Embedded Systems Design - March 2008 - (Page 44) 0308esd.p41to46 2/13/08 8:03 PM Page 44 20 years ago Listing 1 An HDL model for a traffic-light controller. MODULE control_lights TITLE 'Traffic Light Controller' DEVICE 'p16r8'; @ INCLUDE 'bjstate.tab @ MESSAGE 'includes completed' on, off := 1,0; "INPUTS system_clock PIN 1; reset PIN 2; "OUTPUTS greenA, yellowA, redA PIN 12,13,14; greenB, yellowB. redB PIN 15,16,17; Initialize MACRO () {IF reset := on THEN greenA, redB := on; yellowA, yellowB, redA, redB := off; GOTO delay_1; ELSE } @ PAGE STATE_DIAGRAM light_change STATE Agreen_to_yellow: Initialize (); greenA := off; yellowA := on ; GOTO Ayellow_to_red; STATE Ayellow_to_red: Initialized (); yellowA := off; redA := on ; GOTO Bred_to_green; STATE Bred_to_green: Initialized (); redB := off; greenB := on ; GOTO delay_1 STATE Bgreen_to_yellow: Initialize(); greenB := off; yellowB := on ; GOTO Byellow_to_red; STATE Byellow_to_red: Initialized(); redB := on ; yellowB := off; GOTO Ared_to_green; STATE Ared_to_green: Initialize(); greenA := on ; redA := off; GOTO delay_1; @ IRP ?count(1,2,3), ?next(2,3,4) {STATE ~delay_?count: Initialize(); GOTO delay_?next; } IF greenA = on THEN Agreen_to_yellow ELSE Bgreen_to_yellow; @ EXIT "include file for state-machine control "Declare local variables. Specify input pins. Specify output pins. "Start listing after form feed. "Define HDL model type. "Traffic light A changes to yellow. "Traffic light A goes red. "Traffic light B goes green. "Traffic light B goes yellow. "Traffic light B goes red. "Traffic light A goes green. "Four-unit clock delay is "generated by compiler directive "for indefinite repeat. "NOTE: This line creates warning during compiler expansion. 44 MARCH 2008 | embedded systems design | www.embedded.com http://www.embedded.com
Table of Contents Feed for the Digital Edition of Embedded Systems Design - March 2008 Embedded Systems Design - March 2008 Contents #Include Programming Pointers Designing DSP-based Motor Control Using Fuzzy Logic Hardware/Software Verification Enters the Atomic Age Efficient CRC Calculation with Minimal Memory Footprint Programming Your Own Microcontroller Advertising Index Break Points Marketplace Embedded Systems Design - March 2008 Embedded Systems Design - March 2008 - (Page BB1) Embedded Systems Design - March 2008 - (Page BB2) Embedded Systems Design - March 2008 - Embedded Systems Design - March 2008 (Page Cover1) Embedded Systems Design - March 2008 - Embedded Systems Design - March 2008 (Page Cover2) Embedded Systems Design - March 2008 - Embedded Systems Design - March 2008 (Page 1) Embedded Systems Design - March 2008 - Embedded Systems Design - March 2008 (Page 2) Embedded Systems Design - March 2008 - Contents (Page 3) Embedded Systems Design - March 2008 - #Include (Page 4) Embedded Systems Design - March 2008 - #Include (Page 5) Embedded Systems Design - March 2008 - #Include (Page 6) Embedded Systems Design - March 2008 - #Include (Page 7) Embedded Systems Design - March 2008 - #Include (Page 8) Embedded Systems Design - March 2008 - Programming Pointers (Page 9) Embedded Systems Design - March 2008 - Programming Pointers (Page 10) Embedded Systems Design - March 2008 - Programming Pointers (Page 11) Embedded Systems Design - March 2008 - Programming Pointers (Page 12) Embedded Systems Design - March 2008 - Programming Pointers (Page 13) Embedded Systems Design - March 2008 - Programming Pointers (Page 14) Embedded Systems Design - March 2008 - Programming Pointers (Page 15) Embedded Systems Design - March 2008 - Designing DSP-based Motor