![]() Test Pads on the SparkFun SAMD51 Thing Plus Board It should only take a few seconds to program, but might be tricky and require an extra pair of hands. Programming these might be a bit trickier without a jig, but I recommend holding a pair of jumper wires against the pads while uploading. There is at least one test point on all our boards since we program the boards after they are assembled and need access to them. On other boards such as the ProRF or the SAMD51 Thing Plus you may have to dig into the schematic or board files to find the test points. 10 Pin Headers on Various SparkFun Boards You will probably want a 2x5 header to connect the cable to the board (you can either solder it on, or hold it on securely while programming). If you check the pinout above you'll notice that the notch goes on the same side as pin 1. Our footprint shows a small dash where pin 1 goes. On some of our larger boards, like the SAMD21 Dev board and the RedBoard Turbo, we managed to get the full 10 pin header. We will need to make sure that SWCLK and SWDIO are both connected to the microcontroller. The SAMD21 is an ARM Cortex-M0, where the SAMD51 is an ARM Cortex-M4F. All that to say that we are going to be looking at programming the SamD21 on our Redboard Turbo (and other boards) as well as the SamD51 on the Thing Plus. The Cortex M0/M0+ and M1 are actually from the v6 architecture and can be considered a subset for the v7 profile. The v7 architectures lists 3 different profiles: If you look around you'll actually see quite a few naming conventions. They can license the core, maximize power efficiency, add some silicone for the camera sensor interface, and build the entire system onto a chip. A company might decide they want to build a camera that uses the ARM core. The cores are then put into CPUs, microcontrollers, SOCs (System on Chip), etc. Arm Holdings does the design work for the cores and holds the patents/copyright/other legal things and then licenses the design out. They are used in everything from the Redboard Turbo to the Raspberry Pi to most cellphones, but that's a large range of performance. Let's start with what an ARM processor is. You still need to add a bootloader to use them with Arduino, and since ARM programmers are also a little more complicated than AVR programmers you'll want to invest in a stand alone programmer instead of trying to use the Uno you have laying around. One advantage of the newer chips is that they generally do not need a USB-to-serial adapter instead they have USB built in (at least the ones we are using do). But now the market is maturing and we are looking at a lot more ARM chips. We've programmed ATMega328s (and 168s, and 8s before that), written tutorials, and hacked all sorts of fun projects. SparkFun has been a fan of Arduino for a long time. Installing an Arduino Bootloader tutorial. ![]() If you are using an AVR microcontroller with an Arduino bootloader using ICSP pins, you'll need to head on over to the J-Link EDU Mini or J-Link EDU Base) to connect to the port. You will need a dedicated programmer (i.e. Heads up! This tutorial was written for ARM microcontrollers with SWD or JTAG pins.
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