Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [optimization]

108 questions
21
votes
6 answers

LTspice automation

I have a battery-powered boost converter and I'm attempting to measure the maximum input (battery) voltage droop under various load conditions of high current draws (different duty-cycles/periodicities) in addition to over several battery types…
Joel B
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16
votes
2 answers

Why is this Verilog RAM modification better in terms of resource usage?

I'm using the open-source toolchain Yosys > NextPnr > IcePack for synthesising code for the Lattice HX8K FPGA. Here's a common version of a 1Kb RAM (that I'm using as Video RAM for a VGA module): module text_ram #( parameter A = 10, …
Hugo Sereno Ferreira
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15
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12 answers

Is it really a good-practice disable optimizations during the development and debugging phases?

I've read Programming 16-Bit PIC Microcontrollers in C, and there is this affirmation in the book: During the development and debugging phases of a project, though, it is always good practice to disable all optimizations as they might modify…
Daniel Grillo
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15
votes
2 answers

How can I specify "don't care" signals in VHDL?

In Logic Design courses we all learned that it is possible to minimize a logic function, for example by using a Karnaugh map or the Quine–McCluskey algorithm. We also learned that "Don't Care" values increase the minimization potential. For example…
Fritz
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13
votes
6 answers

Tips for optimizing through-hole soldering

I make and sell low voltage, mostly digital, retrocomputing expansion boards as a hobby/hustle. I use all through-hole components partly because of the retro aesthetic and partly because I find soldering through-hole relaxing and fun to do. I'm…
Sam Washburn
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13
votes
10 answers

Fastest way to get integer mod 10 and integer divide 10?

If a hardware doesn't support modulus or division operations, it takes many more CPU cycles to simulate modulus/division by software. Is there any faster way to calculate division and modulus if the operand is 10? In my project I frequently need to…
Donotalo
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12
votes
3 answers

How to identify areas of a FPGA design that use the most resources and area?

I am working on a large FPGA design, and I am very close to the resource limits of the FPGA that I am currently using, the Xilinx LX16 in the CSG225 package. The design is also almost complete, however at the moment it will no longer fit in the…
Marcus10110
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10
votes
7 answers

Simplifying many window comparators

I have 8 thermistors and I must make sure that each of them is inside a temperature window. They all have the same window and I don't care which or how many are inside the valid range, I just need to know if all of them are inside the (same) window…
ultimA
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9
votes
2 answers

Reduce the size of the Arduino bootloader?

Is there any way of reducing the size of the preloaded Arduino bootloader, to save some bytes for the program?
powtac
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9
votes
1 answer

While loop optimized away

I have the following code in my microcontroler program: // Wait for ADC conversion to complete while ( ( ADCSRA && _BS( ADSC ) ) == _BS( ADSC ) ) {} Where ADCSRA is a register that will change its value once an analog conversion is completed and…
jippie
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9
votes
4 answers

Why GCC compiler omitting some code?

I can not understand why GCC compiler cutting out part of my code while it preserve absolutely the same one in the neighborhood? The C code: #define setb_SYNCO do{(PORTA|= (1<<0));} while(0); ISR(INT0_vect){ unsigned char i; i = 10; …
Roman Matveev
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9
votes
2 answers

Under what conditions does an optocoupler work fastest?

I want to use the optocoupler FODM452R2 in my design. I want this optocoupler to run as fast as it can (i.e.; work with minimum propagation delay and least rise/fall times). What is the optimum R1, R2 resistor values and magnitudes of V1, V2…
hkBattousai
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8
votes
3 answers

SPI chip select optimisation

I am designing an SPI system with one master and two slaves. In a normal SPI system, the master needs 2 outputs to control the slaves' chip select lines. I want to use only one output to drive both chip selects thanks to a classic NOT gate.…
M.Ferru
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7
votes
2 answers

AVR assembly: fastest way to increment two combined bytes

What is the fastest way to increment two combined bytes in assembler (assuming I'm working on an 8-bit CPU)? Currently I'm doing this: OVF1_handler: ; TIMER1 overflow ISR lds r21, timerhl ; load low byte into working register; 2 cycles add r21,…
arminb
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7
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2 answers

Electromagnet design

Im trying to design a maximum strength electromagnet. I have a soft iron core that is 1.3" (33mm) round by 1.9" (50mm) long and I'm using 12 volts of input and my wire gauge is 18awg. Unfortunately I don't have the proper program to achieve this…
Warren
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