Gert van der Knokke
This is a sample program to drive a 128x128 LCD with t6963 controller through SPI by means of an MCP23S17 16-Bit I/O Expander with Serial Interface
Diff: main.cpp
- Revision:
- 3:fc101c00b5be
- Parent:
- 2:9071445a6895
- Child:
- 4:fd7c6559a56d
--- a/main.cpp Mon Dec 06 20:45:00 2010 +0000
+++ b/main.cpp Tue Jun 28 17:02:24 2011 +0000
@@ -1,218 +1,409 @@
-#include "mbed.h"
-#include "mcp_lcd.h"
-
-// for 21 characters on a row (6x8 font)
-// #define LCDFONTSEL 0xFF
-// for 16 characters on a row (8x8 font)
-#define LCDFONTSEL 0xDF
-
-// lcd dimensions in pixels
-#define LCD_XWIDTH 128
-#define LCD_YHEIGHT 128
-
-#if LCDFONTSEL == 0xFF
-// lcd dimensions in characters
-#define LCD_WIDTH 22
-#define LCD_HEIGHT 16
-#else
-#define LCD_WIDTH 16
-#define LCD_HEIGHT 16
-#endif
-
-#define TEXT_STARTADDRESS 0x0000
-#define GRAPHIC_STARTADDRESS 0x1000
-
-DigitalOut myled(LED1);
-SPI spi(p5, p6, p7); // mosi, miso, sclk
-DigitalOut cs(p20);
-
-Serial pc(USBTX, USBRX); // tx, rx
-
-
-// write 8 bits lcd data
-void lcd_data(unsigned char d)
-{
- cs=0;
- spi.write(0x40);
- spi.write(GPIOB); // select GPIOB
- spi.write(d); // set data byte
- cs=1;
-
- cs=0;
- spi.write(0x40);
- spi.write(GPIOA); // select GPIOA
- spi.write(LCDFONTSEL-LCD_CE-LCD_CD);
- cs=1;
-
- cs=0;
- spi.write(0x40);
- spi.write(GPIOA); // select GPIOA
- spi.write(LCDFONTSEL - LCD_WR - LCD_CE - LCD_CD);
- cs=1;
-
- cs=0;
- spi.write(0x40);
- spi.write(GPIOA); // select GPIOA
- spi.write(LCDFONTSEL - LCD_CD);
- cs=1;
-
-}
-
-// write 8 bits lcd command
-void lcd_command(unsigned char c)
-{
- cs=0;
- spi.write(0x40);
- spi.write(GPIOB); // select GPIOB
- spi.write(c); // set data byte
- cs=1;
-
- cs=0;
- spi.write(0x40);
- spi.write(GPIOA); // select GPIOA
- spi.write(LCDFONTSEL-LCD_CE);
- cs=1;
-
- cs=0;
- spi.write(0x40);
- spi.write(GPIOA); // select GPIOA
- spi.write(LCDFONTSEL - LCD_WR - LCD_CE);
- cs=1;
-
- cs=0;
- spi.write(0x40);
- spi.write(GPIOA); // select GPIOA
- spi.write(LCDFONTSEL);
- cs=1;
-}
-
-void lcd_init()
-{
- cs=0;
- spi.write(0x40);
- spi.write(IODIRA); // select IODIRA at start
- spi.write(0x00); // IODIRA all outputs
- spi.write(0x00); // IODIRB all outputs
- cs=1;
- wait(0.1);
-
- cs=0;
- spi.write(0x40);
- spi.write(GPIOA); // select GPIOA at start
- spi.write(LCDFONTSEL-LCD_RST); // activate reset
- spi.write(0x00); // all B outputs 0
- cs=1;
- wait(0.1);
-
- cs=0;
- spi.write(0x40);
- spi.write(GPIOA); // select GPIOA at start
- spi.write(LCDFONTSEL); // deactivate reset
- cs=1;
- wait(0.1);
-
- // set text home address at 0x0000
