- About
- Brief information about Pmod ENC
- Interface Description
- Simulation
- Test
- Status Information
- Warning
- Licence
Simple interface for the Digilent Pmod ENC. This will automatically cleans glitches and creates pules for turn directions.
The Digilent Pmod ENC is a rotary shaft encoder with an integral push-button and a switch.
| Port | Type | Width | Description |
|---|---|---|---|
clkSys |
I | 1 | System Clock |
rst |
I | 1 | System Reset |
A |
I | 1 | A pin of Pmod ENC |
B |
I | 1 | B pin of Pmod ENC |
dir0 |
O | 1 | Pulse to indicate one click in diraction 0 |
dir1 |
O | 1 | Pulse to indicate one click in diraction 1 |
btn_i |
I | 1 | Directly connected to btn_o |
sw_i |
I | 1 | Directly connected to sw_o |
btn_o |
O | 1 | Directly connected to btn_i |
sw_o |
O | 1 | Directly connected to sw_i |
I: Input O: Output
There is also an internal clock divider in enc. Controller by following parameters:
| Parameter | Default Value | Description |
|---|---|---|
DIVIDER_EN |
1 | Enable Divider, assign 0 to disable |
CLOCKDIVISION |
10 | Division value |
Cleaning glitches implemented via use of a 16 bit shift register. A and B values are shifted in the register and AND of all bits of corresponding shift register is used as A and B values.
Decoder module, without glitch cleaning and clock dividing hardware, simulated in sim.v.
Module enc tested on test.v. Positive edges of dir0 and dir1 are connected to 4 bit counters. Counter values are displayed on leftmost and rightmost seven segment displays.
Last simulation: 5 February 2021, with Icarus Verilog.
Last test: 2 April 2021, on Digilent Basys 3.
CERN Open Hardware Licence Version 2 - Weakly Reciprocal