Wayne Chin
Got quadrature decoders and mode switch working
Diff: main.cpp
- Revision:
- 1:fb60f76e33ee
- Parent:
- 0:7ae28d2c1e3e
--- a/main.cpp Fri Oct 22 20:41:49 2010 +0000
+++ b/main.cpp Mon Oct 25 20:48:04 2010 +0000
@@ -4,6 +4,9 @@
// Version 0.1
// Created by Wayne Chin
// October 22, 2010
+// Version 0.2
+// Added amps/gas mode selections; confirmed quad decoder operation.
+// October 25, 2010
#include "mbed.h"
@@ -11,18 +14,25 @@
#define FALSE 0
#define ON 0 // LED drives are inverted
#define OFF 1 // LED drives are inverted
-#define MAXAMPS200 200
-#define MINAMPSET 25
-#define MAXGASPRESS 99
+#define MAXAMPS200 200 // Max amps display
+#define MINAMPSET 25 // Min amps display
+#define MAXGASPRESS 99 // Max gas display
+#define STARTGASPRESS 75
#define MINGASPRESS 0
-
-//#define AMPSMODE // ***Comment this line to compile for gas control mode***
+#define AMPSMODE 0
+#define GASMODE 1
+#define BUTTONTIMEOUT 1000 // Mode change timeout in milliseconds
// Global variables
int quadnew, quadold; // Quadrature decoding
int quadcount; // Integer counter for quadrature encoder output
+int gascount, ampscount; // Separately keep track of gas and amps
int select, gasselect; // Keep track of mode/gas selection LEDs
int quadswitchnew, quadswitchold; // Debounce pushbutton states
+int mode; // Keep track of AMPS or GAS pressure display modes
+int modechanged; // Keep track of entry into mode change
+
+Serial pc(USBTX, USBRX); // tx, rx
// mbed LEDs
DigitalOut led1(LED1);
@@ -66,20 +76,19 @@
// Interrupt
Ticker getswitches; // Periodic function call used to sample switches
+Timer modetimer; // Used for press-and-hold function
// Take integer input and drive 3 digit 7-segment display and toggle among gas select LEDs
void LEDout(int number)
{
int hundreds, tens, ones;
-#ifdef AMPSMODE
- if (number > 999) // Throw out numbers greater than 999
-#else
- if (number > 99) // Throw out numbers greater than 99
-#endif
+ if (mode == AMPSMODE && number > 999) // Throw out numbers greater than 999
+ return;
+ else if (mode == GASMODE && number > 99) // Throw out numbers greater than 99
return;
else if (number < 0) // Throw out numbers less than 0
return;
- else
+ else // Display number
{
// Extract hundreds digit
hundreds = number - (number / 100);
@@ -89,243 +98,81 @@
// Extract ones digit
ones = number - hundreds - tens;
-#ifdef AMPSMODE
- switch (hundreds)
+ if (mode == AMPSMODE)
{
- case 0:
- {
- LED1a = ON;
- LED1b = ON;
- LED1c = ON;
- LED1d = ON;
- LED1e = ON;
- LED1f = ON;
