📄 lcd.c
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/*
** lcd.c
**
** LCD 3310 driver
** Unbuffered version - very small memory footprint
** Target: ATMEGA128 :: AVR-GCC
**
** Written by Tony Myatt - 2007
** Quantum Torque - www.quantumtorque.com
*/
#include <stdio.h>
#include <avr/io.h>
#include <avr/pgmspace.h>
#include <avr/interrupt.h>
#include <util/delay.h>#include "lcd.h"
/* delay macro function */
#define lcd_delay() for(int i=-32000;i<32000;i++)
/* Command type sent to the lcd */
typedef enum { LCD_CMD = 0, LCD_DATA = 1 } LcdCmdData;
/* Function prototypes */
void lcd_base_addr(unsigned int addr);
void lcd_send(unsigned char data, LcdCmdData cd);
/* The lcd cursor position */
int lcdCacheIdx;
/* Alphabet lookup */
unsigned char PROGMEM font5x7 [][5] = {
{ 0x00, 0x00, 0x00, 0x00, 0x00 }, // sp
{ 0x00, 0x00, 0x2f, 0x00, 0x00 }, // !
{ 0x00, 0x07, 0x00, 0x07, 0x00 }, // "
{ 0x14, 0x7f, 0x14, 0x7f, 0x14 }, // #
{ 0x24, 0x2a, 0x7f, 0x2a, 0x12 }, // $
{ 0x32, 0x34, 0x08, 0x16, 0x26 }, // %
{ 0x36, 0x49, 0x55, 0x22, 0x50 }, // &
{ 0x00, 0x05, 0x03, 0x00, 0x00 }, // '
{ 0x00, 0x1c, 0x22, 0x41, 0x00 }, // (
{ 0x00, 0x41, 0x22, 0x1c, 0x00 }, // )
{ 0x14, 0x08, 0x3E, 0x08, 0x14 }, // *
{ 0x08, 0x08, 0x3E, 0x08, 0x08 }, // +
{ 0x00, 0x00, 0x50, 0x30, 0x00 }, // ,
{ 0x10, 0x10, 0x10, 0x10, 0x10 }, // -
{ 0x00, 0x60, 0x60, 0x00, 0x00 }, // .
{ 0x20, 0x10, 0x08, 0x04, 0x02 }, // /
{ 0x3E, 0x51, 0x49, 0x45, 0x3E }, // 0
{ 0x00, 0x42, 0x7F, 0x40, 0x00 }, // 1
{ 0x42, 0x61, 0x51, 0x49, 0x46 }, // 2
{ 0x21, 0x41, 0x45, 0x4B, 0x31 }, // 3
{ 0x18, 0x14, 0x12, 0x7F, 0x10 }, // 4
{ 0x27, 0x45, 0x45, 0x45, 0x39 }, // 5
{ 0x3C, 0x4A, 0x49, 0x49, 0x30 }, // 6
{ 0x01, 0x71, 0x09, 0x05, 0x03 }, // 7
{ 0x36, 0x49, 0x49, 0x49, 0x36 }, // 8
{ 0x06, 0x49, 0x49, 0x29, 0x1E }, // 9
{ 0x00, 0x36, 0x36, 0x00, 0x00 }, // :
{ 0x00, 0x56, 0x36, 0x00, 0x00 }, // ;
{ 0x08, 0x14, 0x22, 0x41, 0x00 }, // <
{ 0x14, 0x14, 0x14, 0x14, 0x14 }, // =
{ 0x00, 0x41, 0x22, 0x14, 0x08 }, // >
{ 0x02, 0x01, 0x51, 0x09, 0x06 }, // ?
