仅仅使用pc14,pc15两个GPIO,外加电源线两条。(未测试,供参考)。
最近几天有空了测试
这种液晶是最常见的 12832,12864控制器，他们都是通用的。
硬件：sck - pc14 sid -> pc15
psb - GND , CS - VCC
/*-------------------------------------------------------------------------------------
date:20071109
author: wkj
ver 1.0
stc7920 lcd driver
---------------------------------------------------------------------------------------*/
#include <sys/types.h>
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <signal.h>
#include <time.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/file.h>
#include "gpio.h"
#include "main.h"
#include "io.h"
#include <stdarg.h>
#include <memory.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/mman.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <signal.h>
//当前像素位置 和当前显示页
static unsigned char PixX,page;
#define DEBUGMSG(x, y, args...) printf(y, ##args)
void *map_base; //phy 0xffff f000 virtual address
//clock input 同步时钟输入端
#define E_CLK_0 *((unsigned long*)(map_base + ((PIOC_OFFSET + AT91_PIO_CODR)))) = 0x1<<14; //PC14 as 0; A0=0
#define E_CLK_1 *((unsigned long*)(map_base + ((PIOC_OFFSET + AT91_PIO_SODR)))) = 0x1<<14; //PC14 as 1; A0=1
#define RW_SID_0 *((unsigned long*)(map_base + ((PIOC_OFFSET + AT91_PIO_CODR)))) = 0x1<<15; //PC15 as 0 ; RW=0
#define RW_SID_1 *((unsigned long*)(map_base + ((PIOC_OFFSET + AT91_PIO_SODR)))) = 0x1<<15; //PC15 as 1 ; RW=1
void delay(unsigned long int n)
{
unsigned long int i;
for(i=0; i<n*10; i++) {;}
}
//串行发送一字节数据
void SendByte(unsigned char dat)
{
unsigned char i;
for(i=0;i<8;i++)
{
E_CLK_0;
if(dat&0x80)
{
RW_SID_1;
}
else
{
RW_SID_0;
}
E_CLK_1;
dat=dat<<1;
}
}
//写控制命令
void SendCMD(unsigned char dat)
{
SendByte(0xF8);//11111,00,0 RW=0,RS=0 同步标志
SendByte(dat&0xF0);//高四位
SendByte((dat&0x0F)<<4);//低四位
}
//写显示数据或单字节字符
void SendDat(unsigned char dat)
{
SendByte(0xFA);//11111,01,0 RW=0,RS=1
SendByte(dat&0xF0);//高四位
SendByte((dat&0x0F)<<4);//低四位
}
/* 写汉字到LCD 指定的位置
x_add显示RAM的地址
dat1/dat2显示汉字编码
*/
void display(unsigned char x_add,unsigned char dat1,unsigned char dat2)
{
SendCMD(x_add);//1xxx,xxxx 设定DDRAM 7位地址xxx,xxxx到地址计数器AC
SendDat(dat1);
SendDat(dat2);
}
//初始化 LCM
void initlcm(void)
{
delay(100);
SendCMD(0x30);//功能设置，一次送8位数据，基本指令集
SendCMD(0x0C);//0000,1100 整体显示，游标off，游标位置off
SendCMD(0x01);//0000,0001 清DDRAM
SendCMD(0x02);//0000,0010 DDRAM地址归位
SendCMD(0x80);//1000,0000 设定DDRAM 7位地址000，0000到地址计数器AC
}
//////////////////////////////////////////
unsigned char SetLcdDisplayCharPos(unsigned char row, unsigned char col)
{
if ((row < 2) && (col < 16))//英文字符为2行16列
{
SendCMD(0x80 + row * 16 + col);//发送设定DDRAM地址row * 16 + col命令
return 1;
}
else
return 0;
}
void LcdDisplayChar(unsigned char row, unsigned char col, unsigned char * string)
