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28 Threads found on Pwm Vhdl
hi guys, im working on altera de0 nano cyclone iv. There is a code written with verilog for adxl 345 sensor. I m trying to write same code with vhdl. I' m using spi 3 wire. After sending data format and power control datas i cant recieve x value here is my code : library IEEE; use IEEE.STD_LOGIC_1164.all; -- Uncomment the
Well your testbench instances a component called 'SPI' and 'pwm01', but those entities are never defined. Similarly, 'head' calls out 'main' and 'pwm', but those entities are not defined. I think you're confusing the entity/component name with the label. You probably want to say 'UUT : head port map(...'. Additionally, you don't need to define
if counter < 10000 then pwm <= '1'; else pwm <= '0'; end if; Change 10000 to 500000. Did you check the pinout? Are you sure that the output levels of your board are set to 3.3V ?
There are plenty of existing IP cores for pwm available (, but it's also fairly simple to write it yourself in VDHL/Verilog.
I found a web site gives pwm generator with multiple phases output ,however it is supposed the pwm frequency is given , what should I modify the code so that any pwm frequency can input to the vhdl code
I wonder if you want to make the pwm period equal 50001 instead of 50000 clock cycles?
1.Did you simulate your design? 2.What's the pwm frequency that you're trying to generate? I know that hobby grade servos work at around 400Hz - not 10KHz...
I am trying to control two Futaba S3003 servo motor with a basys2 board. I understand that the servo works of pulse width modulation and have done the required calculations to create the correct pulse widths. I have written the implementation constraints to output on the the JA and JB terminals. I have tested the system with an oscilloscope/mul
hi i need a vhdl code for pwm generation for boost converter..i want to generate a pwm by comparing a output of pi controller with triangular wave(counter) plz help me in this..m complete new to vhdl/.
1. Complete vhdl Project 2. As of now im using Single Phase. only one H-Bridge with 4 switches. 3. Generating the pulses from comparing values of sine samples(lookup table) to triangular samples(up/down counter) 4. Im able to generate sine pwm and want to update my design for closed loop design. 5. What is a matrix converter? 6. Are there any
Have you connected an O-scope to the pin you are intending to use for your pwm signal. I would think your issue is more than likely your signal and not just identifying a pin in the constraint file. My suggestion would be to set up a counter from (0 to Period) where period is the value (which depends on you clock rate) that equates to 20 ms. Next
to make things easier, you could start by eliminating the std_logic_vectors for the counters and replacing them with integer, natural or unsigned. Write a counter, let it run from 0 to max_countervalue, set the dout signal, when the counter reaches the desired value, reset your dout signal (port). If you translate this piece of text to vhdl/v
It could be that pwm_out becomes bigger than 255 and thus fall out of the range of 8 bit. But like TrickyDicky wrote, the line indication is line 1347. You should have a look at that line.
lvhdl code for generation of pam,ppm & pwm waveforms using xilinx software.... plz do reply......its urgent
If you meen "seeing" in hardware, you'll need a digital-to-analog conversion means. For low data rates, a pwm modulated pin with a low-pass can do. But involves additional logic. Some DevKits are equipped with DAC hardware, I think.
yes..i know vhdl. some of it. state machine that I had build for a car a red signal in modelsim where it supposed to be a pwm enable and a pwm signal what you mean by car? red signal in modelsim? pwm? i dont get it.. if is not related to the thread title, then can you post another thread for it?
pls help, i m doing my final year project.. which is a (8bit) vhdl model of three phase pwm. i have written vhdl code for the pwm. in the embedded design, i need to write a c-program to generate 3 phase sine waves to the port 1 of the TSK51a microprocessor that will communicate with the vhdl model. (also (...)
hi, am doing project in three phase pwm rectifier for harmonic reduction.can any one send me the vhdl code for three phase pwm generation using sinusoidal pwm technique.pwm rectifier consists of 6 MOSFET switchs.the conduction of each switch is 120 degree and interval between 2 switchs is 60 degrees.the (...)
Hello, I just wondering wht's the way to sample the pwm signal in vhdl so that to design an integrator with pwm signal as input.
*only exact solution will get the reward. URGENT SOLUTION NEEDED. Problem: i want to count number of pulses of a DC motor operated at +5v. the clock used in controller was 50MHz. The Design consist of PID (16-bit output,8-bit input and feedback) +pwm.the #of pulses[
There are some points, that have to be considered before writing pwm code (respectively trying to copy some existing code): - the modulation scheme can be natural, regular symmetrical or regular asymmetrical sampling - pwm modulation input can be either relative (+/- 1 range) or absolute (requested output voltage). In the latter case, a bus v
I have some vhdl which is just a pwm generator. I would like to add this vhdl in a A/D circuit in PSPICE and test it with some different value resistors and capacitors for a low-pass filter for the output... Basically to create a 1-bit DAC. But i have no idea how to do this at all. Okay sorry to burst your bubble but Pspice does
Hi !!! It 's quite easy... You built a free running counter. The bit size of the counter depends on the desired pwm command resolution. If you want a 8 bit command, then you have to build a 8 bit counter. The counter 's clock is derived from your system 's clock. frequency_counter=desired_frequency_pwm*pwm_bit_resolution Then you (...)
From ur post what I guess is you need code for pwm to drive a DC motor. If I am right you can get vhdl code for pwm from net. Checkout this!
i guess that is possible once u use square waves instead of sines. u can obtains pwm... I have done that once.. u need timer circuits to do that.... in case your objectives can be met in that case it was so.
Hi! I don't have a background on vhdl/FPGA until last month when i started to self-study because there is a design contest in our school. Part of the contest is designing a pwm Encoder having 8 bits of input from an ADPCM Decoder and the pwm Encoder is fed with a PCM. The output of the pwm Encoder is also 8 bit. I (...)
I'm trying to implement (in vhdl) a simple 3-bit counter that is loaded asynchronously. The CPU writes to an 8-bit register, in which 3 of those bits are the ones that are loaded into the counter. These 3-bits determine the duty cycle for the pwm output that is gated on the TC of the counter. Has anyone had any experience designing loadable c
Hello, Does anyone have a vhdl implementation of a symmetrical pwm generation? or a link? Thanks, S