ximtech / max7219

Compact, serial input/output common-cathode display driver

MAX7219

STM32 Low Layer(LL) library. MAX7219 are compact, serial input/output common-cathode display drivers that interface microprocessors (µPs) to 7-segment numeric LED displays of up to 8 digits, bar-graph displays, or 64 individual LEDs.

Features

• Dot LED Matrix library
  • Text shift and scroll
  • Custom text font and image print
  • Predefined text fonts and sprints

Add as CPM project dependency

How to add CPM to the project, check the link

CPMAddPackage(
        NAME MAX7219
        GITHUB_REPOSITORY ximtech/MAX7219
        GIT_TAG origin/main)

Project configuration

1. Start project with STM32CubeMX:
   • SPI configuration
2. Select: Project Manager -> Advanced Settings -> SPI -> LL
3. Generate Code
4. Add sources to project:

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

include_directories(${includes}
        ${MAX7219_MATRIX_DIRECTORY})   # matrix display source directories

file(GLOB_RECURSE SOURCES ${sources}
        ${MAX7219_MATRIX_SOURCES})    # matrix display source files

3. Then Build -> Clean -> Rebuild Project

Wiring

• Single module
  • 
• Multi modules
  • 

Usage

In main.h set configuration defines

#define MAX7219_NUMBER_OF_MATRIX_DISPLAYS  4    // by default 4 led matrix modules selected

// Define fonts. Comment unused.
#define MAX7219_FONT_DEFAULT  1
#define MAX7219_FONT_SPRITES  2
#define MAX7219_FONT_REGULAR  3

• Usage example: link