The uIP TCP/IP stack for the web platform now lists and reads files from an SD card.

You can now read files and list directories from the SD card.

There’s also a ’sddump’ command that will dump sectors from the sd card in the same way that  memdump dumps memory, for troubleshooting.

The latest uIP port source is in the SVN. Previous updates here.

Seeed is making a small second batch of web platforms. You can probably backorder one at Seeed, they should be available in a few weeks.

There’s some new features in  Bonybrown’s  uIP TCP/IP stack project for the web platform. Some notable changes are:

• The code runs 3 “tasks” that it multitasks between. One for the IP stack, one for the serial port (debugging help) and another for a handler for telnet (port 23).
• The telnet server task is pretty easily extendable
• It should be reasonably easy to write a web server task now, but without the ability to read files, you can’t serve much

We’ll be using the open source uIP stack port in all our future networked projects, it solves the licensing issues with Microchip’s non-distributable code. The uIP port doesn’t have as many features as the Microchip stack, yet, but it’s already a viable alternative for us. Most of our projects, like the #twatch and @tweet_tree, just use a simple TCPIP client.

The latest uIP port source is in the SVN. Previous updates here.

Seeed is making a small second batch of web platforms. You can probably backorder one at Seeed, they should be available in a few weeks.

Another update on the uIP TCP/IP stack port for the web platform. Bonybrown has added even more features:

Periodic uIP processing now works, driven from RTCC alarm interrupt  (500mS). Added start for simple round-robin co-operative task switcher.

Latest code is in the SVN. Previous updates here.

Here’s another update on the uIP TCP/IP stack port for the web platform. Bonybrown got the uIP stack to work with interrupts from the ENC28J60, and used DMA to transfer buffers to PIC memory.

Performance wise – no real difference I can see from the ping times; theoretically, the biggest improvement will be in “responsiveness” of other tasks on the dsPIC, especially when sending or receiving larger packets.

Bonybrown’s previous work is in the web platform folder of the SVN. We’ll try to release the newer code as a complete project archive in a few days.

There is one more web platform in the Seeed shop, ready for immediate dispatch. We’re pretty sure this will be the last one, when it’s gone we don’t plan to make more. The web platform is $40 including worldwide shipping.

Trev got the Microchip telnet server demo working on the web platform. Then, he took it further and hacked it to work with telnet clients on multiple systems.  There’s a lot of great info about the Microchip TCPIP stack and telnet services in his writeup.

We covered Trev’s earlier work with the Microchip TCP/IP stack last week.

The web platform is $40 including worldwide shipping. There are still web platforms available, but when they’re gone we don’t plan to make more.

A few months ago we started a port of the uIP TCP/IP stack for the dsPIC33-based web platform. Bonybrown picked up the source and got it working. The current version can accept 10 simultaneous telnet connections, and has ping times of 0.68ms:

Next steps I’d like to try are to replace the polling loop with an interrupt from the ENC28J60 when packets arrive, and to try using DMA to get the packets into and out of the ENC28J60.

Get details and download the firmware in the forum. We’ve also moved the latest source to the project SVN.

There are still a couple web platforms available for immediate delivery at Seeed Studio, when they’re gone we don’t plan to make more. The web platform is $40, including worldwide shipping.

Trev spent a lot of time hacking and documenting the Microchip TCP/IP stack for the web platform. Trev’s extensive write-up shows how he got these features working:

• SMTP mail client, email demo
• HTTP authentication, adding authentication to the email demo
• MD5 hash demo
• HTTP2 demo, multiple HTTP connections
• Custom dynamic web pages

More in the forum post.

There are still a couple web platforms available for immediate delivery at Seeed Studio, when they’re gone we don’t plan to make more. The web platform is $40, including worldwide shipping.

Hidden away in SparkFun’s AD5330 demo is an open source FAT SD card read/write library from Roland Riegel. The MMC/SD/SDHC card library is intended for AVR microcontrollers, and it supports FAT16 and FAT32, partition tables, and low-level read/write operations.  The source download includes an example application. This project should be pretty easy to port to any microcontroller, such as the PIC on our web platform.

The web platform EEPROM and SD card server firmwares have stability problems at full speed, we encountered this bug with the @tweet_tree. Markus Gritsch posted test firmwares that have now been running for over 72hours without interruption. They even work when the PIC and SPI interface are overclocked beyond the datasheet specifications.

A single edit to the Microchip TCPIP stack seems to have fixed stability issues, but it’s not quite clear why as the SPI settings should now be incorrect. We’ll post an update after we run the current and updated firmware under debug.

There is also a partial port of the open source uIP TCPIP stack in the SVN. It’s still a work in progress.