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U8glib-HAL

u8g by Oliver Kraus with extensions for ARM and the Marlin HAL.

The extensions allow access to the u8g library by "non native" CPUs/systems.

AVR, Arduino, and Due access to the library is not changed.

Enabling the extensions by defining the flag U8G_HAL_LINKS. This can be done in platformio.ini by adding -DU8G_HAL_LINKS to any environment's build flags.

The following files provide the links between the u8g library and the "non native" CPUs/systems.

#include <LCD_defines.h>

The LCD_defines.h header brings in the top level link file which:

  • Defines link files for SPI routines, delay routines, I2C routines and class definitions.
  • Connects u8g com generic com defines to the desired HAL com routine.

#include <LCD_delay.h>

Contains code or declarations for the u8g routines:

  • void U8g_delay(int msec)
  • void u8g_MicroDelay(void)
  • void u8g_10MicroDelay(void)

#include <LCD_pin_routines.h>

Contains code or declarations for the u8g routines:

  • void u8g_SetPinOutput(uint8_t internal_pin_number)
  • void u8g_SetPinInput(uint8_t internal_pin_number)
  • void u8g_SetPinLevel(uint8_t pin, uint8_t pin_status)
  • uint8_t u8g_GetPinLevel(uint8_t pin)

#include <LCD_I2C_routines.h>

Contains code or declarations for the u8g routines:

  • void u8g_i2c_init(uint8_t options)
  • uint8_t u8g_i2c_wait(uint8_t mask, uint8_t pos)
  • uint8_t u8g_i2c_start(uint8_t sla)
  • uint8_t u8g_i2c_send_byte(uint8_t data)
  • void u8g_i2c_stop(void)

MarlinFirmware Changes

  • Empty constructors are now provided so the u8g instance can be initialized later. Data members are still constructed early when the u8g object is declared static global.
  • Constructors that just take an "options" argument now require the argument (e.g., U8G_I2C_OPT_NONE) or they will be treated as default empty constructors and won't be initialized.