Printf causes random hard faults

[timboldt]

I discovered that trying to print floating point numbers results in random hard faults, on a Feather M0.

For example, this was problematic:

tinyfont.WriteLine(&display, &proggy.TinySZ8pt7b, 0, 6, []byte(
fmt.Sprintf("%.1f'C %.2f V",
temperature,
batteryVoltage)),
color.RGBA{255, 255, 255, 255})

Context:
https://github.com/timboldt/epaper-display/blob/e5169a18099b5f1563cbaab0452d9a360fa76351/main.go
TinyGo version: tinygo version 0.13.1 linux/amd64 (using go version go1.14.3 and LLVM version 10.0.1)
Hardware: Adafruit Feather M0 Express

[niaow]

I think this might be fixed by #1105 which is currently on dev? I will look into this later today.

[timboldt]

I had thought so at first too, but the Feather M0 doesn't have an FPU.

[deadprogram]

Is this still an issue with the current dev branch?

[bgould]

I tested the sample program using Feather M0, and the issue appears to be fixed. Program runs indefinitely without panic. Closing out as fixed. Thank you!