napoleon leoni
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
Revision 2:aca93337a0e1, committed 2014-02-17
- Comitter:
- nleoni
- Date:
- Mon Feb 17 06:35:57 2014 +0000
- Parent:
- 1:d5bb7a2e46c2
- Commit message:
- Test for PinDetect Library; use "#define DIRECTINT" constant to compile two versions which show how the library works vs the actual InterruptIn library.
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/C12832_lcd.lib Mon Feb 17 06:35:57 2014 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/dreschpe/code/C12832_lcd/#468cdccff7af
--- a/main.cpp Sat Feb 15 07:24:47 2014 +0000
+++ b/main.cpp Mon Feb 17 06:35:57 2014 +0000
@@ -1,14 +1,94 @@
#include "mbed.h"
#include "PinDetect.h"
-// must import Cookbook PinDetct library into project
-// URL: http://mbed.org/users/AjK/libraries/PinDetect/lkyxpw
+#include "C12832_lcd.h"
+
+//Napoleon Leoni
+//***************************************************************************//
+//Test program for debounce on interrupt. Here I test the PinDetect Library //
+//To check whether indeed the library is attaching the debounced pin to an //
+//interrupt. The conclusion as shown below is that it is NOT!, the PinDetect //
+//has some nice features like key_pressed or key_pressedheld detection //
+//but they are all working on polling the specified debounced pin on a Timer //
+//interrupt, which by default is set every 20 ms. This is not the same as //
+//trigering an Interrupt on a leading or trailing edge of GPIO pin //
+//
+//
+// TESTS RUN //
+// I print to the LCD three important LPC1768 registers:
+// ISER0..Interrupt set Enable register(address 0xE000E100), for this program
+// the important bits are #4..Timer 3 interrupt and #21 External interrupt 3.
+// Note that all GPIO interrupts are attached to the External Interrupt 3
+// hardware EINT3. contents of ISER0 are accesible via: *(NVIC->ISER)
+//
+// IntEnR..GPIO interrupt enable on rising, shows which pins are attached to EINT3
+// on their rising edge (these are only for mbed pins mapped to LPC pins on Port 0)
+// its contents are available using th macro LPC_GPIOINT->IO0IntEnR
+// IntEnF..GPIO interrupt enable on falling, shows which pins are attached to EINT3
+// on their falling edge (these are only for mbed pins mapped to LPC pins on Port 0)
+// its contents are available using th macro LPC_GPIOINT->IO0IntEnF
+//
+// Note the mapping below of MBED pins to the IntEnR/IntEnF bits:
+// IntEnR/IntEnF bit LPC GPIO MBED GPIO PIN
+// 0 P[0].0 p9
+// 1 P[0].1 p10
+// 4 P[0].4 p30
+// 5 P[0].5 p29
+// 6 P[0].6 p8
+// 7 P[0].7 p7
+// 8 P[0].8 p6
+// 9 P[0].9 p5
+// 10 P[0].10 p28
+// 11 P[0].11 p27
+// 12 P[0].12 p27
+// 15 P[0].15 p13
+// 16 P[0].16 p14
+// 17 P[0].17 p12
+// 18 P[0].18 p11
+// 23 P[0].23 p15
+// 24 P[0].24 p16
+// 25 P[0].25 p17
+// 26 P[0].26 p18
+// 30 P[0].30 p19
+// 31 P[0].31 p20
+//***********************************************************************************
+// Test description Resulting Register Values Analysis
+// 1 DIRECTINT not defined ISER0 0x0000 0010 No GPIO interrupts enabled nor attached
+// so only pinDetect(14) IO0IntEnR 0x0000 0000 only TIMER 3 Interrupt enabled so the pinDetect
+// is used IO0IntEnF 0x0000 0000 libary is simply polling the pin on a timer interrupt and
+// debouncing it.
+//
+// 2 DIRECTINT defined ISER0 0x0020 0010(when enabled) GPIO interrupt is enabled and disabled periodically
+// 0x0000 0010(when disabled) when disabled the joystick up/down motion does not trigger
+// so we define InterruptIn IO0IntEnR 0x0080 0000 LED1 as expected, however the pindetect functionality continues
+// on pins 12 and 15 IO0IntEnF 0x0002 0000 to work a further confirmation that the library is not working with
+// an interrupt on the GPIO specified pin. Note that p15 is attached to
+// a rising edge GPIO interrupt and p12 to a falling edge interrupt.
+//***********************************************************************************
+
+#define DIRECTINT //constant to compare interrupt registers when using pindetect vs. using InterrupIn library
DigitalOut myled(LED1);
DigitalOut myled2(LED2);
DigitalOut myled3(LED3);
DigitalOut myled4(LED4);
+C12832_LCD lcd;
-PinDetect pb(p14); // center of joystick
+#ifdef DIRECTINT
+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
+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
+#endif
+
+
+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
+
+void ISR1() { //interrupt service routine used to turn on LED 1 on rising edge of joystick up
+ myled = 1;
+}
+
+void ISR2() { //interrupt service routing used to turn off LED 1 on falling
+ myled = 0;
+}
+
// SPST Pushbutton debounced count demo using interrupts and callback
// no external PullUp resistor needed
// Pushbutton from P8 to GND.
@@ -25,8 +105,13 @@
myled3 = (count & 0x02)>>1;
myled2 = (count & 0x04)>>2;
}
-int main() {
+int main()
+{
+#ifdef DIRECTINT
+ fire.rise(&ISR1);
+ down.fall(&ISR2);
+#endif
// Use internal pullup for pushbutton
//pb.mode(PullUp); // don't do this for app board
// Delay for initial pullup to take effect
@@ -38,9 +123,29 @@
//Blink myled in main routine forever while responding to pb changes
// via interrupts that activate the callback counter function
+ bool disableInterrupt=false;
+ int counter=0,tdelay=10;
while (1) {
- myled = !myled;
- wait(.5);
+ wait(1);
+ lcd.cls();
+ lcd.locate(0,1);
+ lcd.printf("ISER0=%#010X",*(NVIC->ISER)); //NVIC->ISER holds the address of the ISER0 register
+ lcd.locate(0,10);
+ lcd.printf("IO0 INTEN R=%#010X",LPC_GPIOINT->IO0IntEnR); //This address holds GPIO interrupt attach on rise edge state.
+ lcd.locate(0,20);
+ lcd.printf("IO0 INTEN F=%#010X",LPC_GPIOINT->IO0IntEnF ); //This address holds GPIO interrupt attach on falling edge state
+
+#ifdef DIRECTINT
+ //This section of coe periodically (every 10 seconds) toggles the external interrupt 3 EINT3
+ //state between enabled and disabled. This is the hardware interrupt used for th GPIO pins
+ counter++;
+ if(counter>=tdelay){
+ disableInterrupt=!disableInterrupt;
+ if(disableInterrupt) NVIC_DisableIRQ(EINT3_IRQn); //disable EINT3
+ if(!disableInterrupt) NVIC_EnableIRQ(EINT3_IRQn); //re-enable EINT3
+ counter=0;
+ }
+#endif
}
}
\ No newline at end of file
--- a/mbed.bld Sat Feb 15 07:24:47 2014 +0000 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,1 +0,0 @@ -http://mbed.org/users/mbed_official/code/mbed/builds/63bcd7ba4912
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.lib Mon Feb 17 06:35:57 2014 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/#63bcd7ba4912