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194 Threads found on edaboard.com: Lookup Table
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
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.
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 (...)
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?
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 ?
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
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
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.
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.
f(x) can be e.g. implemented as lookup table or polynomial.
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
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
I need to know how to send saved data in lookup table to audio codec of de2-70 altera kit line out in VHDL.
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?
The DDS is pretty simple. If you want simpler, just use a lookup table.
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...
How the lookup table values are created to vary the duty cycle accorging to sine amplitude
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; (...)
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
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