262 PWM generator
262 : PWM generator
- Author: Matea Samuel
- Description: Generate pwm signal with configurable period - 12-bit - and duty cycle - 1%-99%.
- GitHub repository
- Clock: 50000000 Hz
How it works
This design is intended to function as a PWM generator. It contains two 12-bit registers: one for the duty cycle (duty_reg) and one for the period (period_reg). When the sel signal is set to "0," the duty_reg is selected, and when sel is "1," the period_reg is selected. If values for the duty cycle or period are provided at the input, they are written to the registers only when wr_en is set to "1." For the duty cycle, only 7 bits (from 0 to 6) are used, with the remaining bits hardcoded to 0. The value for period_reg can range from 2 to 4095 (using 12 bits). The pwm_out signal will be available only when out_en is set to "1."
How to test
Connect the output to an oscilloscope and verify whether the frequency and duty cycle correspond to your expectations.
External hardware
The only external hardware required is the wire for the pwm_out signal and 15 inputs (such as a microcontroller, digital pattern generator, etc.) to set the period, duty cycle and controls signals: sel, wr_en, and out_en.
IO
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | in[0] | pwm_out | in[8] |
| 1 | in[1] | in[9] | |
| 2 | in[2] | in[10] | |
| 3 | in[3] | in[11] | |
| 4 | in[4] | ||
| 5 | in[5] | out_en | |
| 6 | in[6] | sel | |
| 7 | in[7] | wr_en |