- LED1g = OFF;
- }
- break;
- case 1:
- {
- LED1a = OFF;
- LED1b = ON;
- LED1c = ON;
- LED1d = OFF;
- LED1e = OFF;
- LED1f = OFF;
- LED1g = OFF;
- }
- break;
- case 2:
- {
- LED1a = ON;
- LED1b = ON;
- LED1c = OFF;
- LED1d = ON;
- LED1e = ON;
- LED1f = OFF;
- LED1g = ON;
- }
- break;
- case 3:
- {
- LED1a = ON;
- LED1b = ON;
- LED1c = ON;
- LED1d = ON;
- LED1e = OFF;
- LED1f = OFF;
- LED1g = ON;
- }
- break;
- case 4:
- {
- LED1a = OFF;
- LED1b = ON;
- LED1c = ON;
- LED1d = OFF;
- LED1e = OFF;
- LED1f = ON;
- LED1g = ON;
- }
- break;
- case 5:
- {
- LED1a = ON;
- LED1b = OFF;
- LED1c = ON;
- LED1d = ON;
- LED1e = OFF;
- LED1f = ON;
- LED1g = ON;
- }
- break;
- case 6:
- {
- LED1a = ON;
- LED1b = OFF;
- LED1c = ON;
- LED1d = ON;
- LED1e = ON;
- LED1f = ON;
- LED1g = ON;
- }
- break;
- case 7:
- {
- LED1a = ON;
- LED1b = ON;
- LED1c = ON;
- LED1d = OFF;
- LED1e = OFF;
- LED1f = OFF;
- LED1g = OFF;
- }
- break;
- case 8:
- {
- LED1a = ON;
- LED1b = ON;
- LED1c = ON;
- LED1d = ON;
- LED1e = ON;
- LED1f = ON;
- LED1g = ON;
- }
- break;
- case 9:
- {
- LED1a = ON;
- LED1b = ON;
- LED1c = ON;
- LED1d = ON;
- LED1e = OFF;
- LED1f = ON;
- LED1g = ON;
- }
- break;
- default:
- break; // Do nothing
- } // switch (hundreds)
-#else
- // Turn off hundreds digit in gas mode
- LED1a = OFF;
- LED1b = OFF;
- LED1c = OFF;
- LED1d = OFF;
- LED1e = OFF;
- LED1f = OFF;
- LED1g = OFF;
-#endif
+ switch (hundreds)
+ {
+ case 0: {
+ LED1a = ON; LED1b = ON; LED1c = ON; LED1d = ON; LED1e = ON; LED1f = ON; LED1g = OFF; }
+ break;
+ case 1: {
+ LED1a = OFF; LED1b = ON; LED1c = ON; LED1d = OFF; LED1e = OFF; LED1f = OFF; LED1g = OFF; }
+ break;
+ case 2: {
+ LED1a = ON; LED1b = ON; LED1c = OFF; LED1d = ON; LED1e = ON; LED1f = OFF; LED1g = ON; }
+ break;
+ case 3: {
+ LED1a = ON; LED1b = ON; LED1c = ON; LED1d = ON; LED1e = OFF; LED1f = OFF; LED1g = ON; }
+ break;
+ case 4: {
+ LED1a = OFF; LED1b = ON; LED1c = ON; LED1d = OFF; LED1e = OFF; LED1f = ON; LED1g = ON; }
+ break;
+ case 5: {
+ LED1a = ON; LED1b = OFF; LED1c = ON; LED1d = ON; LED1e = OFF; LED1f = ON; LED1g = ON; }
+ break;
+ case 6: {
+ LED1a = ON; LED1b = OFF; LED1c = ON; LED1d = ON; LED1e = ON; LED1f = ON; LED1g = ON; }
+ break;
+ case 7: {
+ LED1a = ON; LED1b = ON; LED1c = ON; LED1d = OFF; LED1e = OFF; LED1f = OFF; LED1g = OFF; }
+ break;
+ case 8: {
+ LED1a = ON; LED1b = ON; LED1c = ON; LED1d = ON; LED1e = ON; LED1f = ON; LED1g = ON; }
+ break;
+ case 9: {
+ LED1a = ON; LED1b = ON; LED1c = ON; LED1d = ON; LED1e = OFF; LED1f = ON; LED1g = ON; }
