M2RET with GPS receiver (26 pin connector)

albal13 · October 31, 2017, 8:22pm

I am trying to connect a GPS sensor in M2 and read the CAN data using M2RET and SavvyCan. I have added the GPS module into M2RET and successfully compiled and uploaded the modified M2RET to M2.

Then, no COM port showing for M2 and it cannot connect with SavvyCan anymore. It says USB devise not recognized.

I have used the following code for the Adafruite GPS receiver (Serial3 is used):

github.com

adafruit/Adafruit_GPS/blob/master/examples/due_parsing/due_parsing.ino

// Test code for Adafruit GPS modules using MTK3329/MTK3339 driver
//
// This code shows how to listen to the GPS module in an interrupt
// which allows the program to have more 'freedom' - just parse
// when a new NMEA sentence is available! Then access data when
// desired.
//
// Tested and works great with the Adafruit Ultimate GPS module
// using MTK33x9 chipset
//    ------> http://www.adafruit.com/products/746
// Pick one up today at the Adafruit electronics shop 
// and help support open source hardware & software! -ada

#include <Adafruit_GPS.h>

// This sketch is ONLY for the Arduino Due!
// You should make the following connections with the Due and GPS module:
// GPS power pin to Arduino Due 3.3V output.
// GPS ground pin to Arduino Due ground.
// For hardware serial 1 (recommended):

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josh · October 31, 2017, 8:27pm

Could you also post the modified M2RET code?

albal13 · November 1, 2017, 1:14am

Here is the link of my code:
https://drive.google.com/file/d/0B3tdiSZ9hBj4RmpQTFF3Q2lkTEU/view?usp=sharing

Additional lines are enclosed between “//GPS signal” marks. I mostly change four parts: initialize several stuffs (setup() function), update and print GPS signal into the serial monitor (loop() function), planning to write GPS signal values into a file (sendFrameToFile() function), and define a serial port and a user-defined interrupt (outside).

I am wondering if it has something wrong with Serial or Serial3. My guess is USB port stops working after uploading my code to M2.