steeven lee
A lib to handle a E-Paper display from Jiaxian Displays. The lib can handle graphic and text drawing and is using external fonts. SPI interface.
This E-ink display can be found from here, Factory datasheet, Controller: SSD1606
Revision 0:e7a39129f419, committed 2015-04-15
- Comitter:
- steeven
- Date:
- Wed Apr 15 11:16:20 2015 +0000
- Commit message:
- GDE021A1 initial
Changed in this revision
| EpdGDE021A1.cpp | Show annotated file Show diff for this revision Revisions of this file |
| EpdGDE021A1.h | Show annotated file Show diff for this revision Revisions of this file |
diff -r 000000000000 -r e7a39129f419 EpdGDE021A1.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/EpdGDE021A1.cpp Wed Apr 15 11:16:20 2015 +0000
@@ -0,0 +1,170 @@
+#include "EpdGDE021A1.h"
+#include "GraphicUtil/Graphic.h"
+
+using namespace mbed;
+
+//const unsigned char init_data[] = { 0x00, 0x00, 0x00, 0x55, 0x00, 0x00, 0x55,
+// 0x55, 0x00, 0x55, 0x55, 0x55, 0xAA, 0xAA, 0xAA, 0xAA, 0x15, 0x15, 0x15,
+// 0x15, 0x05, 0x05, 0x05, 0x05, 0x01, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00,
+// 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+// 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+// 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+// 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+// 0x00, 0x44, 0xF7, 0x44, 0x17, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; //waveform
+const unsigned char init_data[] = { 0x00, 0x00, 0x00, 0x55, 0x00, 0x00, 0x55,
+ 0x55, 0x00, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0xAA, 0x55,
+ 0x55, 0xAA, 0xAA, 0xAA, 0xAA, 0x05, 0x05, 0x05, 0x05, 0x15, 0x15, 0x15,
+ 0x15, 0x01, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x34, 0x32, 0xF1, 0x74, 0x14, 0x00, 0x00, 0x00, 0x00, 0x00, };
+
+EpdGDE021A1::EpdGDE021A1(PinName mosi, PinName sclk, PinName cs, PinName dc,
+ PinName reset) :
+ Graphic(_buf,
+ GED021A1_WIDH, GED021A1_HIGHT, GED021A1_BITS), //graphic
+ _spi(mosi, NC, sclk), // spi
+ _spi_ncs(cs), //cs
+ _spi_ndc(dc), //d/c
+ _reset(reset) // reset
+{
+ _reset = 1;
+ _spi_ncs = 1;
+ if (dc == NC) {
+// _spi.format(9);
+ _spi3w = 1;
+ } else
+ _spi3w = 0;
+// _spi.frequency(100000); //default 1M
+
+ memset(_buf, 0xff, GED021A1_BUF_SIZE);
+}
+
+void EpdGDE021A1::reset() {
+ _reset = 0;
+ wait_ms(1); //1ms
+ _reset = 1;
+ wait_ms(1); //1ms
+}
+
+void EpdGDE021A1::spi_write(int cmd, unsigned char val) {
+ int v;
+// _spi_ncs = 0;
+// DELAY_100nS(1);
+// wait_ms(3);
+// wait_us(100);
+
+ _spi_ncs = 0;
+
+ if (_spi3w == 1) { //SPI 3-wire mode, bit-9 = !cmd
+ v = ((!cmd) << 7) | (val >> 1);
+ _spi.write(v);
+ _spi.write(val << 7);
+// v = ((!cmd) << 8) | (val);
+// _spi.write(v);
+ } else {
+ _spi_ndc = !cmd;
+ _spi.write(val);
+ }
+
+ //DELAY_100nS(1);
+// wait_ms(3);
+// wait_us(100);
+ _spi_ncs = 1;
+ wait_us(1);
+// wait_us(100);
+// wait_ms(3);
+}
+
+void EpdGDE021A1::spi_cmd(unsigned char cmd) {
+ spi_write(1, cmd);
+}