+ break;
+ default:
+ break; // Do nothing
+ } // switch (hundreds)
+ }
+ else // (mode == GASMODE)
+ {
+ // Turn off hundreds digit in gas mode
+ LED1a = OFF; LED1b = OFF; LED1c = OFF; LED1d = OFF; LED1e = OFF; LED1f = OFF; LED1g = OFF;
+ }
+
switch (tens)
{
- case 0:
- {
- LED2a = ON;
- LED2b = ON;
- LED2c = ON;
- LED2d = ON;
- LED2e = ON;
- LED2f = ON;
- LED2g = OFF;
- }
+ case 0: {
+ LED2a = ON; LED2b = ON; LED2c = ON; LED2d = ON; LED2e = ON; LED2f = ON; LED2g = OFF; }
break;
- case 1:
- {
- LED2a = OFF;
- LED2b = ON;
- LED2c = ON;
- LED2d = OFF;
- LED2e = OFF;
- LED2f = OFF;
- LED2g = OFF;
- }
+ case 1: {
+ LED2a = OFF; LED2b = ON; LED2c = ON; LED2d = OFF; LED2e = OFF; LED2f = OFF; LED2g = OFF; }
break;
- case 2:
- {
- LED2a = ON;
- LED2b = ON;
- LED2c = OFF;
- LED2d = ON;
- LED2e = ON;
- LED2f = OFF;
- LED2g = ON;
- }
+ case 2: {
+ LED2a = ON; LED2b = ON; LED2c = OFF; LED2d = ON; LED2e = ON; LED2f = OFF; LED2g = ON; }
break;
- case 3:
- {
- LED2a = ON;
- LED2b = ON;
- LED2c = ON;
- LED2d = ON;
- LED2e = OFF;
- LED2f = OFF;
- LED2g = ON;
- }
+ case 3: {
+ LED2a = ON; LED2b = ON; LED2c = ON; LED2d = ON; LED2e = OFF; LED2f = OFF; LED2g = ON; }
break;
- case 4:
- {
- LED2a = OFF;
- LED2b = ON;
- LED2c = ON;
- LED2d = OFF;
- LED2e = OFF;
- LED2f = ON;
- LED2g = ON;
- }
+ case 4: {
+ LED2a = OFF; LED2b = ON; LED2c = ON; LED2d = OFF; LED2e = OFF; LED2f = ON; LED2g = ON; }
break;
- case 5:
- {
- LED2a = ON;
- LED2b = OFF;
- LED2c = ON;
- LED2d = ON;
- LED2e = OFF;
- LED2f = ON;
- LED2g = ON;
- }
+ case 5: {
+ LED2a = ON; LED2b = OFF; LED2c = ON; LED2d = ON; LED2e = OFF; LED2f = ON; LED2g = ON; }
break;
- case 6:
- {
- LED2a = ON;
- LED2b = OFF;
- LED2c = ON;
- LED2d = ON;
- LED2e = ON;
- LED2f = ON;
- LED2g = ON;
- }
+ case 6: {
+ LED2a = ON; LED2b = OFF; LED2c = ON; LED2d = ON; LED2e = ON; LED2f = ON; LED2g = ON; }
break;
- case 7:
- {
- LED2a = ON;
- LED2b = ON;
- LED2c = ON;
- LED2d = OFF;
- LED2e = OFF;
- LED2f = OFF;
- LED2g = OFF;
- }
+ case 7: {
+ LED2a = ON; LED2b = ON; LED2c = ON; LED2d = OFF; LED2e = OFF; LED2f = OFF; LED2g = OFF; }
break;
- case 8:
- {
- LED2a = ON;
- LED2b = ON;
- LED2c = ON;
- LED2d = ON;
- LED2e = ON;
- LED2f = ON;
- LED2g = ON;
- }
+ case 8: {
+ LED2a = ON; LED2b = ON; LED2c = ON; LED2d = ON; LED2e = ON; LED2f = ON; LED2g = ON; }
break;
- case 9:
- {
- LED2a = ON;
- LED2b = ON;
- LED2c = ON;
- LED2d = ON;
- LED2e = OFF;
- LED2f = ON;
- LED2g = ON;
- }
+ case 9: {
+ LED2a = ON; LED2b = ON; LED2c = ON; LED2d = ON; LED2e = OFF; LED2f = ON; LED2g = ON; }
