74HC595

STM32 LL(Low-Layer) shift register library. A shift register allows to expand the number of I/O pins you can use from any microcontroller.

Features

No limit in register count
Easy bit manipulation
Small code footprint

Add as CPM project dependency

How to add CPM to the project, check the link

CPMAddPackage(
        NAME 74HC595
        GITHUB_REPOSITORY ximtech/74HC595
        GIT_TAG origin/main)

Project configuration

Start project with STM32CubeMX:
- SPI configuration
Select: Project Manager -> Advanced Settings -> SPI -> LL
Generate Code
Add sources to project:

add_subdirectory(${STM32_CORE_SOURCE_DIR}/SPI/Polling)  # add SPI to project

include_directories(${74HC595_DIRECTORY})   # source directories
file(GLOB_RECURSE SOURCES ${74HC595_SOURCES})    # source files

Then Build -> Clean -> Rebuild Project

Wiring

Usage

#include "74HC595.h"

#define SHIFT_REGISTER_COUNT 2
#define DELAY 50

int main() {
    
    ShiftRegister shiftRegister = initShiftRegister(SPI1, CHIP_SELECT_GPIO_Port, CHIP_SELECT_Pin, SHIFT_REGISTER_COUNT, REG_RESET_GPIO_Port, REG_RESET_Pin);
    uint16_t binaryCounter = 0;
    
    while (1) {
        sendU16ToShiftRegister(&shiftRegister, binaryCounter);
        latchShiftRegister(&shiftRegister);
        binaryCounter++;
        delay_ms(DELAY);
    }
}