Diff: Serial_parser_v1.cpp

Revision:

4:31207d384db0

Parent:

3:2266158bf72f

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Serial_parser_v1.cpp	Mon Mar 23 16:37:23 2015 +0000
@@ -0,0 +1,201 @@
+#include "mbed.h"
+#include <iostream>
+#include <stdio.h>
+#include <ctype.h>
+#include <string.h>
+#include <locale.h> 
+#include "rtos.h"
+#include "SLCD.h"
+// Debug printout control
+#define PRINTDBUG
+#define PROGNAME        "Serial_parser_v1 - sc\n\r"
+
+#define LCDLEN          10
+#define MAXCHAR         4
+#define ALL8          "8888"
+#define LCDUPDATE       100 //ms
+#define LEDBLINKTIME    300 // ms *** NOTE Change of units ***
+#define SERIALREADTIME  50 //ms
+// ASCII constants
+#define CR              '\r'
+#define ALLNOTES        "CDEFGAB" // Note only 7 unique notes.
+#define NONOTE          7
+#define OCTAVELLEN      7
+#define VALIDOCTAVES    "45"
+#define NOOCTAVE        2
+#define NUMTONES        14 // length of two octaves
+#define COMMANDLEN      2 //Max characters in the command
+#define NOTOK           "NOK"
+
+#define NOTEOFFSET      1
+#define NOTEINVALID     20 // length of
+
+
+
+float diatonicScale[NUMTONES] = {261.63,293.66,329.63,349.23,392.00,440.00,493.88,523.25,587.33,659.25,698.46,783.99,880.00,987.77};
+
+DigitalOut rLed(LED_RED);
+
+ 
+Serial pc(USBTX, USBRX); // tx, rx
+SLCD slcd; //define LCD display
+char rxChar;
+char rxString[LCDLEN];
+string rxRealString;
+bool commandReady = false; // This is the flag to even look at the command string
+
+void clearString (char * aString){
+    int i;
+    int sSize = sizeof(aString);
+    
+    for (i=0; i< sSize; i++){
+        aString[i] = NULL;
+    }
+    return;
+}
+    
+    
+int isNote(char theNote){ //check for valid onte
+    int noteListLen = sizeof(ALLNOTES);
+    int pos = NONOTE;
+    int i;
+    for (i=0; i<noteListLen; i++){
+        if (ALLNOTES[i] == theNote){
+            pos = i;
+            break;
+        }
+    }
+    return (pos);
+}
+
+int isOctave(char theOct){ //check for valid onte
+    int noteListLen = sizeof(VALIDOCTAVES);
+    int pos = NOOCTAVE;
+    int i;
+    for (i=0; i<noteListLen; i++){
+        if (VALIDOCTAVES[i] == theOct){
+            pos = i;
+            break;
+        }
+    }
+    return (pos);
+}
+
+/* one way to do the parsing **************
+void parseCommand (char * commandChars){
+    int charPos = 0;  
+    int noteIndex = 0; // this is the length into the diatonic scale array
+    bool validCommand = false;
+    
+    noteIndex = isNote(commandChars[charPos]);
+    validCommand = (noteIndex != NONOTE); // First test for a good command string
+    if (validCommand) {
+        charPos++;
+        noteIndex = noteIndex + OCTAVELLEN * isOctave(commandChars[charPos]);
+        validCommand = (noteIndex < NUMTONES); // Final test for a good string
+    }
+#ifdef PRINTDBUG
+    if (validCommand) {
+        pc.printf("%s - IsNote - %4.2f OK\n\r", rxString, diatonicScale[noteIndex]); 
+        sprintf(rxString,"%4.1f", diatonicScale[noteIndex]); // show frequency on LCD
+    } else {
+        pc.printf("%s - Not a Note NOK\n\r", rxString);
+        sprintf(rxString,"%s", NOTOK );
+    } 
+#endif
+    return;
+}
+**************** */   
+// calculating the valid command
+void parseCommand (char * commandChars){
+#define NOTEPOS     0 // index of note and octive tokens
+#define OCTPOS      1
+    int noteIndex;
+    int octaveIndex;
+    int diatonicArrayIndex = 0; // this is the length into the diatonic scale array
+    bool validCommand = false;
+    
+    noteIndex = isNote(commandChars[NOTEPOS]);
+    octaveIndex = isOctave(commandChars[OCTPOS]);
+    validCommand = ((noteIndex != NONOTE)&&(octaveIndex != NOOCTAVE)); // test for good command string
+#ifdef PRINTDBUG
+    if (validCommand) {
+        diatonicArrayIndex = noteIndex + (OCTAVELLEN * octaveIndex);
+        pc.printf("%s - IsNote - %4.2f OK\n\r", rxString, diatonicScale[diatonicArrayIndex]); 
+        sprintf(rxString,"%4.1f", diatonicScale[diatonicArrayIndex]); // show frequency on LCD
+    } else {
+        pc.printf("%s - Not a Note NOK\n\r", rxString);
+        sprintf(rxString,"%s", NOTOK );
+    } 
+#endif
+    return;
+}
+void LCDMessNoDwell(char *lMess){
+        slcd.Home();
+        slcd.clear();
+        slcd.printf(lMess);
+}
+
+// use "thread" in the name to keep things straight 
+// note the use of void constant * args - understand memory resources
+// Thes are "forever loops"
+void LCDdis_thread(void const *args){
+    while(true) {
+        LCDMessNoDwell(rxString);
+        Thread::wait(LCDUPDATE);
+    }
+}
+
+
+void serial_thread(void const *args){
+   static int charIndex =0;
+   int rxStringLen;
+   while(true) {
+      if (pc.readable()) {                // only read from the serial port if there is a character
+            rxChar= toupper(pc.getc());           // reading clears the buffer
+            // noteOK = isNote(rxChar);
+            // construct a 4-digit string for the LCD          
+            // check for carriage return           
+            if (rxChar == CR) { 
+                rxRealString.assign(rxString);                                                                
+                rxStringLen = rxRealString.length();  
+                 if(rxStringLen == COMMANDLEN) { // if the input string does not equal the expected 
+                     parseCommand(rxString);     // command length it's not a good command 
+                 } else { 
+ #ifdef PRINTDBUG
+                    pc.printf("%s NOK\n\r", rxString); 
+                    sprintf(rxString,"%s", NOTOK );
+#endif                                     
+                }
+                charIndex = 0; // start building string from position zero next time around
+            } else {
+                if(charIndex == 0) clearString(rxString);
+                rxString[charIndex] = rxChar;
+                rxRealString.assign(rxString); 
+#ifdef PRINTDBUG
+                    pc.printf("%s\n\r", rxString); // This echo's the new char and prevous up to 4 chars
+#endif        
+                charIndex = (charIndex + 1)% (MAXCHAR); // Only allow 4 characters then roll over            
+            }
+      }
+      Thread::wait(SERIALREADTIME);
+    }
+}
+
+int main()
+{  
+ 
+    Thread lthread(LCDdis_thread);
+    Thread serthread(serial_thread);
+    
+    sprintf(rxString,"%s",ALL8);  // just put something on the LCD to show it's working
+    
+#ifdef PRINTDBUG
+        pc.printf(PROGNAME);
+#endif
+
+    while (true) {     
+        rLed = !rLed; // toggle led
+        Thread::wait(LEDBLINKTIME);
+    }
+}
\ No newline at end of file