Diff: main.cpp

Revision:

0:4555c427d7a8

Child:

1:0a93e9e88ad3

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed Oct 07 20:28:50 2015 +0000
@@ -0,0 +1,246 @@
+#include "mbed.h"
+#include "LM75B.h"
+#include "MMA7455.h"
+#include "EthernetInterface.h"
+
+#define F 0
+#define C 1
+
+// thresholds for detecting a rotation of 90 deg or more
+#define X_TH 60
+#define Y_TH 60
+#define Z_TH 0
+
+/*
+**************************
+    Display Functions
+**************************
+*/
+void displayBanner();
+void newline();
+
+/*
+**************************
+    Utility Functions
+**************************
+*/
+float tempConverter(float inTemp, bool convDir);
+void accFeed();
+void sampleAcc(int period, int32_t data[3]);
+
+/*
+**************************
+       Global Data
+**************************
+*/
+const char banner[37] = "Serial Comm Established with LPC4088";
+
+// holds last temperature reading
+float currTemp = 0;
+
+// x, y, z
+// holds current position
+int32_t accPos[3]           = {};
+// holds up to 20 samples of data
+int32_t accData[20][20][20] = {};
+// holds calibration offsets
+int32_t accCal[3]           = {};
+
+/*
+**************************
+         Objects
+**************************
+*/
+// UART connection to PC
+Serial terminal(USBTX, USBRX);
+// accelerometer on I2C bus
+MMA7455 acc(P0_27, P0_28);
+// temperature sensor on I2C bus
+LM75B temp(P0_27, P0_28, LM75B::ADDRESS_1, 120);
+// ethernet connection to log sensor data on a server
+EthernetInterface eth;
+
+int main() {
+    /*
+    **************************
+         Initializations
+    **************************
+    */
+    SerialInit();
+    EthernetInit();
+    TempInit();
+    AccInit();
+    /*
+    **************************
+          Main Execution
+    **************************
+    */
+    while(1) {
+        currTemp = (float)temp;
+        terminal.printf("Current temperature (F): %.1f", tempConverter(currTemp, F));
+        newline();
+        
+        acc.read(accPos[0], accPos[1], accPos[2]);
+        while(accPos[2] < Z_TH) {
+            // output audible beep
+            //alarm = 1;
+            terminal.printf("BEEEEEP!");
+            newline();
+            acc.read(accPos[0], accPos[1], accPos[2]);
+        }
+        wait(1);
+        //alarm = 0;    
+    }
+}
+
+/*
+**************************
+   Function Definitions
+**************************
+*/
+void SerialInit()
+{
+    // initialize connection to PC
+    terminal.baud(19200);
+    displayBanner();
+    newline();
+}
+
+void EthernetInit()
+{
+    // initialize ethernet connection
+    terminal.printf("Establishing ethernet connection...");
+    newline();
+    // use DHCP - static IP
+    eth.init("192.168.1.4","255.255.255.0","192.168.1.1"); 
+    eth.connect();
+    terminal.printf("  IP Address: %s", eth.getIPAddress()); newline();
+    TCPSocketConnection socket;
+    socket.connect("192.168.1.3", 1001);
+    if(socket.is_connected()) {
+        terminal.printf("  Connected!");
+        // write to server
+        char http_cmd[] = "This is a test";  
+        socket.send_all(http_cmd, sizeof(http_cmd)-1);
+    }
+    else
+        terminal.printf("  Unable to connect.");
+    newline(); newline();
+}
+
+void TempInit()
+{
+    terminal.printf("Temperature sensor...");
+    // verify connection with temp sensor
+    if(temp.open()) {
+        terminal.printf("initialized.");
+        newline();
+    }
+    else {
+        terminal.printf("unavailable.");
+        newline();
+    }
+}
+
+void AccInit()
+{
+    // configure accelerometer for 2G range
+    acc.setMode(MMA7455::ModeMeasurement);
+    acc.setRange(MMA7455::Range_2g);
+    terminal.printf("Calibrating accelerometer...");
+    
+    // if we can successfully calibrate the accelerometer...
+    if(acc.calibrate()) {
+        newline();
+        acc.getCalibrationOffsets(accCal[0], accCal[1], accCal[2]);
+        terminal.printf("  Offsets are (xyz): (%d) (%d) (%d)", accCal[0], accCal[1], accCal[2]);
+        newline(); newline();
+    }
+    else {
+        terminal.printf("failed.");
+        newline(); newline();
+    }
+}
+
+void newline()
+{
+    // newline = carriage return + line feed
+    terminal.putc('\n');
+    terminal.putc('\r');
+}
+
+/*
+    Displays the following header:
+************************************************                                
+Serial Comm Established with LPC4088                                            
+************************************************ 
+*/
+void displayBanner()
+{
+    int i = 0;
+    for(int j = 0; j < 48; j++)
+        terminal.putc('*');  
+    newline();
+          
+    while(i != 36) {
+        char c = banner[i];
+        terminal.putc(c);
+        i++;
+    }
+    newline();
+    
+    for(int j = 0; j < 48; j++)
+        terminal.putc('*');    
+}
+
+// converts a temperature reading from C > F or F > C
+// convDir = 0: F > C  
+// convDir = 1: C > F
+float tempConverter(float inTemp, bool convDir)
+{
+    const float CToF = (9.0/5.0);
+    const float FToC = (5.0/9.0);
+    const int offset = 32;
+    if(convDir == 0){ //Convert C to F
+        return (inTemp * CToF) + offset;
+    }
+    else{ //Convert F to C
+        return (inTemp - offset) * FToC;
+    }       
+}
+
+// prints the current positional data from the accelerometer
+void accFeed()
+{
+    // returns false if the mode is set to standby or unable to convert
+    if(acc.read(accPos[0], accPos[1], accPos[2])) {             
+        terminal.printf("x: %d y: %d z: %d", accPos[0], accPos[1], accPos[2]);
+        newline();
+    }
+    else {
+        terminal.printf("Unable to access MMA7455");
+        newline();
+    }
+}
+
+/* 
+    Samples the accelerometer in 1/4s intervals for the length of "period" (max 5).
+    The results are placed in the 3D array. Additionally, the array passed in
+    will hold the last reading.
+*/
+void sampleAcc(int period, int32_t data[3])
+{   
+    for(int i = 0; i < period*4; i++) {
+        //load temps
+        acc.read(data[0], data[1], data[2]);
+        accData[i][0][0] = data[0]; // x
+        accData[0][i][0] = data[1]; // y
+        accData[0][0][i] = data[2]; // z
+        wait(.25);
+    }   
+    // if we didn't fill the whole array, we'll clear it to avoid confusion later
+    if(period < 5) {
+        for(int i = period*4; i < 20; i++)
+            accData[i][i][i] = 0;
+    }
+}
\ No newline at end of file