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# Lookup Table

194 Threads found on edaboard.com: Lookup Table

## Generate a sine wave using a PIC microcontroller

You can have look at the basic working theory @ Its implemented for LPC2148 but the underlying working is the same. You need to generate or use a hardcoded sine lookup table which feeds values to your PWM block and at the PWM output use a filter which acts a D

## How to compare two bits in the same byte using ASM?

Both the BTFSC and BTFSS instructions are supposed from the midrange Microchip's PIC familly. Anyway, when it is said "many lines of code" don't necessarily means as being not a fast implementation. You could think about put all the 4 possible results in a lookup table by using the RETLW instruction.

## Which low-frequency DDS should I use?

I'm not aware of a simple single chip DDS solution that includes arbitrary waveforms (RAM lookup table). For the intended low frequency range, a DDS generator with RAM lookup table can be well implemented in a single chip processor. ARM or dsPIC with built-in DAC could be used, otherwise an external DAC. As your (...)

## data pointing in ROM in pic16f887 problem.

hi all, i work in assembly language with pic16f887 i want to use ROM as readable memory. like i have used with DPTR in 8051. what are DB and DT in PIC16? how can i use ROM with DB or DT direactive for making long lookup table?

## 8b10b encoding function

Hello, In the past, I've implemented a 8b/10b encoder based on a ROM lookup table and it works fine. But what is the mathematical function behind it? I.E 8b/10b is based on 5b/6b + 3b/4b. What is the mathematical function that encodes 5b to 6b ? What is the mathematical function that encodes 3b to 4b ?

## PIC16F1936 variable duty cycle with lookup table and potentiometer

Hello,there could anyone help me to create a PWM signal with variable duty cycle using potentiometer and using a lookup table from internal EEPROM? I am able to adjust the duty cyle using a potentiometer on RA0 but still have a problem on reading from EEPROM and pass those values to the PWM module,please help.!! I am using ASM for better prec

## wide tuning range sine wave generation up to RF

Normally it would be a VCO offset by the fmax performed by a voltage controlled cavity resonator using lookup table corrected values for linearity. 1) A large number of smart calibrated digital / voltage controlled filters are required. (DVCF) as follows; a) intermodulation tracking notch filter b) tracking bandpass filter c) all-pa

## Verilog-a tunnel fet simulation

hai, I'm trying to do Sdevice simulation of InAs Tunnel FET given by Penn State Univesity. im getting Id value in microamperes. Have anyone tried with InAs TFET simulation? If you are getting same result as they gave in lookup table, pls help me also.

## logic to generate variable frequency output.

Instead of generating different lookup tables during execution - what would make an expressive overhead on core processing - you could consider to simply change the sample frequency for the PWM, but using a single table.

## controlling widths of optical pulses

f(x) can be e.g. implemented as lookup table or polynomial.

## How to implement V/f control of 3 phase acim by arduino UNO

hi frnds i wan to make v/f control of 3phase acim successfuly i generate 3 phase sine wave, which frequency can vary frm 1hz to 1023hz using 3 phase DDS by sine lookup table, timer,interrupt. now i wana to implement V/F i attached my program /****************************************************************** * DDS-sin

## How to store integer string from keyboard on FPGA

First you have to convert the scan codes into the binary equivalent of the decimal number using a lookup table. That gets added to an accumulator. You'll need some method to clear the accumulator at the start of a new number. Each time you enter a new digit you will multiply the accumulator by 10 (too bad the number isn't hex) and add in the new nu

## sine table to Audio CODEC line out de2-70 vhdl

I need to know how to send saved data in lookup table to audio codec of de2-70 altera kit line out in VHDL.

## How to design a simplified LUT

You seem to have struggled to explain it to us - so helping is rather hard. I assume with the 4 bit address lookup you've lost some resolution in the lookup values?

## Sine Wave Generation on an FPGA

The DDS is pretty simple. If you want simpler, just use a lookup table.

## square root output in two clockcycle....

Depending on the resolution you require, etc., you could use a lookup table approach. This would obviously require significant memory resources, but if you are willing to trade-off real-estate for speed...

## lookup table to generate sine using fast pwm;

How the lookup table values are created to vary the duty cycle accorging to sine amplitude

## How to calculate/interpolate delay values from the Liberty file 3-D lookup table?

Anybody knows how to interpolate delay values from the 3-D lookup table in the Liberty file? here are some sample template: /* 3-D table template f(i_trans, o_cap, r_cap) */ lu_table_template( f_itrans_ocap_rcap ) { variable_1 : input_net_transition; variable_2 : total_output_net_capacitance; (...)

## lookup table in hitech C compiler

PIC16F73 flash is 4K words , i compiled my code so now code side is 1K words , After this i did add below lookup table: constant unsigned int look = {0x1234, 0x2EF3, 0x3FFF,........}; and compiled it , so now code size 3K words , Actually 1024 nos of cont int should be = 1K words prevoius code size =1K words so t

## ASM: LCD to PIC 4-bit writing to screen problem

Hi everyone. Thank you for all your suggestions, links and help I have had success and now have a fully functioning LCD display using assembly code! 107253 ;************************************* ; written by: pic122 * ; date: Tue 8th July * ; version: 1.0 * ; da