1 | #define F_CPU 4000000UL
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2 | #include <avr/delay.h>
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3 |
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4 | #include <avr/io.h>
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5 |
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6 |
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7 | /*LCD function declarations */
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8 | void LCD_send_command(unsigned char cmnd);
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9 | void LCD_send_data(unsigned char data);
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10 | void LCD_init();
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11 | void LCD_goto(unsigned char y, unsigned char x);
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12 | void LCD_print(char *string);
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13 | void LCD_blink();
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14 | void LCD_scroll(unsigned char direction);
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15 |
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16 | #define LCD_DATA_PORT PORTC
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17 | #define LCD_DATA_DDR DDRC
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18 | #define LCD_DATA_PIN PINC
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19 |
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20 | #define LCD_CNTRL_PORT PORTD
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21 | #define LCD_CNTRL_DDR DDRD
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22 | #define LCD_CNTRL_PIN PIND
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23 |
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24 | #define LCD_RS_PIN 2
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25 | #define LCD_RW_PIN 3
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26 | #define LCD_ENABLE_PIN 4
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27 |
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28 | int main(void)
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29 | {
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30 | unsigned char i;
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31 |
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32 | LCD_init();
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33 | LCD_goto(1,2);
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34 | LCD_print("AVR TUTORIALS");
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35 | LCD_goto(2,1);
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36 | LCD_print("WELCOMES YOU");
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37 |
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38 | while(1)
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39 | {/*
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40 | for(i=0;i<2;i++)
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41 | LCD_blink();
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42 |
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43 | for(i=0;i<2;i++)
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44 | LCD_scroll(0);
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45 |
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46 | for(i=0;i<4;i++)
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47 | LCD_scroll(1);
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48 |
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49 | for(i=0;i<2;i++)
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50 | LCD_scroll(0);*/
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51 | }
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52 | }
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53 |
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54 | /* This function sends a command 'cmnd' to the LCD module*/
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55 | void LCD_send_command(unsigned char cmnd)
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56 | {
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57 | LCD_DATA_PORT = cmnd;
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58 | LCD_CNTRL_PORT &= ~(1<<LCD_RW_PIN);
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59 | LCD_CNTRL_PORT &= ~(1<<LCD_RS_PIN);
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60 |
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61 | LCD_CNTRL_PORT |= (1<<LCD_ENABLE_PIN);
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62 | _delay_us(2);
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63 | LCD_CNTRL_PORT &= ~(1<<LCD_ENABLE_PIN);
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64 | _delay_us(100);
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65 | }
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66 |
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67 | /* This function sends the data 'data' to the LCD module*/
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68 | void LCD_send_data(unsigned char data)
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69 | {
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70 | LCD_DATA_PORT = data;
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71 | LCD_CNTRL_PORT &= ~(1<<LCD_RW_PIN);
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72 | LCD_CNTRL_PORT |= (1<<LCD_RS_PIN);
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73 |
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74 | LCD_CNTRL_PORT |= (1<<LCD_ENABLE_PIN);
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75 | _delay_us(2);
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76 | LCD_CNTRL_PORT &= ~(1<<LCD_ENABLE_PIN);
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77 | _delay_us(100);
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78 | }
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79 |
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80 | void LCD_init()
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81 | {
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82 | LCD_CNTRL_DDR = 0xFF;
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83 | LCD_CNTRL_PORT = 0x00;
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84 | LCD_DATA_DDR = 0xFF;
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85 | LCD_DATA_PORT = 0x00;
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86 |
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87 | _delay_ms(10);
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88 | LCD_send_command(0x38);
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89 | LCD_send_command(0x0C);
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90 | LCD_send_command(0x01);
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91 | _delay_ms(10);
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92 | LCD_send_command(0x06);
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93 | }
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94 |
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95 | /* This function moves the cursor the line y column x on the LCD module*/
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96 | void LCD_goto(unsigned char y, unsigned char x)
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97 | {
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98 | unsigned char firstAddress[] = {0x80,0xC0,0x94,0xD4};
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99 |
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100 | LCD_send_command(firstAddress[y-1] + x-1);
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101 | _delay_ms(10);
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102 | }
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103 |
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104 | void LCD_print(char *string)
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105 | {
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106 | unsigned char i;
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107 |
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108 | while(string[i]!=0)
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109 | {
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110 | LCD_send_data(string[i]);
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111 | i++;
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112 | }
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113 | }
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114 |
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115 | void LCD_blink()
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116 | {
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117 | LCD_send_command(0x08);
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118 | _delay_ms(250);
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119 | LCD_send_command(0x0C);
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120 | _delay_ms(250);
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121 | }
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122 |
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123 | void LCD_scroll(unsigned char direction)
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124 | {
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125 | if(direction == 0)
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126 | LCD_send_command(0x18);
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127 | else
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128 | LCD_send_command(0x1C);
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129 |
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130 | _delay_ms(500);
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131 | }
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