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Also change VCOMDeselect when changing contrast

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This commit is contained in:
penfold42 2018-06-23 12:52:54 +10:00
parent bd8a31604c
commit f0e90cf385
3 changed files with 31 additions and 23 deletions
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51
src/SSD1306.cpp
View file

@ -28,6 +28,7 @@ extern "C"
#define SSD1306_CMD_SET_MEMORY_ADDRESSING_MODE 0x20
#define SSD1306_CMD_SET_COLUMN_ADDRESS 0x21
#define SSD1306_CMD_SET_PAGE_ADDRESS 0x22
#define SSD1306_CMD_DEACTIVATE_SCROLL 0x2E
#define SSD1306_CMD_ACTIVATE_SCROLL 0x2F
@ -65,24 +66,24 @@ SSD1306::SSD1306(int BSCMaster, u8 address, int flip, int type)
RPI_I2CInit(BSCMaster, 1);
// SSD1306 data sheet configuration flow
SendCommand(SSD1306_CMD_DISPLAY_OFF);
SendCommand(SSD1306_CMD_MULTIPLEX_RATIO);
SendCommand(SSD1306_CMD_DISPLAY_OFF); // 0xAE
SendCommand(SSD1306_CMD_MULTIPLEX_RATIO); // 0xA8
SendCommand(0x3F); // SSD1306_LCDHEIGHT - 1
SendCommand(SSD1306_CMD_SET_DISPLAY_OFFSET);
SendCommand(SSD1306_CMD_SET_DISPLAY_OFFSET); // 0xD3 Vertical scroll position
SendCommand(0x00); // no Offset
SendCommand(SSD1306_CMD_SET_START_LINE | 0x0);
SendCommand(SSD1306_CMD_SET_START_LINE | 0x0); // 0x40
if (flip) {
SendCommand(0xA0); // No Segment Re-Map
SendCommand(0xC0); // No COM Output Scan Direction
} else {
SendCommand(0xA1); // Set Segment Re-Map
SendCommand(0xC8); // Set COM Output Scan Direction
SendCommand(0xA1); // Set Segment Re-Map (horizontal flip)
SendCommand(0xC8); // Set COM Output Scan Direction (vertical flip)
}
SendCommand(SSD1306_CMD_SET_COM_PINS); // Layout and direction
SendCommand(SSD1306_CMD_SET_COM_PINS); // 0xDA Layout and direction
SendCommand(0x12);
SendCommand(SSD1306_CMD_SET_CONTRAST_CONTROL);
@ -90,11 +91,12 @@ SSD1306::SSD1306(int BSCMaster, u8 address, int flip, int type)
SendCommand(SSD1306_CMD_ENTIRE_DISPLAY_ON);
SendCommand(SSD1306_CMD_NORMAL_DISPLAY);
SendCommand(0xD5);
SendCommand(0x80);
SendCommand(SSD1306_CMD_NORMAL_DISPLAY); // 0xA6 = non inverted
SendCommand(SSD1306_CMD_SET_PRE_CHARGE_PERIOD);
// SendCommand(0xD5); // CLOCK_DIVIDER_FREQ
// SendCommand(0x80); // 7:4 oscillator f, 3:0 divider
SendCommand(SSD1306_CMD_SET_PRE_CHARGE_PERIOD); // 0xD9
SendCommand(0xF1);
SendCommand(SSD1306_CMD_SET_VCOMH_DESELECT_LEVEL);
@ -106,25 +108,23 @@ SSD1306::SSD1306(int BSCMaster, u8 address, int flip, int type)
SendCommand(SSD1306_ENABLE_CHARGE_PUMP); // Enable charge pump regulator
SendCommand(0x14); // external = 0x10 internal = 0x14
/*
// only for page mode addressing
SendCommand(0x00); // Set Lower Column Start Address
SendCommand(0x10); // Set Higher Column Start Address
SendCommand(0xB0); // Set Page Start Address for Page Addressing Mode
*/
SendCommand(SSD1306_CMD_SET_MEMORY_ADDRESSING_MODE); // Set Memory Addressing Mode
SendCommand(0x00); // 00 - Horizontal Addressing Mode
SendCommand(0x21); // Set Column Address (only for horizontal or vertical mode)
SendCommand(0x00);
SendCommand(0x7F);
SendCommand(SSD1306_CMD_SET_COLUMN_ADDRESS); // 0x21 Set Column Address (only for horizontal or vertical mode)
SendCommand(0x00); // start 0
SendCommand(0x7F); // end 127
SendCommand(SSD1306_CMD_SET_PAGE_ADDRESS);
SendCommand(0x00);
SendCommand(0x07);
SendCommand(SSD1306_CMD_SET_PAGE_ADDRESS); // 0x22
SendCommand(0x00); // start 0
SendCommand(0x07); // end 7 (so 8 vertical bytes == 64 row display)
SendCommand(SSD1306_CMD_DEACTIVATE_SCROLL);
}
@ -226,6 +226,13 @@ void SSD1306::SetContrast(u8 value)
{
SendCommand(SSD1306_CMD_SET_CONTRAST_CONTROL);
SendCommand(value);
SetVCOMDeselect( value >> 5);
}
void SSD1306::SetVCOMDeselect(u8 value)
{
SendCommand(SSD1306_CMD_SET_VCOMH_DESELECT_LEVEL);
SendCommand( (value & 7) << 4 );
}
void SSD1306::Plottext(int x, int y, char* str, bool inverse)

1
src/SSD1306.h
View file

@ -80,6 +80,7 @@ public:
void DisplayOn();
void DisplayOff();
void SetContrast(u8 value);
void SetVCOMDeselect(u8 value);
void ClearScreen();
void RefreshScreen();

2
src/main.cpp
View file

@ -496,7 +496,7 @@ void UpdateScreen()
if (screenLCD)
{
screenLCD->PrintText(false, 0, 0, tempBuffer, RGBA(0xff, 0xff, 0xff, 0xff), RGBA(0xff, 0xff, 0xff, 0xff));
// screenLCD->SetContrast(3*track);
// screenLCD->SetContrast(255.0/79.0*track);
screenLCD->RefreshRows(0, 2);
}