Erik van de Coevering
A simple library for SSH1106 controlled GLCDs
Diff: SSH1106.cpp
- Revision:
- 0:3cd0a11a2f91
- Child:
- 1:ac9efaadd666
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/SSH1106.cpp Mon Dec 19 15:02:30 2016 +0000
@@ -0,0 +1,197 @@
+/**
+ * This is a simple library for SSH1106 controlled graphic LCD's.
+ * Written for a cheap 1.3" OLED GLCD
+ * See http://www.dx.com/p/open-smart-1-8-128-64-lcd-display-breakout-module-w-blue-backlit-444694
+ *
+ * Written by: Erik van de Coevering
+ * With thanks to Tim Barr from whom I've reused some code
+ * Use this code in whatever way you like, as long as it stays free of charge!
+ */
+
+#include "SSH1106.h"
+
+SSH1106::SSH1106(SPI &lcd, DigitalOut &lcd_cs, DigitalOut &lcd_cd, DigitalOut &lcd_rst)
+{
+ _lcd = &lcd;
+ _lcd_cs = &lcd_cs;
+ _lcd_cd = &lcd_cd;
+ _lcd_rst = &lcd_rst;
+}
+
+void SSH1106::init()
+{
+ _lcd_cs->write(1);
+ _lcd->frequency(24000000); // Abusing SPI to save some time.. Try a lower freq if this doesn't work
+ _lcd->format(8,3);
+ _lcd_cs->write(0); // enable SPI
+ _lcd_cd->write(0); // COMMAND mode
+
+ _lcd_rst->write(0);
+ wait_ms(100);
+ _lcd_rst->write(1);
+
+ wait_ms(50);
+
+ _lcd->write(0xAE); // Display off
+ _lcd->write(0x02); // Set lower column address
+ _lcd->write(0x10); // Set higher column address
+ _lcd->write(0x40); // Set display start line
+ _lcd->write(0xB0); // Set page address
+ _lcd->write(0x81); // Set contrast to
+ _lcd->write(0x80); // 128
+ _lcd->write(0xA1); // Segment remap
+ _lcd->write(0xA6); // Inverse: normal (A7 = inverse)
+ _lcd->write(0xA8); // Multiplex ratio
+ _lcd->write(0x3F); // Duty = 1/32
+ _lcd->write(0xAD); // Charge pump enable
+ _lcd->write(0x8B); // External VCC
+ _lcd->write(0x33); // VPP: 9v
+ _lcd->write(0xC8); // Com scan direction
+ _lcd->write(0xD3); // Display offset
+ _lcd->write(0x00); // 0x20
+ _lcd->write(0xD5); // Osc division
+ _lcd->write(0x80);
+ _lcd->write(0xD9); // Pre-charge period
+ _lcd->write(0x1F); // 0x22
+ _lcd->write(0xDA); // Set com pins
+ _lcd->write(0x12);
+ _lcd->write(0xDB); // Set vcomh
+ _lcd->write(0x40);
+ _lcd->write(0xAF); // Display ON
+ _lcd_cs->write(1);
+ _lcd_cd->write(1);
+
+}
+
+void SSH1106::setContrast(char contrast)
+{
+ _lcd_cs->write(0); // enable SPI
+ _lcd_cd->write(0); // command mode
+ _lcd->write(0x81); // command to set contrast
+ _lcd->write(contrast); // set contrast
+ _lcd_cs->write(1);
+ _lcd_cd->write(1);
+ }
+
+void SSH1106::setCursor(char column, char line)
+{
+ int i, j;
+ column = column+2; // column+4
+
+ i=(column&0xF0)>>4;
+ j=column&0x0F;
+ _lcd_cd->write(0);
+ _lcd->write(0xb0+line);
+ _lcd->write(0x10+i);
+ _lcd->write(j);
+ _lcd_cd->write(1);
+}
+
+void SSH1106::clear()
+{
+ _lcd_cs->write(0);
+ _lcd_cd->write(1);
+
+ for(unsigned short j = 0; j < 8; j++) {
+ SSH1106::setCursor(0, j);
+ for(unsigned short i = 0; i < 128 ; i++) {
+ _lcd->write(0x00);
+ }
+ }
+
+ SSH1106::setCursor(0, 0);
+
+ _lcd_cs->write(1);
+}
+
+void SSH1106::writeText2d(char column, char page, const char font_address[96][8], const char *text, int size)
+{
+ _lcd_cs->write(0);
+ SSH1106::setCursor(column, page);
+ for(int i=0; i<size; i++) {
+ for(int a=0; a<8; a++) {
+ _lcd->write((font_address[(text[i]-32)][a]));
+ }
+ }
+ _lcd_cs->write(1);
+}
+
+void SSH1106::writeText(char column, char page, const char *font_address, const char *text, const uint8_t size)
+{
+ // Position of character data in memory array
+ uint16_t pos_array;
+ // temporary column, page address, and column_cnt are used
+ // to stay inside display area
+ uint8_t i,y, column_cnt = 0;
+ uint8_t count = 0;
+
+ // font information, needed for calculation
+ uint8_t start_code, last_code, width, page_height, bytes_p_char;
+
+ uint8_t *txtbuffer;
+
+ start_code = font_address[2]; // get first defined character
+ last_code = font_address[3]; // get last defined character
+ width = font_address[4]; // width in pixel of one char
+ page_height = font_address[6]; // page count per char
+ bytes_p_char = font_address[7]; // bytes per char
+
+ _lcd_cs->write(0); // Enable SPI
+ _lcd_cd->write(1); // Data mode
+
+ if(page_height + page > LCDPAGES) //stay inside display area
+ page_height = LCDPAGES - page;
+
+ // The string is displayed character after character. If the font has more then one page,
+ // the top page is printed first, then the next page and so on
+ for(y = 0; y < page_height; y++) {
+ txtbuffer = &_lcdbuffer[page*LCDWIDTH + column];
+ column_cnt = 0; // clear column_cnt start point
+ i = 0;
+ while(( i < size) && ((column_cnt + column) < LCDWIDTH)) {
+ if(text[i] < start_code || (uint8_t)text[i] > last_code) //make sure data is valid
+ i++;
+ else {
+ // calculate position of ASCII character in font array
+ // bytes for header + (ASCII - startcode) * bytes per char)
+ pos_array = 8 + (uint8_t)(text[i++] - start_code) * bytes_p_char;
+
+ // get the dot pattern for the part of the char to print
+ pos_array += y*width;
+
+ // stay inside display area
+ if((column_cnt + width + column) > LCDWIDTH)
+ column_cnt = LCDWIDTH-width;
+
+ // copy character data to buffer
+ memcpy (txtbuffer+column_cnt,font_address+pos_array,width);
+ }
+
+ column_cnt += width;
+ }
+ SSH1106::setCursor(column,page); // set start position x and y
+
+ do {
+ _lcd->write(txtbuffer[count]);
+ count++;
+ } while ((count <= column_cnt));
+ }
+
+ _lcd_cs->write(1); // Disable SPI
+
+}
+
+void SSH1106::drawBitmap(const char *data)
+{
+ int cnt = 0;
+ _lcd_cs->write(0);
+ _lcd_cd->write(1);
+ SSH1106::setCursor(0,0);
+ for(int row=0; row<8; row++) {
+ SSH1106::setCursor(0, row);
+ for(int column=0; column<128; column++) {
+ _lcd->write(data[cnt]);
+ cnt++;
+ }
+ }
+}
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