![](/media/cache/profiles/acab0116c354964a558e65bdd07ff047.jpg.50x50_q85.jpg)
updated for mbed os 5.4
Fork of Task641 by
main.cpp
- Committer:
- noutram
- Date:
- 2016-03-08
- Revision:
- 2:70084af839d3
- Parent:
- 1:4fb27aea76b2
- Child:
- 3:423191a375dc
File content as of revision 2:70084af839d3:
#include "mbed.h" #include "rtos.h" #include "string.h" #include <stdio.h> #include <ctype.h> #define RED_DONE 1 #define YELLOW_DONE 2 //Delays in ms #define TUNIT 250 #define TDOT TUNIT #define TDASH (3*TUNIT) #define TGAP TUNIT #define TLETTER (3*TUNIT) #define TWORD (7*TUNIT) //Size of the morse character buffer #define BUFFERSIZE 240 /* **** Morse Code *** . 1 unit - 3 units inter-space 1 unit between letters 3 units between words 7 units */ //Morse code const char* const morseAlpha[] = { ".-", //A "-...", //B "-.-.", //C "-..", //D ".", //E "..-.", //F "--.", //G "....", //H "..", //I ".---", //J "-.-", //K ".-..", //L "--", //M "-.", //N "---", //O ".--.", //P "--.-", //Q ".-.", //R "...", //S "-", //T "..-", //U "...-", //V ".--", //W "-..-", //X "-.--", //Y "--.." //Z }; const char* const morseNumeric[] = { "-----", //0 ".----", //1 "..---", //2 "...--", //3 "....-", //4 ".....", //5 "-....", //6 "--...", //7 "---..", //8 "----." //9 }; //Digital outputs DigitalOut onBoardLED(LED1); DigitalOut redLED(D7); DigitalOut yellowLED(D6); DigitalOut greenLED(D5); //Serial Interface Serial pc(USBTX, USBRX); //Digital inputs DigitalIn onBoardSwitch(USER_BUTTON); DigitalIn SW1(D4); DigitalIn SW2(D3); //Thread ID for the Main function (CMSIS API) osThreadId tidMain; //Thread sychronisation primatives Semaphore *spaceAvailable; Semaphore *samplesInBuffer; Mutex *bufferLock; //Output buffer char buffer[BUFFERSIZE]; unsigned int newestIndex = BUFFERSIZE-1; //First time it is incremented, it will be 0 unsigned int oldestIndex = BUFFERSIZE-1; //Producer void addCharacterToQueue(const char c) { //Is there space? spaceAvailable->wait(); //Ok, there is space - take the lock bufferLock->lock(); redLED = 1; //Update buffer newestIndex = (newestIndex+1) % BUFFERSIZE; buffer[newestIndex] = c; //Release lock bufferLock->unlock(); redLED = 0; //Signal that a sample has been added samplesInBuffer->release(); } //Consumer char takeCharacterFromQueue() { //Are thre any samples in the buffer samplesInBuffer->wait(); //Ok, there are samples - take the lock bufferLock->lock(); yellowLED = 1; //Update buffer - remove oldest oldestIndex = (oldestIndex+1) % BUFFERSIZE; char cc = buffer[oldestIndex]; //Release lock bufferLock->unlock(); yellowLED = 0; //Signal there is space in the buffer spaceAvailable->release(); //return a copy of the result return cc; } void morseGenerator( const void* arg ) { while (true) { //Are there samples available? char nextChar = takeCharacterFromQueue(); nextChar = tolower(nextChar); //Look up morse code //Space between words - assumes only one if (nextChar == ' ') { Thread::wait(TWORD-TLETTER); continue; } //Number? const char *nextString; if ((nextChar >= '0') && (nextChar <= '9')) { nextString = morseNumeric[nextChar - '0']; } //Character? else if ((nextChar >='a') && (nextChar <= 'z')) { nextString = morseAlpha[nextChar - 'a']; } else { //Invalid continue; } //Flash morse for this letter for (unsigned int n=0; n<strlen(nextString); n++) { char symb = nextString[n]; greenLED = 1; switch (symb) { case '.': Thread::wait(TDOT); break; case '-': Thread::wait(TDASH); break; default: break; } greenLED = 0; //A gap between symbols Thread::wait(TGAP); } //Gap between letters Thread::wait(TLETTER-TGAP); } } void convertToMorseAsync(const char* pString) { //Copy each character into the buffer int L = strlen(pString); for (int n=0; n<L; n++) { char c = pString[n]; addCharacterToQueue(c); } } //Main thread int main() { redLED = 0; yellowLED = 0; greenLED = 0; //Semaphores bufferLock = new Mutex(); spaceAvailable = new Semaphore(BUFFERSIZE); samplesInBuffer = new Semaphore(0); //Main thread ID tidMain = Thread::gettid(); //Thread for outputting mors Thread writer(morseGenerator); pc.printf("Type characters to send\n"); while (true) { //Read keyboard (serial port) char c = pc.getc(); pc.printf("\n"); addCharacterToQueue(c); } }