[Circuit Cellar] Internet News Ticker as Feature Article

2008/09/30 16:40 / Applications/News Ticker

[Circuit Cellar #218]

Content Collection and Display Build an Internet-Connected News Ticker

FEATURE ARTICLE by James Blackwell


James no longer has to turn on a TV or computer to get news updates. His innovative design retrieves news headlines from RSS feeds and constantly scrolls them across a dot-matrix LED display. The system checks for updates every 15 minutes.


When I first heard about WIZnet’s iEthernet 2007 design contest, I was really excited about all of the possibilities an integrated Ethernet chip would open up to smaller microcontrollerbased systems. I knew there were tons of networking applications that I could create (e.g., web servers, remote sensor networks, and home automation/control systems).

But many of the designs that first came to mind had already been done to death, and when it came down to finding a new project, I struggled a bit. Having missed the last few Circuit Cellar contests, I knew I had to get an entry done for this one. At the time, I was messing around with interfacing dot-matrix LED displays to microcontrollers. I showed a friend how to make customized messages scroll across a display by programming a computer a certain way. (He wasn’t exactly a Circuit Cellar reader.) He was really interested in the stock market, so he thought it would be nice to have a scrolling stock ticker similar to those shown on some financial television programs.

I thought it was a really good idea, but rather than scrolling stock information, I decided to scroll up-to-date news headlines. Luckily, there are many news organizations that provide free news updates via the Internet. Nearly all of the major ones provide really simple syndication (RSS) feeds for news headlines as well. RSS gives content providers a way to distribute periodically updated material. Conveniently, RSS uses XML, so the relevant data is well-structured for processing by clients. To retrieve the news headlines, I wrote a cut-down HTTP client and XML parser.

I wanted the device to operate without any action by the user, so I implemented a domain name service (DNS) and dynamic host configuration protocol (DHCP) client in order to use dynamic IP addressing. Every 15 min., the device renews its client IP, requests the IP of the BBC News RSS server, parses the XML for news headlines, and scrolls them across the display (see Photo 1). The system features a Microchip Technology PIC18F2525, PIC18F2221, and a WIZnet WIZ810MJ Ethernet module. In this article, I’ll describe how I used these building blocks to design the news ticker.

SOME CHALLENGES

I wanted the design to be as simple and inexpensive as possible. The WIZnet chip handles most of the network processing,so a cheaper, less complexmicrocontroller could be used for controlling the system. Knowing that these products have a limited amount of internal RAM, I considered adding some external storage for buffering the incoming XML data; but ultimately, I decided against that.

Without a buffer large enough to store the entire web page, I was limited to using only the integrated receive buffers of the WIZnet chip. Although the software would be more complicated, the need for an additional external component was eliminated.

Controlling all of the LEDs presented another challenge. Nearly all dot-matrix LED displays are common-anode or common-cathode. Each row of the matrix is connected to the anode or cathode of every LED in that row. The columns of the matrix are connected to the opposite end of every LED in that column. Each row is then sequentially enabled while manipulating the columns of the matrix in order to illuminate the specified LEDs in that row. This process is called “scanning.” If the matrix is scanned at a high enough frame rate, persistence of vision will be maintained.

The purpose of scanning is to reduce the number of control pins required, along with the amount of power needed to illuminate the display. Continuously scanning the display takes a lot of processing time, so a master/slave arrangement was used. In this setup, the master tells the slaves what image to draw while the slaves draw the image. This allows a large amount of I/O manipulation to be offloaded to the slaves, leaving the master free to do more important things. A side effect of matrix scanning is a reduction in display brightness. Because each row of the display is on only once per frame refresh, and you have eight rows in the frame, the average current through an LED will be 12.5% of its instantaneous current. If the LEDs and their current-limiting resistors are specified for 20 mA (a pretty standard LED current), the average current through them will be only 2.5 mA due to the low duty cycle of matrix scanning.



