Diff: acc_341.cpp

Revision:

6:0f05e120b749

Parent:

5:29c6ba524263

--- a/acc_341.cpp	Mon Nov 14 15:50:33 2016 +0000
+++ b/acc_341.cpp	Mon Nov 21 04:43:21 2016 +0000
@@ -1,9 +1,9 @@
 #include "mbed.h"
-#include <math.h> 
+#include <math.h>
 #include "MMA8451Q.h"
 #include "SLCD.h"
 
-/* 
+/*
 Test of the accelerometer, digital I/O, on-board LCD screen.
  Looing at vector product of the x-y components of the accelerometer.
  Works pretty well. Still rough, program wise - sc 140710
@@ -11,73 +11,100 @@
 
 #define DATAINTERVAL 0.200
 #define LCDDATALEN 10
-
+// buttons
+#define NUMBUTS 1
+#define LBUT PTC12  // port addresses for buttons
+//#define RBUT PTC3
+#define BUTTONTIME 0.2
+// lcd title
+#define LCDTITLE "ACCL"
+#define TITLEWAIT .8
+// serial title
 #define PROGNAME "ACCLCD341-541\r\n"
 
 #define PRINTDBUG
-// 
-#if   defined (TARGET_KL25Z) || defined (TARGET_KL46Z)
-  PinName const SDA = PTE25;  // Data pins for the accelerometer/magnetometer.
-  PinName const SCL = PTE24;  // DO NOT CHANGE
-#elif defined (TARGET_KL05Z)
-  PinName const SDA = PTB4;
-  PinName const SCL = PTB3;
-#else
-  #error TARGET NOT DEFINED
+#if defined (TARGET_KL25Z) || defined (TARGET_KL46Z)
+PinName const SDA = PTE25;  // Data pins for the accelerometer/magnetometer.
+PinName const SCL = PTE24;  // DO NOT CHANGE
 #endif
-
 #define MMA8451_I2C_ADDRESS (0x1d<<1)
-
 SLCD slcd; //define LCD display
 char lcdData[LCDDATALEN]; //buffer needs places dor decimal pt and colon
 
 MMA8451Q acc(SDA, SCL, MMA8451_I2C_ADDRESS);
 Serial pc(USBTX, USBRX);
-Timer dataTimer;
+Timer DataTimer;
 
-   
+Timer ButtonTimer; // for reading button states
+DigitalIn buttons[NUMBUTS] = {LBUT};
 
-void LCDMess(char *lMess){
-        slcd.Home();
-        slcd.clear();
-        slcd.printf(lMess);
-} 
+void LCDMess(char *lMess)
+{
+    slcd.Home();
+    slcd.clear();
+    slcd.printf(lMess);
+}
 
-void LCDsignedFloat(float theNumber){
-    sprintf (lcdData," %3.2f",theNumber); 
-    if (theNumber < 0.0) sprintf (lcdData,"<%3.2f",fabs(theNumber));   
-    LCDMess(lcdData); 
-} 
+void initialize_global_vars()
+{
+    // print lcd title
+    pc.printf(PROGNAME);
+    LCDMess(LCDTITLE);
+    wait(TITLEWAIT);
+    // set up DAQ timers
+    DataTimer.start();
+    DataTimer.reset();
+    // set up button timers
+    ButtonTimer.start();
+    ButtonTimer.reset();
+}
 
-void initialize_global_vars(){
-    pc.printf(PROGNAME);
-    dataTimer.start();
-    dataTimer.reset(); 
-} 
+void LCDsignedFloat(float theNumber)
+{
+    sprintf (lcdData," %3.2f",theNumber);
+    if (theNumber < 0.0) sprintf (lcdData,"<%3.2f",fabs(theNumber));
+    LCDMess(lcdData);
+}
 
-int main() {
-    float xAcc;
-    float yAcc; 
-    float zAcc; 
-    
+int main()
+{
+    int displayState = 0;
+    char axis = ' ';
+    float accl[3] = {0,0,0};
+
     initialize_global_vars();
-// main loop forever 
     while(true) {
-        if(dataTimer.read() > DATAINTERVAL){
-            dataTimer.reset();             
-//Get accelerometer data - tilt angles minus offset for zero mark.
-            xAcc = acc.getAccX();
-            yAcc = acc.getAccY(); 
-            zAcc = acc.getAccZ();     
- 
-#ifdef PRINTDBUG
-        pc.printf("xAcc = %f\r\n", xAcc);
-        pc.printf("yAcc = %f\r\n", yAcc);
-        pc.printf("zAcc = %f\r\n", zAcc);
-#endif
-
-        LCDsignedFloat(xAcc);
-// Wait then do the whole thing again.
-       }
+        if(DataTimer.read() > DATAINTERVAL) {
+            DataTimer.reset();
+            accl[0] = acc.getAccX();
+            accl[1] = acc.getAccY();
+            accl[2] = acc.getAccZ();
+            LCDsignedFloat(accl[displayState]);
+        }
+        if (ButtonTimer > BUTTONTIME) {
+            if(!buttons[0]) {
+                // a button is pressed
+                switch(displayState) {
+                    case 0:
+                        axis = 'x';
+                        LCDMess(&axis);
+                        wait(.5);
+                        break;
+                    case 1:
+                        axis = 'y';
+                        LCDMess(&axis);
+                        wait(.5);
+                        break;
+                    case 2:
+                        axis = 'z';
+                        LCDMess(&axis);
+                        wait(.5);
+                        break;
+                }
+                displayState++;
+                displayState = displayState%3;
+                ButtonTimer.reset();
+            }
+        }
     }
 }
\ No newline at end of file