Atmel SAM D20

[tszaboo]

Hello,
I'm planning to use one of the Atmel SAM D20/D21 MCU in an upcoming project. I dont have any experience with Atmel's ARM products, nor with the M0+. It is considered because the communication interfaces, there should be a lot of separate SPI, DMA between them, and this is the cheapest with lot of SPI.
Did anyone use them before? What is the experience with them? Am I missing something, or it doestn have a ROM bootloader so you need ISP to program them after manufacturing? Is the Atmel studio a good software environment? The last time I worked with Atmel, it was a 8 bit AVR six years ago... Thanks for taking your time to reply!

[Spikee]

The new unreleased Arduino Zero is using the Atmel SAM D21 zo it should be a pretty good chip.
I have used AVR studio quite a lot and I must say that it is a pretty good IDE for programming. No major issues with it tbh.
You can put a bootloader on the chip to program it via usb or whatever. But ISP also works.

[tszaboo]

I usually prefer ROM UART bootloaders, because that makes production programming much easier. With a "bed of nails tester" when you have to integrate a third party production programmer for the ISP, it becomes a mess.

[Spikee]

I usually prefer ROM UART bootloaders, because that makes production programming much easier. With a "bed of nails tester" when you have to integrate a third party production programmer for the ISP, it becomes a mess.

It should all be possible