https://github.com/mbedlab/pcf8574-stm32

This library can expand the number of IO microcontrollers with pcf8574.
https://github.com/mbedlab/pcf8574-stm32

extender io micro pcf8574 pin ports stm32

Last synced: about 1 month ago
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This library can expand the number of IO microcontrollers with pcf8574.

• Host: GitHub
• URL: https://github.com/mbedlab/pcf8574-stm32
• Owner: mbedlab
• Created: 2024-08-29T10:36:38.000Z (4 months ago)
• Default Branch: master
• Last Pushed: 2024-09-11T08:33:08.000Z (4 months ago)
• Last Synced: 2024-11-28T08:12:39.762Z (about 1 month ago)
• Topics: extender, io, micro, pcf8574, pin, ports, stm32
• Language: C
• Homepage:
• Size: 2.93 KB
• Stars: 1
• Watchers: 1
• Forks: 0
• Open Issues: 1
• Metadata Files:
  • Readme: README.md

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README

        
# PCF8574 STM32 HAL Library

This library allows you to control the PCF8574 I/O expander using the STM32 HAL library. It supports setting and reading individual pins and controlling multiple PCF8574 modules on a single I2C bus.

## Features

- Control individual pins on the PCF8574.

- Support for multiple PCF8574 modules on the same I2C bus.

- Easily toggle, set, or read the state of each pin.

- Compatible with STM32 HAL library.

## Requirements

- STM32 microcontroller

- STM32 HAL library

- I2C communication bus

## Getting Started

### Hardware Setup

Connect the PCF8574 to the I2C bus of the STM32 microcontroller. You can connect up to 8 PCF8574 modules on the same bus by configuring the A0, A1, and A2 address pins.

### Software Setup

1. Include the `pcf8574.h` and `pcf8574.c` files in your project.

2. Make sure that the I2C peripheral is initialized in your STM32 project.

### Example Usage

Here is an example of how to initialize and use the library:

```c

#include "pcf8574.h"

// Create a handle for PCF8574

PCF8574_HandleTypeDef pcf8574;

int main(void) {

    // HAL initialization

    HAL_Init();

    

    // I2C handle (example, customize as needed)

    I2C_HandleTypeDef hi2c1;

    // Initialize your I2C peripheral (ensure this is done based on your project setup)

    // HAL_I2C_Init(&hi2c1);

    // Initialize the PCF8574 with the desired address (A0 = 0, A1 = 0, A2 = 0)

    PCF8574_Init(&pcf8574, &hi2c1, 0, 0, 0);

    // Set Pin 0 to HIGH (1)

    PCF8574_WritePin(&pcf8574, 0, GPIO_PIN_SET);

    // Read the state of Pin 0

    GPIO_PinState state = PCF8574_ReadPin(&pcf8574, 0);

    while (1) {

        // Toggle Pin 0

        PCF8574_TogglePin(&pcf8574, 0);

        // Delay for 500 ms

        HAL_Delay(500);

    }

}