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SAM V71 Xplained Ultra Evaluation Kit examples

This crate provides HAL usage examples for working with the SAM V71 Xplained Ultra Evaulation Kit. The examples are written in RTIC.

Prerequisites

  • Install the cross-compilation toolchain: rustup target add thumbv7em-none-eabihf.
  • Install cargo-embed: cargo install cargo-embed.

Flashing an example

First, the General-Purpose Non-Volatile-Memory (GPNVM) boot bit must be set in order to map the flashed firmware to address 0x0; required for the interrupts and software resets to work as expected:

  1. Connect the board via the "Debug USB" port and run 
    $ openocd -f openocd.cfg -c "atsamv gpnvm set 1" -c exit
  2. Power-cycle the board, and the verify with 
    $ openocd -f openocd.cfg -c "atsamv gpnvm show 1" -c exit
[...]
samv-gpnvm1: 1

The examples can now be flashed and run. For example:

$ cargo embed --example blinky

Erasing bad firmware

In case the board has been flashed with software that sets it in a bad state before the debugger can attach, bridge the "ERASE" header (J400; north of the MCU) between power cycles, and remove the bridge. The flash area has now been zeroed.