Tones Tidbits

Things I learn and don't want to forget. Things I think others might want to know!

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TCP/IP Networking, Part 2: Web-Based Control - Microchip

TCP/IP Networking, Part 2: Web-Based Control - Read more about embedded, microchip, applications, submitted, method and input.

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car tyre size

*I think* it’s 205 50 17 88v

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PNP

Because I use them so infrequently I forget...

Base current flows out of base, Emitter is +ve supply, collector is output

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Simple inverter

An NPN bjt with a base input resistor and a pullup on the collector should function as a logical inverter

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LATD, LATE, TRISD, TRISE fail PIC 18F4550

If the NC pin associated with the ICPORT (pin 34) is not pulled to 5V, PORT D, PORT E, SPP & something else are all disabled. Writes to those registers are ignored, contents stay at zero...

If pin 34 is floating/ground, a certain combo of config bits including DEBUG can bring those parts of the chip to life!

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PIC works in debug but not release

Check 10K pull up present from /MCLR to VDD

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PIC read write rule of thumb

"Rule of thumb: Always read inputs from PORTx and write outputs to LATx. If you need to read what you set an output to, read LATx."

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Microchip demo code

It's poorly documented. It's extremely hard to follow. It's very difficulty to modify successfully. Damn, it's even hard to compile it without even makign any changes!

It's rarely updated to take into account the fact that the new IDE won't compile the existing code.

I hope to very rarely have to use PICs...

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.do file syntax (modelsim)

radix -hexadecimal

add wave \ {sim:/testbench/DUT/FIFO/WE } \ {sim:/testbench/DUT/FIFO/RE } \ {sim:/testbench/DUT/FIFO/WCLOCK } \ {sim:/testbench/DUT/FIFO/RCLOCK } add wave -divider <1st> add wave sim:/testbench/DUT/FIFO/WE add wave -divider <2nd> add wave /testbench/* add wave sim:/testbench/DUT/* add wave sim:/testbench/DUT/ADC_SM0/* run -all

Divider names MUST NOT include spaces! I think

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Setting Trigger in ControlDesk Next Generation

If a trigger doesn't work properly, stop and re-start in "Measurement Configuration"

Help files:

C:\Program Files (x86)\Common Files\dSPACE\HelpDesk 2014-A\Print\ControlDeskNextGenerationBasicPracticesGuide.pdf

Page 549/1016...

"Specify the variable you want to use for triggering. Select it in the Variable Browser and drag it onto the platform trigger in the tree or the Variable Mappings list in the platform trigger configuration."

Also...

Page 546/1016

"Pretriggering and posttriggering of data captures"

"With triggered measurement, it is possible to perform pretriggering and posttriggering. You must specify a trigger delay for the start trigger for this.

A pretrigger time is a period of seconds for starting data capture

before the start condition is met. A pretrigger time must be defined as a negative delay for an enabled start trigger. For example, with a delay value of -0.5, ControlDesk will actually start the data capture 0.5 seconds before the start condition is met.

A posttrigger time defines a period of seconds for delaying data

capture after the start trigger is invoked. A posttrigger time must be specified as a positive delay for an enabled start trigger. For example, with a delay value of 1, ControlDesk will actually start the data capture 1 second after the start condition is met."

Page 737/1016: How to put variables on a plotter under user control...

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Modelsim - automatic changed parameters

Use

`ifdef MODEL_TECH  if it doesn't work, check the source file is included in the .do file

NOTE - do not use `ifdef (MODEL_TECH) it won't work!

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Proteus PCB is shit

In just about every way, this is one of the worst pieces of software I've ever had the misfortune to use. It crashes, it won't autosave, it barely works anyway and it's limitations are so plentiful it's hardly worth it...

It's now been the downfall of 4 keyboards and a monitor, with plenty more damaged...

Avoid. It will ruin you

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Proteus Ares changes to default track width selection

Proteus Ares PCB is obviously completely and unbelievably awful... You probably know that if you're reading this.

Thanks to http://www.slideshare.net/Mashood/pcb-design-using-proteus-18385708 I realise that the answer to my problem is trivial - Auto Trace Style Selection was turned on by default (not by me, because it prevents the software working usefully). turn it off, and one can select any trace width...

Auto-trace style selection prevents routing by changing from a narrow track to a wider one, then failing DRC and not allowing a route to be placed... How stupid!

Good luck, you'll need it!

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Extra, unused pins

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Good tune

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PIC32 JTAG, TRIS pins not responding

On PIC32MX764:

JTAG default is on for release, off for debug - so output pins RB10 RB11 RB12 RB13 only work in debug

To turn off JTAG:

DDPCONbits.JTAGEN = 0;