break;
default:
break; // Do nothing
@@ -333,121 +180,40 @@
switch (ones)
{
- case 0:
- {
- LED3a = ON;
- LED3b = ON;
- LED3c = ON;
- LED3d = ON;
- LED3e = ON;
- LED3f = ON;
- LED3g = OFF;
- }
+ case 0: {
+ LED3a = ON; LED3b = ON; LED3c = ON; LED3d = ON; LED3e = ON; LED3f = ON; LED3g = OFF; }
break;
- case 1:
- {
- LED3a = OFF;
- LED3b = ON;
- LED3c = ON;
- LED3d = OFF;
- LED3e = OFF;
- LED3f = OFF;
- LED3g = OFF;
- }
+ case 1: {
+ LED3a = OFF; LED3b = ON; LED3c = ON; LED3d = OFF; LED3e = OFF; LED3f = OFF; LED3g = OFF; }
break;
- case 2:
- {
- LED3a = ON;
- LED3b = ON;
- LED3c = OFF;
- LED3d = ON;
- LED3e = ON;
- LED3f = OFF;
- LED3g = ON;
- }
+ case 2: {
+ LED3a = ON; LED3b = ON; LED3c = OFF; LED3d = ON; LED3e = ON; LED3f = OFF; LED3g = ON; }
break;
- case 3:
- {
- LED3a = ON;
- LED3b = ON;
- LED3c = ON;
- LED3d = ON;
- LED3e = OFF;
- LED3f = OFF;
- LED3g = ON;
- }
+ case 3: {
+ LED3a = ON; LED3b = ON; LED3c = ON; LED3d = ON; LED3e = OFF; LED3f = OFF; LED3g = ON; }
break;
- case 4:
- {
- LED3a = OFF;
- LED3b = ON;
- LED3c = ON;
- LED3d = OFF;
- LED3e = OFF;
- LED3f = ON;
- LED3g = ON;
- }
+ case 4: {
+ LED3a = OFF; LED3b = ON; LED3c = ON; LED3d = OFF; LED3e = OFF; LED3f = ON; LED3g = ON; }
break;
- case 5:
- {
- LED3a = ON;
- LED3b = OFF;
- LED3c = ON;
- LED3d = ON;
- LED3e = OFF;
- LED3f = ON;
- LED3g = ON;
- }
+ case 5: {
+ LED3a = ON; LED3b = OFF; LED3c = ON; LED3d = ON; LED3e = OFF; LED3f = ON; LED3g = ON; }
break;
- case 6:
- {
- LED3a = ON;
- LED3b = OFF;
- LED3c = ON;
- LED3d = ON;
- LED3e = ON;
- LED3f = ON;
- LED3g = ON;
- }
+ case 6: {
+ LED3a = ON; LED3b = OFF; LED3c = ON; LED3d = ON; LED3e = ON; LED3f = ON; LED3g = ON; }
break;
- case 7:
- {
- LED3a = ON;
- LED3b = ON;
- LED3c = ON;
- LED3d = OFF;
- LED3e = OFF;
- LED3f = OFF;
- LED3g = OFF;
- }
+ case 7: {
+ LED3a = ON; LED3b = ON; LED3c = ON; LED3d = OFF; LED3e = OFF; LED3f = OFF; LED3g = OFF; }
break;
- case 8:
- {
- LED3a = ON;
- LED3b = ON;
- LED3c = ON;
- LED3d = ON;
- LED3e = ON;
- LED3f = ON;
- LED3g = ON;
- }
+ case 8: {
+ LED3a = ON; LED3b = ON; LED3c = ON; LED3d = ON; LED3e = ON; LED3f = ON; LED3g = ON; }
break;
- case 9:
- {
- LED3a = ON;
- LED3b = ON;
- LED3c = ON;
- LED3d = ON;
- LED3e = OFF;
- LED3f = ON;
- LED3g = ON;
- }
+ case 9: {
+ LED3a = ON; LED3b = ON; LED3c = ON; LED3d = ON; LED3e = OFF; LED3f = ON; LED3g = ON; }
break;
default:
break; // Do nothing
} // switch (ones)
-
- } // if
+ } // if Display number
} // LEDout()
// Read quadrature encoder switch inputs from I/O port.
