A class for managing SSD1306 controlled LCD´s (cheap 128x64 models, 0.96'')
Dependents: mbed_ssd1306 USB_meter_SD_file_number_filtro_for EscanerRf escaner_RTOS ... more
ssd1306.cpp
- Committer:
- rodriguj
- Date:
- 2017-11-01
- Revision:
- 3:bb6fba3e84ff
- Parent:
- 2:7f1160c1a741
- Child:
- 4:35757c8b7625
File content as of revision 3:bb6fba3e84ff:
/* * ssd1306.cpp * * Created on: 20 oct. 2017 * Author: Miguel Angel Rodriguez Jodar * * Based upon Adafruit library. * GPL licensed. * */ #include "ssd1306.h" #include "mbed.h" static const char charset[2048] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7E, 0x81, 0x95, 0xB1, 0xB1, 0x95, 0x81, 0x7E, 0x7E, 0xFF, 0xEB, 0xCF, 0xCF, 0xEB, 0xFF, 0x7E, 0x0E, 0x1F, 0x3F, 0x7E, 0x3F, 0x1F, 0x0E, 0x00, 0x08, 0x1C, 0x3E, 0x7F, 0x3E, 0x1C, 0x08, 0x00, 0x38, 0x3A, 0x9F, 0xFF, 0x9F, 0x3A, 0x38, 0x00, 0x18, 0x3C, 0xBE, 0xFF, 0xBE, 0x3C, 0x18, 0x00, 0x00, 0x00, 0x18, 0x3C, 0x3C, 0x18, 0x00, 0x00, 0xFF, 0xFF, 0xE7, 0xC3, 0xC3, 0xE7, 0xFF, 0xFF, 0x00, 0x3C, 0x66, 0x42, 0x42, 0x66, 0x3C, 0x00, 0xFF, 0xC3, 0x99, 0xBD, 0xBD, 0x99, 0xC3, 0xFF, 0x70, 0xF8, 0x88, 0x88, 0xFD, 0x7F, 0x07, 0x0F, 0x00, 0x4E, 0x5F, 0xF1, 0xF1, 0x5F, 0x4E, 0x00, 0xC0, 0xE0, 0xFF, 0x7F, 0x05, 0x05, 0x07, 0x07, 0xC0, 0xFF, 0x7F, 0x05, 0x05, 0x65, 0x7F, 0x3F, 0x5A, 0x5A, 0x3C, 0xE7, 0xE7, 0x3C, 0x5A, 0x5A, 0x7F, 0x3E, 0x3E, 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0x0F, 0x38, 0x7C, 0x44, 0x6C, 0x38, 0x6C, 0x44, 0x00, 0x7E, 0x7F, 0x01, 0x09, 0x5F, 0x76, 0x20, 0x00, 0x7F, 0x7F, 0x01, 0x01, 0x01, 0x03, 0x03, 0x00, 0x04, 0x7C, 0x7C, 0x04, 0x7C, 0x7C, 0x04, 0x00, 0x63, 0x77, 0x5D, 0x49, 0x41, 0x63, 0x63, 0x00, 0x38, 0x7C, 0x44, 0x7C, 0x3C, 0x04, 0x04, 0x00, 0x80, 0xFC, 0x7C, 0x40, 0x40, 0x7C, 0x3C, 0x00, 0x04, 0x06, 0x02, 0x7E, 0x7C, 0x06, 0x02, 0x00, 0x00, 0x99, 0xBD, 0xE7, 0xE7, 0xBD, 0x99, 0x00, 0x1C, 0x3E, 0x6B, 0x49, 0x6B, 0x3E, 0x1C, 0x00, 0x4C, 0x7E, 0x73, 0x01, 0x73, 0x7E, 0x4C, 0x00, 0x00, 0x30, 0x78, 0x4A, 0x4F, 0x7D, 0x39, 0x00, 0x18, 0x3C, 0x24, 0x3C, 0x3C, 0x24, 0x3C, 0x18, 0x98, 0xFC, 0x64, 0x3C, 0x3E, 0x27, 0x3D, 0x18, 0x00, 0x1C, 0x3E, 0x6B, 0x49, 0x49, 0x49, 0x00, 0x7C, 0x7E, 0x02, 0x02, 0x02, 0x7E, 0x7C, 0x00, 0x2A, 0x2A, 0x2A, 0x2A, 0x2A, 0x2A, 0x2A, 0x00, 0x00, 0x44, 0x44, 0x5F, 0x5F, 0x44, 0x44, 0x00, 0x00, 0x40, 0x51, 0x5B, 0x4E, 0x44, 0x40, 0x00, 0x00, 0x40, 0x44, 0x4E, 0x5B, 0x51, 0x40, 0x00, 0x00, 0x00, 0x00, 0xFE, 0xFF, 0x01, 0x07, 0x06, 0x60, 0xE0, 0x80, 0xFF, 0x7F, 0x00, 0x00, 0x00, 0x00, 0x08, 0x08, 0x2A, 0x2A, 