UniGraphic-Fork for ST7920-LCD-controller and SH1106. Tested with 128x64 LCD with SPI and 128x64-OLED with IIC
Dependents: UniGraphic-St7920-Test AfficheurUTILECO
Fork of UniGraphic by
Fork of the UniGraphic-Library for monochrome LCDs with ST7920 controller and 128x64-IIC-OLED-Display with SH1106-Controller
Had to adapt LCD for following reasons:
- Give access to screenbuffer buffer[] to parent class
- pixel() and pixel_read() as they are hardware-dependent
- added reset-pin to IIC-Interface
GraphicDisplay:: sends buffer to LCD when auto_update is set to true.
Testprogram for ST7920 can be found here:
https://developer.mbed.org/users/charly/code/UniGraphic-St7920-Test/
Inits/ST7920.cpp
- Committer:
- charly
- Date:
- 2017-05-21
- Revision:
- 35:b8d3f1e68000
- Parent:
- 34:a9648877491f
File content as of revision 35:b8d3f1e68000:
/* mbed UniGraphic library - Device specific class * for ST7920 by Karl Zweimueller https://developer.mbed.org/users/charly/ * Copyright (c) 2015 Giuliano Dianda * Released under the MIT License: http://mbed.org/license/mit */ #include "Protocols.h" #include "ST7920.h" /*this is a quite standard config for ST7920 and similars*/ ////////////////////////////////////////////////////////////////////////////////// // display settings /////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////// #define IC_X_SEGS 256 // ST7920 SEG has range 64-256 #define IC_Y_COMS 32 // ST7920 COM has 32 COMS fix // see ST7920_v4.0 page 1/49 ST7920::ST7920(proto_t displayproto, PortName port, PinName CS, PinName reset, PinName DC, PinName WR, PinName RD, const char *name, unsigned int LCDSIZE_X, unsigned int LCDSIZE_Y) : LCD(displayproto, port, CS, reset, DC, WR, RD, LCDSIZE_X, LCDSIZE_Y, IC_X_SEGS, IC_Y_COMS, name) { hw_reset(); BusEnable(true); init(); cls(); set_orientation(1); locate(0,0); } ST7920::ST7920(proto_t displayproto, PinName* buspins, PinName CS, PinName reset, PinName DC, PinName WR, PinName RD, const char *name, unsigned int LCDSIZE_X, unsigned int LCDSIZE_Y) : LCD(displayproto, buspins, CS, reset, DC, WR, RD, LCDSIZE_X, LCDSIZE_Y, IC_X_SEGS, IC_Y_COMS, name) { hw_reset(); BusEnable(true); init(); cls(); set_orientation(1); locate(0,0); } ST7920::ST7920(proto_t displayproto, int Hz, PinName mosi, PinName miso, PinName sclk, PinName CS, PinName reset, PinName DC, const char *name, unsigned int LCDSIZE_X, unsigned int LCDSIZE_Y) : LCD(displayproto, Hz, mosi, miso, sclk, CS, reset, DC, LCDSIZE_X, LCDSIZE_Y, IC_X_SEGS, IC_Y_COMS, name) { hw_reset(); BusEnable(true); init(); cls(); set_orientation(1); locate(0,0); } //WriteInstructionRegister IR void ST7920::wir(unsigned char data) { /* Timing Diagram of Serial Mode Data Transfer on p.20 |-------------------|------------------------|------------------------| | Synchronizing | 1-st Byte Higher data | 2-nd Byte Lower data | |-------------------|------------------------|------------------------| | 1 1 1 1 1 RW RS 0 | D7 D6 D5 D4 0 0 0 0| D3 D2 D1 D0 0 0 0 0| |-------------------|------------------------|------------------------| */ wr_data8(0xf8); // Sync. - 1 1 1 1 1 0 0 0 RW=0,RS=0 wr_data8(data & 0xf0); // HighData - D7 D6 D5 D4 0 0 0 0 wr_data8(data << 4); // LowData - D3 D2 D1 D0 0 0 0 0 if (data == 0x01) { // Display Clear wait_ms(1.6); } else { //everything else wait_us(72); } } //WriteDataRegister DR void ST7920::wdr(unsigned char data) { wr_data8(0xfa); // Sync. - 1 1 1 1 1 0 1 0 RW=0 RS=1 wr_data8(data & 0xf0); // HighData - D7 D6 D5 D4 0 0 0 0 wr_data8(data << 4); // LowData - D3 D2 D1 D0 0 0 0 0 wait_us(72); } // init the lcd controller // init sequence is manufacturer specific