{
if (SetLcdDisplayCharPos(row, col))
{
SendDat(*string);
}
}
unsigned char SetLcdDisplayChinsePos(unsigned char row, unsigned char col)
{
if ((row < 2) && (col < 8))//汉字字符为2行8列(偶数对齐)
{
SendCMD(0x80 + row * 16 + col * 2);//发送设定DDRAM地址row * 16 + col * 2命令
return 1;
}
else
return 0;
}
void LcdDisplayChinse(unsigned char row, unsigned char col, unsigned char * string)
{
if (SetLcdDisplayChinsePos(row, col))
{
SendDat(*string);
SendDat(*(string + 1));
}
}
void LcdDisplayString(unsigned char * string)
{
while(*string) SendDat(*string ++);
}
//////////////////////////////////////////
FILE *f;
int n,fd;
main(void)
{
char num,status=0;
int i,j,count;
int ch;
printf("start
");
if((fd = open("/dev/mem", O_RDWR | O_SYNC)) == -1){
DEBUGMSG(DEBUG_ERR, "gpio: Error opening /dev/mem
");
exit(-1);
}
//map 0xffff
map_base = mmap(0, MAP_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, AT91_SYS);//AT91_SYS = 0xffff f000
*((volatile unsigned int*)(map_base + ((PIOC_OFFSET + AT91_PIO_PER )))) = (0x1<<15)|(0x1<<14); //PC15 PC14 as gpio ;1 bit set to GPIO and zero bit no effect
*((volatile unsigned int*)(map_base + ((PIOC_OFFSET + AT91_PIO_OER )))) = (0x1<<15)|(0x1<<14);;//as output
*((volatile unsigned int*)(map_base + ((PIOC_OFFSET + AT91_PIO_PUER )))) = (0x1<<15)|(0x1<<14);;//use up resistor
initlcm();
SendCMD(0x81);//1000,0001 设定DDRAM 7位地址000，0001到地址计数器AC
SendDat(0x33);
SendDat(0x42);
SendDat(0x43);
SendDat(0x44);
SendCMD(0x00);
SetLcdDisplayChinsePos(0, 0);//汉字定位到上行左端
LcdDisplayString("汉字显示演示程序");
delay(65535);
SetLcdDisplayCharPos(1,0);//字符定位到下行左端
LcdDisplayString("0123456789ABCDEF");
delay(65535);
for(;;)
{
delay(100);
display(0x80,0xb0,0xb2);
display(0x81,0xbb,0xD5);
display(0x82,0xb5,0xe7);
display(0x83,0xc1,0xA6);
display(0x84,0xc5,0xe0);
display(0x85,0xD1,0xb5);
display(0x86,0xd6,0xD0);
display(0x87,0xd0,0xc4);
delay(65000);
SendCMD(0x00);
delay(100);
display(0x90,0xb0,0xb2);
display(0x91,0xbb,0xD5);
display(0x92,0xb5,0xe7);
display(0x93,0xc1,0xA6);
display(0x94,0xc5,0xe0);
display(0x95,0xD1,0xb5);
display(0x96,0xd6,0xD0);
display(0x97,0xd0,0xc4);
delay(65000);
SendCMD(0x00);
delay(100);
display(0x88,0xb0,0xb2);
display(0x89,0xbb,0xD5);
display(0x8A,0xb5,0xe7);
display(0x8B,0xc1,0xA6);
display(0x8C,0xc5,0xe0);
display(0x8D,0xD1,0xb5);
display(0x8E,0xd6,0xD0);
display(0x8F,0xd0,0xc4);
delay(65000);
SendCMD(0x00);
delay(100);
display(0x98,0xb0,0xb2);
display(0x99,0xbb,0xD5);
display(0x9A,0xb5,0xe7);
display(0x9B,0xc1,0xA6);
display(0x9C,0xc5,0xe0);
display(0x9D,0xD1,0xb5);
display(0x9E,0xd6,0xD0);
display(0x9F,0xd0,0xc4);
delay(65000);
SendCMD(0x00);
}
close(fd);
}
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