Brad Smith / Mbed 2 deprecated rtcController

Gets current time from the PC over a serial connection

Dependencies:   mbed

Python script available on the wiki page

Parser.cpp@0:c8dd8b2c6942, 2015-11-12 (annotated)

Committer:
mbedDevLondon
Date:
Thu Nov 12 19:17:47 2015 +0000
Revision:
0:c8dd8b2c6942
Converted to FRDM board

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbedDevLondon 0:c8dd8b2c6942 1 #include "./Parser.h"
mbedDevLondon 0:c8dd8b2c6942 2 #include <string.h>
mbedDevLondon 0:c8dd8b2c6942 3 #include <stdio.h>
mbedDevLondon 0:c8dd8b2c6942 4
mbedDevLondon 0:c8dd8b2c6942 5 char *commandTokens[20];
mbedDevLondon 0:c8dd8b2c6942 6 char invalidMessage[] = "INVALID NEMA SENTENCE";
mbedDevLondon 0:c8dd8b2c6942 7 char endOfTokensMessage[] = "END OF TOKENS";
mbedDevLondon 0:c8dd8b2c6942 8
mbedDevLondon 0:c8dd8b2c6942 9 char validateCommandSentence(char *pSentence)
mbedDevLondon 0:c8dd8b2c6942 10 {
mbedDevLondon 0:c8dd8b2c6942 11 char chkSumToken[3];
mbedDevLondon 0:c8dd8b2c6942 12 unsigned char calculatedChecksum = 0;
mbedDevLondon 0:c8dd8b2c6942 13 char errorCode = NOERROR;
mbedDevLondon 0:c8dd8b2c6942 14 printf("\n\r\n\r>>>>>>>>>>>> %s <<<<\n\n\n\r", pSentence);
mbedDevLondon 0:c8dd8b2c6942 15 if(*pSentence != '$')
mbedDevLondon 0:c8dd8b2c6942 16 {
mbedDevLondon 0:c8dd8b2c6942 17 printf("error no $\n\r");
mbedDevLondon 0:c8dd8b2c6942 18 return ERROR;
mbedDevLondon 0:c8dd8b2c6942 19 }
mbedDevLondon 0:c8dd8b2c6942 20 pSentence++;
mbedDevLondon 0:c8dd8b2c6942 21
mbedDevLondon 0:c8dd8b2c6942 22 while (*pSentence != '\0' && *pSentence != '*') {
mbedDevLondon 0:c8dd8b2c6942 23 calculatedChecksum ^= *pSentence;
mbedDevLondon 0:c8dd8b2c6942 24 pSentence++;
mbedDevLondon 0:c8dd8b2c6942 25 }
mbedDevLondon 0:c8dd8b2c6942 26
mbedDevLondon 0:c8dd8b2c6942 27 if(*pSentence == '*'){
mbedDevLondon 0:c8dd8b2c6942 28 sprintf(chkSumToken, "%02x", calculatedChecksum);
mbedDevLondon 0:c8dd8b2c6942 29 printf("Calc chksum %s<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n\r", chkSumToken);
mbedDevLondon 0:c8dd8b2c6942 30 pSentence++;
mbedDevLondon 0:c8dd8b2c6942 31 if(strcmp(pSentence, chkSumToken) != 0)
mbedDevLondon 0:c8dd8b2c6942 32 {
mbedDevLondon 0:c8dd8b2c6942 33 printf("checksum error>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>");
mbedDevLondon 0:c8dd8b2c6942 34 errorCode = ERROR;
mbedDevLondon 0:c8dd8b2c6942 35 }
mbedDevLondon 0:c8dd8b2c6942 36 }
mbedDevLondon 0:c8dd8b2c6942 37 else {
mbedDevLondon 0:c8dd8b2c6942 38 printf("error:***** %s\n\r",pSentence);
mbedDevLondon 0:c8dd8b2c6942 39 errorCode = ERROR;
mbedDevLondon 0:c8dd8b2c6942 40 }
mbedDevLondon 0:c8dd8b2c6942 41
mbedDevLondon 0:c8dd8b2c6942 42 printf("<<<<< errorcode %d\n\r", errorCode);
mbedDevLondon 0:c8dd8b2c6942 43 return errorCode;
mbedDevLondon 0:c8dd8b2c6942 44 }
mbedDevLondon 0:c8dd8b2c6942 45