@@ -469,73 +235,61 @@
// Quadrature counter-clockwise states: 00 -> 01 -> 11 -> 10
void sampleswitches()
{
-#ifdef AMPSMODE
- led1 = !led1;
-#endif
+ int quadcountold = quadcount;
// Change gas select state only when button is depressed
quadswitchnew = quadsw;
- if (quadswitchnew == ON && quadswitchold == OFF) // Button pushed down
+ if (quadswitchnew == OFF && quadswitchold == ON) // Button pushed down, then released
{
- select++;
- if (select > 2) // Only 2 LEDs enabled for UIMockup Rev 1 board
- select = 1;
-#ifndef AMPSMODE
- gasselect++;
- if (gasselect > 4) // Use mbed LEDs
- gasselect = 1;
-#endif
+ if (modetimer.read_ms() <= BUTTONTIMEOUT)
+ {
+ if (mode == AMPSMODE)
+ {
+ select++;
+ if (select > 3) // Cycle through 2 UIMockup LEDs
+ select = 2;
+ }
+ else // (mode == GASMODE)
+ {
+ gasselect++;
+ if (gasselect > 4) // Cycle through 4 mbed LEDs
+ gasselect = 1;
+ }
+ }
+ modetimer.stop();
+ modetimer.reset();
+ quadswitchold = quadswitchnew;
+ modechanged = FALSE;
+ }
+ else if (quadswitchnew == ON && quadswitchold == ON) // Button held down
+ {
+ if (modetimer.read_ms() == 0)
+ modetimer.start();
+ else if (modetimer.read_ms() > BUTTONTIMEOUT) // Look for mode change
+ {
+ if (modechanged == FALSE)
+ {
+ if (mode == AMPSMODE)
+ {
+ mode = GASMODE;
+ pc.printf("Gas mode\n\r");
+ }
+ else
+ {
+ mode = AMPSMODE;
+ pc.printf("Amps mode\n\r");
+ }
+ modetimer.stop();
+ modechanged = TRUE;
+ }
+ }
quadswitchold = quadswitchnew;
}
- else if (quadswitchnew == ON && quadswitchold == ON) // Button held down
- ; // Do nothing, since transition happened already
+ else if (quadswitchnew == ON) // Button depressed for the first time
+ quadswitchold = quadswitchnew; // Do nothing
else if (quadswitchnew == OFF) // Button released
quadswitchold = quadswitchnew; // Do nothing
- // Update LEDs
- if (select == 1)
- {
- LEDg2 = ON;
- LEDg3 = OFF;
- }
- else // select == 2
- {
- LEDg2 = OFF;
- LEDg3 = ON;
- }
-#ifndef AMPSMODE
- // Update mbed LEDs to simulate gas selection
- if (gasselect == 1)
- {
- led1 = 1;
- led2 = 0;
- led3 = 0;
- led4 = 0;
- }
- else if (gasselect == 2)
- {
- led1 = 0;
- led2 = 1;
- led3 = 0;
- led4 = 0;
- }
- else if (gasselect == 3)
- {
- led1 = 0;
- led2 = 0;
- led3 = 1;
- led4 = 0;
- }
- else // gasselect == 4
- {
- led1 = 0;
- led2 = 0;
- led3 = 0;
- led4 = 1;
- }
-#endif
-
- // Update 7-segment display in AMPs mode
- quadold = quadnew; // Store current quad state
+ // Update 7-segment display
quadnew = getquad(); // Get new quad state
switch (quadold)
{
@@ -604,68 +358,102 @@
} // switch
break;
} // switch (quadold)
-
- #ifdef AMPSMODE
- if (quadcount > MAXAMPS200)
- quadcount = MAXAMPS200; // Clip at high end
- else if (quadcount < MINAMPSET)
- quadcount = MINAMPSET; // Clip at low end
- #else
- if (quadcount > MAXGASPRESS)
- quadcount = MAXGASPRESS; // Clip at high end
- else if (quadcount < MINGASPRESS)
- quadcount = MINGASPRESS; // Clip at low end
- #endif
-
- LEDout(quadcount);
+ quadold = quadnew; // Store current quad state
-#ifdef AMPSMODE
- led1 = !led1;
-#endif
+ if (mode == AMPSMODE)
+ {
+ ampscount += (quadcountold - quadcount);
+ if (ampscount > MAXAMPS200)
+ ampscount = MAXAMPS200; // Clip at high end
