Datasheet

byte location) will cause a Hard Fault and stop the MCU. Thankfully, there's an easy work

around ... just use memcpy!

uint8_t mybuffer[4];

float f;

memcpy(f, mybuffer, 4)

Floating Point Conversion

Like the AVR Arduinos, the M0 library does not have full support for converting floating point

numbers to ASCII strings. Functions like sprintf will not convert floating point. Fortunately,

the standard AVR-LIBC library includes the dtostrf function which can handle the conversion

for you.

Unfortunately, the M0 run-time library does not have dtostrf. You may see some references

to using #include <avr/dtostrf.h> to get dtostrf in your code. And while it will compile, it does

not work.

Instead, check out this thread to find a working dtostrf function you can include in your code:

http://forum.arduino.cc/index.php?topic=368720.0

How Much RAM Available?

The ATSAMD21G18 has 32K of RAM, but you still might need to track it for some reason. You

can do so with this handy function:

Thx to http://forum.arduino.cc/index.php?topic=365830.msg2542879#msg2542879 for the

tip!

Storing data in FLASH

If you're used to AVR, you've probably used PROGMEM to let the compiler know you'd like

to put a variable or string in flash memory to save on RAM. On the ARM, its a little easier,

extern "C" char *sbrk(int i);

int FreeRam () {

char stack_dummy = 0;

return &stack_dummy - sbrk(0);

}