Fortunately, the LEDs are still bright enough with the reduced current. I actually halved the recommended LED current from 20 to 10 mA. With the average current through each LED equal to 1.25 mA, the display was still easy to read in daylight. A nice feature of LEDs is that they can withstand pulses of current much higher than their recommended average current. If the display is not bright enough using the 20-mA recommended average current, it can be raised according to the specification of the LEDs. For the LEDs in my displays, the maximum pulse current is 100 mA. With a 12.5% duty cycle, this gives an average current of 12.5 mA through each LED? still well within the recommended average range.

Make sure to select an appropriate current for your LEDs. There are 128 LEDs in each display, and I used eight displays in this system for a total of 1,024 LEDs. If 12.5 mA was selected as the average current through each LED, the maximum average current draw for the entire display would be 12.8 A! Using an average LED current of 1.25 mA reduces the total current required by a factor of 10. You’re now familiar with many of the gotchas I encountered. Let’s move on to the hardware behind the project.

THE HARDWARE

As you can see in Figure 1, the design consists of a main board and eight slave boards that piggy-back to bicolor dot-matrix LED displays. The main board is responsible for handling networking-related tasks, updating the frame buffer for the display, and sending each slave the current frame it should be drawing. The slave boards continually paint their frame buffers to their respective LED matrix while waiting for the main board to send them updated display data. Each LED matrix contains 64 pixels, organized as an 8 × 8 square. Each pixel is represented by a red and green LED, for a total of 128 LEDs per matrix.

A maximum of eight characters can be fully displayed at one time. The main board is fairly simple (see Photo 2 and Figure 2). It features a PIC18F2525 at 32 MHz, a WIZ810MJ Ethernet module, power supply circuitry, and headers for connecting the slave boards. The WIZnet module houses a WIZnet W5100 integrated Ethernet controller and an RJ- 45 jack with integrated magnetics. The eight slave boards are also simple (see Photo 3 and Figure 3).




Each one uses a PIC18F2221 at 32 MHz, a 1.32″ 8 × 8 bicolor, common-anode dot-matrix LED display, a pair of Texas Instruments TPIC6C596 power shift registers, and four Fairchild Semiconductor FDC6312 dual-channel P-FETs. Shift registers are used to further reduce the number of I/O pins required to interface to the matrices. Each shift register is 8 bits wide, so two are used to control the 16 LEDs that make up the columns of each matrix (one green, one red, eight of each). They also provide a highpower current sink for the LED cathodes. The P-FETs act as high-current, don’t use the bicolor capability.

There are a lot of unlit pixels as well due to the shapes of each letter and spaces between words. Still, I have some wiggle room in case I ever decide to increase the display brightness. The microcontrollers and LED circuitry are powered by the 5-V rail provided by the regulated switching power supply. A linear regulator on the main board provides the 3.3 V required by the WIZnet module. The module and the PIC18F2525 are 3.3-/5-V-tolerant, so level-shifting circuitry isn’t required. The master communicates with the slaves via a SPI bus. Each slave has its own chip-select line. The bus’s data rate is kept at a minimum due to the distance between the main board and the slaves. A SPI bus is also used to communicate with the WIZnet module.

WIZnet MAKES IT EASY

Having to deal with implementing a software TCP/IP stack with fairly limited resources is a pain, so a fully featured drop-in solution was attractive. There was also the added bonus of offloading a nontrivial amount of processing to an external chip, leaving the master to skip a lot of the grunt work. The WIZnet chip greatly reduced the complexity of the main board’s firmware. The WIZnet chip supports many protocols, including the well-known TCP and UDP among others. These two protocols are used for all of the networking services that the main board implements (DHCP, DNS, and HTTP).

The W5100’s socket interface enables connection to other nodes on the network. You probably read Fred Eady’s article, “iEthernet Bootcamp: Get Started with the W5100” (Circuit Cellar 208, 2007). Fred explained the socket interfaces better than I can, so refer to his article if you want to delve into the details of setting up the W5100 registers correctly. Suffice it to say, depending on the protocol used, all that’s needed for a socket connection are the IP addresses of the client and host and the source and destination port. Once these are established, you can begin sending and receiving data.