mbedDevLondon 0:c8dd8b2c6942 46 // parseCommandSentence() requires that the trailing <cr><lf> characters
mbedDevLondon 0:c8dd8b2c6942 47 // be removed prior to calling this function. Failing to do so will cause
mbedDevLondon 0:c8dd8b2c6942 48 // validateNemaSentence() to report an ERROR
mbedDevLondon 0:c8dd8b2c6942 49
mbedDevLondon 0:c8dd8b2c6942 50 void parseCommandSentence( char *pBuffer)
mbedDevLondon 0:c8dd8b2c6942 51 {
mbedDevLondon 0:c8dd8b2c6942 52 if (validateCommandSentence(pBuffer) == ERROR) {
mbedDevLondon 0:c8dd8b2c6942 53 commandTokens[0]= invalidMessage;
mbedDevLondon 0:c8dd8b2c6942 54 commandTokens[1]= endOfTokensMessage;
mbedDevLondon 0:c8dd8b2c6942 55 }
mbedDevLondon 0:c8dd8b2c6942 56 else{
mbedDevLondon 0:c8dd8b2c6942 57 //so valid sentence ...................................
mbedDevLondon 0:c8dd8b2c6942 58 int tokenCounter = 0;
mbedDevLondon 0:c8dd8b2c6942 59
mbedDevLondon 0:c8dd8b2c6942 60 commandTokens[tokenCounter]=pBuffer;
mbedDevLondon 0:c8dd8b2c6942 61 pBuffer++;
mbedDevLondon 0:c8dd8b2c6942 62 tokenCounter++;
mbedDevLondon 0:c8dd8b2c6942 63
mbedDevLondon 0:c8dd8b2c6942 64 while( *pBuffer != '\0'){
mbedDevLondon 0:c8dd8b2c6942 65 //until the end of sentence is found,
mbedDevLondon 0:c8dd8b2c6942 66 //search for comma deliminators
mbedDevLondon 0:c8dd8b2c6942 67 if(*pBuffer == ','){
mbedDevLondon 0:c8dd8b2c6942 68 //found end of token
mbedDevLondon 0:c8dd8b2c6942 69 *pBuffer = '\0'; //replace deliminator with a null character
mbedDevLondon 0:c8dd8b2c6942 70
mbedDevLondon 0:c8dd8b2c6942 71 pBuffer++; // save address of next token
mbedDevLondon 0:c8dd8b2c6942 72 commandTokens[tokenCounter]=pBuffer;
mbedDevLondon 0:c8dd8b2c6942 73 tokenCounter++;
mbedDevLondon 0:c8dd8b2c6942 74 }
mbedDevLondon 0:c8dd8b2c6942 75 else pBuffer++;
mbedDevLondon 0:c8dd8b2c6942 76 }//eo while not end of string
mbedDevLondon 0:c8dd8b2c6942 77 commandTokens[tokenCounter] = endOfTokensMessage;
mbedDevLondon 0:c8dd8b2c6942 78
mbedDevLondon 0:c8dd8b2c6942 79 }//eo Valid sentence:::::::::::::::::::::::::::::::::::::
mbedDevLondon 0:c8dd8b2c6942 80
mbedDevLondon 0:c8dd8b2c6942 81 }//eo parseNemaSentence( char *pBuffer) ========================================
mbedDevLondon 0:c8dd8b2c6942 82
mbedDevLondon 0:c8dd8b2c6942 83
mbedDevLondon 0:c8dd8b2c6942 84 //calculate a XOR checksum for a string
mbedDevLondon 0:c8dd8b2c6942 85 char calcChecksum(char *pSentence)
mbedDevLondon 0:c8dd8b2c6942 86 {
mbedDevLondon 0:c8dd8b2c6942 87 unsigned char calculatedChecksum = 0;
mbedDevLondon 0:c8dd8b2c6942 88
mbedDevLondon 0:c8dd8b2c6942 89 while (*pSentence != '\0' ) {
mbedDevLondon 0:c8dd8b2c6942 90 calculatedChecksum ^= *pSentence;
mbedDevLondon 0:c8dd8b2c6942 91 pSentence++;
mbedDevLondon 0:c8dd8b2c6942 92 }
mbedDevLondon 0:c8dd8b2c6942 93 return calculatedChecksum;
mbedDevLondon 0:c8dd8b2c6942 94 }