https://github.com/kongr45gpen/stm32h7-freqcounter

A frequency counter for the NUCLEO-STM32H743
https://github.com/kongr45gpen/stm32h7-freqcounter

frequency-counter nucleo stm32 stm32-utility stm32h7

Last synced: 3 months ago
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A frequency counter for the NUCLEO-STM32H743

• Host: GitHub
• URL: https://github.com/kongr45gpen/stm32h7-freqcounter
• Owner: kongr45gpen
• Created: 2018-09-05T21:09:14.000Z (almost 7 years ago)
• Default Branch: master
• Last Pushed: 2019-11-23T16:55:18.000Z (over 5 years ago)
• Last Synced: 2025-01-15T07:16:46.611Z (5 months ago)
• Topics: frequency-counter, nucleo, stm32, stm32-utility, stm32h7
• Language: C
• Homepage:
• Size: 1.93 MB
• Stars: 2
• Watchers: 2
• Forks: 2
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# stm32h7-freqcounter

A frequency counter for the NUCLEO-STM32H743

![Frequency counter image, displaying frequency in kHz and number of ticks on an OLED screen](SSD1306.jpg)

## Usage details

- UART: 8N1, 115200 baud/s

- Processor frequency: 400 MHz

- Measurement resolution (theoretical): 2.5ns

## Pinout

- `PD8` --> USART3_TX (default for Nucleo)

- `PC10` (opposite of NRST) --> **counter input**

#### OLED pinout (optional)

Tested OLED: SSD1306 (4-wire SPI)

- `3.3V` --> `VCC`

- `GND` --> `GND`

- `PB3` (opposite of D10) --> `SCK`/`D0`

- `PB5` (opposite of D11) --> `MOSI`/`D1`

- `PF12` (D8) --> `RES`ET

- `PD15` (D9) --> `DC` (Data/Command)

- `PB12` (opposite of GND) --> `CS`/`NSS` (Negative Slave Select)

#### Sample output

- `PC9` (opposite of IOREF) --> 200 MHz (`MCO` - Master Clock Output)

#### Nucleo pinout

https://www.st.com/content/ccc/resource/technical/document/user_manual/group0/26/49/90/2e/33/0d/4a/da/DM00244518/files/DM00244518.pdf/jcr:content/translations/en.DM00244518.pdf,

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