- lcd_data(TEXT_STARTADDRESS%0x100);
- lcd_data(TEXT_STARTADDRESS/0x100);
- lcd_command(TXHOME);
-
- // set graphic home address at 0x1000
- lcd_data(GRAPHIC_STARTADDRESS%0x100);
- lcd_data(GRAPHIC_STARTADDRESS/0x100);
- lcd_command(GRHOME);
-
- // set text area
- lcd_data(LCD_WIDTH);
- lcd_data(0x00);
- lcd_command(TXAREA);
-
- // set graphic area
- lcd_data(LCD_WIDTH);
- lcd_data(0x00);
- lcd_command(GRAREA);
-
- // mode set (internal character generation mode)
- lcd_command(0x80);
-
- // set offset register
- lcd_data(0x02);
- lcd_data(0x00);
- lcd_command(OFFSET);
-
- // display mode (text on graphics on cursor off)
- lcd_command(0x90+0x08+0x04);
-
-}
-
-// put a text string at position x,y (character row,column)
-void lcd_string(char x,char y,char *s)
-{
- int adr;
- adr=TEXT_STARTADDRESS+x+y*LCD_WIDTH;
- lcd_data(adr%0x100);
- lcd_data(adr/0x100);
- lcd_command(ADPSET);
- lcd_command(AWRON);
-
- while (s[0])
- {
- // convert from ascii to t6963
- lcd_data(s[0]-32);
- s++;
- }
- lcd_command(AWROFF);
-}
-
-// clear lcd display memory (8k)
-void lcd_cls()
-{
- int a;
- lcd_data(0x00);
- lcd_data(0x00);
- lcd_command(ADPSET);
- lcd_command(AWRON);
- for (a=0; a<8192; a++) lcd_data(0);
- lcd_command(AWROFF);
-}
-
-// set or reset a pixel on the display on position x,y with color 0 or 1
-void lcd_plot(char x,char y,char color)
-{
- int adr;
- adr = GRAPHIC_STARTADDRESS + ((LCD_WIDTH) * y) + (x/8); // calculate offset
- lcd_data(adr%0x100); // set low byte
- lcd_data(adr/0x100); // set high byte
- lcd_command(ADPSET); // set address pointer
- if (color) lcd_command(BS + (7-(x%8))); // use bit set mode
- else lcd_command(BR + (7-(x%8))); // use bit reset mode
-}
-
-int main() {
-
- int a;
- pc.printf("SPI test\n");
-
- // set SPI to full speed (10 MHz mode)
- spi.format(8,0);
- spi.frequency(10000000);
-// spi.frequency(10000);
- wait(0.1);
-
- pc.printf("MCP init\n");
- lcd_init();
- lcd_cls();
-
- // write some text
- lcd_string(0,0,"Hello World!");
- lcd_string(0,2,"0123456789");
- lcd_string(0,15,"abcdefghijklmnopqrstuvwxyz");
-
- for (a=0; a<128; a++) lcd_plot(a,a/2+48,1);
-
- while(1) {
- myled = 1;
- wait(0.2);
- myled = 0;
- wait(0.2);
- }
-}
+#include "mbed.h"
+#include "mcp_lcd.h"
+
+// for 21 characters on a row (6x8 font)
+#define LCDFONTSEL 0xFF
+// for 16 characters on a row (8x8 font)
+// #define LCDFONTSEL 0xDF
+
+// lcd dimensions in pixels
+#define LCD_XWIDTH 128
+#define LCD_YHEIGHT 128
+
+#if LCDFONTSEL == 0xFF
+// lcd dimensions in characters
+#define LCD_WIDTH 22
+#define LCD_HEIGHT 16
+#define PIXELWIDTH 6
+#else
+#define LCD_WIDTH 16