void ST7920::init() { /* Start Initial Sequence ----------------------------------------------------*/ wait_ms(40); // this is for a 128x64 LCD with SPI. // parallel-mode not implemented! //Function set [DL=1 8-bit interface; DL=0 4-bit interface; // RE=1: extended instruction; RE=0: basic instruction] // RS RW DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 // 0 0 0 0 1 DL X RE 0 0 // DisplayClear wir(0x01); // ReturnHome wir(0x02); // FunctionSet: BasicIR wir(0x30); // FunctionSet: ExtendedIR //wir(0x34); //Function set [DL=1 8-bit interface; DL=0 4-bit interface; // RE=1: extended instruction; RE=0: basic instruction] // RS RW DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 // 0 0 0 0 1 DL X RE 0 0 // // ExtFunctionSet Display OFF //wir(0x30); // DisplayControl [D=1: Display ON; C=1: Cursor ON; B=1: Character Blink ON] // RS RW DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 // 0 0 0 0 0 0 1 D C B // DisplayControl: Display ON CharacterBlink ON Cursor=On //wir(0x0f); // DisplayControl: Display ON CharacterBlink OFF Cursor=Off wir(0x0c); // Display Clear wir(0x01); //wait_ms(10); //Set cursor position and display shift when doing write or read operation // RS RW DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 // 0 0 0 0 0 0 0 1 I/D S // EntryModeSet: Increase, Shift right wir(0x06); } void ST7920::mirrorXY(mirror_t mode) { //not supported by hardware } void ST7920::cls(void) { //DisplayClear wir(0x01); //ReturnHome wir(0x02); memset(buffer,0x00,sizeX()*(sizeY()>>3)); // clear display buffer } // write the full screenbuffer to the LCD GDRAM void ST7920::copy_to_lcd(void) { int i,j; // Change to Extended InstructionSet //FunctionSet: Extended wir(0x36); for(i=0; i<32; i++) { //32 Doppelzeilen // SetGDRAM-Adress AC: 0 //Vertical-Adr wir(0x80+i); //Horizontal-Adr wir(0x80); //write 16 Double-Bytes of data //upper part of Display for (j=0; j<8; j++) { wdr(buffer[(i*16) + (j*2)]); wdr(buffer[(i*16) + (j*2) +1]); //if (i==0) {wdr(0xAA); wdr(0xAA);}else {wdr(0x00); wdr(0x00);}; } //lower part of Display for (j=0; j<8; j++) { wdr(buffer[(i*16)+512 + (j*2)]); wdr(buffer[(i*16)+512 + (j*2) +1]); //if (i==31) {wdr(0xAA); wdr(0xAA);}else {wdr(0x00); wdr(0x00);}; } /* //obere Displayhälfte wdr(0xFF); wdr(0x00); wdr(0x00); wdr(0xAA); wdr(0xF0); wdr(0xAA); wdr(0xF0); wdr(0xAA); wdr(0xF0); wdr(0xAA); wdr(0xF0); wdr(0xAA); wdr(0xF0); wdr(0xAA); wdr(0xFF); //Zeile fertig // untere Displayhälfte wdr(0x00); wdr(0x00); wdr(0xFF); wdr(0xFF); wdr(0xAA); wdr(0xF0); wdr(0xAA); wdr(0xF0); wdr(0xAA); wdr(0xF0); wdr(0xAA); wdr(0xF0); wdr(0xAA); wdr(0xF0); wdr(0x00); wdr(0xFF); */ } //back to BasicInstructionSet wir(0x30); } void ST7920::set_contrast(int o) { //not supported by hardware } void ST7920::invert(unsigned char o) { //not supported by hardware } void ST7920::wr_grambuf(unsigned short* data, unsigned int lenght) { // not needed, not supported } void ST7920::wr_gram(unsigned short data) { // not needed, not supported } void ST7920::wr_gram(unsigned short data, unsigned int count) { // not needed, not supported } void ST7920::wr_data16(unsigned short data) { // not needed, not supported } void ST7920::wr_cmd16(unsigned short cmd) { // not needed, not supported } void ST7920::wr_cmd8(unsigned char cmd) { // not needed, not supported } unsigned short ST7920::rd_gram(bool convert) { // not needed, not supported return(0); } unsigned int ST7920::rd_reg_data32(unsigned char reg) { // not needed, not supported return(0); } unsigned int ST7920::rd_extcreg_data32(unsigned char reg, unsigned char SPIreadenablecmd) { // not needed, not supported return(0); }