at24cm0x

SSD130X Display Driver

This hardware abstracted driver can be used to interact with an SSD130XSSD130X over (software-)TWI/I2C. The hardware layer is fully abstracted an can be switched between different plattforms. The TWI/I2C library has to impelement the twi.h- or the twi_soft.h-header used in this repository.

File Structure

drivers/
└── display/
    ├── font/
    |   ├── font.h
    |   ├── font.c
    |   └── fonts/
    |       └── font_5x7_ascii.c
    └── ssd130x/
        ├── ssd130x.c
        ├── ssd130x.h
        ├── frame/
        |   ├── frame.c
        |   └── frame.h
        └── tty/
            ├── tty.c
            └── tty.h
 
hal/
├── common/
|   ├── defines/
|   |   └── TWI_defines.h
|   └── enums/
|       └── TWI_enums.h
└── avr0/
    ├── twi/
    |   ├── twi.c
    |   └── twi.h
    └── twi_soft/
        ├── twi_soft.c
        └── twi_soft.h
 
core_types/
├── gfx/
|   └── elements.h
└── numeric/
    ├── datatypes.c
    └── radix.h
 
utils/
├── macros/
|   └── stringify.h
└── systick/
    ├── systick.c
    └── systick.h

The plattform avr0 can completely be exchanged with any other hardware abstraction library. Note that all unused plattfomrs in ./hal folder should be deleted to prevent compliling issues!

Downloads

The library can be downloaded (zip or tar), cloned or used as submodule in a project.

Type	File	Description
Library	zip / tar	SSD130X display library including all required libraries (including hal-avr(0)-twi and hal-avr(0)-twi_soft).

Using with git clone

mkdir -p ./drivers/display
git clone https://github.com/0x007E/drivers-display-font.git    ./drivers/display
mv ./drivers/display/drivers-display-font                       ./drivers/display/font
 
mkdir -p ./drivers/display/
git clone https://github.com/0x007E/drivers-display-ssd130x.git ./drivers/display
mv ./drivers/display/drivers-display-ssd130x                    ./drivers/display/ssd130x
 
mkdir -p ./core_types/
git clone https://github.com/0x007E/core_types-gfx.git          ./core_types
mv ./core_types/core_types-gfx                                  ./core_types/gfx
 
git clone https://github.com/0x007E/core_types-numeric.git      ./core_types
mv ./core_types/core_types-numeric                              ./core_types/numeric
 
mkdir -p ./hal/
git clone https://github.com/0x007E/hal-common.git              ./hal
mv ./hal/hal-common                                             ./hal/common
 
# !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
# Hardware abstraction layer of TWI (Must fit the used plattform)
# HARDWARE-TWI
mkdir -p ./hal/avr0/
git clone https://github.com/0x007E/hal-avr0-twi.git            ./hal/avr0
mv ./hal/avr0/hal-avr0-twi                                      ./hal/avr0/twi
 
# SOFTWARE-TWI
mkdir -p ./hal/avr0/
git clone https://github.com/0x007E/hal-avr0-twi_soft.git       ./hal/avr0
mv ./hal/avr0/hal-avr0-twi                                      ./hal/avr0/twi_soft
# !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 
mkdir -p ./utils/
git clone https://github.com/0x007E/utils-macros.git            ./utils
mv ./utils/utils-macros                                         ./utils/macros
 
git clone https://github.com/0x007E/utils-systick.git           ./utils
mv ./utils/utils-systick                                        ./utils/systick

Using as git submodule

git submodule add https://github.com/0x007E/drivers-display-font.git    ./drivers/display/font
git submodule add https://github.com/0x007E/drivers-display-ssd130x.git ./drivers/display/ssd130x
 
git submodule add https://github.com/0x007E/core_types-gfx.git          ./core_types/gfx
git submodule add https://github.com/0x007E/core_types-numeric.git      ./core_types/numeric
 
git submodule add https://github.com/0x007E/hal-common.git              ./hal/common
# !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
# Hardware abstraction layer of TWI (Must fit the used plattform)
# HARDWARE-TWI
git submodule add https://github.com/0x007E/hal-avr0-twi.git            ./hal/avr0/twi
 
# SOFTWARE-TWI
git submodule add https://github.com/0x007E/hal-avr0-twi_soft.git       ./hal/avr0/twi_soft
# !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 
git submodule add https://github.com/0x007E/utils-macros.git            ./utils/macros
git submodule add https://github.com/0x007E/utils-systick.git           ./utils/systick

Programming

#include "../lib/drivers/display/ssd130x/ssd130x.h"
 
// TTY-Mode
#include "../lib/drivers/display/ssd130x/tty/tty.h"
 
// FRAME-Mode
#include "../lib/drivers/display/ssd130x/frame/frame.h"
 
#include "../lib/utils/systick/systick.h"
 
// Called every microsecond!
ISR(...)
{
    systick_tick();
}
 
void systick_timer_wait_ms(unsigned int ms)
{
    systick_timer_wait((ms * 1000));
}
 
void systick_timer_wait_us(unsigned int us)
{
    systick_timer_wait(us);
}

It is possible to work with the basic ssd130x (low-level-driver) functions (for details see ssd130x.h).

int main(void)
{
    systick_init();
 
    #ifdef SSD130X_USE_SOFT_TWI
        twi_soft_init();
    #else
        twi_init();
    #endif
 
    // It is possible to work with the basic ssd130x (low-level-driver) functions (for details see ssd130x.h)
    ssd130x_init();
    ssd230x_clear();
}

To use software-TWI, either a global definition of SSD130X_USE_SOFT_TWI or uncommenting SSD130X_USE_SOFT_TWI in ssd130x.h is required!

To handle text and/or graphics a better approach would be tu use the implemented frame/tty (frontend) functions. A how-to-use guide can be found on here.

TTY - Console Mode

// TTY-Mode
tty_init();
printf("Test");

Details on how-to-use/setup the tty-mode can be found here.

FRAME - Drawing Mode

// FRAME-Mode
GFX_Position position = { 102, 2 };
 
frame_init();
frame_draw_text("Test", position);

Details on how-to-use/setup the frame-mode can be found here.

Additional Information

Type	Link	Description
SSD1306	pdf	OLED/PLED Segment/Common Driver with Controller

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R. GAECHTER