VHDL PWM generator
This VHDL module generates a pulse-width modulation (PWM) signal with generic counter length and run-time configurable frequency.
The pwm.vhd module uses pulse-width modulation (PWM) to exert precise control of the average current flowing through an analog device.
Example use cases for the module are audio modulation (speakers), light intensity control (lamps or LEDs), and induction motors. The latter includes servo motors, computer fans, pumps, brushless DC motors for electric cars.
In addition to the testbench, the Zip contains an example implementation for the Lattice iCEstick FPGA board. The demo design controls the illumination intensity of an onboard LED on the iCEstick. The LED will illuminate gradually and turn off abruptly before the sawtooth pattern repeats itself.
entity pwm is generic ( -- PWM and duty cycle counter bit length pwm_bits : integer; -- Clock divider max count -- Set to 1 to disable clock divider logic -- pwm_hz = clk_hz / (2**pwm_bits - 1) / clk_cnt_len clk_cnt_len : positive := 1 ); port ( clk : in std_logic; rst : in std_logic; duty_cycle : in unsigned(pwm_bits - 1 downto 0); pwm_out : out std_logic ); end pwm;
Click here to read more about how I created this module:
How to create a PWM controller in VHDL
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