LCD1602几种调试方法（NIOSii）

#include

int main (void)
{
FILE *lcd1;

lcd1 = fopen("/dev/lcd", "w");

if (lcd1 == NULL)
printf("lcd not ready...n");
else
{
printf("lcd ready...n");
fprintf(lcd1, "111111111111111111111n");
}

fclose(lcd1);
printf("can you see something?");

return 0;
}

#include
#includealtera_avalon_lcd_16207_regs.h>
#include
alt_u8 lcd_string1[] = "HELLO";
alt_u8 lcd_string2[] = "2010";
void check_busy() //读液晶的忙标志位并检测
{
alt_u8 status;
do
{
status=IORD_ALTERA_AVALON_LCD_16207_STATUS(LCD_BASE);
}while(status&0x80);
}
void lcd_init() //液晶1602初始化
{
IOWR_ALTERA_AVALON_LCD_16207_COMMAND(LCD_BASE, 0x38); //功能设置
check_busy();
IOWR_ALTERA_AVALON_LCD_16207_COMMAND(LCD_BASE, 0x01); //清屏
check_busy();
IOWR_ALTERA_AVALON_LCD_16207_COMMAND(LCD_BASE, 0x06); //Y地址自动加1模式
check_busy();
IOWR_ALTERA_AVALON_LCD_16207_COMMAND(LCD_BASE, 0x0c); //显示开，不显示光标
}

void lcd_prints(alt_u8 *string) //打印字符串
{
while(*string!=)
{
check_busy();
IOWR_ALTERA_AVALON_LCD_16207_DATA(LCD_BASE, *string);
string++;
}
}
void select_xy(alt_u8 x,alt_u8 y) //选择屏幕坐标，x=0为第1行，x=1为第2行
{ //y=0~15,分别对应第1列到第16列
check_busy();
if(x%2==0)
{
IOWR_ALTERA_AVALON_LCD_16207_COMMAND(LCD_BASE, 0x80+y);
}
else
{
IOWR_ALTERA_AVALON_LCD_16207_COMMAND(LCD_BASE, 0xc0+y);
}
}

int main (void) __attribute__ ((weak, alias ("alt_main"))); //将程序的入口改为alt_main()，可以使
//很多驱动不会加载，可以大大减小代码长度
void alt_main()
{
lcd_init();

select_xy(0,0);
lcd_prints(lcd_string1);

select_xy(1,7);
lcd_prints(lcd_string2);
}

////////////

#include
#include "priv/alt_busy_sleep.h"
#include "system.h"
#include "altera_avalon_pio_regs.h"
#include "alt_types.h"
alt_u8 table[]="i love you";
alt_u8 table1[]="www.renren.cn";
void write_com(alt_u8 command)
{
IOWR_ALTERA_AVALON_PIO_DIRECTION(LCDDATA_BASE,0xff);

IOWR_ALTERA_AVALON_PIO_DATA(LCDDATA_BASE,command);

IOWR_ALTERA_AVALON_PIO_DATA(LCDRS_BASE,0);
alt_busy_sleep(5000);

IOWR_ALTERA_AVALON_PIO_DATA(LCDRW_BASE,0);
alt_busy_sleep(5000);

IOWR_ALTERA_AVALON_PIO_DATA(LCDE_BASE,0);

alt_busy_sleep(5000);

IOWR_ALTERA_AVALON_PIO_DATA(LCDE_BASE,1);
alt_busy_sleep(5000);

IOWR_ALTERA_AVALON_PIO_DATA(LCDE_BASE,0);
alt_busy_sleep(5000);
}
void write_date(alt_u8 date)
{

IOWR_ALTERA_AVALON_PIO_DIRECTION(LCDDATA_BASE,0xff);
IOWR_ALTERA_AVALON_PIO_DATA(LCDDATA_BASE,date);
alt_busy_sleep(5000);

IOWR_ALTERA_AVALON_PIO_DATA(LCDRS_BASE,1);
alt_busy_sleep(5000);
IOWR_ALTERA_AVALON_PIO_DATA(LCDRW_BASE,0);

alt_busy_sleep(5000);
IOWR_ALTERA_AVALON_PIO_DATA(LCDE_BASE,0);

alt_busy_sleep(5000);

IOWR_ALTERA_AVALON_PIO_DATA(LCDE_BASE,1);

alt_busy_sleep(5000);

IOWR_ALTERA_AVALON_PIO_DATA(LCDE_BASE,0);

alt_busy_sleep(5000);
}
void intit()
{
write_com(0x38);

alt_busy_sleep(5000);
write_com(0x0f);

alt_busy_sleep(5000);
write_com(0x06);

alt_busy_sleep(5000);
write_com(0x01);
alt_busy_sleep(5000);
write_com(0x80+0x02);

}
int main()
{
alt_u8 i;
intit();
for(i=0;i<10;i++)
{
write_date(table[i]);;
alt_busy_sleep(5000);
}
write_com(0x80+0x41);
for(i=0;i<14;i++)
{
write_date(table1[i]);;
alt_busy_sleep(5000);
}
while(1);
return 0;
}