lcdController.c

#include <arpa/inet.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
#include <pthread.h>
#include <wiringPi.h>
#include <wiringPiI2C.h>
#include <wiringPi.h>
#include <stdbool.h>

#define I2C_ADDR   0x27 // LCD 주소

#define LCD_CHR  1 // Mode - Sending data
#define LCD_CMD  0 // Mode - Sending command

#define LINE1  0x80 // 첫번째 줄
#define LINE2  0xC0 // 두번째 줄

#define LCD_BACKLIGHT   0x08  // On
// LCD_BACKLIGHT = 0x00  # Off

#define ENABLE  0b00000100 // Enable bit


#define MSG_SIZE 1024

#define IN 0
#define OUT 1
#define PWM 0

#define LOW 0
#define HIGH 1
#define VALUE_MAX 256
#define DIRECTION_MAX 256



void lcd_init(void);
void lcd_byte(int bits, int mode);
void lcd_toggle_enable(int bits);
void lcdLoc(int line); //move cursor
void ClrLcd(void); // clr LCD return home
void typeln(const char *s);
int fd;  // seen by all subroutines

char msg[MSG_SIZE] = {0};
char tempMsg[MSG_SIZE] = {0};
static int PWMExport(int pwmnum) {
#define BUFFER_MAX 3
  char buffer[BUFFER_MAX];
  int fd, byte;

  fd = open("/sys/class/pwm/pwmchip0/export", O_WRONLY);
  if (-1 == fd) {
    fprintf(stderr, "Failed to open export for export!\n");
    return (-1);
  }

  byte = snprintf(buffer, BUFFER_MAX, "%d", pwmnum);
  write(fd, buffer, byte);
  close(fd);

  sleep(1);

  return (0);
}