#TRAFFIC LIGHT DURATIONS DRIVER#
#TRAFFIC LIGHT DURATIONS MANUAL#
#TRAFFIC LIGHT DURATIONS PRO#
#TRAFFIC LIGHT DURATIONS SOFTWARE#

My coding style is very specific (you can read about it in StampWorks, a book I wrote for Parallax ages ago ).ДЄnyway, I hope this causes you to think about other approaches to your programming tasks.Infrastructure Traffic Signals Report a Problem The code seems long but it is very simple, very flexible, and mostly self-documenting. I use a state/timer approach: each light has a state (red, green, or yellow), and each of these states has a run-time associated with it. In my version, red lights over lap by a few seconds to deal with those people who rush through the intersection on yellow - having both red for a couple seconds seems like a good idea.

#TRAFFIC LIGHT DURATIONS PRO#

That's not to say you asked, nor that I'm a pro (though I do get paid for coding), I thought I'd do this as a break from my work because I've written hundreds of BS2 programs (but not in a while), and I walk around my city a lot and am frequently watching the traffic lights for their logic.ДЄs I'm a highly visual person, and this program has a visual outcome, I started with the attached illustration to work out the sequence. When I started programming I would ask those with more experience to show how they would tackle a particular problem - I learn a lot by dissecting code written by pros. I can pretty much guarantee you'll impress your instructor if you do. So to the extent that you can, you should try to follow this ethic in your own code. ' setup and attach a single VID.TEXT, 0, VID.FLASH_TEXT, VID.getVGAPalette(), VID.getvgafont(), 16, $1F) '!!!!! MUST SET THIS BEFORE ANY TEXT PRINTING STARTS OR IT COULD HANG !!!!

'userTiming - when non-zero points to timing structure to be used to setup displayДim VID as class using VID.VGA, VGA_BASE_PIN, VGA_VSYNC_PIN, VID.RGBHV, LINEBUFSIZE, timing) 'maxLineSize - size of each scanline in the line buffer 'lineBuf - hub address of two scanline working buffer 'flags - indicates if interlaced/progessive, PAL/NTSC 'syncPin - used for vertical sync output in VGA RGBHV mode 'basePin - pin number of starting pin or group of pins 'output - indicates type of output - VGA, DVI, COMPONENT_HDTV etc 'display - indicates address of where display data is to be stored

#TRAFFIC LIGHT DURATIONS DRIVER#

'initDisplay spawns driver COG returns cogid, display starts up blank until a region is attached But he did it the right way, which means that anyone who knows the language can pick this up, study it for a bit, and effectively maintain it. If he had simply written the code, with no comments, and if he used hard-coded numbers instead of well-named variable/constants, I'd be completely and forever lost.

#TRAFFIC LIGHT DURATIONS MANUAL#

When Roger wrote this, he effectively baked a users manual right in to the code itself. Notice that there are 3x more comments than actual code in this section! This is professional-grade code. I don't expect you to be able to read this, but just glance at it. This is a code snippet from a video driver demo program written by that I trivially modified for use in BASIC.

that was a good effort, and you have working code! So drinks all I wanted to follow-up my earlier post with an example of why comments are so important. HIGH EWYellow ' East/west road: yellow onДЄnyway. I don't actually know which pins are connected to which traffic light, but let me give you an example of what I'm thinking: Also, breaking your code up into blocks helps readability a bunch. Maybe do something like 'High EWRed' instead of 'High 14' would be clearer to a new reader? Think about how you might assign a pin number to a name in PBasic. So how about adding comments that tell the world what the code is doing at any given point?ДЄnother trick is to replace the pin numbers with the name of the light they control. To a stranger who looks at that code, there is going to be a bit of a learning curve. And understand that none of what follows is criticism. So its best to bake that idea into the code right at the start.

#TRAFFIC LIGHT DURATIONS SOFTWARE#

Now lets talk about maintainability, because even the most trivial software has to be, at some point, maintained.

Traffic light durations