+#define LCD_HEIGHT 16
+#define PIXELWIDTH 8
+#endif
+
+#define TEXT_STARTADDRESS 0x0000
+#define GRAPHIC_STARTADDRESS 0x1000
+
+
+#define CENTERX 64
+#define CENTERY 64
+#define INNER_RADIUS 45
+#define OUTER_RADIUS 50
+#define CENTER_CIRCLE 5
+
+DigitalOut myled(LED1);
+SPI spi(p5, p6, p7); // mosi, miso, sclk
+DigitalOut cs(p20);
+
+Serial pc(USBTX, USBRX); // tx, rx
+
+
+// write 8 bits lcd data
+void lcd_data(unsigned char d)
+{
+ cs=0;
+ spi.write(0x40);
+ spi.write(GPIOB); // select GPIOB
+ spi.write(d); // set data byte
+ cs=1;
+
+ cs=0;
+ spi.write(0x40);
+ spi.write(GPIOA); // select GPIOA
+ spi.write(LCDFONTSEL-LCD_CE-LCD_CD);
+ cs=1;
+
+ cs=0;
+ spi.write(0x40);
+ spi.write(GPIOA); // select GPIOA
+ spi.write(LCDFONTSEL - LCD_WR - LCD_CE - LCD_CD);
+ cs=1;
+
+ cs=0;
+ spi.write(0x40);
+ spi.write(GPIOA); // select GPIOA
+ spi.write(LCDFONTSEL - LCD_CD);
+ cs=1;
+
+}
+
+// write 8 bits lcd command
+void lcd_command(unsigned char c)
+{
+ cs=0;
+ spi.write(0x40);
+ spi.write(GPIOB); // select GPIOB
+ spi.write(c); // set data byte
+ cs=1;
+
+ cs=0;
+ spi.write(0x40);
+ spi.write(GPIOA); // select GPIOA
+ spi.write(LCDFONTSEL-LCD_CE);
+ cs=1;
+
+ cs=0;
+ spi.write(0x40);
+ spi.write(GPIOA); // select GPIOA
+ spi.write(LCDFONTSEL - LCD_WR - LCD_CE);
+ cs=1;
+
+ cs=0;
+ spi.write(0x40);
+ spi.write(GPIOA); // select GPIOA
+ spi.write(LCDFONTSEL);
+ cs=1;
+}
+
+void lcd_init()
+{
+ cs=0;
+ spi.write(0x40);
+ spi.write(IODIRA); // select IODIRA at start
+ spi.write(0x00); // IODIRA all outputs
+ spi.write(0x00); // IODIRB all outputs
+ cs=1;
+ wait(0.1);
+
+ cs=0;
+ spi.write(0x40);
+ spi.write(GPIOA); // select GPIOA at start
+ spi.write(LCDFONTSEL-LCD_RST); // activate reset
+ spi.write(0x00); // all B outputs 0
+ cs=1;
+ wait(0.1);
+
+ cs=0;
+ spi.write(0x40);
+ spi.write(GPIOA); // select GPIOA at start
+ spi.write(LCDFONTSEL); // deactivate reset
+ cs=1;
+ wait(0.1);
+
+ // set text home address at 0x0000
+ lcd_data(TEXT_STARTADDRESS%0x100);
+ lcd_data(TEXT_STARTADDRESS/0x100);
+ lcd_command(TXHOME);
+
+ // set graphic home address at 0x1000
+ lcd_data(GRAPHIC_STARTADDRESS%0x100);
+ lcd_data(GRAPHIC_STARTADDRESS/0x100);
+ lcd_command(GRHOME);
+
+ // set text area
+ lcd_data(LCD_WIDTH);
+ lcd_data(0x00);
+ lcd_command(TXAREA);
+
+ // set graphic area
+ lcd_data(LCD_WIDTH);
+ lcd_data(0x00);
+ lcd_command(GRAREA);
+
+ // mode set (internal character generation mode)
+ lcd_command(0x80);
+
+ // set offset register
+ lcd_data(0x02);
+ lcd_data(0x00);
+ lcd_command(OFFSET);
+
+ // display mode (text on graphics on cursor off)
