File content as of revision 9:b45feb91ba38:

#include "mbed.h" 
#include <string>

//set up the message buffer to be filled by the GPS read process
#define MODSERIAL_DEFAULT_RX_BUFFER_SIZE 256 

#include "MODSERIAL.h"
#include "SDFileSystem.h"      //imported using the import utility    

//general digital I/O specifications for this application
//SDFileSystem(PinName mosi, PinName miso, PinName sclk, PinName cs, const char* name);
SDFileSystem sd(p11,p12,p13,p14,"sd");
DigitalIn sd_detect(p27);
DigitalOut ppsled(LED1);        //blink an LED at the 1PPS
DigitalOut trig1led(LED2);      //blink an LED at the camera trigger detection
DigitalOut recordDataled(LED4); //set the led when the record is on
InterruptIn camera1Int(p30);    // camera interrupt in
DigitalOut camera2Pin(p29);     // We dont use the second camera interrupt
//USB serial data stream back to the PC
Serial toPC(USBTX, USBRX);      //connect the GPS TX, RX to p9 and p10

bool detectedGPS1PPS = false;       //flag set in the ISR and reset after processing the 1PPS event
int PPSCounter = 0;                 //counts the 1PPS occurrences
int byteCounter = 0;                //byte counter -- zeroed at 1PPS
unsigned short perSecMessageCounter=0; //counts the number of messages in a sec based on the header detection
bool lookingForMessages = true;     //set in the PPS ISR and set false after the message processing in the main
bool messageDetected = false;       //have detected a message header
unsigned long IMUbytesWritten = 0;  //counts the IMU bytes written by the fwrite() to the SD card 
int savedByteCounter = 0;           //save ByteCounter at the 1PPS for display in main
int savedPerSecMessageCounter=0;    //saved PerSecMsgCounter for display in main
int IMUClockCounter = 0;            //counter for IMU samples per sec
int savedIMUClockCounter=0;         //saved at the 1PPS for later diaplay from main
bool camera1EventDetected = false;  //flag from ISR indicating a clock event occurred
double camera1Time;                 //GPS time of the camera event 
int TotalBadCRCmatches = 0;         //counter for the bad CRC matches for all GPS messages

//////////////////////////////////////////////////////////////////////
// the below should become classes
//////////////////////////////////////////////////////////////////////
#include "OEM615.h"         //OEM615 GPS activities
#include "ADIS16488.h"      //ADIS16488 activities
#include "PCMessaging.h"    //PC messaging activities

//ISR for detection of the GPS 1PPS
void detect1PPSISR(void)
{
    timeFromPPS.reset();                    //reset the 1PPS timer upon 1PPS detection
    savedIMUClockCounter = IMUClockCounter; //number of IMU clocks received since last 1PPS
    savedByteCounter = byteCounter;         //save byteCounter for display in main
    savedPerSecMessageCounter = perSecMessageCounter;   //save for display un main
    IMUClockCounter = 0;                    //counts per-sec IMU samples (between 1PPS events)
    byteCounter = 0;                        //countes bytes between 1PPS events 
    perSecMessageCounter = 0;               //counts GPS messages between 1PPS events
    
    GPS_COM1.rxBufferFlush();               //flush the GPS serial buffer
    
    detectedGPS1PPS = true;         //set false in the main when 1PPS actions are complete
    lookingForMessages = true;      //set false in main after processing messages
    PPSCounter++;                   //count number of 1PPS epoch
    
    //note -- the below accounts for time information becoming available AFTER the 1PPS event
    PPSTimeOffset++;                //counts 1PPS events between matching POS and VEL messages
    
    ppsled = !ppsled;               //blink an LED at the 1PPS
};

//ISR for detection of the hotshoe trigger 1
void camera1ISR(void)
{
    //GPSTime is from POS message header
    //PPSTimeOffset is an even sec to account for Time becoming known AFTER the 1PPS
    //PPSTimeOffset + timeFromPPS.read() can be as large as 1.02 secs
    camera1Time = GPSTime + PPSTimeOffset + timeFromPPS.read();    
    camera1EventDetected = true;  //reset to false in main after processing the image detection
    trig1led = !trig1led;  //blink an LEWD at the camera event detection
};

