Microchip SAM34

Microchip SAM3U

This port uses the Microchip SAM3U-EK development board that features the SAM3U4E MCU. This port uses a GNU arm-nuttx-elf or arm-nuttx-eabi toolchain* under either Linux or Cygwin (with native Windows GNU tools or Cygwin-based GNU tools).

Development Environments: 1) Linux with native Linux GNU toolchain, 2) Cygwin/MSYS with Cygwin GNU toolchain, 3) Cygwin/MSYS with Windows native toolchain (CodeSourcery or devkitARM), or 4) Native Windows. A DIY toolchain for inux or Cygwin is provided by the NuttX buildroot package.

Microchip SAM3X

There are two SAM3X boards supported:

The Arduino Due development board that features the ATSAM3X8E MCU running at 84MHz. See the Arduino Due page for more information.
The Mikroelektronika Flip&Click SAM3X development board. This board is an Arduino Due work-alike with additional support for 4 mikroBUS Click boards.

Development Environments: See the Microchip SAM3U discussion above.

Microchip SAM4L

This port uses the Microchip SAM4L Xplained Pro development board. This board features the ATSAM4LC4C MCU running at 48MHz with 256KB of FLASH and 32KB of internal SRAM.

STATUS: As of this writing, the basic port is code complete and a fully verified configuration exists for the NuttShell NSH). The first fully functional SAM4L Xplained Pro port was released in NuttX-6.28. Support for the SAM4L Xplained modules was added in NuttX-6.29:

Support for the SPI-based SD card on the I/O1 module.
Driver for the LED1 segment LCD module.
Support for the UG-2832HSWEG04 OLED on the SAM4L Xplained Pro’s OLED1 module

Refer to the NuttX board README file for further information.

Memory Usage. The ATSAM4LC4C comes in a 100-pin package and has 256KB FLASH and 32KB of SRAM. Below is the current memory usage for the NSH configuration (June 9, 2013). This is not a minimal implementation, but a full-featured NSH configuration.

Static memory usage can be shown with size command:

NuttX, the NSH application, and GCC libraries use 42.6KB of FLASH leaving 213.4B of FLASH (83.4%) free from additional application development. Static SRAM usage is about 2.3KB (<7%) and leaves 29.7KB (92.7%) available for heap at runtime.

SRAM usage at run-time can be shown with the NSH free command. This runtime memory usage includes the static memory usage plus all dynamic memory allocation for things like stacks and I/O buffers:

You can see that 22.8KB (71.1%) of the SRAM heap is still available for further application development while NSH is running.

Microchip SAM4CM

General architectural support was provided for SAM4CM family in NuttX 7.3 This was architecture-only support, meaning that support for the boards with these chips is available, but no support for any publicly available boards was included. The SAM4CM port should be compatible with most of the SAM3/4 drivers (like HSMCI, DMAC, etc.) but those have not be verified on hardware as of this writing. This support was contributed in part by Max Neklyudov.

Microchip SAM4CMP-DB. Support for the SAM4CMP-DB board was contributed to NuttX by Masayuki Ishikawa in NuttX-7.19. The SAM4CM is a dual-CPU part and SMP was included for the ARMv7-M and SAM3/4 families. The SAM4CMP-DB board support includes an NSH configuration that operates in an SMP configuration. Refer to the NuttX board README file for further information.

Microchip SAM4E

General architectural support was provided for the SAM4E family in NuttX 6.32. This was architecture-only support, meaning that support for the boards with these chips is available, but no support for any publicly available boards was included. This support was contributed in part by Mitko.

Microchip SAM4E-EK. Board support was added for the SAM4E-EK development board in NuttX 7.1. A fully functional NuttShell (NSH) configuration is available (see NSH). That NSH configuration includes networking support and support for an AT25 Serial FLASH file system.

Microchip SAM4S

There are ports to two Microchip SAM4S board:

There is a port the Microchip SAM4S Xplained development board. This board features the ATSAM4S16 MCU running at 120MHz with 1MB of FLASH and 128KB of internal SRAM.
There is also a port to the Microchip SAM4S Xplained Pro development board. This board features the ATSAM4S32C MCU running at 120MHz with 2MB of FLASH and 160KB of internal SRAM.

Microchip SAM4E. General architectural support was provided for the SAM4E family in NuttX 6.32. This was architecture-only support, meaning that support for the boards with these chips is available, but no support for any publicly available boards was included. This support was contributed in part by Mitko.