linker ⁽¹⁾

Choosing a Dev KitThe nRF51 is recent enough to be supported by a mature development environment and to have lots of others try it out before me. The Development Kit comes in a handy sized board which only needs micro USB for power and data, and has a built in SEGGER JLink debug chip, as well as 4 user buttons and LEDs, and all the usual ports. It uses the nRF51422 which is Cortex M0 based, so I thought it would be a good way to do some M0 development work. In comparison, the later nRF52 series are M4 based, more capable but more expensive. I decided I didn't need the feature of the nRF52/Cortex M4, which was my first mistake. Nordic's Getting Started Guide v1.3, which covers the nRF51 DK, recommends Segger SES as the preferred development enviroment and is supported by Nordic. While they also provide support for Keil, IAR, and GNU/GCC, the agreement with Segger is that they will licence it for free for use with Nordic chips. Since the nRF51-DK comes with a Segger J-Link debugger chip built in and I had previously noted that Segger seemed to be one of the premium brands for ARM Cortex…