///////////////////////////////////////////////////////
//set up the USB port and the GPS COM port
/////////////////////////////////////////////////////// 
FILE *fpNav = NULL;  //file pointer to the nav file on the SD card
void setupCOM(void)
{
    //system starts with GPS in reset active
    //dis-engage the reset to get the GPS started
    GPS_Reset=1; wait_ms(1000); 
    
    //establish 1PPS ISR 
    PPSInt.rise(&detect1PPSISR);
    
    //set the USB serial data rate -- rate must be matched at the PC end
    //This the serial communication back to the the PC host
    //Launch the C++ serial port read program there to catch the ASCII characters
    //toPC.baud(9600); wait_ms(100);    
    toPC.baud(8*115200); wait_ms(100);
    //toPC.baud(1*115200); wait_ms(100);
    toPC.printf("\n\n released GPS from RESET and set to high baud rate \n\n");
    
    //just wait to launch the GPS receiver
    for (int i=0; i<5; i++) { toPC.printf(" to start: %3d \n", 4-i); wait(1); }

    sd_detect.mode(PullUp);
    
    if (sd_detect == 0)
    {
        mkdir("/sd/Data", 0777);
    }
    else
    {
        toPC.printf(" SD card not present \n");
    }
    
    //NOTE:  we do not assume that the GPS receiver has been pre-set up for the WALDO_FCS functionality
    //we alwsys start with a reset and reprogram the receiver with our data out products
    // this prevents failure because of a blown NVRAM as occurred for the older camera systems
    
    //this is the COM1 port from th GPS receiuver to the mbed
    //it should be always started at 9600 baud because thats the default for the GPS receiver 
    GPS_COM1.baud(9600); wait_ms(100);
   
    // this ASCII command sets up the serial data from the GPS receiver on its COM1
    char ch7[] = "serialconfig COM1 9600 n 8 1 n off";
    // this is a software reset and has the same effect as a hardware reset (why do it?) 
    //char ch0[] = "RESET"; 
    //this command stops all communication from the GPS receiver on COM1
    //logs should still be presented on USB port so the Novatel CDU application can be used on the PC in parallel
    char ch1[] = "unlogall COM1";
    //set the final baud rate that we will use from here  
    //allowable baud rate values: 9600 115200 230400 460800 921600
    //char ch2[] = "serialconfig COM1 921600 n 8 1 n off";
    char ch2[] = "serialconfig COM1 115200 n 8 1 n off";
    
    //the below commands request the POS, VEL, RANGE, and TIME messages
    char ch3[] = "log COM1 BESTPOSB ONTIME 1";   //messageID = 42 
    char ch4[] = "log COM1 BESTVelB ONTIME 1";   //messageID = 99
    char ch5[] = "log COM1 RANGEB ONTIME 1";     //messageID = 43
    //char ch6[] = "log COM1 TIMEB ONTIME 1";      //messageID = 101
    
    //set up VARF to be 100Hz with 1X10^4 * 10^-8 = 10^-4 sec (10usec) pulse width
    //in fact, we do not use this output but it is available.
    //originally planned to use this to command the IMU data
    //char ch8[] = "FREQUENCYOUT enable 10000 1000000";
    
    toPC.printf("set serial config \n");
    sendASCII(ch7, sizeof(ch7)); wait_ms(500);
    //sendASCII(ch0, sizeof(ch0));  
    toPC.printf("unlog all messages \n");
    sendASCII(ch1, sizeof(ch1)); wait_ms(500);
    toPC.printf("log BESTPOSB on COM1 \n");
    sendASCII(ch3, sizeof(ch3)); wait_ms(500);
    toPC.printf("log BESTVELB on COM1\n");
    sendASCII(ch4, sizeof(ch4)); wait_ms(500);
    toPC.printf("log RANGEB on COM1\n");
    sendASCII(ch5, sizeof(ch5)); wait_ms(500);
    
    //toPC.printf("log TIMEB om COM1 \n");
    //sendASCII(ch6, sizeof(ch6)); wait_ms(100);
    
    //toPC.printf("Set up th VARF signal \n"); 
    //sendASCII(ch8, sizeof(ch8)); wait_ms(500);
       
