14
nleoni 2:aca93337a0e1 45 // 17 P[0].17 p12
nleoni 2:aca93337a0e1 46 // 18 P[0].18 p11
nleoni 2:aca93337a0e1 47 // 23 P[0].23 p15
nleoni 2:aca93337a0e1 48 // 24 P[0].24 p16
nleoni 2:aca93337a0e1 49 // 25 P[0].25 p17
nleoni 2:aca93337a0e1 50 // 26 P[0].26 p18
nleoni 2:aca93337a0e1 51 // 30 P[0].30 p19
nleoni 2:aca93337a0e1 52 // 31 P[0].31 p20
nleoni 2:aca93337a0e1 53 //***********************************************************************************
nleoni 2:aca93337a0e1 54 // Test description Resulting Register Values Analysis
nleoni 2:aca93337a0e1 55 // 1 DIRECTINT not defined ISER0 0x0000 0010 No GPIO interrupts enabled nor attached
nleoni 2:aca93337a0e1 56 // so only pinDetect(14) IO0IntEnR 0x0000 0000 only TIMER 3 Interrupt enabled so the pinDetect
nleoni 2:aca93337a0e1 57 // is used IO0IntEnF 0x0000 0000 libary is simply polling the pin on a timer interrupt and
nleoni 2:aca93337a0e1 58 // debouncing it.
nleoni 2:aca93337a0e1 59 //
nleoni 2:aca93337a0e1 60 // 2 DIRECTINT defined ISER0 0x0020 0010(when enabled) GPIO interrupt is enabled and disabled periodically
nleoni 2:aca93337a0e1 61 // 0x0000 0010(when disabled) when disabled the joystick up/down motion does not trigger
nleoni 2:aca93337a0e1 62 // so we define InterruptIn IO0IntEnR 0x0080 0000 LED1 as expected, however the pindetect functionality continues
nleoni 2:aca93337a0e1 63 // on pins 12 and 15 IO0IntEnF 0x0002 0000 to work a further confirmation that the library is not working with
nleoni 2:aca93337a0e1 64 // an interrupt on the GPIO specified pin. Note that p15 is attached to
nleoni 2:aca93337a0e1 65 // a rising edge GPIO interrupt and p12 to a falling edge interrupt.
nleoni 2:aca93337a0e1 66 //***********************************************************************************
nleoni 2:aca93337a0e1 67
nleoni 2:aca93337a0e1 68 #define DIRECTINT //constant to compare interrupt registers when using pindetect vs. using InterrupIn library
4180_1 0:cc87c48aa43c 69
4180_1 0:cc87c48aa43c 70 DigitalOut myled(LED1);
4180_1 0:cc87c48aa43c 71 DigitalOut myled2(LED2);
4180_1 0:cc87c48aa43c 72 DigitalOut myled3(LED3);
4180_1 0:cc87c48aa43c 73 DigitalOut myled4(LED4);
nleoni 2:aca93337a0e1 74 C12832_LCD lcd;
4180_1 0:cc87c48aa43c 75
nleoni 2:aca93337a0e1 76 #ifdef DIRECTINT
nleoni 2:aca93337a0e1 77 InterruptIn down(p12); // DOWN of joystickn note that mbed p12 corresponds to lpc P0[17], should appear as 0x0002 0000 in register LPC_GPIOINT->IO0IntEnR/F
nleoni 2:aca93337a0e1 78 InterruptIn fire(p15); // up of joystickn note that mbed p15 corresponds to lpc P0[23], should appear as 0x0080 0000 in register LPC_GPIOINT->IO0IntEnR/F
nleoni 2:aca93337a0e1 79 #endif
nleoni 2:aca93337a0e1 80
nleoni 2:aca93337a0e1 81
nleoni 2:aca93337a0e1 82 PinDetect pb(p14); // center of joystickn note that mbed p14 corresponds to lpc P0[16] should appear as 0x0001 0000 in register LPC_GPIOINT->IO0IntEnR/F
nleoni 2:aca93337a0e1 83
nleoni 2:aca93337a0e1 84 void ISR1() { //interrupt service routine used to turn on LED 1 on rising edge of joystick up
nleoni 2:aca93337a0e1 85 myled = 1;
nleoni 2:aca93337a0e1 86 }
nleoni 2:aca93337a0e1 87
nleoni 2:aca93337a0e1 88 void ISR2() { //interrupt service routing used to turn off LED 1 on falling
nleoni 2:aca93337a0e1 89 myled = 0;
nleoni 2:aca93337a0e1 90 }
nleoni 2:aca93337a0e1 91
4180_1 0:cc87c48aa43c 92 // SPST Pushbutton debounced count demo using interrupts and callback
4180_1 0:cc87c48aa43c 93 // no external PullUp resistor needed
4180_1 0:cc87c48aa43c 94 // Pushbutton from P8 to GND.
