lcd_tri_1602.c

FPGA应用如sd卡控制

#include "alt_types.h"
#include "lcd_tri_1602.h"
#include "lcd_tri_1602_regs.h"
#include "system.h"
#include <string.h>
#include <stdio.h>
#include <unistd.h>
static alt_u8  busy;

static unsigned char LcdChkBusy(unsigned int base)
 {
    alt_u32 i = 1000000;
   while (IORD_LCD_STATUS(base) & 0x80)//_8DIRECT(LCD_12864_0_BASE,0x1) & 0x80)
    if (--i == 0)
    {
      busy=1;
      return 1;
    } 
    busy=0;
    return 0;
  }
 
static void lcd_write_cmd(unsigned int base, unsigned char command)
 {
 // if(LcdChkBusy(base))
   if(busy)
   return;
   usleep(200);
   IOWR_LCD_COMMAND(base,command);
 }
 
 static void lcd_write_data(unsigned int base, unsigned char data)
 { 
 //if(LcdChkBusy(base))
   if(busy)
   return;
   usleep(200);
 IOWR_LCD_DATA(base, data);
 }
 
void LCD1602_Init(LCD_TRI_1602_dev *dev)
{ 
  unsigned int base = dev->base;
  LcdChkBusy(base);
  lcd_write_cmd(base,0x38);
  usleep(2000);
  lcd_write_cmd(base,0x0C);
  usleep(2000);
  lcd_write_cmd(base,0x01);
  usleep(2000);
  lcd_write_cmd(base,0x06);
  usleep(2000);
  lcd_write_cmd(base,0x80);
  usleep(2000);
 alt_dev_reg (&dev->dev);

}
 
 
int LCD1602_writestring(unsigned int base, unsigned char* ptr, unsigned char line)
{
  int i;
  if(line==1)
   lcd_write_cmd(base,0x80);
  else if(line==2)
   lcd_write_cmd(base,0xC0);
   usleep(2000);
  for(i=0;i<strlen(ptr);i++)
  {
    lcd_write_data(base,ptr[i]);
    usleep(200);
  }
  return 1;
}
 
 int LCD1602_write(alt_fd* fd, const char* ptr, int len)
{
  LCD_TRI_1602_dev * dev = (LCD_TRI_1602_dev*) fd->dev;
  const char * end = ptr + len;
 unsigned int base = dev->base;
  if(*(end-1) == '1')
    lcd_write_cmd(base,0x80);
    else if(*(end-1) == '2')
    lcd_write_cmd(base,0xc0);   
  for ( ; ptr < end-1 ; ptr++)
  {
    usleep(200);
    lcd_write_data(base,*ptr);
    usleep(200);
  }
 return len;
}