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How connect the gps module to Arduino?  Arduino -> secound Arduino -> GPS-Module

What steps will reproduce the problem?
1. find string in I2C_GPS_NAV_v2_2
if (string[0] == 'G' && string[1] == 'P' && string[2] == 'G' && string[3] == 
'S' && string[4] == 'A') gps_frame = GPGSA_FRAME;
2. replace it to
if (string[0] == 'G' && (string[1] == 'P' || string[1] == 'N') && string[2] == 
'G' && string[3] == 'S' && string[4] == 'A') gps_frame = GPGSA_FRAME;

What is the expected output? What do you see instead?
After this my quectel l16 work nice.

What version of the product are you using? On what operating system?
I2C_GPS_NAV_v2.2Beta1-r62
Gps module quectel L16 on STM TESEO II chipset.

What steps will reproduce the problem?

1. if (offset < 15)
                    string[offset++] = c;

the next character received is a '*', or ',' then there is a write outside the 
array boundaries:

case ',':
case '*':
          string[offset] = 0;

Version 22 used.

Either change the array size or if (offset < 15) to if (offset < 14)

I have a test environment setup using a 4800 baud GPS to one Arduino. I have 
the two arduinos SDA, SLC and ground connected and made sure they were talking 
with each other using the IDE master/slave examples. 

Problem, I am receiving tons of I2C errors and the Wii GUI is not reporting any 
information about the GPS such as SAT found etc.

I modified the following sketch to see of the MWC was sending the request but 
it appears the MWC is not receiving an answer back generating massive number of 
I2C bus errors.

#include <Wire.h>

void setup()
{
  Serial.begin(115200);  // start serial for output
  Wire.begin(0x20);                // join i2c bus with address #2
  Wire.onRequest(requestEvent);          // Set up event handlers
  Wire.onReceive(receiveEvent);
}

void loop()
{
  delay(100);
}

// function that executes whenever data is requested by master
// this function is registered as an event, see setup()
void requestEvent()
{
  Serial.println("Request "); // respond with message of 6 bytes
                       // as expected by master
}

void receiveEvent(int bytesReceived)
{
  int a = Wire.read();
  Serial.print("Received "); // respond with message of 6 bytes
                       // as expected by master
  Serial.print(a);
}

What steps will reproduce the problem?
1. crius i2c Nav v 1.1 want communicat


What is the expected output? What do you see instead?

in multiwiiConf i get i2c error's from -thousand to +thousand


What version of the product are you using? On what operating system?

crius Multiwii Se v2.5 +  crius i2c nav v1.1 + crius neo-6 gps 


Please provide any additional information below.
if i connect neo-6 gps alone to ftdi i get in u center8.13 signal and fix
if i connect multiwii and i2c with gps the i2c nav v1.1 board flash solid 
1sec/1sec

tried out nav2.2 beta r62 with newest multiwii 
gps runs with NMEA Protokoll tried with a blox but than i get no signals from 
SAT and no FIX

Attached a patch that adds native NMEA support.
The three sentences can be received from register 241. Register 240 presents 
the length of data available.

I use it for exchanging an old serial GPS in a design that supports I2C as 
well. Of course a ublox receiver might be connected directly, but for 25 Euros, 
it is impossible to create a board with level shifters and cables etc.

What steps will reproduce the problem?
1. Position Hold at North-northeast (copter was about 10m away from home).
2. RTH turned on.
3. copter moved like arc.

What is the expected output? What do you see instead?
 copter will move straight. 

What version of the product are you using? On what operating system?
 I2C_GPS_NAV 2.1 ,MultiWii 2.1 (may be r1311) ,Win7

Please provide any additional information below.
 I2C_GPS_NAV.ino
  #1318   i2c_dataset.home_to_copter_bearing = GPS_bearing(...)
 will overflow? when GPS_bearing() > about 328deg

Sorry I'm not good at english.

In the I2C GPS register definitions, the address for I2C_GPS_GROUND_COURSE 
should be 0x9D instead of 0x9C.

I had some trouble with my Ultrasonic sensor not able to get a reading. It's 
like my sensor would crash sometimes but if I pulsed the line again I would get 
a reading.

