main.cpp

00001 // AD-12864-SPI test program
00002 // About AD-12864-SPI, see http://www.aitendo.co.jp/product/1622.
00003 
00004 // Pin allocation
00005 // 1 p21 #CS1 with 10k ohm pull-up
00006 // 2 p22 #RESET with 10k ohm pull-up
00007 // 3 p23 A0 ... 0:command 1:data
00008 // 4 p13 SCK
00009 // 5 p11 MOSI
00010 // 6     Vdd
00011 // 7     Vss
00012 // 8 NC  LED_A 
00013 
00014 #include "mbed.h"
00015 #include "font8.h"
00016 
00017 DigitalOut cs(p21);
00018 DigitalOut rst(p22);
00019 DigitalOut a0(p23);
00020 SPI spi(p11, p12, p13); // mosi, miso, sclk
00021 
00022 void regwrite(unsigned char c){
00023     cs = a0 = 0;
00024     spi.write(c);
00025     cs = 1;
00026 }
00027 
00028 void datawrite(unsigned char c){
00029     cs = 0;
00030     a0 = 1;
00031     spi.write(c);
00032     cs = 1;
00033 }
00034 
00035 // set position (x, 8*y)
00036 void locate(int x, int y){
00037     regwrite(0xb0 | (y & 0x0f)); // Page Address Set (see 2.4.3)
00038     regwrite(0x10 | (x >> 4 & 0x0f)); // Column Address Set (see 2.4.4)
00039     regwrite(x & 0x0f);
00040 }
00041 
00042 void cls(void){
00043     int x, y;
00044     for(y = 0; y < 8; y++){
00045         locate(0, y);
00046         for(x = 0; x < 128; x++) datawrite(0x00);
00047     }
00048 }
00049 
00050 void plot(int x, int y){
00051     locate(x, y >> 3);
00052     datawrite(1 << (y & 7));
00053 }
00054 
00055 void init(){
00056     spi.format(8,0); // nazo
00057     spi.frequency(10000000); // modify later
00058     
00059     // reset
00060     wait_ms(200);
00061     rst = 0;
00062     wait_ms(200);
00063     rst = 1;
00064 
00065     // initialize sequence
00066     regwrite(0xaf);    // display on (see 2.4.1)
00067     regwrite(0x2f);    // power control set (see 2.4.16)
00068     regwrite(0x81);    // set electronic volume mode (see 2.4.18)
00069 //    regwrite(0x1f);    // electronic volume data 00-3f
00070     regwrite(0x00);    // electronic volume data 00-3f
00071     regwrite(0x27);    // V5 Volatge Regulator Internal Resister Ratio Set (see 2.4.17)
00072     regwrite(0xa2);    // LCD Bias Set ... 1/9 bias (see 2.4.11)
00073     regwrite(0xc8);    // Common Output Mode Select ... Reverse (see 2.4.15)
00074     regwrite(0xa0);    // ADC Select ... Normal (see 2.4.8)
00075     regwrite(0xa4);    // Display All Points ON/OFF ... normal (see 2.4.10)
00076     regwrite(0xa6);    // Display Normal/Reverse ... normal (see 2.4.9)
00077     regwrite(0xac);    // Static Indicator ... off (see 2.4.19)
00078     regwrite(0x00);    // off
00079     regwrite(0x40);    // Display Strat Line Set ... 0 (see 2.4.2)
00080     regwrite(0xe0);    // Write Mode Set
00081 }
00082 
00083 void drawchar(unsigned char c){
00084     const unsigned char *p = &font8[c << 3];
00085     datawrite(p[0]);
00086     datawrite(p[1]);
00087     datawrite(p[2]);
00088     datawrite(p[3]);
00089     datawrite(p[4]);
00090     datawrite(p[5]);
00091     datawrite(p[6]);
00092     datawrite(p[7]);
00093 }
00094 
00095 void drawtext(const char *s){
00096     unsigned char c;
00097     while((c = *s++) != '\0') drawchar(c);
00098 }
00099 
00100 int main() {
00101     int x, y, c;
00102     char buf[16];
00103     
00104     init();
00105     cls();
00106 
00107     locate(0, 0);
00108     sprintf(buf, "%08x", 0xdeadbeef);
00109     drawtext(buf);
00110     wait_ms(2000);
00111 
00112     c = 0;
00113     while(1) {
00114         for(y = 0; y < 8; y++){
00115             locate(0, y);
00116             for(x = 0; x < 16; x++) drawchar(c++);
00117         }
00118         wait_ms(800);
00119     }
00120 }