{ 0x32, 0x49, 0x59, 0x51, 0x3E }, // @
{ 0x7E, 0x11, 0x11, 0x11, 0x7E }, // A
{ 0x7F, 0x49, 0x49, 0x49, 0x36 }, // B
{ 0x3E, 0x41, 0x41, 0x41, 0x22 }, // C
{ 0x7F, 0x41, 0x41, 0x22, 0x1C }, // D
{ 0x7F, 0x49, 0x49, 0x49, 0x41 }, // E
{ 0x7F, 0x09, 0x09, 0x09, 0x01 }, // F
{ 0x3E, 0x41, 0x49, 0x49, 0x7A }, // G
{ 0x7F, 0x08, 0x08, 0x08, 0x7F }, // H
{ 0x00, 0x41, 0x7F, 0x41, 0x00 }, // I
{ 0x20, 0x40, 0x41, 0x3F, 0x01 }, // J
{ 0x7F, 0x08, 0x14, 0x22, 0x41 }, // K
{ 0x7F, 0x40, 0x40, 0x40, 0x40 }, // L
{ 0x7F, 0x02, 0x0C, 0x02, 0x7F }, // M
{ 0x7F, 0x04, 0x08, 0x10, 0x7F }, // N
{ 0x3E, 0x41, 0x41, 0x41, 0x3E }, // O
{ 0x7F, 0x09, 0x09, 0x09, 0x06 }, // P
{ 0x3E, 0x41, 0x51, 0x21, 0x5E }, // Q
{ 0x7F, 0x09, 0x19, 0x29, 0x46 }, // R
{ 0x46, 0x49, 0x49, 0x49, 0x31 }, // S
{ 0x01, 0x01, 0x7F, 0x01, 0x01 }, // T
{ 0x3F, 0x40, 0x40, 0x40, 0x3F }, // U
{ 0x1F, 0x20, 0x40, 0x20, 0x1F }, // V
{ 0x3F, 0x40, 0x38, 0x40, 0x3F }, // W
{ 0x63, 0x14, 0x08, 0x14, 0x63 }, // X
{ 0x07, 0x08, 0x70, 0x08, 0x07 }, // Y
{ 0x61, 0x51, 0x49, 0x45, 0x43 }, // Z
{ 0x00, 0x7F, 0x41, 0x41, 0x00 }, // [
{ 0x55, 0x2A, 0x55, 0x2A, 0x55 }, // 55
{ 0x00, 0x41, 0x41, 0x7F, 0x00 }, // ]
{ 0x04, 0x02, 0x01, 0x02, 0x04 }, // ^
{ 0x40, 0x40, 0x40, 0x40, 0x40 }, // _
{ 0x00, 0x01, 0x02, 0x04, 0x00 }, // '
{ 0x20, 0x54, 0x54, 0x54, 0x78 }, // a
{ 0x7F, 0x48, 0x44, 0x44, 0x38 }, // b
{ 0x38, 0x44, 0x44, 0x44, 0x20 }, // c
{ 0x38, 0x44, 0x44, 0x48, 0x7F }, // d
{ 0x38, 0x54, 0x54, 0x54, 0x18 }, // e
{ 0x08, 0x7E, 0x09, 0x01, 0x02 }, // f
{ 0x0C, 0x52, 0x52, 0x52, 0x3E }, // g
{ 0x7F, 0x08, 0x04, 0x04, 0x78 }, // h
{ 0x00, 0x44, 0x7D, 0x40, 0x00 }, // i
{ 0x20, 0x40, 0x44, 0x3D, 0x00 }, // j
{ 0x7F, 0x10, 0x28, 0x44, 0x00 }, // k
{ 0x00, 0x41, 0x7F, 0x40, 0x00 }, // l
{ 0x7C, 0x04, 0x18, 0x04, 0x78 }, // m
{ 0x7C, 0x08, 0x04, 0x04, 0x78 }, // n
{ 0x38, 0x44, 0x44, 0x44, 0x38 }, // o
{ 0x7C, 0x14, 0x14, 0x14, 0x08 }, // p
{ 0x08, 0x14, 0x14, 0x18, 0x7C }, // q
{ 0x7C, 0x08, 0x04, 0x04, 0x08 }, // r
{ 0x48, 0x54, 0x54, 0x54, 0x20 }, // s
{ 0x04, 0x3F, 0x44, 0x40, 0x20 }, // t
{ 0x3C, 0x40, 0x40, 0x20, 0x7C }, // u
{ 0x1C, 0x20, 0x40, 0x20, 0x1C }, // v
{ 0x3C, 0x40, 0x30, 0x40, 0x3C }, // w
{ 0x44, 0x28, 0x10, 0x28, 0x44 }, // x
{ 0x0C, 0x50, 0x50, 0x50, 0x3C }, // y
{ 0x44, 0x64, 0x54, 0x4C, 0x44 }, // z
};
/* Performs IO & LCD controller initialization */
void lcd_init(void)
{
// Pull-up on reset pin
LCD_PORT |= LCD_RST_PIN;
// Set output bits on lcd port
LCD_DDR |= LCD_RST_PIN | LCD_CE_PIN | LCD_DC_PIN | LCD_DATA_PIN | LCD_CLK_PIN;
// Wait after VCC high for reset (max 30ms)
_delay_ms(15);
// Toggle display reset pin
LCD_PORT &= ~LCD_RST_PIN;
lcd_delay();
LCD_PORT |= LCD_RST_PIN;
// Disable LCD controller
LCD_PORT |= LCD_CE_PIN;
lcd_send(0x21, LCD_CMD); // LCD Extended Commands
lcd_send(0xC8, LCD_CMD); // Set LCD Vop(Contrast)
lcd_send(0x06, LCD_CMD); // Set Temp coefficent
lcd_send(0x13, LCD_CMD); // LCD bias mode 1:48