4180_1 0:cc87c48aa43c 95 // A pb hit generates an interrupt and activates the callback function
4180_1 0:cc87c48aa43c 96 // after the switch is debounced
4180_1 0:cc87c48aa43c 97
4180_1 0:cc87c48aa43c 98 // Global count variable
4180_1 0:cc87c48aa43c 99 int volatile count=0;
4180_1 0:cc87c48aa43c 100
4180_1 0:cc87c48aa43c 101 // Callback routine is interrupt activated by a debounced pb hit
4180_1 0:cc87c48aa43c 102 void pb_hit_callback (void) {
4180_1 0:cc87c48aa43c 103 count++;
4180_1 0:cc87c48aa43c 104 myled4 = count & 0x01;
4180_1 0:cc87c48aa43c 105 myled3 = (count & 0x02)>>1;
4180_1 0:cc87c48aa43c 106 myled2 = (count & 0x04)>>2;
4180_1 0:cc87c48aa43c 107 }
4180_1 0:cc87c48aa43c 108
nleoni 2:aca93337a0e1 109 int main()
nleoni 2:aca93337a0e1 110 {
nleoni 2:aca93337a0e1 111 #ifdef DIRECTINT
nleoni 2:aca93337a0e1 112 fire.rise(&ISR1);
nleoni 2:aca93337a0e1 113 down.fall(&ISR2);
nleoni 2:aca93337a0e1 114 #endif
4180_1 0:cc87c48aa43c 115 // Use internal pullup for pushbutton
avnisha 1:d5bb7a2e46c2 116 //pb.mode(PullUp); // don't do this for app board
4180_1 0:cc87c48aa43c 117 // Delay for initial pullup to take effect
4180_1 0:cc87c48aa43c 118 wait(.01);
4180_1 0:cc87c48aa43c 119 // Setup Interrupt callback function for a pb hit
4180_1 0:cc87c48aa43c 120 pb.attach_deasserted(&pb_hit_callback);
4180_1 0:cc87c48aa43c 121 // Start sampling pb input using interrupts
4180_1 0:cc87c48aa43c 122 pb.setSampleFrequency();
4180_1 0:cc87c48aa43c 123
4180_1 0:cc87c48aa43c 124 //Blink myled in main routine forever while responding to pb changes
4180_1 0:cc87c48aa43c 125 // via interrupts that activate the callback counter function
nleoni 2:aca93337a0e1 126 bool disableInterrupt=false;
nleoni 2:aca93337a0e1 127 int counter=0,tdelay=10;
4180_1 0:cc87c48aa43c 128 while (1) {
nleoni 2:aca93337a0e1 129 wait(1);
nleoni 2:aca93337a0e1 130 lcd.cls();
nleoni 2:aca93337a0e1 131 lcd.locate(0,1);
nleoni 2:aca93337a0e1 132 lcd.printf("ISER0=%#010X",*(NVIC->ISER)); //NVIC->ISER holds the address of the ISER0 register
nleoni 2:aca93337a0e1 133 lcd.locate(0,10);
nleoni 2:aca93337a0e1 134 lcd.printf("IO0 INTEN R=%#010X",LPC_GPIOINT->IO0IntEnR); //This address holds GPIO interrupt attach on rise edge state.
nleoni 2:aca93337a0e1 135 lcd.locate(0,20);
nleoni 2:aca93337a0e1 136 lcd.printf("IO0 INTEN F=%#010X",LPC_GPIOINT->IO0IntEnF ); //This address holds GPIO interrupt attach on falling edge state
nleoni 2:aca93337a0e1 137
nleoni 2:aca93337a0e1 138 #ifdef DIRECTINT
nleoni 2:aca93337a0e1 139 //This section of coe periodically (every 10 seconds) toggles the external interrupt 3 EINT3
nleoni 2:aca93337a0e1 140 //state between enabled and disabled. This is the hardware interrupt used for th GPIO pins
nleoni 2:aca93337a0e1 141 counter++;
nleoni 2:aca93337a0e1 142 if(counter>=tdelay){
nleoni 2:aca93337a0e1 143 disableInterrupt=!disableInterrupt;
nleoni 2:aca93337a0e1 144 if(disableInterrupt) NVIC_DisableIRQ(EINT3_IRQn); //disable EINT3
nleoni 2:aca93337a0e1 145 if(!disableInterrupt) NVIC_EnableIRQ(EINT3_IRQn); //re-enable EINT3
nleoni 2:aca93337a0e1 146 counter=0;
nleoni 2:aca93337a0e1 147 }
nleoni 2:aca93337a0e1 148 #endif
4180_1 0:cc87c48aa43c 149 }
4180_1 0:cc87c48aa43c 150
4180_1 0:cc87c48aa43c 151 }