main.cpp

00001 //Michael Antonucci
00002 //Last modified Oct. 27, 2022
00003 //Assignment 4, Exercise 1: Create a working code to parse NMEA inputs into human-readable data
00004 #include "mbed.h"
00005 
00006 Serial pc(USBTX, USBRX);
00007 
00008 char dataque[100]; //calls for an array of 100 characters long with the name "dataque"
00009 char header[5]; //calls for an array of 5 characters long with name "header"
00010 float lat;   //creates float "lat" for latitude
00011 float longi; //creates float "longi" for longitude
00012 char ns[1];  //creates array of 1 character with name "ns"
00013 char ew[1]; //creates array of 1 character with name "ew"
00014 float elevation; //creates float "elevation"
00015 char checksum[2]; //calls for an array of 2 characters long with name "checksum"
00016 int seconds; //creates integer "seconds" for time
00017 float xaccel; //creates float "xaccel" for x acceleration
00018 float yaccel; //creates float "yaccel" for y acceleration
00019 float zaccel; //creates float "zaccel" for z acceleration
00020 float temp; //creates float "temp" for temperature
00021 int main() { //starts main code
00022     while(1) {
00023         if (pc.readable()) { 
00024         pc.scanf("%s",dataque); 
00025         sscanf(dataque,"$%5s",header);
00026             if (!strcmp(header,"GPRMC")) { //if the header is "GPRMC"
00027              sscanf(dataque,"$%5s,%d,%f,%1s,%f,%1s,%f,*%2s", //reassigns variables to data
00028                              header,&seconds,&lat,ns,&longi,ew,&elevation,checksum);
00029              pc.printf("GPS NMEA string recieved:\r\n"); //prints type of message
00030              pc.printf("Time: %d seconds\r\n",seconds); //prints time
00031              pc.printf("Latitude: %f degrees %s",lat,ns); //prints latitude
00032              pc.printf("Longitude: %f degrees %s\r\n",longi,ew); //prints longitude
00033              pc.printf("Elevation: %f m\r\n",elevation); //prints elevation
00034              pc.printf("Checksum Value: %s",checksum); //prints checksum value
00035              }
00036             else if (!strcmp(header,"IMUPO")) { //if the header is "IMUPO", print a message
00037              sscanf(dataque,"$%5s,%d,%f,%f,%f,*%2s", //reassigns variables to data
00038                              header,
00039                              &seconds,
00040                              &xaccel,
00041                              &yaccel,
00042                              &zaccel,
00043                              checksum);
00044              pc.printf("Motion Message NMEA string recieved:\r\n"); //prints type of data
00045              pc.printf("Time: %d seconds\r\n",seconds); //prints time
00046              pc.printf("X-Acceleration: %f m/s^2 \r\n",xaccel); //prints x acceleration
00047              pc.printf("Y-Acceleration: %f m/s^2 \r\n",yaccel); //prints y acceleration
00048              pc.printf("Z-Acceleration: %f m/s^2 \r\n",zaccel); //prints z acceleration
00049              pc.printf("Checksum Value: %2s \r\n",checksum); //prints checksum value
00050              }
00051             else if (!strcmp(header,"TEMPE")) { //if the header is "TEMPE", print a message
00052              sscanf(dataque,"$%5s,%d,%f,*%2s", //reassigns variables to data
00053                             header,
00054                             &seconds,
00055                             &temp,
00056                             checksum);
00057              pc.printf("Temperature NMEA string recieved:\r\n"); //prints type of data
00058              pc.printf("Time: %d seconds\r\n",seconds); //prints time
00059              pc.printf("Temperature: %f degrees Celcius\r\n",temp); //prints temperature
00060              pc.printf("Checksum Value: %2s \r\n",checksum); //prints checksum value
00061              }
00062             else { //if the header is not one of those three, respond with an error message
00063              pc.printf("NOT A VALID NMEA INDICATOR \r\n"); //shows that error is associated with header format
00064              }
00065             }
00066         }
00067     }