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 
00016 DigitalOut cs(p21);
00017 DigitalOut rst(p22);
00018 DigitalOut a0(p23);
00019 SPI spi(p11, p12, p13); // mosi, miso, sclk
00020 
00021 void regwrite(unsigned char c){
00022     cs = a0 = 0;
00023     spi.write(c);
00024     cs = 1;
00025 }
00026 
00027 void datawrite(unsigned char c){
00028     cs = 0;
00029     a0 = 1;
00030     spi.write(c);
00031     cs = 1;
00032 }
00033 
00034 // set position (x, 8*y)
00035 void locate(int x, int y){
00036     regwrite(0xb0 | (y & 0x0f)); // Page Address Set (see 2.4.3)
00037     regwrite(0x10 | (x >> 4 & 0x0f)); // Column Address Set (see 2.4.4)
00038     regwrite(x & 0x0f);
00039 }
00040 
00041 void cls(void){
00042     int x, y;
00043     for(y = 0; y < 8; y++){
00044         locate(0, y);
00045         for(x = 0; x < 128; x++) datawrite(0x00);
00046     }
00047 }
00048 
00049 void plot(int x, int y){
00050     locate(x, y >> 3);
00051     datawrite(1 << (y & 7));
00052 }
00053 
00054 void init(){
00055     spi.format(8,0); // nazo
00056     spi.frequency(20000000); // modify later
00057     
00058     // reset
00059     wait_ms(200);
00060     rst = 0;
00061     wait_ms(200);
00062     rst = 1;
00063 
00064     // initialize sequence
00065     regwrite(0xaf);    // display on (see 2.4.1)
00066     regwrite(0x2f);    // power control set (see 2.4.16)
00067     regwrite(0x81);    // set electronic volume mode (see 2.4.18)
00068 //    regwrite(0x1f);    // electronic volume data 00-3f
00069     regwrite(0x00);    // electronic volume data 00-3f
00070     regwrite(0x27);    // V5 Volatge Regulator Internal Resister Ratio Set (see 2.4.17)
00071     regwrite(0xa2);    // LCD Bias Set ... 1/9 bias (see 2.4.11)
00072     regwrite(0xc8);    // Common Output Mode Select ... Reverse (see 2.4.15)
00073     regwrite(0xa0);    // ADC Select ... Normal (see 2.4.8)
00074     regwrite(0xa4);    // Display All Points ON/OFF ... normal (see 2.4.10)
00075     regwrite(0xa6);    // Display Normal/Reverse ... normal (see 2.4.9)
00076     regwrite(0xac);    // Static Indicator ... off (see 2.4.19)
00077     regwrite(0x00);    // off
00078     regwrite(0x40);    // Display Strat Line Set ... 0 (see 2.4.2)
00079     regwrite(0xe0);    // Write Mode Set
00080 }
00081 
00082 DigitalOut myled(LED1);
00083 
00084 int main() {
00085     int i;
00086 
00087     init();
00088 
00089     cls();
00090     locate(0, 0);
00091     for(i = 0; i < 256; i++) datawrite(i);
00092 
00093     for(i = 0; i < 64; i++){
00094         plot(64 + i, 0);
00095         plot(64 + i, 63);
00096     }
00097 
00098     for(i = 0; i < 8; i++){
00099         locate(64, i);
00100         datawrite(0xff);
00101         locate(127,i);
00102         datawrite(0xff);
00103     }
00104 
00105     for(i = 0; i < 64; i++) plot(i, i);
00106 
00107     while(1) {
00108         myled = 1;
00109         wait_ms(200);
00110         myled = 0;
00111         wait_ms(200);
00112     }
00113 }