NuttX-5.1

This is the 48th release of NuttX. This release adds support for two new MCU architectures in various states of development:

• AT91SAM3U (http://www.atmel.com/products/at91/sam3landing.asp?family_id=605)

This release adds support for the SAM3U-EK development board with the AT91SAM3U4E MCU (http://www.atmel.com/dyn/products/product_card_mcu.asp?part_id=4562). As with most NuttX architecture releases, the release will be rolled out in two parts: A basic port and an extended port.

NuttX-5.1 includes the basic port for the SAM3U-EK board. This release passes the NuttX OS test and is proven to have a valid OS implementation. It supports the basic boot-up, serial console and timer interrupts. A configuration to support the NuttShell is also included.

The extended port will also include support for SDIO-based SD cards and USB device (and possible LCD support). These extensions may or may not happen by the NuttX 5.2 release as my plate is kind of full now.

• LPC3131 (http://ics.nxp.com/products/lpc3000/lpc313x.lpc314x.lpc315x/)

This release also adds the complete implementation of the basic port for the NXP LPC3131 MCU on the Embedded Artists EA3131 board (http://www.embeddedartists.com/products/kits/lpc3131_kit.php). That port, unfortunately has stalled due to tools issues. Those tool issues have been resolved and I am confident that the verified basic port will be available in NuttX-5.2.

The extended release will follow and should include SDIO-based SD card support and device USB.

A few additional features and bugfixes of a minor nature were also incorporated as detailed in the ChangeLog.