lcd_send(0x20, LCD_CMD); // Standard Commands, Horizontal addressing
lcd_send(0x0C, LCD_CMD); // LCD in normal mode
// Clear lcd
lcd_clear();
// For using printf
fdevopen(lcd_chr, 0);
}
/* Set display contrast. Note: No change is visible at ambient temperature */
void lcd_contrast(unsigned char contrast)
{
lcd_send(0x21, LCD_CMD); // LCD Extended Commands
lcd_send(0x80 | contrast, LCD_CMD); // Set LCD Vop(Contrast)
lcd_send(0x20, LCD_CMD); // LCD std cmds, hori addr mode
}
/* Clears the display */
void lcd_clear(void)
{
lcdCacheIdx = 0;
lcd_base_addr(lcdCacheIdx);
// Set the entire cache to zero and write 0s to lcd
for(int i=0;i<LCD_CACHE_SIZE;i++) {
lcd_send(0, LCD_DATA);
}
}
/* Clears an area on a line */
void lcd_clear_area(unsigned char line, unsigned char startX, unsigned char endX)
{
// Start and end positions of line
int start = (line-1)*84+(startX-1);
int end = (line-1)*84+(endX-1);
lcd_base_addr(start);
// Clear all data in range from cache
for(unsigned int i=start;i<end;i++) {
lcd_send(0, LCD_DATA);
}
}
/* Clears an entire text block. (rows of 8 pixels on the lcd) */
void lcd_clear_line(unsigned char line)
{
lcd_clear_area(line, 1, LCD_X_RES);
}
/* Sets cursor location to xy location corresponding to basic font size */
void lcd_goto_xy(unsigned char x, unsigned char y)
{
lcdCacheIdx = (x-1)*6 + (y-1)*84;
}
/* Sets cursor location to exact xy pixel location on the lcd */
void lcd_goto_xy_exact(unsigned char x, unsigned char y)
{
lcdCacheIdx = (x-1) + (y-1)*84;
}
/* Displays a character at current cursor location */
void lcd_chr(char chr)
{
lcd_base_addr(lcdCacheIdx);
// 5 pixel wide characters and add space
for(unsigned char i=0;i<5;i++) {
lcd_send(pgm_read_byte(&font5x7[chr-32][i]) << 1, LCD_DATA);
}
lcd_send(0, LCD_DATA);
lcdCacheIdx += 6;
}
/* Displays string at current cursor location and increment cursor location */
void lcd_str(char *str)
{
while(*str) {
lcd_chr(*str++);
}
}
// Set the base address of the lcd
void lcd_base_addr(unsigned int addr) {
lcd_send(0x80 |(addr % LCD_X_RES), LCD_CMD);
lcd_send(0x40 |(addr / LCD_X_RES), LCD_CMD);
}
/* Sends data to display controller */
void lcd_send(unsigned char data, LcdCmdData cd)
{
// Data/DC are outputs for the lcd (all low)
LCD_DDR |= LCD_DATA_PIN | LCD_DC_PIN;
// Enable display controller (active low)
LCD_PORT &= ~LCD_CE_PIN;
// Either command or data
if(cd == LCD_DATA) {
LCD_PORT |= LCD_DC_PIN;
} else {
LCD_PORT &= ~LCD_DC_PIN;
}
for(unsigned char i=0;i<8;i++) {
// Set the DATA pin value
if((data>>(7-i)) & 0x01) {
LCD_PORT |= LCD_DATA_PIN;
} else {
LCD_PORT &= ~LCD_DATA_PIN;
}
// Toggle the clock
LCD_PORT |= LCD_CLK_PIN;
LCD_PORT &= ~LCD_CLK_PIN;
}
// Disable display controller
LCD_PORT |= LCD_CE_PIN;
// Data/DC can be used as button inputs when not sending to LCD (/w pullups)
LCD_DDR &= ~(LCD_DATA_PIN | LCD_DC_PIN);
LCD_PORT |= LCD_DATA_PIN | LCD_DC_PIN;
}
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