+ lcd_command(0x90+0x08+0x04);
+
+}
+
+// put a text string at position x,y (character row,column)
+void lcd_string(char x,char y,char *s)
+{
+ int adr;
+ adr=TEXT_STARTADDRESS+x+y*LCD_WIDTH;
+ lcd_data(adr%0x100);
+ lcd_data(adr/0x100);
+ lcd_command(ADPSET);
+ lcd_command(AWRON);
+
+ while (s[0])
+ {
+ // convert from ascii to t6963
+ lcd_data(s[0]-32);
+ s++;
+ }
+ lcd_command(AWROFF);
+}
+
+// clear lcd display memory (8k)
+void lcd_cls()
+{
+ int a;
+ lcd_data(0x00);
+ lcd_data(0x00);
+ lcd_command(ADPSET);
+ lcd_command(AWRON);
+ for (a=0; a<8192; a++) lcd_data(0);
+ lcd_command(AWROFF);
+}
+
+// set or reset a pixel on the display on position x,y with color 0 or 1
+void lcd_plot(char x,char y,char color)
+{
+ int adr;
+ adr = GRAPHIC_STARTADDRESS + ((LCD_WIDTH) * y) + (x/PIXELWIDTH); // calculate offset
+ lcd_data(adr%0x100); // set low byte
+ lcd_data(adr/0x100); // set high byte
+ lcd_command(ADPSET); // set address pointer
+ if (color) lcd_command(BS + ((PIXELWIDTH-1)-(x%PIXELWIDTH))); // use bit set mode
+ else lcd_command(BR + ((PIXELWIDTH-1)-(x%PIXELWIDTH))); // use bit reset mode
+}
+
+// Bresenham line routine
+void lcd_line(int x0, int y0, int x1, int y1,char color)
+{
+ char steep=1;
+ int i,dx,dy,e;
+ signed char sx,sy;
+
+ dx = abs(x1-x0);
+ sx = ((x1 - x0) >0) ? 1 : -1;
+ dy=abs(y1-y0);
+ sy = ((y1 - y0) >0) ? 1 : -1;
+
+ if (dy > dx)
+ {
+ steep=0;
+ // swap X0 and Y0
+ x0=x0 ^ y0;
+ y0=x0 ^ y0;
+ x0=x0 ^ y0;
+
+ // swap DX and DY
+ dx=dx ^ dy;
+ dy=dx ^ dy;
+ dx=dx ^ dy;
+
+ // swap SX and SY
+ sx=sx ^ sy;
+ sy=sx ^ sy;
+ sx=sx ^ sy;
+ }
+
+ e = (dy << 1) - dx;
+
+ for (i=0; i<=dx; i++)
+ {
+ if (steep)
+ {
+ lcd_plot(x0,y0,color);
+ }
+ else
+ {
+ lcd_plot(y0,x0,color);
+ }
+ while (e >= 0)
+ {
+ y0 += sy;
+ e -= (dx << 1);
+ }
+ x0 += sx;
+ e += (dy << 1);
+ }
+ }
+
+// Bresenham circle routine
+void lcd_circle(int x0,int y0, int radius, char color)
+{
+
+ int f = 1 - radius;
+ int dx = 1;
+ int dy = -2 * radius;
+ int x = 0;
+ int y = radius;
+
+ lcd_plot(x0, y0 + radius,color);
+ lcd_plot(x0, y0 - radius,color);
+ lcd_plot(x0 + radius, y0,color);
+ lcd_plot(x0 - radius, y0,color);
+
+ while(x < y)
+ {
+ if(f >= 0)
+ {
+ y--;
+ dy += 2;
+ f += dy;
+ }
+ x++;
+ dx += 2;
+ f += dx;
+ lcd_plot(x0 + x, y0 + y,color);
+ lcd_plot(x0 - x, y0 + y,color);
+ lcd_plot(x0 + x, y0 - y,color);
+ lcd_plot(x0 - x, y0 - y,color);
+ lcd_plot(x0 + y, y0 + x,color);
+ lcd_plot(x0 - y, y0 + x,color);
+ lcd_plot(x0 + y, y0 - x,color);
+ lcd_plot(x0 - y, y0 - x,color);
+ }
+}
+
+int main() {
+
+
+ float a,b,f;
+ float pi=3.14159265;
