serialO_v6.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 // Debug printout control
00010 #define PRINTDBUG
00011 #define PROGNAME        "SerialIO v6\n\r"
00012 
00013 #define LCDLEN          10
00014 #define MAXCHAR         4
00015 #define ALL8          "8888"
00016 #define LCDUPDATE       100 //ms
00017 #define LEDBLINKTIME    300 // ms *** NOTE Change of units ***
00018 #define SERIALREADTIME  50 //ms
00019 // ASCII constants
00020 #define CR              '\r'
00021 #define ALLNOTES        "CDEFGAB" // Note only 7 unique notes.
00022 #define NUMTONES        10
00023 #define NONOTE          8
00024 #define NOTEOFFSET      1
00025 
00026 
00027 
00028 float diatonicScale[NUMTONES] = {246.94, 261.63,293.66,329.63,349.23,392.00,440.00,493.88,523.25,587.33};
00029 
00030 DigitalOut rLed(LED_RED);
00031 
00032  
00033 Serial pc(USBTX, USBRX); // tx, rx
00034 SLCD slcd; //define LCD display
00035 char rxChar;
00036 char rxString[LCDLEN];
00037 string rxRealString;
00038 
00039 void clearString (char * aString){
00040     int i;
00041     int sSize = sizeof(aString);
00042     
00043     for (i=0; i< sSize; i++){
00044         aString[i] = NULL;
00045     }
00046     return;
00047 }
00048     
00049     
00050 int isNote(char theNote){ //check for valid onte
00051     int noteListLen = sizeof(ALLNOTES);
00052     int pos = NONOTE;
00053     int i;
00054     for (i=0; i<noteListLen; i++){
00055         if (ALLNOTES[i] == theNote){
00056             pos = i;
00057             break;
00058         }
00059     }
00060     return (pos);
00061 }
00062 
00063 
00064 void LCDMessNoDwell(char *lMess){
00065         slcd.Home();
00066         slcd.clear();
00067         slcd.printf(lMess);
00068 }
00069 
00070 // use "thread" in the name to keep things straight 
00071 // note the use of void constant * args - understand memory resources
00072 // Thes are "forever loops"
00073 void LCDdis_thread(void const *args){
00074     while(true) {
00075         LCDMessNoDwell(rxString);
00076         Thread::wait(LCDUPDATE);
00077     }
00078 }
00079 
00080 void serial_thread(void const *args){
00081    static int charIndex =0;
00082    int rxStringLen;
00083    int noteOK;
00084    while(true) {
00085       if (pc.readable()) {                // only read from the serial port if there is a character
00086             rxChar= toupper(pc.getc());           // reading clears the buffer
00087             noteOK = isNote(rxChar);
00088             // construct a 4-digit string for the LCD          
00089             // check for carriage return           
00090             if (rxChar == CR) { 
00091                 rxRealString.assign(rxString);                                                                
00092                 rxStringLen = rxRealString.length();  
00093 #ifdef PRINTDBUG    
00094                 pc.printf("%s - StringLen = %d OK \n\r", rxString, rxStringLen);
00095 #endif  
00096                 charIndex = 0; // start building string from position zero next time around
00097             } else {
00098                 if(charIndex == 0) clearString(rxString);
00099                 rxString[charIndex] = rxChar;
00100                 rxRealString.assign(rxString);
00101 #ifdef PRINTDBUG
00102                 if(noteOK != NONOTE){
00103                     pc.printf("%s - IsNote - %4.2f\n\r", rxString, diatonicScale[noteOK + NOTEOFFSET]); 
00104                 } else {
00105                     pc.printf("%s - Not a Note\n\r", rxString);
00106                 }  
00107 #endif                  
00108                 charIndex = (charIndex + 1)% (MAXCHAR); // Only allow 4 characters then roll over
00109                
00110             }
00111       }
00112       Thread::wait(SERIALREADTIME);
00113     }
00114 }
00115 
00116 int main()
00117 {  
00118  
00119     Thread lthread(LCDdis_thread);
00120     Thread serthread(serial_thread);
00121     
00122     sprintf(rxString,"%s",ALL8);  // just put something on the LCD to show it's working
00123     
00124 #ifdef PRINTDBUG
00125         pc.printf(PROGNAME);
00126 #endif
00127 
00128     while (true) {     
00129         rLed = !rLed; // toggle led
00130         Thread::wait(LEDBLINKTIME);
00131     }
00132 }