226 lines
3.8 KiB
C
226 lines
3.8 KiB
C
/*
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* Author: Jake Goodwin
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* Date: 2022
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* Description: Interfacing with a 1602LCD only with the uc no perifs
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*/
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#include <avr/io.h>
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#include <avr/interrupt.h>
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#include <avr/sleep.h>
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#include <util/delay.h>
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#define RS_PORT PORTD
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#define RS_PIN PIND0
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#define RS_DDR DDD0
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//#define RW_PORT PORTD
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//#define RW_PIN PIND1
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//#define RW_DDR DDD1
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#define ENA_PORT PORTD
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#define ENA_PIN PIND1
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#define ENA_DDR DDD1
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#define BIT4_PORT PORTD
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#define BIT4_PIN PIND4
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#define BIT4_DDR DDD4
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#define BIT5_PORT PORTD
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#define BIT5_PIN PIND5
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#define BIT5_DDR DDD5
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#define BIT6_PORT PORTD
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#define BIT6_PIN PIND6
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#define BIT6_DDR DDD6
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#define BIT7_PORT PORTD
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#define BIT7_PIN PIND7
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#define BIT7_DDR DDD7
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#define LED_PIN PINC0
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#define LED_PORT PORTC
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#define LED_DDR DDC0
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//LCD CONNECTIONS:
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/*
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* VSS --> GND
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* VDD --> VCC
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* V0 --> POT --> GND
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* RS --> PD0(AVR)
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* RW --> GND
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* E --> PD1(AVR)
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* D4 --> PD4(AVR)
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* D5 --> PD5(AVR)
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* D6 --> PD6(AVR)
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* D7 --> PD7(AVR)
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*
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* PURPOSE:
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* RS: register select,
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* RW: Read/Write select signal,
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* E: Operation(data read/write) enable signal.
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* DB0~DB3: not used for 4bit operations.
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* DB4~DB7: high order three-state data lines.
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*/
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//#############################
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//MACROS
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//#############################
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//already defined
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//#define _BV(bit) (1 << bit)
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#define setbit(port, bit) (port) |= (1 << (bit))
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#define clearbit(port, bit) (port) &= ~(1 << (bit))
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//#############################
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//FUNCTION PROTOTYPES
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//#############################
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void init_lcd(void);
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//void cmd_lcd(uint8_t cmd);
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void cmd_nibble_lcd(uint8_t cmd);
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void clear_lcd(void);
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static void led_blink(void);
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void set_lcd_one_line_(void);
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void set_lcd_two_line(void);
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void return_home_lcd(void);
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void turn_off_lcd(void);
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void turn_on_lcd(void);
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void set_cgram_lcd_address(uint8_t addr);
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void set_ddram_lcd_address(uint8_t addr);
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void write_lcd_address(uint8_t addr);
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int main() {
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//SETUP HERE.
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_delay_ms(500);
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while(1) {
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led_blink();
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_delay_ms(1000);
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set_lcd_one_line();
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_delay_ms(1000);
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set_lcd_two_line();
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}
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return 0;
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}
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//#############################
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//FUNCTIONS
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//#############################
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void init_lcd(void) {
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//allow us to read pin7
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DDRD = 0x00;
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setbit(DDRD, BIT7_DDR);
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while(PORTD & (1<<BIT7_PIN)){
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led_blink();
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}
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DDRD = 0xff; //All output
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_delay_ms(20);
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set_lcd_two_line();
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return_home_lcd();
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clear_lcd();
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}
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/*
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* Input: None
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* Outupt: None
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* Description: Sets the LCD into 4bit two line display mode.
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*/
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void set_lcd_two_line(void) {
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cmd_nibble_lcd(0x20);
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cmd_nibble_lcd(0x80);
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}
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void set_lcd_one_line(void) {
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cmd_nibble_lcd(0x20);
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cmd_nibble_lcd(0x00);
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}
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void clear_lcd(void) {
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cmd_nibble_lcd(0x00);
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cmd_nibble_lcd(0x10);
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}
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void return_home_lcd(void) {
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cmd_nibble_lcd(0x00);
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cmd_nibble_lcd(0x20);
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}
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void turn_off_lcd(void) {
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cmd_nibble_lcd(0x00);
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cmd_nibble_lcd(0x80);
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}
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void turn_on_lcd(void) {
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cmd_nibble_lcd(0x00);
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cmd_nibble_lcd(0x80);
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}
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void set_cgram_lcd_address(uint8_t addr) {
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;
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}
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void set_ddram_lcd_address(uint8_t addr) {
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;
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}
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void write_lcd_address(uint8_t addr) {
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;
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}
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//A version that doesn't require multiple calls.
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void cmd_lcd(uint8_t cmd) {
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;
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}
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void cmd_nibble_lcd(uint8_t cmd) {
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DDRD = 0xff;
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PORTD &= 0x0f;
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setbit(PORTD, ENA_PIN);
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PORTD |= cmd;
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_delay_ms(1);
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clearbit(PORTD, ENA_PIN);
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_delay_ms(1);
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}
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/*
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* Input: None
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* Output: None
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* Description: Toggles the pin for the LED indicator.
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*/
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static void led_blink(void) {
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//Set the DDR for output.
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DDRC |= (1<<LED_PIN);
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PORTC ^= (1<<LED_PIN);
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_delay_ms(250);
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PORTC ^= (1<<LED_PIN);
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_delay_ms(250);
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}
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