I made a small change to the sonar_update function such that if no state change 
was received, it would reset and try again. Seemed to fix my problem.

void Sonar_update()
{

#if !defined(MAXBOTIX_PWM)

  if (Sonar_waiting_echo == 0)
  {
    // Send 2ms LOW pulse to ensure we get a nice clean pulse
    PORTC &= ~(0x08);//PC3 low    
    delayMicroseconds(2);

    // send 10 microsecond pulse
    PORTC |= (0x08);//PC3 high 
    // wait 10 microseconds before turning off
    delayMicroseconds(10);
    // stop sending the pulse
    PORTC &= ~(0x08);//PC3 low

    Sonar_waiting_echo = 1;

  // We never got a signal pulse back for some reason
  // We should have a pulse of up to 36 mS if nothing detected
  } else if((micros() - Sonar_starTime) > 50000) { 
    Sonar_waiting_echo = 0;
  }
#endif
}
#endif

What steps will reproduce the problem?
1. Configure the sketch to use NMEA and INIT_MTK_GPS
2. Wait for the GPS 3D fix

What is the expected output? What do you see instead?
It is expected that 3D fix will be achieved (3 blinks) after the GPS sees 
enough satellites, but 3D fix state is never reached.

What version of the product are you using? On what operating system?
I2C_GPS_NAV_v2.2Beta1-r62.rar

Please provide any additional information below.
Looks like the problem is caused by the fact that the GPGGA sentences are 
disabled when INIT_MTK_GPS autoconfiguration is used. Given the 3D fix state 
changes only as a result of parsing the GPGSA sentence this will never happen.

I believe the solution for that is changing the MTK init command
#define MTK_SET_NMEA_SENTENCES  
"$PMTK314,0,1,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0*28\r\n"

to 

#define MTK_SET_NMEA_SENTENCES  
"$PMTK314,0,1,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0*29\r\n"

This will make the arduino set the GPS receiver to 57600baud 10Hz every time 
the arduino starts:

////////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////
// Setup
//
void setup() {

  uint8_t i;

  //rctimer CN-06 gps receiver
  delay(1000); //give the GPS receiver time to boot
  Serial.begin(9600);
  byte gps10hz[] = {0xB5,0x62,0x06,0x08,0x06,0x00,0x64,0x00,0x01,0x00,0x01,0x00,0x7A,0x12,0xB5,0x62,0x06,0x08,0x00,0x00,0x0E,0x30};
  Serial.write(gps10hz,22);
  delay(500); //give the GPS receiver time to process
  byte baudrate57600[] = {0xB5,0x62,0x06,0x00,0x14,0x00,0x01,0x00,0x00,0x00,0xD0,0x08,0x00,0x00,0x00,0xE1,0x00,0x00,0x07,0x00,0x07,0x00,0x00,0x00,0x00,0x00,0xE2,0xE1,0xB5,0x62,0x06,0x00,0x01,0x00,0x01,0x08,0x22};
  Serial.write(baudrate57600,37);
  Serial.end();

NOTE: 
1. may also work for other u-blox based GPS receivers
2. works by sending UBX config messages that would otherwise be sent by an 
application like u-center

What steps will reproduce the problem?
1. Can't initialize ublox
2.
3.

What is the expected output? What do you see instead?


What version of the product are you using? On what operating system?


Please provide any additional information below.
Hi EOSbandi, recently I used your 2.2 beta release. can't initialized ublox GPS.
I guess Serial.write(PSTR("xxxxx")); can't be used.
maybe need some pgm_read_byte ?

thanks

What steps will reproduce the problem?
1. can't get GPS fix on multiwii
2.
3.

What is the expected output? What do you see instead?
i2c error 36

What version of the product are you using? On what operating system?
multiwii sketch v2.3
I2C_GPS_NAV_v2.2Beta1-r62
Ucenter

Please provide any additional information below.
all is compiled
Neo 6 gets a gps fix (greenled)
i2c only blinks one time
MW conf gets one i2c error (count 36)

i2c address is default