Frequency Counter's
Modified on Jan. 13th, 2020
added simple Freq. counter program for STM32F4xx
linked F746 Frequency Counter document(Japanese).
https://onedrive.live.com/?id=E726C1E354E854B2%211099156&cid=E726C1E354E854B2
I made several type of "Frequency Counter" using mbed boards.
Type 1) Simple and easy set-up
Range: Max 24MHz (F411)
Gate time: 1 second only
Base Clock : CPU Clock on mbed board
mbed Board's: LPC1768, LPC1114FN28, Nucleo-F401RE, Nucleo-F411RE
URL: /users/kenjiArai/notebook/simple-frequency-counter/
Import programFrequency_Counter
Only for mbed LPC1768, mbed LPC1114FN28, Nucleo-F401 and Nucleo-F411. No way to change pin assign.
Last commit 04 Aug 2020 by 
Kenji Arai
Modified on Jan. 13th, 2020
Import programFrequency_Counter_for_STM32F4xx
Simple frequency counter, run without modification on Nucleo board, Input pin PA0, PA1, PB3. Only for STM32F4 series (Tested on Nucleo-F401RE,-F411RE and F446RE)
Last commit 13 Jan 2020 by Kenji Arai
Only for STM32F401,F411 and F446 (maybe extend STM32 series(no tested)).
Assign additional input pin as PA0, PA1, PB3.
Use internal clock -> This means not so accurate compare with Type2 and others.
Type 2) Basic concept
Range: Max 24MHz
Gate time: 1 second only
Base Clock :
(1) 25MHz VCTXO with temperature controlled Oven
(2) GPS 1PPS signal
mbed Board: Nucleo-F411RE
URL: Not available any documentation
Import programFrequency_Counter_w_GPS_1PPS
Accurate Frequency Counter up to 25MHz. Base clock is compensated by GPS 1PPS pulse. This program runs only on mbed NucleoF411RE.
Last commit 02 Jan 2015 by Kenji Arai
Type 3) Simple but enough accuracy
Range:
(1) Max 100MHz (without prescaler)=F746, Max 90MHz=F446, Max 48MHz=F411
(2) Max 1GHz (with prescaler)=F746
(3) Reciprocal 0.01Hz to 5KHz
Gate time: 1 second, 10sec, 100sec, 1000sec max 4095sec
Base Clock : GPS 1PPS signal
mbed Board: DISCO-F746NG, Nucleo-F411RE, Nucleo-F446RE
URL: here
Operation concept:
(1) F746
/media/uploads/kenjiArai/block_diagram_fc_f746_wo_oven.pdf
(2) F411&F446
/media/uploads/kenjiArai/block_diagram_fc_f411_wo_oven.pdf
Hardware Circuit:(common F746,F446 and F411)
/media/uploads/kenjiArai/fc_f746ng_circuit.pdf
program:
(1) Output to PC (via USB(VCOM line))
Import programFreqCntr_GPS1PPS_F746F4xx_w_recipro
Very simple but enough accuracy "Frequency Counter". Using GPS 1PPS signal for 1sec gate. CPU is F746, F446 and F411.
Last commit 16 Nov 2016 by Kenji Arai
(2) DISCO-F746NG Graphic User Interface
Import programFreq_Cntr_GPS1PPS_F746NG_GUI
Frequency Counter. User interface are used DISCO-F746NG GUI with touch panel.
Last commit 19 Nov 2016 by Kenji Arai
Type 4) Complex and accurate type (extended Type 2))
Range:
(1) Max 100MHz (without prescaler)
(2) Max 1GHz (with prescaler)
(3) Reciprocal 0.01Hz to 5KHz
Gate time: 1 second, 10sec, 100sec, 1000sec max 4095sec
Base Clock :
(1) 50MHz VCTXO with temperature controlled Oven
(2) GPS 1PPS signal
mbed Board: Nucleo-F746ZG
URL: here
Operation concept:
/media/uploads/kenjiArai/block_diagram_fc_f746_w_oven.pdf
Hardware Circuit:
/media/uploads/kenjiArai/fc_gps1pps_w_oven_final.pdf
/media/uploads/kenjiArai/50mhz_oven.pdf
/media/uploads/kenjiArai/lcd_sw.pdf
program:
Import programFrequency_Cntr_1PPS_F746ZG
Frequency counter using GPS 1PPS signal and temperature controlled 50MHz Base clock. Ported from F411 Frequency Counter.
Last commit 22 Dec 2019 by Kenji Arai
Recomendation
Best solution is Type 3) Nucleo-F446RE mbed.
This solution is very simple and enough accuracy with reasonable cost.
Pictures
Type 3) F446
Tera Term output Type3)F446
Type 3) DISCO-F746NG
Type 4) Nucleo-F746ZG
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Frequency Counter's
Frequency counter using GPS 1PPS with mbed board
Page owner: Kenji Arai
Created 23 Nov 2016.
Last updated 13 Jan 2020
I have STM32F401 Nucleo Board; trying to execute/run => Type 2) Basic concept, but it couldnot work for me. Kindly let me know changes I need to make?