Barış Bilgin Şenol
/
LCD_Test
12864 GLCD
myLCD/myLCD.cpp@0:c46d8f8adbd7, 2019-05-29 (annotated)
- Committer:
- Bilgin
- Date:
- Wed May 29 18:36:43 2019 +0000
- Revision:
- 0:c46d8f8adbd7
Microp
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
Bilgin | 0:c46d8f8adbd7 | 1 | #include "myLCD.h" |
Bilgin | 0:c46d8f8adbd7 | 2 | /** |
Bilgin | 0:c46d8f8adbd7 | 3 | myLCD::myLCD(PinName _DI, PinName _RW, PinName _EN, PinName _CS1, PinName _CS2, BusInOut *BUSLCD){ |
Bilgin | 0:c46d8f8adbd7 | 4 | DI = new DigitalOut(_DI); |
Bilgin | 0:c46d8f8adbd7 | 5 | RW = new DigitalOut(_RW); |
Bilgin | 0:c46d8f8adbd7 | 6 | EN = new DigitalOut(_EN); |
Bilgin | 0:c46d8f8adbd7 | 7 | CS1 = new DigitalOut(_CS1); |
Bilgin | 0:c46d8f8adbd7 | 8 | CS2 = new DigitalOut(_CS2); |
Bilgin | 0:c46d8f8adbd7 | 9 | LCD_PORT = BUS_LCD; |
Bilgin | 0:c46d8f8adbd7 | 10 | }*/ |
Bilgin | 0:c46d8f8adbd7 | 11 | myLCD::myLCD(PinName _DI, PinName _RW, PinName _EN, PinName _CS1, PinName _CS2, BusInOut *BUSLCD):DI(_DI),RW(_RW),EN(_EN),CS1(_CS1),CS2(_CS2){ |
Bilgin | 0:c46d8f8adbd7 | 12 | LCD_PORT = BUSLCD; |
Bilgin | 0:c46d8f8adbd7 | 13 | } |
Bilgin | 0:c46d8f8adbd7 | 14 | |
Bilgin | 0:c46d8f8adbd7 | 15 | void myLCD::pulse_en(){ |
Bilgin | 0:c46d8f8adbd7 | 16 | EN = 1; |
Bilgin | 0:c46d8f8adbd7 | 17 | wait_us(8); |
Bilgin | 0:c46d8f8adbd7 | 18 | EN = 0; |
Bilgin | 0:c46d8f8adbd7 | 19 | wait_us(8); |
Bilgin | 0:c46d8f8adbd7 | 20 | } |
Bilgin | 0:c46d8f8adbd7 | 21 | |
Bilgin | 0:c46d8f8adbd7 | 22 | void myLCD::lcd_on(){ |
Bilgin | 0:c46d8f8adbd7 | 23 | DI = 0; |
Bilgin | 0:c46d8f8adbd7 | 24 | RW = 0; |
Bilgin | 0:c46d8f8adbd7 | 25 | EN = 0; |
Bilgin | 0:c46d8f8adbd7 | 26 | CS1 = 0; |
Bilgin | 0:c46d8f8adbd7 | 27 | CS2 = 0; |
Bilgin | 0:c46d8f8adbd7 | 28 | LCD_PORT->output(); |
Bilgin | 0:c46d8f8adbd7 | 29 | wait_us(2); |
Bilgin | 0:c46d8f8adbd7 | 30 | LCD_PORT->write(0x3F); |
Bilgin | 0:c46d8f8adbd7 | 31 | wait_us(2); |
Bilgin | 0:c46d8f8adbd7 | 32 | pulse_en(); |
Bilgin | 0:c46d8f8adbd7 | 33 | } |
Bilgin | 0:c46d8f8adbd7 | 34 | |
Bilgin | 0:c46d8f8adbd7 | 35 | void myLCD::write_byte(unsigned short byte){ |
Bilgin | 0:c46d8f8adbd7 | 36 | DI = 1; //high -> data |
Bilgin | 0:c46d8f8adbd7 | 37 | RW = 0; //low -> write |
Bilgin | 0:c46d8f8adbd7 | 38 | LCD_PORT->write(byte); |
Bilgin | 0:c46d8f8adbd7 | 39 | wait_us(2); |
Bilgin | 0:c46d8f8adbd7 | 40 | pulse_en(); |
Bilgin | 0:c46d8f8adbd7 | 41 | } |
Bilgin | 0:c46d8f8adbd7 | 42 | |
Bilgin | 0:c46d8f8adbd7 | 43 | //returns the value into @param &byte |