+void EpdGDE021A1::spi_data(unsigned char val) {
+ spi_write(0, val);
+}
+
+void EpdGDE021A1::write_lut() {
+ unsigned char i;
+ spi_cmd(0x32); //write LUT register
+ for (i = 0; i < 90; i++)
+ spi_data(init_data[i]); //write LUT register
+}
+void EpdGDE021A1::init() {
+ //initial code
+ spi_cmd(0x10); //set no deep sleep mode
+ spi_data(0x00);
+
+ /* controller layout (x:y):
+ * 0:172 0:0
+ * 72:172 72:0
+ * To refresh EPD from left to right, x increase then y decrease
+ */
+ spi_cmd(0x11); //data enter mode
+ spi_data(0x01); //x inc then y dec
+
+ spi_cmd(0x44); //set window x
+ spi_data(0x00); //start at 00h;
+ spi_data(0x11); //end at 11h(17)->72
+
+ spi_cmd(0x45); //set window y
+ spi_data(0xAB); //start at ABh(171)->172
+ spi_data(0x00); //end at 00h
+
+ spi_cmd(0x4E); //set RAM x address count to 0;
+ spi_data(0x00);
+ spi_cmd(0x4F); //set RAM y address count to 0;
+ spi_data(0xAB);
+
+ spi_cmd(0x21); //bypass RAM data
+ spi_data(0x81); //only content
+
+ spi_cmd(0xF0); //booster feedback used
+ spi_data(0x1F);
+ spi_cmd(0x2C); //vcom voltage
+ spi_data(0xA0);
+ spi_cmd(0x3C); //board voltage
+ spi_data(0x63);
+ spi_cmd(0x22); //display update sequence option ,in page 33
+ spi_data(0xc4); //0xc4 //enable sequence: clk -> CP -> LUT -> pattern display
+ write_lut();
+}
+
+void EpdGDE021A1::wait_busy() {
+// while (1) {
+// for (unsigned int i = 5; i > 0; i--)
+// ;
+// if (digitalRead(BUSY_GDE021A1) == 0)
+// break;
+// }
+ wait(2);
+}
+
+void EpdGDE021A1::sleep() {
+ spi_cmd(0x22); //display updata sequence option
+ spi_data(0x03);
+ spi_cmd(0x20);
+}
+
+void EpdGDE021A1::draw(unsigned char *data) {
+ int i;
+ spi_cmd(0x24);
+ for (i = 0; i < GED021A1_BUF_SIZE; i++) {
+ spi_data(data[i]);
+ }
+ spi_cmd(0x20);
+ wait_ms(1);
+ wait_busy();
+ wait(1.5);
+ sleep();
+}
+
+void EpdGDE021A1::setup() {
+ reset();
+ init();
+}
+
+void EpdGDE021A1::update() {
+ setup();
+ draw(_buf);
+}
diff -r 000000000000 -r e7a39129f419 EpdGDE021A1.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/EpdGDE021A1.h Wed Apr 15 11:16:20 2015 +0000
@@ -0,0 +1,45 @@
+#ifndef EPDGDE021A1_H_
+#define EPDGDE021A1_H_
+
+#include "mbed.h"
+#include "Graphic.h"
+
+#define GED021A1_BUF_SIZE 3096
+#define GED021A1_WIDH 172
+#define GED021A1_HIGHT 72
+#define GED021A1_BITS 2
+
+class EpdGDE021A1: public Graphic {
+
+public:
+ EpdGDE021A1(PinName mosi = p5, PinName sclk = p7, PinName cs = p8,
+ PinName dc = p9, PinName reset = p10);
+
+ void setup();
+ void update();
+ void sleep();
+
+public:
+ virtual ~EpdGDE021A1() {
+ }
+
+protected:
+ void draw(unsigned char *data);
+ void reset();
+ void wait_busy();
+ void write_lut();
+ void init();
+ void spi_write(int cmd, unsigned char val);
+ void spi_cmd(unsigned char cmd);
+ void spi_data(unsigned char val);
+ SPI _spi;
+ DigitalOut _spi_ncs;
+ DigitalOut _spi_ndc;
+ DigitalOut _reset;
+ int _spi3w;
+
+public:
+ unsigned char _buf[GED021A1_BUF_SIZE];
+};
+
+#endif /* EPDGDE021A1_H_ */