0x08, 0x08, 0x00, 0x24, 0x36, 0x12, 0x36, 0x24, 0x36, 0x12, 0x00, 0x00, 0x06, 0x0F, 0x09, 0x0F, 0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0x08, 0x00, 0x00, 0x00, 0x10, 0x30, 0x70, 0xC0, 0xFF, 0xFF, 0x01, 0x01, 0x00, 0x01, 0x1F, 0x1E, 0x01, 0x1F, 0x1E, 0x00, 0x00, 0x11, 0x19, 0x1D, 0x17, 0x12, 0x00, 0x00, 0x00, 0x00, 0x3C, 0x3C, 0x3C, 0x3C, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; SSD1306::SSD1306 (PinName sda, PinName scl, char ssd1306_addr) { idxfb = 0; fb = new char[1024]; if (!fb) { printf ("SSD1306: Framebuffer allocation failed!\r\n"); for (;;) { } } bus = new I2C (sda, scl); ssd1306_i2c_addr = ssd1306_addr; do_not_delete_bus = 0; #ifdef SSD1306_DEBUG printf ("SSD1306 debug: fb = 0x%08.8X\r\n", fb); printf ("SSD1306 debug: I2C addr = 0x%02.2X\r\n", ssd1306_i2c_addr); #endif } SSD1306::SSD1306 (I2C &busi2c, char ssd1306_addr) { bus = &busi2c; idxfb = 0; fb = new char[1024]; if (!fb) { printf ("SSD1306: Framebuffer allocation failed!\r\n"); for (;;) { } } ssd1306_i2c_addr = ssd1306_addr; do_not_delete_bus = 1; } void SSD1306::speed (I2CSpeed spd) { switch (spd) { case Low: bus->frequency(100000); break; case Medium: bus->frequency(400000); break; case Fast: bus->frequency(1000000); break; } } char SSD1306::scan (void) { int addr; int res; char i2caddr = 0; for (addr=0; addr<256; addr++) { res = bus->write (addr, NULL, 0); if (res == 0) i2caddr = addr & 0xFE; } return i2caddr; } int SSD1306::command_data (char c, char c_or_d, char lastitem) { int res; bus->start(); res = bus->write(ssd1306_i2c_addr); if (!res) goto terminate_transaction; res = bus->write(c_or_d | lastitem); if (!res) goto terminate_transaction; res = bus->write(c); if (!res) goto terminate_transaction; terminate_transaction: bus->stop(); return res; } int SSD1306::command (char c) { return command_data (c, IS_COMMAND, IS_LAST); } int SSD1306::data (char d) { return command_data (d, IS_DATA, IS_LAST); } int SSD1306::init (void) { static const char comando[] = {0x80, SSD1306_DISPLAYOFF, 0x80, SSD1306_CHARGEPUMP, 0x80, 0x14, 0x80, SSD1306_MEMORYMODE, 0x80, 0x00, 0x80, SSD1306_SEGREMAP | 0x1, 0x80, SSD1306_COMSCANDEC, 0x80, SSD1306_SETCONTRAST, 0x80, 0x7F, 0x00, SSD1306_DISPLAYON }; return bus->write (ssd1306_i2c_addr, comando, sizeof comando); } void SSD1306::scroll (bool refresh) { int i; for (i=128; i<1024; i++) fb[i-128] = fb[i]; for (i=896; i<1024; i++) fb[i] = 0; if (refresh) display(); } void SSD1306::locate (char row, char column) { idxfb = row*128+column*8; } void