711 Frequency counter

711 : Frequency counter

  • Author: Matt Venn
  • Description: measured frequency of a signal on pin 0 and displays on the 7 segment display
  • GitHub repository
  • Clock: 10000000 Hz

How it works

Debounces the input signal and counts how many transistions occur in a given period. A state machine then divides the count by ten by repeatedly subtracting ten and then displays the tens and units on the seven segment display.

How to test

Apply a signal to the signal input and the frequency will be measured and displayed on the seven segment. The dot is used to select between display tens and units.

To change the count period (to get accurate counts), set it to match the clock frequency: clock_mhz * 100 - 1. So for a 10MHz clock, set to 999. Set the desired period (top 4 bits ui_in and all of uio_in) on the bidirectional inputs and toggle load input.

To debug, enable debug mode and check the bidirectional outputs for state machine, clock count and edge count information.

Picture

IO

#InputOutputBidirectional
0signalsegment acount period bit 07 or debug edge bit 2
1debug mode (on will put debug signals on bidirectional outputs)segment bcount period bit 06 or debug edge bit 1
2load new period. toggle this to register the value in the bidirectional inputssegment ccount period bit 05 or debug edge bit 0
3segment dcount period bit 04 or debug clock bit 2
4count period bit 11segment ecount period bit 03 or debug clock bit 1
5count period bit 10segment fcount period bit 02 or debug clock bit 0
6count period bit 09segment gcount period bit 01 or debug state bit 1
7count period bit 08digit selectcount period bit 00 or debug state bit 0

Chip location

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