Hey there!

It sounds like your Mac is having an issue recognizing your USB cable, did you check out the Port Trouble blog we have? Here it is: https://tinycircuits.com/blogs/learn/port-trouble-windows-and-mac-help so maybe you can find which port it is with some plugging and unplugging! 

This is a common issue among Mac users (myself included), so if that blog doesn't help, you may have to due some scanning for your USB connections. Here's a snippet from a post on the arduino forum:
"As already noted this is an OS problem. The port should appear (only when the Arduino is physically connected) as a pair of files /dev/tty.usbmodemXYZ and /dev/cu.usbmodemXYZ. The IDE gets its list of available ports from the OS.

There are utilities that may help your diagnosis, perhaps the standard Utility->Console will show some meaningful error message when you connect the Arduino. USB Prober is a dedicated tool available from the Mac developer site, and you may find downloadable copies around. I'm saying this because *apparently* some people solved their "device not recognized" problems just by running a low-level usb analyzer (). I would also get rid of the FTDI drivers, just in case.

I run OSX 10.6.8 on a MBPro and have the same Vendor/Product/Version IDs, never had similar problems so far."
- https://forum.arduino.cc/index.php?topic=150734.0

This post is a few years old but it might be worth reading through!

Hello,
I have made the code run using a windows computer.
However, when I turned on the serial monitor and followed the steps, instead of giving me NMEA data, it just says "No available data."

Another issue is when I try to unplug it from the micro USB cable and try to make it work with the battery, it does not provide a light when I switch it on. I think it that it should.

Many thanks

Hello DimSim,

Have you written to the GPS module before trying to read from it? If there is no data previously written to it, there should not be anything to read off of the module.

Otherwise, the "No available data" message you're getting could be due to some incorrect addressing in the program. I took a look at the SPIFlash library that is necessary for this tutorial, and it has been renamed to "SPIFlash Memory." There are a few other SPIFlash libraries, so first make sure you have the correct version by Prajwal Bhattaram.

The yellow light that you see on on the TinyDuino when it is plugged into USB is the charging light for the battery, so when the USB is removed from the hardware, there should be no light on besides the green LED flashing every ten seconds on P13 while the GPS is in write mode.

Please let me know if that helps!

Thank you,
Réna

Hello,
I have downloaded the library from this site: https://forum.arduino.cc/index.php?topic=324009.0
I downloaded the SPIFlash-2.60 version. Please tell me if this is the wrong version to download for the project.
Thanks

Hello,

I downloaded the most recent version of the library (3.2.1) and was able to work through the tutorial successfully. The tutorial also works with the older version used in the tutorial.

Did you make any changes to the program? Are you still encountering the "No available data" message after allowing the GPS to write values?

Best of luck,
Réna

Hello,
It finally works after lots of effort.
Thanks for your help

I'm glad everything's working now!