Bilgin | 0:c46d8f8adbd7 | 44 | short myLCD::read_byte(unsigned short col, unsigned short page){ |
Bilgin | 0:c46d8f8adbd7 | 45 | unsigned short temp; |
Bilgin | 0:c46d8f8adbd7 | 46 | set_xy(col, page); // this function reads data from current location |
Bilgin | 0:c46d8f8adbd7 | 47 | LCD_PORT->input(); //set as input |
Bilgin | 0:c46d8f8adbd7 | 48 | DI = 1; //high -> data |
Bilgin | 0:c46d8f8adbd7 | 49 | RW = 1; //high -> read |
Bilgin | 0:c46d8f8adbd7 | 50 | CS1 = (col>63); |
Bilgin | 0:c46d8f8adbd7 | 51 | CS2 = !CS1; |
Bilgin | 0:c46d8f8adbd7 | 52 | wait_us(1); |
Bilgin | 0:c46d8f8adbd7 | 53 | EN = 1; //latches data into output register |
Bilgin | 0:c46d8f8adbd7 | 54 | wait_us(1); |
Bilgin | 0:c46d8f8adbd7 | 55 | |
Bilgin | 0:c46d8f8adbd7 | 56 | EN = 0; //dummy read |
Bilgin | 0:c46d8f8adbd7 | 57 | wait_us(5); //waits while lcd fetches data |
Bilgin | 0:c46d8f8adbd7 | 58 | EN = 1; //latch data from output register into data register |
Bilgin | 0:c46d8f8adbd7 | 59 | wait_us(1); |
Bilgin | 0:c46d8f8adbd7 | 60 | |
Bilgin | 0:c46d8f8adbd7 | 61 | temp = LCD_PORT->read(); //data is saved onto byte from the caller |
Bilgin | 0:c46d8f8adbd7 | 62 | EN = 0; //remove data from the bus |
Bilgin | 0:c46d8f8adbd7 | 63 | wait_us(1); |
Bilgin | 0:c46d8f8adbd7 | 64 | LCD_PORT->output(); //set bus as output again |
Bilgin | 0:c46d8f8adbd7 | 65 | wait_us(2); |
Bilgin | 0:c46d8f8adbd7 | 66 | return temp; |
Bilgin | 0:c46d8f8adbd7 | 67 | } |
Bilgin | 0:c46d8f8adbd7 | 68 | |
Bilgin | 0:c46d8f8adbd7 | 69 | //@param col should be 0<=col<128 |
Bilgin | 0:c46d8f8adbd7 | 70 | void myLCD::set_col(unsigned short col){ |
Bilgin | 0:c46d8f8adbd7 | 71 | unsigned short col_data; |
Bilgin | 0:c46d8f8adbd7 | 72 | DI = 0; //low -> instruction |
Bilgin | 0:c46d8f8adbd7 | 73 | RW = 0; //low -> write |
Bilgin | 0:c46d8f8adbd7 | 74 | |
Bilgin | 0:c46d8f8adbd7 | 75 | //0-63 |
Bilgin | 0:c46d8f8adbd7 | 76 | if(col < 64){ |
Bilgin | 0:c46d8f8adbd7 | 77 | CS1 = 0; //select chip1 |
Bilgin | 0:c46d8f8adbd7 | 78 | CS2 = 1; //deselect chip2 |
Bilgin | 0:c46d8f8adbd7 | 79 | col_data = col; |
Bilgin | 0:c46d8f8adbd7 | 80 | } |
Bilgin | 0:c46d8f8adbd7 | 81 | else //64-127 |
Bilgin | 0:c46d8f8adbd7 | 82 | { |
Bilgin | 0:c46d8f8adbd7 | 83 | CS1 = 1; //deselect chip1 |
Bilgin | 0:c46d8f8adbd7 | 84 | CS2 = 0; //select chip2 |
Bilgin | 0:c46d8f8adbd7 | 85 | col_data = col - 64; |
Bilgin | 0:c46d8f8adbd7 | 86 | } |
Bilgin | 0:c46d8f8adbd7 | 87 | //command formatting 01CCCCC -> C: column |
Bilgin | 0:c46d8f8adbd7 | 88 | col_data = (col_data | 0x40) & 0x7F; |