Control Using Fuzzy Logic (Page 16) Embedded Systems Design - March 2008 - Designing DSP-based Motor Control Using Fuzzy Logic (Page 17) Embedded Systems Design - March 2008 - Designing DSP-based Motor Control Using Fuzzy Logic (Page 18) Embedded Systems Design - March 2008 - Designing DSP-based Motor Control Using Fuzzy Logic (Page 19) Embedded Systems Design - March 2008 - Designing DSP-based Motor Control Using Fuzzy Logic (Page 20) Embedded Systems Design - March 2008 - Designing DSP-based Motor Control Using Fuzzy Logic (Page 21) Embedded Systems Design - March 2008 - Designing DSP-based Motor Control Using Fuzzy Logic (Page 22) Embedded Systems Design - March 2008 - Designing DSP-based Motor Control Using Fuzzy Logic (Page 23) Embedded Systems Design - March 2008 - Designing DSP-based Motor Control Using Fuzzy Logic (Page 24) Embedded Systems Design - March 2008 - Designing DSP-based Motor Control Using Fuzzy Logic (Page 25) Embedded Systems Design - March 2008 - Designing DSP-based Motor Control Using Fuzzy Logic (Page 26) Embedded Systems Design - March 2008 - Hardware/Software Verification Enters the Atomic Age (Page 27) Embedded Systems Design - March 2008 - Hardware/Software Verification Enters the Atomic Age (Page 28) Embedded Systems Design - March 2008 - Hardware/Software Verification Enters the Atomic Age (Page 29) Embedded Systems Design - March 2008 - Hardware/Software Verification Enters the Atomic Age (Page 30) Embedded Systems Design - March 2008 - Hardware/Software Verification Enters the Atomic Age (Page 31) Embedded Systems Design - March 2008 - Hardware/Software Verification Enters the Atomic Age (Page 32) Embedded Systems Design - March 2008 - Efficient CRC Calculation with Minimal Memory Footprint (Page 33) Embedded Systems Design - March 2008 - Efficient CRC Calculation with Minimal Memory Footprint (Page 34) Embedded Systems Design - March 2008 - Efficient CRC Calculation with Minimal Memory Footprint (Page 35) Embedded Systems Design - March 2008 - Efficient CRC Calculation with Minimal Memory Footprint (Page 36) Embedded Systems Design - March 2008 - Efficient CRC Calculation with Minimal Memory Footprint (Page 37) Embedded Systems Design - March 2008 - Efficient CRC Calculation with Minimal Memory Footprint (Page 38) Embedded Systems Design - March 2008 - Efficient CRC Calculation with Minimal Memory Footprint (Page 39) Embedded Systems Design - March 2008 - Efficient CRC Calculation with Minimal Memory Footprint (Page 40) Embedded Systems Design - March 2008 - Programming Your Own Microcontroller (Page 41) Embedded Systems Design - March 2008 - Programming Your Own Microcontroller (Page 42) Embedded Systems Design - March 2008 - Programming Your Own Microcontroller (Page 43) Embedded Systems Design - March 2008 - Programming Your Own Microcontroller (Page 44) Embedded Systems Design - March 2008 - Programming Your Own Microcontroller (Page 45) Embedded Systems Design - March 2008 - Programming Your Own Microcontroller (Page 46) Embedded Systems Design - March 2008 - Programming Your Own Microcontroller (Page 47) Embedded Systems Design - March 2008 - Advertising Index (Page 48) Embedded Systems Design - March 2008 - Break Points (Page 49) Embedded Systems Design - March 2008 - Break Points (Page 50) Embedded Systems Design - March 2008 - Marketplace (Page 51) Embedded Systems Design - March 2008 - Marketplace (Page 52) Embedded Systems Design - March 2008 - Marketplace (Page Cover3) Embedded Systems Design - March 2008 - Marketplace (Page Cover4)
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