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Extra info for Circuit Cellar (August 2003)

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Com Listing 2—I used this snippet of code to produce a carousel of colorful numbers on the numeric LED display. while(1) { for (i=0; i<99999; i++) { //Convert i to string for display itoa(i, TestNumber); //Send it to the numeric LED display in color } MaxPrint(TestNumber); pause(10); } rate EPLD, FPGA, or VLSI techniques. I chose the PIC18C452 microcontroller because it was more economical at $15 than a BasicX or ATOM micro costing approximately $50 (supporting IEEE floating point). The Stamp BSP doesn’t have support for floating point, so I couldn’t have considered it for this project.

This was a fun project, especially after I figured out how to get the multicolored LED display working, because I was able to produce animated color displays. I also felt a great sense of accom- Listing 3—What do you think about my version of Predko’s keypad debounce algorithm written in PIC18 C? It was originally written in PIC assembly, but I converted it to C so that I could use it for my calculator application. , Serially Interfaced, 8-Digit LED Display Drivers, 19-4452, rev. 3, 1997. Figure 3—You’ll need a 5-V power supply to power your calculator’s controller board and the optional LED display board.

After receiving a CAN message, the ’18F258 reads the CAN receive buffer into RAM. This data is byte stuffed, and the message is transferred to the FT245BM’s transmit buffer. The data sits in the FT245BM transmit buffer until the PC’s USB drivers poll the FT245BM to check to see if it has available data. This polling is a weak point for USB, because the USB slave node must wait for a USB packet to indicate that it is ready to begin transmission. But, you probably won’t notice this because the FTDI’s transmit buffer is so large.

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Circuit Cellar (August 2003)


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