Bilgin | 0:c46d8f8adbd7 | 89 | LCD_PORT->write(col_data); |
Bilgin | 0:c46d8f8adbd7 | 90 | wait_us(2); |
Bilgin | 0:c46d8f8adbd7 | 91 | pulse_en(); |
Bilgin | 0:c46d8f8adbd7 | 92 | } |
Bilgin | 0:c46d8f8adbd7 | 93 | |
Bilgin | 0:c46d8f8adbd7 | 94 | void myLCD::set_row(unsigned short row){ |
Bilgin | 0:c46d8f8adbd7 | 95 | unsigned short row_data; |
Bilgin | 0:c46d8f8adbd7 | 96 | DI = 0; //low -> instruction |
Bilgin | 0:c46d8f8adbd7 | 97 | RW = 0; //low -> write |
Bilgin | 0:c46d8f8adbd7 | 98 | //command formatting 10111PPP -> P: page |
Bilgin | 0:c46d8f8adbd7 | 99 | row_data = (row | 0xB8) & 0xBF; //or with 10111000, and with 10111111. last 3 bits is the page |
Bilgin | 0:c46d8f8adbd7 | 100 | LCD_PORT->write(row_data); |
Bilgin | 0:c46d8f8adbd7 | 101 | wait_us(2); |
Bilgin | 0:c46d8f8adbd7 | 102 | pulse_en(); |
Bilgin | 0:c46d8f8adbd7 | 103 | } |
Bilgin | 0:c46d8f8adbd7 | 104 | |
Bilgin | 0:c46d8f8adbd7 | 105 | void myLCD::set_xy(unsigned short col, unsigned short page){ |
Bilgin | 0:c46d8f8adbd7 | 106 | set_col(col); |
Bilgin | 0:c46d8f8adbd7 | 107 | set_row(page); |
Bilgin | 0:c46d8f8adbd7 | 108 | } |
Bilgin | 0:c46d8f8adbd7 | 109 | |
Bilgin | 0:c46d8f8adbd7 | 110 | void myLCD::clear(){ |
Bilgin | 0:c46d8f8adbd7 | 111 | for(short n = 0; n < 8; n++){ |
Bilgin | 0:c46d8f8adbd7 | 112 | set_xy(0,n); |
Bilgin | 0:c46d8f8adbd7 | 113 | set_xy(64,n); //at this point, cs2 is selected |
Bilgin | 0:c46d8f8adbd7 | 114 | CS1 = 1; //select cs1 as well |
Bilgin | 0:c46d8f8adbd7 | 115 | for(short i = 0; i < 64; i++) |
Bilgin | 0:c46d8f8adbd7 | 116 | write_byte(0); |
Bilgin | 0:c46d8f8adbd7 | 117 | } |
Bilgin | 0:c46d8f8adbd7 | 118 | } |
Bilgin | 0:c46d8f8adbd7 | 119 | |
Bilgin | 0:c46d8f8adbd7 | 120 | //@param color = true, draws white. clears otherwise |
Bilgin | 0:c46d8f8adbd7 | 121 | void myLCD::draw_point(unsigned short x, unsigned short y, bool color){ |
Bilgin | 0:c46d8f8adbd7 | 122 | short data; |
Bilgin | 0:c46d8f8adbd7 | 123 | short byte = read_byte(x, (y/8)); //byte has the point's 8bit data |
Bilgin | 0:c46d8f8adbd7 | 124 | |
Bilgin | 0:c46d8f8adbd7 | 125 | if(color){ //paint the point |
Bilgin | 0:c46d8f8adbd7 | 126 | data = ~(1 << (y % 8)) & byte; |
Bilgin | 0:c46d8f8adbd7 | 127 | } |
Bilgin | 0:c46d8f8adbd7 | 128 | else{ //clear the point |
Bilgin | 0:c46d8f8adbd7 | 129 | data = (1 << (y % 8)) | byte; |
Bilgin | 0:c46d8f8adbd7 | 130 | } |
Bilgin | 0:c46d8f8adbd7 | 131 | set_xy(x, y/8); |
Bilgin | 0:c46d8f8adbd7 | 132 | write_byte(data); |
Bilgin | 0:c46d8f8adbd7 | 133 | } |