+ float h_pi=pi/6;
+ float m_pi=pi/30;
+
+ char buf[40];
+ time_t seconds;
+ int sec,min,hour;
+ int s_sx,s_sy,s_ex,s_ey;
+ int m_sx,m_sy,m_ex,m_ey;
+ int h_sx,h_sy,h_ex,h_ey;
+
+ // setup time structure
+ struct tm t;
+ t.tm_sec = 00; // 0-59
+ t.tm_min = 30; // 0-59
+ t.tm_hour = 21; // 0-23
+ t.tm_mday = 14; // 1-31
+ t.tm_mon = 11; // 0-11
+ t.tm_year = 110; // year since 1900
+ seconds = mktime(&t);
+ // set_time(seconds);
+
+
+ pc.printf("SPI test\n");
+
+ // set SPI to full speed (10 MHz mode)
+ spi.format(8,0);
+ spi.frequency(10000000);
+// spi.frequency(10000);
+ wait(0.1);
+
+ pc.printf("MCP init\n");
+ lcd_init();
+ lcd_cls();
+
+ // write some text 345678901234567890
+ lcd_string(0,0,"* Hello mbed World! *");
+ // lcd_string(0,15,"abcdefghijklmnopqrstuvwxyz");
+
+
+ // draw outer circle of analog clock
+ lcd_circle(CENTERX,CENTERY,OUTER_RADIUS+1,1);
+
+ // draw hour markings
+ for (min=0; min<59; min+=5)
+ {
+ b=min*m_pi;
+ m_sx=sin(b)*INNER_RADIUS+CENTERX;
+ m_sy=-cos(b)*INNER_RADIUS+CENTERY;
+ m_ex=sin(b)*OUTER_RADIUS+CENTERX;
+ m_ey=-cos(b)*OUTER_RADIUS+CENTERY;
+ lcd_line(m_sx,m_sy,m_ex,m_ey,1);
+ }
+
+
+ for(;;)
+ {
+ seconds = time(NULL);
+
+ // 13:24:00 dd/mm/yyyy
+ strftime(buf,40, "%H:%M:%S %d/%m/%Y", localtime(&seconds));
+ lcd_string(0,15,buf);
+
+ strftime(buf,40, "%I %M %S", localtime(&seconds));
+ sscanf(buf,"%d %d %d",&hour,&min,&sec);
+
+ b=sec*m_pi;
+ s_sx=CENTERX;
+ s_sy=CENTERY;
+ s_ex=sin(b)*(INNER_RADIUS-3)+CENTERX;
+ s_ey=-cos(b)*(INNER_RADIUS-3)+CENTERY;
+
+
+ b=min*m_pi;
+ m_sx=sin(b)*(CENTER_CIRCLE)+CENTERX;
+ m_sy=-cos(b)*(CENTER_CIRCLE)+CENTERY;
+ m_ex=sin(b)*(INNER_RADIUS-10)+CENTERX;
+ m_ey=-cos(b)*(INNER_RADIUS-10)+CENTERY;
+
+ // advancing hour hand
+ if (hour<12)
+ {
+ // draw hour hand with an offset
+ // calculated by dividing minutes by 12
+ b=(hour*5+min/12)*m_pi;
+ }
+ else
+ {
+ // hour would be 0 offset at 12 o'clock
+ // so we can leave it out of the equation...
+ b=(min/12)*m_pi;
+ }
+ h_sx=sin(b)*(CENTER_CIRCLE)+CENTERX;
+ h_sy=-cos(b)*(CENTER_CIRCLE)+CENTERY;
+ h_ex=sin(b)*(INNER_RADIUS-20)+CENTERX;
+ h_ey=-cos(b)*(INNER_RADIUS-20)+CENTERY;
+
+ // draw 'new' hands
+ lcd_line(s_sx,s_sy,s_ex,s_ey,1);
+ lcd_line(m_sx,m_sy,m_ex,m_ey,1);
+ lcd_line(h_sx,h_sy,h_ex,h_ey,1);
+
+ lcd_circle(CENTERX,CENTERY,CENTER_CIRCLE,1);
+ lcd_circle(CENTERX,CENTERY,1,1);
+
+ myled = !myled;
+
+ // now wait until the seconds change
+ while (seconds==time(NULL)) wait(0.1);
+
+ // erase 'old' hands
+ lcd_line(s_sx,s_sy,s_ex,s_ey,0);
+ lcd_line(m_sx,m_sy,m_ex,m_ey,0);
+ lcd_line(h_sx,h_sy,h_ex,h_ey,0);
+
+ }
+}