Initialize display cmd #76
Description
Why initialize display cmd is big difference from with the previous repo and u8g2 too. Where does it come from?
https://github.com/adafruit/Adafruit_CircuitPython_SSD1306/blob/main/adafruit_ssd1306.py#L116
# self.poweron
0xAE | 0x01
# self.init_display
0xAE, # off
# address setting
0x20,
0x10 # Page Addressing Mode
if self.page_addressing
else 0x00, # Horizontal Addressing Mode
# resolution and layout
0x40,
0xA0 | 0x01, # column addr 127 mapped to SEG0
0xA8,
self.height - 1,
0xC0 | 0x08, # scan from COM[N] to COM0
0xD3,
0x00,
0xDA,
0x02 if self.width > 2 * self.height else 0x12,
# timing and driving scheme
0xD5,
0x80,
0xD9,
0x22 if self.external_vcc else 0xF1,
0xDB,
0x30, # 0.83*Vcc # n.b. specs for ssd1306 64x32 oled screens imply this should be 0x40
# display
0x81,
0xFF, # maximum
0xA4, # output follows RAM contents
0xA6, # not inverted
0xAD,
0x30, # enable internal IREF during display on
# charge pump
0x8D,
0x10 if self.external_vcc else 0x14,
0xAE | 0x01, # display onhttps://github.com/adafruit/micropython-adafruit-ssd1306/blob/master/ssd1306.py#L40
# self.init_display
0xAE | 0x00, # off
# address setting
0x20, 0x00, # horizontal
# resolution and layout
0x40 | 0x00,
0xA0 | 0x01, # column addr 127 mapped to SEG0
0xA8, self.height - 1,
0xC0 | 0x08, # scan from COM[N] to COM0
0xD3, 0x00,
0xDA, 0x02 if self.height == 32 else 0x12,
# timing and driving scheme
0xD5, 0x80,
0xD9, 0x22 if self.external_vcc else 0xF1,
0xDB, 0x30, # 0.83*Vcc
# display
0x81, 0xFF, # maximum
0xA4, # output follows RAM contents
0xA6, # not inverted
# charge pump
0x8D, 0x10 if self.external_vcc else 0x14,
0xAE | 0x01 # on_INIT_SEQUENCE = (
b"\xAE\x00" # DISPLAY_OFF
b"\x20\x01\x00" # Set memory addressing to horizontal mode.
b"\x81\x01\xcf" # set contrast control
b"\xA1\x00" # Column 127 is segment 0
b"\xA6\x00" # Normal display
b"\xc8\x00" # Normal display
b"\xA8\x01\x3f" # Mux ratio is 1/64
b"\xd5\x01\x80" # Set divide ratio
b"\xd9\x01\xf1" # Set pre-charge period
b"\xda\x01\x12" # Set com configuration
b"\xdb\x01\x40" # Set vcom configuration
b"\x8d\x01\x14" # Enable charge pump
b"\xAF\x00" # DISPLAY_ON
)
https://github.com/adafruit/Adafruit_SSD1306/blob/master/Adafruit_SSD1306.cpp#L564
// Init sequence
static const uint8_t PROGMEM init1[] = {SSD1306_DISPLAYOFF, // 0xAE
SSD1306_SETDISPLAYCLOCKDIV, // 0xD5
0x80, // the suggested ratio 0x80
SSD1306_SETMULTIPLEX}; // 0xA8
ssd1306_commandList(init1, sizeof(init1));
ssd1306_command1(HEIGHT - 1);
static const uint8_t PROGMEM init2[] = {SSD1306_SETDISPLAYOFFSET, // 0xD3
0x0, // no offset
SSD1306_SETSTARTLINE | 0x0, // line #0
SSD1306_CHARGEPUMP}; // 0x8D
ssd1306_commandList(init2, sizeof(init2));
ssd1306_command1((vccstate == SSD1306_EXTERNALVCC) ? 0x10 : 0x14);
static const uint8_t PROGMEM init3[] = {SSD1306_MEMORYMODE, // 0x20
0x00, // 0x0 act like ks0108
SSD1306_SEGREMAP | 0x1,
SSD1306_COMSCANDEC};
ssd1306_commandList(init3, sizeof(init3));
uint8_t comPins = 0x02;
contrast = 0x8F;
if ((WIDTH == 128) && (HEIGHT == 32)) {
comPins = 0x02;
contrast = 0x8F;
} else if ((WIDTH == 128) && (HEIGHT == 64)) {
comPins = 0x12;
contrast = (vccstate == SSD1306_EXTERNALVCC) ? 0x9F : 0xCF;
} else if ((WIDTH == 96) && (HEIGHT == 16)) {
comPins = 0x2; // ada x12
contrast = (vccstate == SSD1306_EXTERNALVCC) ? 0x10 : 0xAF;
} else {
// Other screen varieties -- TBD
}
ssd1306_command1(SSD1306_SETCOMPINS);
ssd1306_command1(comPins);
ssd1306_command1(SSD1306_SETCONTRAST);
ssd1306_command1(contrast);
ssd1306_command1(SSD1306_SETPRECHARGE); // 0xd9
ssd1306_command1((vccstate == SSD1306_EXTERNALVCC) ? 0x22 : 0xF1);
static const uint8_t PROGMEM init5[] = {
SSD1306_SETVCOMDETECT, // 0xDB
0x40,
SSD1306_DISPLAYALLON_RESUME, // 0xA4
SSD1306_NORMALDISPLAY, // 0xA6
SSD1306_DEACTIVATE_SCROLL,
SSD1306_DISPLAYON}; // Main screen turn on
ssd1306_commandList(init5, sizeof(init5));
TRANSACTION_END