sample_lcd_project.c

在nios环境下的LCD的包括测试

#include <stdio.h>
#include<io.h>
#include<unistd.h>

// define LCD related parameters
#define LCD_BASE_ADDRESS 0x00A20820
//#define LCD_MULTIPLIER   0x4
#define LCD_WR_COMMAND_REG 0x00A20820 //0 for Dynamic
#define LCD_RD_COMMAND_REG 0x00A20824 //1
#define LCD_WR_DATA_REG    0x00A20828 //2
#define LCD_RD_DATA_REG    0x00A2082C //3

// define LCD Local parameters
#define LCD_CLR_DISPLAY    0x1
#define LCD_RETURN_HOME    0x2
#define LCD_INC_DD_ADDR    0x6
#define LCD_DEC_DD_ADDR    0x4
#define LCD_MOVE_DISPLAY   0x5
#define LCD_MOVE_CURSOR    0x4

int lcd_wr_command(int writedata)
{
 int ret_code = 0;
 
 IOWR(LCD_WR_COMMAND_REG, 0, writedata);
 usleep(1);
 
 return (ret_code); 
}


int lcd_wr_data(int writedata)
{
 int ret_code = 0;
 
 IOWR(LCD_WR_DATA_REG, 0, writedata);
 usleep(1);
 
 return (ret_code); 
}


int initialize_lcd(void)
{
 int ret_code = 0;
 
 // Setting 8-bit, 2 line, 5x7 mode - Function Set
 ret_code = lcd_wr_command(0x38);
 usleep(100);
 // Setting 8-bit, 2 line, 5x7 mode - Function Set
 ret_code = lcd_wr_command(0x38);
 usleep(100);
 // Setting Autoincrement mode without display shift - Entry Mode Set
 ret_code = lcd_wr_command(0x06);
 usleep(100);
 // Setting Display ON, Cursor OFF, Blinking OFF - Display Control Set
 ret_code = lcd_wr_command(0x0C);
 usleep(100);
 // Setting Cursor to home and clear display - Additional - Return Home Set
 ret_code = lcd_wr_command(0x02);
 usleep(100);
 // Setting Cursor to home and clear display - Clear Display Set
 ret_code = lcd_wr_command(0x01);
 usleep(100);
 
 return(ret_code);
}


int set_lcd_dd_address(int writedata)
{
 int ret_code = 0;
 
 IOWR(LCD_WR_COMMAND_REG, 0, writedata);
 usleep(1);
 
 return (ret_code);
}


int set_lcd_dd_data(int dd_address, char *dd_data, int data_length)
{
 int ret_code = 0, i;

 ret_code = set_lcd_dd_address(dd_address);
 usleep(1); // 1 ms delay can be used
 
 usleep(1000);
 
 for(i=0;i<data_length;i++)
 {
  ret_code = lcd_wr_data(dd_data[i]); // Write Data
  usleep(1); // 1 ms delay can be used
 }
 
 return (ret_code);
}


int lcd_test (void)
{
 int ret_code = 0;
 char lcd_data1[16] = "www.slscorp.com";
 char lcd_data2[16] = "UP3 Kit        "; 
 
 

 // Initialization sequence
 printf("\nInitializing LCD ...."); 
 ret_code = initialize_lcd();
  
 printf("\nPrinting Data on LCD .....");
 ret_code = set_lcd_dd_data(0x80, lcd_data1, 15);
 ret_code = set_lcd_dd_data(0xC0, lcd_data2, 11);

 printf("\n\nYou can See \"www.slscorp.com UP3 kit   \" Printed on LCD ");
return 0;
}

int main()
{ 
 

 lcd_test();

  return 0;
}