    //set GPS output COM1 to the final high rate
    toPC.printf("set the COM ports to high rate\n");
    sendASCII(ch2, sizeof(ch2)); wait_ms(500);
    
    //set the mbed COM port to match the GPS transmit rate
    //the below baud rate must match the COM1 rate coming from the GPS receiver 
    GPS_COM1.baud(115200); wait_ms(500);  //without this wait -- the baud rate is not detected when using MODSERIAL     
    //GPS_COM1.baud(921600); wait_ms(500);  //without this wait -- the baud rate is not detected when using MODSERIAL     
};

void setupTriggers()
{
    camera1Int.mode(PullUp);
    camera2Pin = 1;
    //establish Trigger ISR 
    camera1Int.rise(&camera1ISR);
    
};

/////////////////////////////////////////////////////////////////////
//  mbed main to support the Waldo_FCS
/////////////////////////////////////////////////////////////////////
int main() {
    
    //these are structures for the to GPS messages that must be parsed
    MESSAGEHEADER msgHdr;
    OEM615BESTPOS posMsg;   //BESTPOS structure in OEMV615.h that has matching time to a BESTVEL message
    OEM615BESTPOS curPos;   //BESTPOS structure in OEMV615.h
    OEM615BESTVEL velMsg;   //BESTVEL structure in OEMV615.h that has matching time to a BESTPOS message
    OEM615BESTVEL curVel;   //BESTVEL structure in OEMV615.h

    //set up the GPS and mbed COM ports
    setupCOM(); 
    
    //set up the ADIS16488 
    setupADIS();
    
    //setup Hotshoe
    setupTriggers();

    setUpMessages();  //set up the expected text message commands frm the PC 
    
    //set up the interrupt to catch the GPS receiver serial bytes as they are presented
    GPS_COM1.attach(&readSerialByte, MODSERIAL::RxIrq);
    
    timeFromPPS.start();  //start the time for measuring time from 1PPS events
    
    toPC.printf("\n\n top of the main loop \n\n");
    
    int totalBytesWritten = 0;
    
    /*
    unsigned long CRC = 0;
    CRC32Value(CRC, 0xAA);
    CRC32Value(CRC, 0x44);
    CRC32Value(CRC, 0x12);
    CRC32Value(CRC, 0x1C);
    toPC.printf(" CRC after AA44121C header: %08x \n", CRC);
    wait(20);
    */
    
    int CRCerrors = 0;
    
    recordData = true;
    sendRecData = true;                     
    
    while(PPSCounter < 300)
    ///////////////////////////////////////////////////////////////////////////
    // top of the while loop
    ///////////////////////////////////////////////////////////////////////////
    //while(1)
    {        
        //read the USB serial data from the PC to check for commands
        //in the primary real-time portion, there are no bytes from the PC so this has no impact
        readFromPC();
                
        processPCmessages(fpNav, posMsg, velMsg);

//
        ////////////////////////////////////////////////////////////////////////////
        //below is where we process the complete stored GPS message for the second
        //The !IMUDataReady test prevents the IMU and GPS data from being written 
        //to disk on the same pass through this loop  
        /////////////////////////////////////////////////////////////////////////////
        
        
        if (completeMessageAvailable && !IMUDataReady)
        {
            
            msgHdr = *((MESSAGEHEADER*)&msgBuffer[messageLocation[savedMessageCounter-1]]);
            
            GPSTimemsecs = msgHdr.GPSTime_msecs;
            /////////////////////////////////////////////////////////////////////////////////////////
            //IMPORTANT:   we reset the PPSTimeOffset when we have a matching position and velocity 
            PPSTimeOffset = 0;
            /////////////////////////////////////////////////////////////////////////////////////////
            
            unsigned long msgCRC = *((unsigned long*)&msgBuffer[messageLocation[savedMessageCounter-1] + 28 + msgHdr.messageLength]);
            
