spilcd.h

00001 // AD-12684-SPI control class
00002 // version 0.1
00003 // created by Sim (http://mbed.org/users/Sim/)
00004 //
00005 // About AD-12864-SPI, see http://www.aitendo.co.jp/product/1622 .
00006 
00007 #ifndef __SPILCD_H__
00008 #define __SPILCD_H__
00009 
00010 #include "mbed.h"
00011 
00012 class SPILCD {
00013 private:
00014     DigitalOut cs, rst, a0;
00015     SPI spi;
00016 
00017     // boot up sequence
00018     void init(){
00019         spi.format(8,0); // nazo
00020         spi.frequency(20000000); // modify later
00021         
00022         // reset
00023         wait_ms(10);
00024         rst = 0;
00025         wait_us(1);
00026         rst = 1;
00027         wait_us(1);
00028     
00029         // initialize sequence
00030         cmd(0xa2);    // (11) LCD Bias Set ... 1/9 bias (see 2.4.11)
00031         cmd(0xa0);    // (8)  ADC Select ... normal (see 2.4.8)
00032         cmd(0xc8);    // (15) Common Output Mode Select ... Reverse (see 2.4.15)
00033         cmd(0x24);    // (17) V5 Volatge Regulator Internal Resister Ratio Set (see 2.4.17)
00034         cmd(0x81);    // (18) set electronic volume mode (see 2.4.18)
00035         cmd(0x1e);    //      electronic volume data 00-3f ... control your own value
00036         cmd(0x2f);    // (16) power control set (see 2.4.16)
00037         cmd(0x40);    // (2)  Display Start Line Set ... 0 (see 2.4.2)
00038         cmd(0xe0);    // (6)  Write Mode Set
00039         cmd(0xaf);    // (1)  display on (see 2.4.1)
00040     }
00041 
00042 public:
00043 
00044     // constructor
00045     SPILCD(PinName cs_pin, PinName rst_pin, PinName a0_pin, PinName mosi_pin, PinName miso_pin, PinName sclk_pin)
00046         : cs(cs_pin), rst(rst_pin), a0(a0_pin), spi(mosi_pin, miso_pin, sclk_pin) {
00047         
00048         init();
00049         cls();
00050     }
00051 
00052     // wipe all screen
00053     void cls(void){
00054         int x, y;
00055         for(y = 0; y < 8; y++){
00056             moveto(0, y);
00057             for(x = 0; x < 128; x++) write(0x00);
00058         }
00059         moveto(0, 0);
00060     }
00061 
00062     // move position to (x, 8 * y)
00063     void moveto(int x, int y){
00064         cmd(0xb0 | (y & 0x0f)); // Page Address Set (see 2.4.3)
00065         cmd(0x10 | (x >> 4 & 0x0f)); // Column Address Set (see 2.4.4)
00066         cmd(x & 0x0f);
00067     }
00068 
00069     // write command
00070     void cmd(unsigned char c){
00071         cs = a0 = 0;
00072         spi.write(c);
00073         cs = 1;
00074     }
00075     
00076     // write data
00077     void write(unsigned char c){
00078         cs = 0;
00079         a0 = 1;
00080         spi.write(c);
00081         cs = 1;
00082     }
00083 };
00084 
00085 #endif