james kain / Mbed 2 deprecated Waldo_Embed_V2

this version has all of Jim's fixes for reading the GPS and IMU data synchronously

Dependencies:   MODSERIAL SDFileSystem mbed SDShell CRC CommHandler FP LinkedList LogUtil

PCMessaging.h@29:dead10cce6e9, 2014-01-09 (annotated)

Committer:
jekain314
Date:
Thu Jan 09 14:09:05 2014 +0000
Revision:
29:dead10cce6e9
Parent:
26:c2208b0ff78b
Child:
30:96d133f3008e
initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jekain314 0:432b860b6ff7 1 //these are defines for the messages that are sent from the PC across the USB
jekain314 0:432b860b6ff7 2 //these messages produce reactions on the mbed
jekain314 29:dead10cce6e9 3 const unsigned char FIRE_TRIGGER_MSG = 1;
jekain314 0:432b860b6ff7 4
jekain314 6:71da5b99de97 5 const unsigned short serBuffMax = 18;
jekain314 1:8e24e633f8d8 6 char serBuf[serBuffMax];
jekain314 0:432b860b6ff7 7 int serBufChars=0;
jekain314 0:432b860b6ff7 8
jekain314 0:432b860b6ff7 9 //flags to control the PC command actions
jekain314 1:8e24e633f8d8 10 bool fireTrigger =false;
jekain314 0:432b860b6ff7 11
jekain314 0:432b860b6ff7 12 unsigned char CR = 0x0d; //ASCII Carriage Return
jekain314 0:432b860b6ff7 13 unsigned char LF = 0x0a; //ASCII Line Feed
jekain314 0:432b860b6ff7 14
jekain314 17:71900da6ced6 15 bool validMessage = false;
jekain314 17:71900da6ced6 16
jekain314 6:71da5b99de97 17
jekain314 0:432b860b6ff7 18 void readFromPC()
jekain314 0:432b860b6ff7 19 {
jekain314 6:71da5b99de97 20 // should this be a while rather than if ??? -- may have multiple bytes in buffer
jekain314 0:432b860b6ff7 21 if (toPC.readable()) //read a PC serial byte and test it for a command
jekain314 0:432b860b6ff7 22 {
jekain314 29:dead10cce6e9 23 // Read in next character
jekain314 29:dead10cce6e9 24 // why not read all available bytes
jekain314 1:8e24e633f8d8 25 unsigned char inChar = 0;
jekain314 6:71da5b99de97 26 inChar = toPC.getc(); //read char from the USB serial link to the PC
jekain314 0:432b860b6ff7 27
jekain314 0:432b860b6ff7 28 //incoming messages will end witb a CR / LF -- disregard these chars
jekain314 0:432b860b6ff7 29 if (inChar == CR || inChar == LF) return; //CR is a 0x0a
jekain314 0:432b860b6ff7 30
jekain314 29:dead10cce6e9 31 //all incoming messages will start with "mbedMessage", "messageType", numberDataBytes, and will end with CR & LF
jekain314 29:dead10cce6e9 32 //1) look for the mbedMessage and then get the next byte as numberDataBytes;
jekain314 29:dead10cce6e9 33 //2) read the next numberDataBytes and then look for CR & LF
jekain314 29:dead10cce6e9 34 //if 1) & 2) are successful, declare a valid incoming message
jekain314 29:dead10cce6e9 35 //if message is valid, then send a response as a repeat of the original message
jekain314 29:dead10cce6e9 36 //
jekain314 6:71da5b99de97 37
jekain314 0:432b860b6ff7 38 } //end pc.readable
jekain314 0:432b860b6ff7 39 };
jekain314 0:432b860b6ff7 40