            //toPC.printf("tmeFrom1PPS= %5d  ID= %3d Ln = %3d computedCRC= %08x msgCRC= %08x msgCntr = %3d CRCerr=%4d\n", 
            //    timeFromPPS.read_us(), msgHdr.messageID, msgHdr.messageLength, computedCRC, msgCRC, savedMessageCounter, TotalBadCRCmatches);
                
            if ( msgCRC != computedCRC)
            {
                toPC.printf(" bad CRC match for messageID %3d total CRC errors = %4d \n",  
                    msgHdr.messageLength, TotalBadCRCmatches++);
            }
                     
            if      (msgHdr.messageID == 42)
            {
                curPos = *((OEM615BESTPOS*)&msgBuffer[messageLocation[savedMessageCounter-1]]);
                posMsg = curPos;
                
                if (streamPos)
                {
                        toPC.printf("WMsg BESTPOS %5d %1d %8.5lf %9.5lf %5.3lf %d %d %d\n",
                                          curPos.msgHeader.GPSTime_msecs,  curPos.solStatus,
                                          curPos.latitude, curPos.longitude, curPos.height,
                                          curPos.numSV, curPos.numSolSV, curPos.numGGL1);
                }
                
                /////////////////////////////////////////////////////////////////////////////////////////
                //IMPORTANT:   we reset the PPSTimeOffset when we have a matching position and velocity 
                PPSTimeOffset = 0;
                /////////////////////////////////////////////////////////////////////////////////////////
            } 
            else if (msgHdr.messageID == 99)  
            {
                curVel = *((OEM615BESTVEL*)&msgBuffer[ messageLocation[savedMessageCounter-1] ]);
                velMsg = curVel;
            }
            
            if (recordData && (fpNav != NULL) && (byteCounter > 0))
            {
                //wait_us(10);
                int totalMessageLength = 28 + msgHdr.messageLength + 4;  //header length + message Length + CRC word size
                totalBytesWritten += fwrite(&msgBuffer[messageLocation[savedMessageCounter-1]], 1, totalMessageLength, fpNav);  // this writes out a complete set of messages for this sec
                //wait_us(10);
            }
                
            completeMessageAvailable = false;
        }
        
        //the IMU data record is read from the SPI in the ISR and the IMUDataReady is set true
        //we write the IMU data here
        if (IMUDataReady)  //IMUDataReady is true if we have a recent IMU data record
        {
            //GPSTime (secs from midnight) is from the header of the position message
            //PPSTimeOffset accounts for time becoming known ~20msec AFTER the 1PPS
            IMUtimeFrom1PPS = timeFromPPS.read_us();
            imuRec.GPSTime = GPSTimemsecs + PPSTimeOffset*1000 + IMUtimeFrom1PPS/1000.0;
            //wait_us(1);
            spi.write((int) HIGH_REGISTER[0]); //wait_us(1); // next read will return results from HIGH_REGITER[0]
            for (int i=0; i<6; i++)  //read the 6 rate and accel variables
            {
                wd.pt[1] = (unsigned short)spi.write((int) LOW_REGISTER[i]); //wait_us(1) ; 
                if (i<5)  // dont this on the last because this was pre-called
                {   wd.pt[0] = (unsigned short)spi.write((int) HIGH_REGISTER[i+1]);  }
                imuRec.dataWord[i] = wd.dataWord; //data word is a signed long
            }
            IMURecordCounter++;
            //write the IMU data
            if (recordData && (fpNav != NULL))
            {   
                totalBytesWritten += fwrite(&imuRec, 1, sizeof(IMUREC), fpNav);
            }
            IMUDataReady = false;
        }
        
        if (camera1EventDetected)  //we have detected a camera trigger event
        {
            toPC.printf("WMsg TRIGGERTIME %5.3lf\n", camera1Time);
            camera1EventDetected = false;
        }
        
        if (detectedGPS1PPS)  //true if we are exactly at a 1PPS event detection
        {   
            toPC.printf("\n PPSCounter=%4d byteCounter=%10d Msgs Received=%3d IMUClock=%4d IMURec = %3d bytesWritten=%8d\n", 
                            PPSCounter, savedByteCounter, savedPerSecMessageCounter, savedIMUClockCounter, IMURecordCounter, totalBytesWritten);
            
            IMURecordCounter = 0;
            detectedGPS1PPS = false;
        }
    }
      
    fclose(fpNav);
    toPC.printf(" normal termination \n");
}