MAIN BOARD FIRMWARE

The firmware for the main board was written in C using Microchip’s C18 compiler and MPLAB IDE. Nearly all 4 KB of RAM provided by the PIC18F2525 is used. Less than half of the 48 KB of program memory was used, so some functionality can be added. The program itself is separated into several different tasks and is entirely interrupt driven. Short tasks are executed in the interrupt, while long tasks poll status flags and execute in the main loop. The main board’s primary tasks are the news update task, the display task, and the “updating message” task.

NEWS UPDATE TASK The news update task is responsible for DHCP leasing, DNS querying, downloading news updates via HTTP, and formatting them for display. Three out of the four sockets are used on the WIZnet module (one for each of the previous services). The task is called approximately every 15 min. While it is running, it calls the “updating message” task to display a message while the headlines are downloaded from BBC News. Every time the task is run, a DHCP lease is requested and a DNS query is made to resolve the IP address of newsrss.bbc.co.uk. Although caching and lease times are provided from the queries, these are ignored for the sake of simplicity.

DHCP

DHCP is a convenient feature to have on a device like this. It enables the automatic retrieval of local network information, including a free client IP address, the subnet mask, the gateway IP address, and the DNS server IP address. All of these are required to establish a connection on the Internet. Without DHCP, this information would have to be manually entered periodically because the addresses are dynamic. I wanted the device to operate without user interaction, so implementing a DHCP client was required. DHCP uses UDP to facilitate client and server communication and is implemented on its own socket (socket #1). Figure 4 shows the process of obtaining local network information using DHCP.


The client first broadcasts a DHCP Discover packet, which alerts DHCP servers on the network. Multiple DHCP servers may respond with a DHCP Offer packet. This packet notifies the client of an IP if one is available for lease. The client responds to the first server that responds. The client then sends a DHCP Request packet to the first DHCP server found, requesting the IP that was previously received in the DHCP Offer. If the server accepts the request, a DHCP ACK packet is sent. This confirms with the client that the IP is now assigned. If an IP is not served, the process will repeat until a client IP is obtained.

DNS

DNS is another useful feature to have. Instead of having to remember the IP address of every web site you visit, DNS allows familiar hostnames (e.g., www.circuitcellar.com) to be used to connect to remote hosts. Many host IP addresses are dynamic, so DNS is another must-have (unless you want to update the IP manually, and that’s no fun). DNS uses UDP for communication between servers and clients. It is implemented on its own socket (socket #2).

The process is straightforward and has only two steps. The client sends a DNS query packet to the DNS server that was identified through DHCP. The query packet contains the requested domain name (newsrss.bbc.co.uk in this case) in the form of questions. Multiple questions, and hence domain names, can be sent, but you need to look up only one domain name in this case. Following the question section is the answer section. This area will be used by the DNS server’s reply, but it is unused in queries. The DNS server sends a DNS response after receiving a query. It is noteworthy that the format for queries and responses is identical.

The DNS response contains the original question sent by the client along with an answer. Multiple answers can be sent even if only one question is asked. Some of the answers may be redirected domain names, which can safely be ignored. The IP address of the server is the only data you’re looking for. The DNS client parses the answer section until it finds the required IP address of the host.


HTTP

HTTP is used to obtain the XML data from the BBC RSS news feed. It uses TCP and is implemented on its own socket (socket #0). HTTP supports several actions that enable data transfers from the host to the client, or vice versa. In this case, the only action you’re concerned with is GET. There’s nothing complicated here. The GET action retrieves a web page. The only data needed for the GET action is the URL of the web page you want. Once a GET action is received by the host, it starts transmitting the requested page to the client. The XML data must be parsed to extract the desired news headlines. Fortunately, XML provides a nicely structured set of data by enabling providers to define their own elements. Elements are basically data grouped around “< >” tags.

The BBC RSS feed provides the news headlines in elements named description. The tags will appear as <description> in the XML. Listing 1 shows a sample of a description element and the news headline it contains. The XML data is parsed while it is still in the WIZnet chip’s receive buffers. The parser steps through the buffer, looking for the beginning of a description tag. Once one is found, it stores the following text until the end of the description tag is found (</description> in this case). The news headlines are stored in the PIC18F2525’s internal memory and most of it is used for that purpose.

