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sh1107.js
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sh1107.js
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const REG_CMD = 0x00;
const REG_DATA = 0x40;
const SH1106 = require('sh1106-js');
class SH1107 extends SH1106 {
constructor(opts) {
if (!opts.rpio) {
// SH1106 expects rpio, while this library uses raspi-i2c
opts.rpio = {
i2cBegin() {},
i2cSetSlaveAddress(addr) {},
i2cSetBaudRate() {},
i2cWrite(buffer) {}
};
}
super(opts);
this.opts = opts;
this.i2c = opts.i2c;
this.address = opts.address || 0x3C;
}
async initialize () {
// sequence of bytes to initialize with
// the numbers in the comments refer to the table in the datasheet
// mostly we set everything to the defaults here
const initSeq = this.opts.initSeq || [
// 11. Display OFF/ON
// Turns on OLED panel (1) or
// turns off (0). (POR = AEH which is OFF, use 0xAF for ON)
0xAE,
// 14. Set Display Divide
// Ratio/Oscillator
// Frequency Mode
// This command is used to set
// the frequency of the internal
// display clocks.
// First D5, then (POR = 50H)
0xd5,
0x50,
// 1. Sets 4 lower bits of column address of
// display RAM in register. (POR = 00H)
0x00,
// 2. Sets 4 higher bits of column address
// of display RAM in register. (POR = 10H)
0x10,
// 3.Set memory addressing mode to Page
// Addressing Mode (POR=20H)
0x20,
// 4. The Contrast Control Mode Set (double bytes,
// 0x81, then contrast POR=80H)
0x81,
0x80,
// 5. Set Segment Remap down rotation (POR A0H)
0xa0,
// 6. This command switches multiplex mode to any multiplex ratio
// from 1 to 128. (POR = 7FH )
0xA8,
0x7F,
// 7. Set Entire Display OFF/ON to OFF (POR A4H).
// Entire display on is an option, we disable it here.
0xa4,
// 8. Set Normal Reverse Display to Normal
// indication (POR A6H)
0xa6,
// 9. Set display offset
// This is a double byte
// command that specifies the
// mapping of display start line
// to one of COM0 -127. (POR
// = 00H)
0xd3,
0x00,
// 10. DC-DC Control
// Mode Set
// DC-DC Setting
// Mode Set
0xAD,
0x81,
// 12. Set Page Address
// Specifies page address to
// load display RAM data to
// page address register. (POR
// = B0H)
0xB0,
// 13 Set Common
// Output Scan
// Direction
//
// Scan from COM0 to COM [N
// - 1] (0) or Scan from COM [N
// -1] to COM0 (1). (POR = C0H)
0xc0,
// 15.
// Dis-charge / Pre-charge Period Mode Set
// Dis-charge /Pre-charge Period Data Set
// This command is used to set
// the duration of the
// dis-charge and pre-charge
// period. (POR = 22H)
//
// Double bytes, first D9, then POR 22H
0xd9,
0x22,
// 16.
// VCOM Deselect Level Mode Set
// VCOM Deselect Level Data Set
//
// First DB, then POR 35H
0xdb,
0x35,
// 17. Set Display Start Line
//
// First DC, then POR 00
0xdc,
0x00,
// 18. Read-Modify-Write
// Read-Modify-Write start.
// E0
// 19. End
// EE
// 20. NOP
// E3
0xAF
];
await this._transferCmd(initSeq);
await this.clearDisplay(true);
}
async _transferCmd(cmds) {
if(typeof cmds === 'number') {
cmds = [cmds];
}
await this.write(REG_CMD, Buffer.from(cmds));
}
async _transferData(bufferData) {
// we can't write everything at once, at most DATA_SIZE bytes per
// write call can be sent
for (let i = 0; i < bufferData.length; i += this.DATA_SIZE) {
await this.write(
REG_DATA,
bufferData.slice(
i,
Math.min(bufferData.length, i + this.DATA_SIZE)
)
);
}
}
async write (register, buffer) {
return new Promise((resolve, reject) => {
this.i2c.write(this.address, register, buffer, function (err) {
if (err === null) {
resolve();
return;
}
reject(err);
});
});
}
async setPage(yoffset) {
await this._transferCmd(0xb0+yoffset);
}
async setColumn(xoffset) {
var high4bits = 0x10 + ((xoffset & 0xf0) >> 4);
var low4bits = (xoffset & 0x0f);
await this._transferCmd(low4bits);
await this._transferCmd(high4bits);
}
async setPosition(xoffset, yoffset) {
await this.setPage(yoffset);
await this.setColumn(xoffset);
}
async update(startPage = 0, endPage = this.MAX_PAGE_COUNT - 1) {
for (let page = startPage; page <= endPage; page += 1) {
// tell display we will be writing data for this page, starting
// from column 0
await this.setPosition(0, page);
// write one page of data
const start = page * this.WIDTH;
const end = start + this.WIDTH;
const slice = this.buffer.slice(start, end);
await this._transferData(slice);
}
// now that all bytes are synced, reset dirty state
this.dirtyBytes = [];
}
}
module.exports = SH1107;