using Wire1 on the core v 2.0.5 [probably needed to program the Artemis Global Tracker]

[jerabaul29]

I think (to be confirmed there by the experts :) ) that I need to be able to access specifically Wire1 to be able to use the GPS on the Artemis Global Tracker (see issue sparkfunX/Artemis_Global_Tracker#18 ).

In the core v 2.0.5, doing:

#include <Wire.h>

void setup(){
  Wire1.begin();
}

as was doable in the core v1 seems to be impossible:

exit status 1
'Wire1' was not declared in this scope

• any way to get this to work already in core v 2.0.5?
• if not, can this be fixed? Any timeline? I really need this fix badly, any "hack" that could make it work?

[jerabaul29]

Ok, looking here:

Arduino_Apollo3/libraries/Wire/src/Wire.h

Lines 68 to 85 in fbb2eac

	#if VARIANT_WIRE_INTFCS > 0
	extern arduino::MbedI2C Wire;
	#endif
	#if VARIANT_WIRE_INTFCS > 1
	extern arduino::MbedI2C Wire1;
	#endif
	#if VARIANT_WIRE_INTFCS > 2
	extern arduino::MbedI2C Wire2;
	#endif
	#if VARIANT_WIRE_INTFCS > 3
	extern arduino::MbedI2C Wire3;
	#endif
	#if VARIANT_WIRE_INTFCS > 4
	extern arduino::MbedI2C Wire4;
	#endif
	#if VARIANT_WIRE_INTFCS > 5
	extern arduino::MbedI2C Wire5;
	#endif

and there:

Arduino_Apollo3/libraries/Wire/src/Wire.cpp

Lines 161 to 178 in fbb2eac

	#if VARIANT_WIRE_INTFCS > 0
	arduino::MbedI2C Wire(VARIANT_Wire_SDA, VARIANT_Wire_SCL);
	#endif
	#if VARIANT_WIRE_INTFCS > 1
	arduino::MbedI2C Wire1(VARIANT_Wire1_SDA, VARIANT_Wire1_SCL);
	#endif
	#if VARIANT_WIRE_INTFCS > 2
	arduino::MbedI2C Wire2(VARIANT_Wire2_SDA, VARIANT_Wire2_SCL);
	#endif
	#if VARIANT_WIRE_INTFCS > 3
	arduino::MbedI2C Wire3(VARIANT_Wire3_SDA, VARIANT_Wire3_SCL);
	#endif
	#if VARIANT_WIRE_INTFCS > 4
	arduino::MbedI2C Wire4(VARIANT_Wire4_SDA, VARIANT_Wire4_SCL);
	#endif
	#if VARIANT_WIRE_INTFCS > 5
	arduino::MbedI2C Wire5(VARIANT_Wire5_SDA, VARIANT_Wire5_SCL);
	#endif

gives me good hope that this should be an easy fix.

[jerabaul29]

Ok, got some help on the tracker website, it should be possible to set up a I2C with custom pins, looking at it now.

[jerabaul29]

Ok, more problems coming up due to wrong pinmaps; taking the discussion on the Global Tracker issue though, feel free to help there.

[jry-slc]

This is probably another symptom of the same bug.
Echoing my post to the sparkfun forum: Home . SparkFun . Artemis . Artemis Arduino Core
Using Wire1 on Thing Plus

Editing variant.h will get the second I2C device created, and the Arduino IDE compiles and links. But now there's a runtime mbed-OS error
++ MbedOS Error Info ++
Error Status: 0x80010130 Code: 304 Module: 1
Error Message: pinmap not found for peripheral
Location: 0x26903
Error Value: 0x10
Current Thread: main Id: 0x10004C70 Entry: 0x28031 StackSize: 0x1000 StackMem: 0x100068F0 SP: 0x1000782C
For more info, visit: https://mbed.com/s/error?error=0x800101 ... THING_PLUS
-- MbedOS Error Info --

#if 1 // 2021-02-26 jry
#define VARIANT_WIRE_INTFCS 2
// Wire1 Pins
#define VARIANT_Wire1_SCL 17
#define VARIANT_Wire1_SDA 16
// end 2021-02-26 jry
#else // original
#define VARIANT_WIRE_INTFCS 1
#endif

[Wenn0101]

Alright. I went back thru the targets and added wire interfaces for some of the Wire interfaces that were labelled on the board but not defined in the software. This means that @jry-slc Wire1 should be available on the thing plus without you needing to define it yourself.

I wanted to clarify how to define a custom Wire when we don't have one defined on the pins you would like already.

#define mySDA \\YOUR PIN HERE
#define mySCL  \\YOUR PIN HERE
TwoWire myWire(mySDA, mySCL); 
//Name this anything you would like, myWire chosen in this example
//No need to change VARIANT_WIRE_INTFCS this is used internally when defining built in wire interfaces
//No need to use MbedI2C type, TwoWire will work
//Make sure to begin before using
void setup() {
  myWire.begin();
}