serialO_v5.cpp

00001 #include "mbed.h"
00002 #include <iostream>
00003 #include <stdio.h>
00004 #include <ctype.h>
00005 #include <string.h>
00006 #include <locale.h> 
00007 #include "rtos.h"
00008 #include "SLCD.h"
00009 
00010 #define LCDLEN          10
00011 #define MAXCHAR         4
00012 #define ALL8          "8888"
00013 #define LCDUPDATE       100 //ms
00014 #define LEDBLINKTIME    300 // ms *** NOTE Change of units ***
00015 #define SERIALREADTIME  50 //ms
00016 // ASCII constants
00017 #define CR              '\r'
00018 
00019 
00020 
00021 
00022 DigitalOut rLed(LED_RED);
00023 
00024  
00025 Serial pc(USBTX, USBRX); // tx, rx
00026 SLCD slcd; //define LCD display
00027 char rxChar;
00028 char rxString[LCDLEN];
00029 string rxRealString;
00030 
00031 void clearString (char * aString){
00032     int i;
00033     int sSize = sizeof(aString);
00034     
00035     for (i=0; i< sSize; i++){
00036         aString[i] = NULL;
00037     }
00038     return;
00039 }
00040     
00041     
00042 
00043 void LCDMessNoDwell(char *lMess){
00044         slcd.Home();
00045         slcd.clear();
00046         slcd.printf(lMess);
00047 }
00048 
00049 // use "thread" in the name to keep things straight 
00050 // note the use of void constant * args - understand memory resources
00051 // Thes are "forever loops"
00052 void LCDdis_thread(void const *args){
00053     while(true) {
00054         LCDMessNoDwell(rxString);
00055         Thread::wait(LCDUPDATE);
00056     }
00057 }
00058 
00059 void serial_thread(void const *args){
00060    static int charIndex =0;
00061    int rxStringLen;
00062    while(true) {
00063       if (pc.readable()) {                // only read from the serial port if there is a character
00064             rxChar= toupper(pc.getc());              // reading clears the buffer
00065             // construct a 4-digit string for the LCD          
00066             // check for carriage return           
00067             if (rxChar == CR) { 
00068                 rxRealString.assign(rxString);                                                                
00069                 rxStringLen = rxRealString.length();      
00070                 pc.printf("%s - StringLen = %d OK \n\r", rxString, rxStringLen);
00071                 charIndex = 0; // start building string from position zero next time around
00072             } else {
00073                 if(charIndex == 0) clearString(rxString);
00074                 rxString[charIndex] = rxChar;
00075                 rxRealString.assign(rxString);
00076                 pc.printf("%s\n\r", rxString);      
00077                 charIndex = (charIndex + 1)% (MAXCHAR); // Only allow 4 characters then roll over
00078                
00079             }
00080       }
00081       Thread::wait(SERIALREADTIME);
00082     }
00083 }
00084 
00085 int main()
00086 {  
00087  
00088     Thread lthread(LCDdis_thread);
00089     Thread serthread(serial_thread);
00090     
00091     sprintf(rxString,"%s",ALL8);  // just put something on the LCD to show it's working
00092 
00093     while (true) {     
00094         rLed = !rLed; // toggle led
00095         Thread::wait(LEDBLINKTIME);
00096     }
00097 }