About 20 headlines can be stored, each with a maximum of 145 characters. BBC headlines are generally less than 120 characters. If a headline is longer than 145 characters, additional characters are discarded. Once all of the headlines are stored, they must be parsed again. XML uses special sequences of characters to represent quotation marks, apostrophes, and ampersands (&quot;, &apos;, and &amp;, respectively). The parser must find them and convert them to the correct characters.

DISPLAY TASK

The display task updates the slaves with display data and maintains the frame buffer. It is called approximately every 16 ms. Compared to the news update task, the display task is relatively simple. It shifts all of the data in the frame buffer left one pixel every time it is run. When the frame buffer has been shifted eight pixels, it loads the next character into the buffer. Once the last headline is displayed, the task wraps around to the first headline. The frame buffer holds pixel data for 10 frames. The display itself shows only eight of those frames (one frame for each LED matrix).

An extra frame is on both ends of the buffer and they’re there to facilitate scrolling. Each frame in the buffer stores 8 bytes of information. Each byte represents a column of the LED matrix. Each bit then determines whether that pixel is on or off. Sixty-four bits are used for each frame (8 bytes × 8 bits), with each bit corresponding to one pixel on the LED matrix. To convert news headlines to pixels, an 8 × 8 font table is used. The table maps ASCII characters to pixel data for the LED displays. Eight bytes are used for each ASCII character. Like the frame buffer, each byte represents a column and each bit represents a pixel.

SLAVE BOARD FIRMWARE

The firmware for the slave boards was written in C using Microchip’s C18 compiler and MPLAB IDE. Few resources are used on the slaves because their responsibilities are limited. Compared to the main board, the slave firmware is pretty dumb. The program sits in a loop, continually refreshing the display, while waiting for the SPI interrupt to trigger. The SPI interrupt routine simply loads the data received from the master into a frame buffer. The infinite loop continuously refreshes the LED matrix. Only one row is illuminated at a time, and rows are illuminated sequentially.

Each byte in the 64-byte frame buffer holds the color information for a single pixel. The data corresponds to the binary representation of which LEDs should be illuminated. For each row, a 16-bit number is generated holding the bit pattern for the LED columns. For example, the binary bit pattern B“11111111 11111111” would turn on every LED. The bit pattern B“01010101 01010101” would turn on every red LED. The pattern B“00000000 00000000” would turn off all LEDs, and so on. When the entire frame has been refreshed, the process begins again.

HAVE FUN

This project was a success. It is still sitting on my workbench, so I can read news headlines when I am not near a computer. You learn a lot by doing a project like this because there’s so much functionality involved.

There’s also a lot of room for new features that I didn’t have time to implement. One that I will eventually integrate is the ability to upload a customized message through a web page that the main board will host. I may even add the ability to scroll stock information in the future.

James Blackwell (j.blackwell@azosoft.com) graduated from Cleveland State University in 2007 with a Bachelor’s degree in Electrical Engineering. He currently works as a design engineer for Delta Systems in Streetsboro, Ohio. When James isn’t perfecting his perpetual motion machine, he enjoys playing bass guitar and drums.



[PROJECT FILES]
To download code, go to ftp://ftp.circuitcellar.com/pub/Circuit_Cellar/2008/218.

[RESOURCES]
* Circuit Cellar 208 “iEthernet Bootcamp: Get Started with the W5100,”
* WIZnet, Inc.,
“Application Note - DHCP,” 2008
“Application Note - DNS,” 2008 “W5100 Datasheet,” 2008

[RESOURCES]
FDC6312 MOSFET
Fairchild Semiconductor Corp.
www.fairchildsemi.com

MPLAB C18 Compiler, PIC18F2221, and PIC18F2525
Microchip Technology, Inc.
www.microchip.com

TPIC6C596 Shift register
Texas Instruments, Inc.
www.ti.com

WIZ810MJ Ethernet module
WIZnet, Inc.
www.wiznet.co.kr/en

 
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