/**
* \brief Initialize the OLED controller
*
* Call this function to initialize the hardware interface and the OLED
* controller. When initialization is done the display is turned on and ready
* to receive data.
*/
void ssd1306_init(void)
{
// Initialize delay routine
delay_init();
// Do a hard reset of the OLED display controller
ssd1306_hard_reset();
// Initialize the interface
ssd1306_interface_init();
// Set the reset pin to the default state
port_pin_set_output_level(SSD1306_RES_PIN, true);
// 1/32 Duty (0x0F~0x3F)
ssd1306_write_command(SSD1306_CMD_SET_MULTIPLEX_RATIO);
ssd1306_write_command(0x1F);
// Shift Mapping RAM Counter (0x00~0x3F)
ssd1306_write_command(SSD1306_CMD_SET_DISPLAY_OFFSET);
ssd1306_write_command(0x00);
// Set Mapping RAM Display Start Line (0x00~0x3F)
ssd1306_write_command(SSD1306_CMD_SET_DISPLAY_START_LINE(0x00));
// Set Column Address 0 Mapped to SEG0
ssd1306_write_command(SSD1306_CMD_SET_SEGMENT_RE_MAP_COL127_SEG0);
// Set COM/Row Scan Scan from COM63 to 0
ssd1306_write_command(SSD1306_CMD_SET_COM_OUTPUT_SCAN_DOWN);
// Set COM Pins hardware configuration
ssd1306_write_command(SSD1306_CMD_SET_COM_PINS);
ssd1306_write_command(0x02);
ssd1306_set_contrast(0x8F);
// Disable Entire display On
ssd1306_write_command(SSD1306_CMD_ENTIRE_DISPLAY_AND_GDDRAM_ON);
ssd1306_display_invert_disable();
// Set Display Clock Divide Ratio / Oscillator Frequency (Default => 0x80)
ssd1306_write_command(SSD1306_CMD_SET_DISPLAY_CLOCK_DIVIDE_RATIO);
ssd1306_write_command(0x80);
// Enable charge pump regulator
ssd1306_write_command(SSD1306_CMD_SET_CHARGE_PUMP_SETTING);
ssd1306_write_command(0x14);
// Set VCOMH Deselect Level
ssd1306_write_command(SSD1306_CMD_SET_VCOMH_DESELECT_LEVEL);
ssd1306_write_command(0x40); // Default => 0x20 (0.77*VCC)
// Set Pre-Charge as 15 Clocks & Discharge as 1 Clock
ssd1306_write_command(SSD1306_CMD_SET_PRE_CHARGE_PERIOD);
ssd1306_write_command(0xF1);
ssd1306_display_on();
}
void
demo_set_contrast (void)
{
for (uint16_t contrast = 0; contrast <= 255; contrast++)
{
PORTB ^= (1 << PB0);
ssd1306_set_contrast (contrast);
_delay_ms (DEFAULT_DELAY/200);
}
}