SSD1306::putchar (char c, bool refresh) { int idx,i; idx = c*8; if (idxfb == 1024) { scroll(refresh); idxfb = 896; } for (i=0; i<8; i++) { fb[idxfb] = charset[idx+i]; idxfb++; } if (refresh) display(); } void SSD1306::puts (char *s, bool refresh) { while (*s) putchar (*s++, refresh); } void SSD1306::printf (char *fmt,...) { char *s = new char[129]; va_list args; va_start (args, fmt); vsnprintf (s, 128, fmt, args); puts (s, false); delete[] s; va_end (args); } void SSD1306::display(void) { int i; command (0xb0); command (SSD1306_SETLOWCOLUMN | 0x0); // low col = 0 command (SSD1306_SETHIGHCOLUMN | 0x0); // hi col = 0 command (SSD1306_SETSTARTLINE | 0x0); // line #0 bus->start(); bus->write (ssd1306_i2c_addr); bus->write (0x40); for (i=0; i<1024; i++) { bus->write (fb[i]); } bus->stop(); } void SSD1306::set_contrast (char v) { command (SSD1306_SETCONTRAST); command (v); } void SSD1306::cls (char *bkground, bool refresh) { int i; if (!bkground) { for (i=0; i<1024; i++) fb[i] = 0; } else { for (i=0; i<1024; i++) fb[i] = bkground[i]; } idxfb = 0; if (refresh) display(); } void SSD1306::plot (char x, char y, PlotStyle modo, bool refresh) { x = x % 128; y = y % 64; switch (modo) { case Normal: fb[(y/8)*128+x] |= (1<<(y%8)); break; case Inverse: fb[(y/8)*128+x] &= ~(1<<(y%8)); break; case Xor: fb[(y/8)*128+x] ^= (1<<(y%8)); break; } if (refresh) display(); } bool SSD1306::point (char x, char y) { x = x % 128; y = y % 64; if ( fb[(y/8)*128+x] & (1<<(y%8)) ) return true; else return false; } void SSD1306::line (char x0, char y0, char x1, char y1, PlotStyle modo, bool refresh) { int dx = abs (x1 - x0), sx = x0 < x1 ? 1 : -1; int dy = -abs (y1 - y0), sy = y0 < y1 ? 1 : -1; int err = dx + dy, e2; /* error value e_xy */ for (;;) { /* loop */ plot (x0, y0, modo, false); if (x0 == x1 && y0 == y1) break; e2 = 2 * err; if (e2 >= dy) { err += dy; /* e_xy+e_x > 0 */ x0 += sx; } if (e2 <= dx) { err += dx; /* e_xy+e_y < 0 */ y0 += sy; } } if (refresh) display(); } void SSD1306::circle (char x0, char y0, char r, PlotStyle modo, bool refresh) { int x = r-1; int y = 0; int dx = 1; int dy = 1; int err = dx - 2*r; while (x >= y) { plot (x0 + x, y0 + y, modo); plot (x0 + y, y0 + x, modo); plot (x0 - y, y0 + x, modo); plot (x0 - x, y0 + y, modo); plot (x0 - x, y0 - y, modo); plot (x0 - y, y0 - x, modo); plot (x0 + y, y0 - x, modo); plot (x0 + x, y0 - y, modo); if (err <= 0) { y++; err += dy; dy += 2; } if (err > 0) { x--; dx += 2; err += dx - 2*r; } } if (refresh) display(); }