128x64-OLED weniger störempfindlich machen

// initialize display (this function must not be called directly after power-on; displays need time to power up; there is a delay in module_init() for that reason)

void

oled_init()

{

    oled_reset();                                // hard display reset (via reset pin)

    oled_command(OLED_COMMAND_DISPLAYOFF);       // display off

    oled_command(OLED_COMMAND_SETVCOMDETECT);    // set VCOMH deselect level

    oled_command(0x20);                          // ~0.77 x VCC

    oled_command(OLED_COMMAND_SETMULTIPLEX);     // set multiplex ratio to suggested value

    oled_command(0x3F);

    oled_command(OLED_COMMAND_SETDISPLAYOFFSET); // set mapping of display start line to 0 (no offset)

    oled_command(0);

    oled_command(OLED_COMMAND_SETSTARTLINE);     // set display start line to 0

    oled_command(OLED_COMMAND_MEMORYMODE);

    oled_command(0);                             // choose horizontal addressing mode (only supported by SSD1306)

    if (DISPLAYRotated)                          // display rotated (upside down)?

    {

        oled_command(OLED_COMMAND_SEGREMAP | 0); // set segment re-map: column address 0 is mapped to SEG0

        oled_command(OLED_COMMAND_COMSCANINC);   // set COM output scan direction to normal mode: scan from COM0 to COM[N –1]

    }

    else

    {

        oled_command(OLED_COMMAND_SEGREMAP | 1); // set segment re-map: column address 127 is mapped to SEG0

        oled_command(OLED_COMMAND_COMSCANDEC);   // set COM output scan direction to remapped mode: scan from COM[N-1] to COM0

    }

    oled_command(OLED_COMMAND_SETCOMPINS);       // set COM pins hardware configuration to alternative configuration; disable left/right remap

    oled_command(0x12);

    oled_command(OLED_COMMAND_SETCONTRAST);      // choose contrast

    oled_command(OLEDContrast);

    oled_command(OLED_COMMAND_DISPLAYALLON_RAM); // output follows RAM content

    oled_command(OLED_COMMAND_NORMALDISPLAY);    // non-inverse display

    oled_command(OLED_COMMAND_SETDISPLAYCLOCKDIV);

    oled_command(0x80);                          // set display clock divider to suggested value

    oled_command(OLED_COMMAND_SETPRECHARGE);

    #ifdef OLED_EXTERNALVCC

        oled_command(0x22);

    #else

        oled_command(0xF1);

    #endif

    oled_command(OLED_COMMAND_CHARGEPUMP);       // charge pump must be enabled by the following commands: 8Dh (charge pump setting), 14h (enable charge pump) and AFh (display ON)

    #ifdef OLED_EXTERNALVCC

        oled_command(0x10);

    #else

        oled_command(0x14);

    #endif

    oled_command(OLED_COMMAND_DISPLAYON);        // turn on oled panel

    spi_chipselect(SPI_CS_NONE);

}

void

oled_reset()

{

    // generate reset (high-low-high)

    oled_reset_high();

    delay_us(100);                               // do not use delay_ms() here (timer not operational if this code is called during boot)

    oled_reset_low();

    delay_us(100);                               // do not use delay_ms() here (timer not operational if this code is called during boot)

    oled_reset_high();

    // wait 1ms for display to come out of reset

    delay_us(1000);                              // do not use delay_ms() here (timer not operational if this code is called during boot)

}

Ausschnitt aus dem Header-File:

-------------------------------

#define OLED_COMMAND_W                   128     // display dimensions

#define OLED_COMMAND_H                   64      // display dimensions

#define OLED_COMMAND_PAGES               (OLED_COMMAND_H / 8)

// contrast limits

#define OLED_CONTRAST_MAX                255

// ports

#define OLED_RS_PORT                     PORTD   // port for RS line

#define OLED_RS_PIN                      3       // pin  for RS line

#define OLED_RESET_PORT                  PORTD   // port for /RESET line

#define OLED_RESET_PIN                   7       // pin  for /RESET line

// use charge pump

#undef OLED_EXTERNALVCC

// SSD1306/SH1106 commands

#define OLED_COMMAND_SETCONTRAST         0x81

#define OLED_COMMAND_DISPLAYALLON_RAM    0xA4

#define OLED_COMMAND_DISPLAYALLON        0xA5

#define OLED_COMMAND_NORMALDISPLAY       0xA6

#define OLED_COMMAND_INVERTDISPLAY       0xA7

#define OLED_COMMAND_DISPLAYOFF          0xAE

#define OLED_COMMAND_DISPLAYON           0xAF

#define OLED_COMMAND_SETDISPLAYOFFSET    0xD3

#define OLED_COMMAND_SETCOMPINS          0xDA

#define OLED_COMMAND_SETVCOMDETECT       0xDB

#define OLED_COMMAND_SETDISPLAYCLOCKDIV  0xD5

#define OLED_COMMAND_SETPRECHARGE        0xD9

#define OLED_COMMAND_SETMULTIPLEX        0xA8

#define OLED_COMMAND_SETLOWCOLUMN        0x00

#define OLED_COMMAND_SETHIGHCOLUMN       0x10

#define OLED_COMMAND_SETSTARTLINE        0x40

#define OLED_COMMAND_MEMORYMODE          0x20

#define OLED_COMMAND_COLUMNADDR          0x21

#define OLED_COMMAND_PAGEADDR            0x22

#define OLED_COMMAND_COMSCANINC          0xC0

#define OLED_COMMAND_COMSCANDEC          0xC8

#define OLED_COMMAND_SEGREMAP            0xA0

#define OLED_COMMAND_CHARGEPUMP          0x8D

#define OLED_COMMAND_EXTERNALVCC         0x1

#define OLED_COMMAND_SWITCHCAPVCC        0x2

// SH1106-only commands

#define OLED_COMMAND_SETPAGEADDRESS      0xB0

#define OLED_COMMAND_SETLOCOLUMN         0x00

#define OLED_COMMAND_SETHICOLUMN         0x10

// default contrast

#ifdef OLED_EXTERNALVCC

    #define OLED_DEFAULT_CONTRAST        0x9F

#else

    #define OLED_DEFAULT_CONTRAST        0x10    // low contrast works better than recommended value 0xCF

#endif

// macros for RS (= command/data) and RESET signals

#define hal_oled_rs_high()               OLED_RS_PORT    |=  (1<<OLED_RS_PIN)

#define hal_oled_rs_low()                OLED_RS_PORT    &= ~(1<<OLED_RS_PIN)

#define hal_oled_reset_high()            OLED_RESET_PORT |=  (1<<OLED_RESET_PIN)

#define hal_oled_reset_low()             OLED_RESET_PORT &= ~(1<<OLED_RESET_PIN)

// globals

extern uint8_t         OLEDContrast;

extern uint8_t         OLEDChip;                 // chip type (OLED_SSD1306, OLED_SH1106)

// prototypes

extern void hal_oled_write   (uint8_t data, bool command);

extern void hal_oled_command (uint8_t command);

extern void hal_oled_data    (uint8_t command);

extern void hal_oled_init    (void);

extern void hal_oled_reset   (void);

extern void hal_oled_contrast(uint8_t contrast);

extern void hal_oled_rotate  (bool upsidedown);

extern void hal_oled_on      (void);

extern void hal_oled_off     (void);