+ else if (ampscount < MINAMPSET)
+ ampscount = MINAMPSET; // Clip at low end
+ if (select == 2)
+ {
+ LEDg2 = ON; LEDg3 = OFF;
+ }
+ else // select == 3
+ {
+ LEDg2 = OFF; LEDg3 = ON;
+ }
+ switch (ampscount % 4) // Get 2 LSBs and display on mbed LEDs
+ {
+ case 0:
+ led1 = 1; led2 = 0; led3 = 0; led4 = 0;
+ break;
+ case 1:
+ led1 = 0; led2 = 1; led3 = 0; led4 = 0;
+ break;
+ case 2:
+ led1 = 0; led2 = 0; led3 = 1; led4 = 0;
+ break;
+ default:
+ led1 = 0; led2 = 0; led3 = 0; led4 = 1;
+ break;
+ } // switch
+ LEDout(ampscount);
+ //if (quadcount != quadcountold) pc.printf("%d amps\n\r", ampscount);
+ }
+ else // (mode == GASMODE)
+ {
+ gascount += (quadcountold - quadcount);
+ if (gascount > MAXGASPRESS)
+ gascount = MAXGASPRESS; // Clip at high end
+ else if (gascount < MINGASPRESS)
+ gascount = MINGASPRESS; // Clip at low end
+ // Update mbed LEDs to simulate gas selection
+ switch (gasselect)
+ {
+ case 1: {
+ led1 = 1; led2 = 0; led3 = 0; led4 = 0; }
+ break;
+ case 2: {
+ led1 = 0; led2 = 1; led3 = 0; led4 = 0;
+ LEDg2 = ON; LEDg3 = OFF; }
+ break;
+ case 3: {
+ led1 = 0; led2 = 0; led3 = 1; led4 = 0;
+ LEDg2 = OFF; LEDg3 = ON; }
+ break;
+ default: { // gasselect == 4
+ led1 = 0; led2 = 0; led3 = 0; led4 = 1; }
+ break;
+ }
+ LEDout(gascount);
+ //if (quadcount != quadcountold) pc.printf("%d psi\n\r", gascount);
+ } // if (mode == GASMODE)
} // sampleswitches()
int main()
{
+ pc.baud(19200);
+ pc.printf("\n\rConnected to mBed...\r\n");
+
/****** Program Starts Here *******/
// Initialize variables
quadnew = getquad(); // Get initial quadrature state
- quadold = quadnew;
- quadswitchold = OFF;
- #ifdef AMPSMODE
- quadcount = MAXAMPS200;
- #else
- quadcount = MAXGASPRESS;
- #endif
- select = 1; // Default mode/gas selection
+ quadold = quadnew; // Initialize state variables
+ quadswitchold = OFF; // Initialize state variables
+ mode = AMPSMODE; // Power up in AMPS selection mode
+ modetimer.stop();
+ modetimer.reset();
+ modechanged = FALSE; // Initialize state variables
+ select = 1; // Default discrete LED selection
gasselect = 1;
+ quada.mode(PullUp); // Enable pullup resistors on switch inputs
+ quadb.mode(PullUp);
+ quadsw.mode(PullUp);
+
+ ampscount = MAXAMPS200;
+ gascount = STARTGASPRESS;
// Turn off all LEDs first, and let sampleswitches update everything
- LED1a = OFF;
- LED1b = OFF;
- LED1c = OFF;
- LED1d = OFF;
- LED1e = OFF;
- LED1f = OFF;
- LED1g = OFF;
- LED2a = OFF;
- LED2b = OFF;
- LED2c = OFF;
- LED2d = OFF;
- LED2e = OFF;
- LED2f = OFF;
- LED2g = OFF;
- LED3a = OFF;
- LED3b = OFF;
- LED3c = OFF;
- LED3d = OFF;
- LED3e = OFF;
- LED3f = OFF;
- LED3g = OFF;
- LEDg2 = OFF;
- LEDg3 = OFF;
+ LED1a = OFF; LED1b = OFF; LED1c = OFF; LED1d = OFF; LED1e = OFF; LED1f = OFF; LED1g = OFF;
+ LED2a = OFF; LED2b = OFF; LED2c = OFF; LED2d = OFF; LED2e = OFF; LED2f = OFF; LED2g = OFF;
+ LED3a = OFF; LED3b = OFF; LED3c = OFF; LED3d = OFF; LED3e = OFF; LED3f = OFF; LED3g = OFF;
+ LEDg2 = OFF; LEDg3 = OFF;
// Set up interrupt call
- getswitches.attach_us(&sampleswitches, 25000); // setup getswitches to call sampleswitches every 25 ms
+ getswitches.attach_us(&sampleswitches, 10000); // setup getswitches to call sampleswitches every 10 ms
while (1)
{