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
Revision 0:bf72877f77ab, committed 2010-12-05
- Comitter:
- gertk
- Date:
- Sun Dec 05 14:31:49 2010 +0000
- Child:
- 1:e98e29ea2d03
- Commit message:
- 0.0001
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/MCP23S17.h Sun Dec 05 14:31:49 2010 +0000 @@ -0,0 +1,54 @@ +/* MCP23S17 - drive the Microchip MCP23S17 16-bit Port Extender using SPI +* Copyright (c) 2010 Romilly Cocking +* Released under the MIT License: http://mbed.org/license/mit +* +* version 0.4 +*/ +#include "mbed.h" + + +#define INTERRUPT_POLARITY_BIT 0x02 +#define INTERRUPT_MIRROR_BIT 0x40 + +// all register addresses assume IOCON.BANK = 0 (POR default) + +#define IODIRA 0x00 +#define IODIRB 0x01 +#define IPOLA 0x02 +#define IPOLB 0x03 +#define GPINTENA 0x04 +#define GPINTENB 0x05 +#define DEFVALA 0x06 +#define DEFVALB 0x07 +#define INTCONA 0x08 +#define INTCONB 0x09 +#define IOCONA 0x0A +#define IOCONB 0x0B +#define GPPUA 0x0C +#define GPPUB 0x0D +#define INTFA 0x0E +#define INTFB 0x0F +#define INTCAPA 0x10 +#define INTCAPB 0x11 +#define GPIOA 0x12 +#define GPIOB 0x13 +#define OLATA 0x14 +#define OLATB 0x15 + +#define LCD_HALT 0x80 +#define LCD_FS 0x20 +#define LCD_RST 0x10 +#define LCD_CD 0x08 +#define LCD_CE 0x04 +#define LCD_RD 0x02 +#define LCD_WR 0x01 + +// T6963C OPCODES +#define TXHOME 0x40 // SET TXT HM ADD +#define TXAREA 0x41 // SET TXT AREA +#define GRHOME 0x42 // SET GRAPHIC HOME ADDRESS +#define GRAREA 0x43 // SET GRAPHIC AREA +#define OFFSET 0x22 // SET OFFSET ADDRESS +#define ADPSET 0x24 // SET ADDRESS POINTER +#define AWRON 0xB0 // SET AUTO WRITE MODE +#define AWROFF 0xB2 // RESET AUTO WRITE MODE
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Sun Dec 05 14:31:49 2010 +0000
@@ -0,0 +1,177 @@
+#include "mbed.h"
+#include "MCP23S17.h"
+
+#define LCDFONTSEL 0xFF
+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);
+
+
+}
+
+void lcd_string(char *s)
+{
+ while (s[0])
+ {
+ lcd_data(s[0]-32);
+ s++;
+ }
+}
+
+
+
+int main() {
+
+ unsigned char a;
+ pc.printf("SPI test\n");
+
+ spi.format(8,0);
+ spi.frequency(1000000);
+// spi.frequency(10000);
+ wait(0.1);
+
+ pc.printf("MCP init\n");
+ lcd_init();
+
+ // set text home address at 0x0000
+ lcd_data(0x00);
+ lcd_data(0x00);
+ lcd_command(TXHOME);
+
+ // set graphic home address at 0x0200
+ lcd_data(0x00);
+ lcd_data(0x20);
+ lcd_command(GRHOME);
+
+ // set text area 20 columns
+ lcd_data(0x14);
+ lcd_data(0x00);
+ lcd_command(TXAREA);
+
+ // set graphic area 20 columns
+ lcd_data(0x14);
+ 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(0x94);
+
+ // write text blank code
+ lcd_data(0x00);
+ lcd_data(0x00);
+ lcd_command(ADPSET);
+ lcd_command(AWRON);
+ for (a=0; a<160; a++) lcd_data(0);
+ lcd_command(AWROFF);
+
+ // write some text
+ lcd_data(0x40);
+ lcd_data(0x00);
+ lcd_command(ADPSET);
+ lcd_command(AWRON);
+ lcd_string("Hello World!");
+ lcd_string("0123456789");
+ lcd_string("abcdefghijklmnopqrstuvwxyz");
+ lcd_command(AWROFF);
+ lcd_data(0x80);
+
+ while(1) {
+ myled = 1;
+ wait(0.2);
+ myled = 0;
+ wait(0.2);
+ }
+}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Sun Dec 05 14:31:49 2010 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/e2ac27c8e93e