终于搞掂树莓派驱动I2C LCD1602 液晶 显示时间 附C 版源码
话说我我已经买了好几个液晶了。。。第一个1602是普通的1602,包括背光共有16个脚，接上线那个乱！这我也忍了，就是在网上找了好多资料，试过N次，驱动不上来，后来我总结：这玩意脚多，不是好东西，于是网上又找了一个集成I2C模块的1602，共四个脚，两个电源，两个数据。
接着又是找了好多资料，我是想找C语言的，包括wiringPi里的examples，都不正常。倒是以下这个脚本能正常显示字来，实在没办法了，就把这个Python脚本用C改写了一下，效果还行，把程序贴出来，方便其他朋友。#!/usr/bin/python
import time
import smbus
BUS = smbus.SMBus(1)
LCD_ADDR = 0x27
#LCD_ADDR = 0x3F sudo i2cdetect -y -a 0
def send_command(comm):
# Send bit7-4 firstly
buf = comm & 0xF0
buf |= 0x04 # RS = 0, RW = 0, EN = 1
BUS.write_byte(LCD_ADDR ,buf)
time.sleep(0.002)
buf &= 0xFB # Make EN = 0
BUS.write_byte(LCD_ADDR ,buf)
# Send bit3-0 secondly
buf = (comm & 0x0F) << 4
buf |= 0x04 # RS = 0, RW = 0, EN = 1
BUS.write_byte(LCD_ADDR ,buf)
time.sleep(0.002)
buf &= 0xFB # Make EN = 0
BUS.write_byte(LCD_ADDR ,buf)
def send_data(data):
# Send bit7-4 firstly
buf = data & 0xF0
buf |= 0x05 # RS = 1, RW = 0, EN = 1
BUS.write_byte(LCD_ADDR ,buf)
time.sleep(0.002)
buf &= 0xFB # Make EN = 0
BUS.write_byte(LCD_ADDR ,buf)
# Send bit3-0 secondly
buf = (data & 0x0F) << 4
buf |= 0x05 # RS = 1, RW = 0, EN = 1
BUS.write_byte(LCD_ADDR ,buf)
time.sleep(0.002)
buf &= 0xFB # Make EN = 0
BUS.write_byte(LCD_ADDR ,buf)
def init_lcd():
try:
send_command(0x33) # Must initialize to 8-line mode at first
time.sleep(0.005)
send_command(0x32) # Then initialize to 4-line mode
time.sleep(0.005)
send_command(0x28) # 2 Lines & 5*7 dots
time.sleep(0.005)
send_command(0x0C) # Enable display without cursor
time.sleep(0.005)
send_command(0x01) # Clear Screen
except:
return False
else:
return True
def clear_lcd():
send_command(0x01) # Clear Screen
def print_lcd(x, y, str):
if x < 0:
x = 0
if x > 15:
x = 15
if y <0:
y = 0
if y > 1:
y = 1
# Move cursor
addr = 0x80 + 0x40 * y + x
send_command(addr)
for chr in str:
send_data(ord(chr))
if __name__ == '__main__':
init_lcd()
print_lcd(0, 0, 'Hello, world!')
print_lcd(0, 1, 'ucat.taobao.com')
我改写的C语言版#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <errno.h>
#include <string.h>
#include <time.h>
#include <wiringPi.h>
#include <lcd.h>
int xio;
void send_command(int comm)
{
// Send bit7-4 firstly
int buf;
buf = comm & 0xF0;
buf |= 0x04; // RS = 0, RW = 0, EN = 1
wiringPiI2CWrite(xio,buf);
usleep(2000);
buf &= 0xFB; // Make EN = 0
wiringPiI2CWrite(xio,buf);
// Send bit3-0 secondly
buf = (comm & 0x0F) << 4;
buf |= 0x04; // RS = 0, RW = 0, EN = 1
wiringPiI2CWrite(xio,buf);
usleep(2000);
buf &= 0xFB; // Make EN = 0
wiringPiI2CWrite(xio,buf);
}
void send_data(data)
{
// Send bit7-4 firstly
int buf;
buf = data & 0xF0;
buf |= 0x05;// # RS = 1, RW = 0, EN = 1
wiringPiI2CWrite(xio,buf);
usleep(2000);
buf &= 0xFB;// # Make EN = 0
wiringPiI2CWrite(xio,buf);
// Send bit3-0 secondly
buf = (data & 0x0F) << 4;
buf |= 0x05;// # RS = 1, RW = 0, EN = 1
wiringPiI2CWrite(xio,buf);
usleep(2000);
buf &= 0xFB;// # Make EN = 0
wiringPiI2CWrite(xio,buf);
}
void init_lcd(void)
{
send_command(0x33);// # Must initialize to 8-line mode at first
usleep(5000);
send_command(0x32);// # Then initialize to 4-line mode
usleep(5000);
send_command(0x28);// # 2 Lines & 5*7 dots
usleep(5000);
send_command(0x0C);// # Enable display without cursor
usleep(5000);
send_command(0x01);// # Clear Screen
}
void print_lcd(int x, int y, char* str)
{
int addr;
if( x < 0)
x = 0;
if(x > 15)
x = 15;
if(y <0)
y = 0;
if(y > 1)
y = 1;
//# Move cursor
addr = 0x80 + 0x40 * y + x;
send_command(addr);
while(*str)
send_data(*str++);
}
int main (void)
{
struct tm *t ;
time_t tim ;
char buf ;
printf ("Raspberry Pi LCD test program\n") ;
xio = wiringPiI2CSetup (0x27);
if (xio < 0){
fprintf (stderr, "xio: Unable to initialise I2C: %s\n", strerror (errno));
return 1;
}
wiringPiI2CWriteReg8 (xio, 0x0a, 0x84) ;// IOCON - set BANK bit
wiringPiI2CWriteReg8 (xio, 0x05, 0x84) ;// IOCON - set ODR in bank 0
wiringPiI2CWriteReg8 (xio, 0x00, 0x00) ;// Port A -> Outputs
init_lcd();
while(1)
{
tim = time (NULL) ;
t = localtime (&tim) ;
sprintf (buf, " %02d:%02d:%02d ", t->tm_hour, t->tm_min, t->tm_sec) ;
print_lcd(0, 0, "ucat.taobao.com");
print_lcd (0, 1, buf) ;
}
return 0;
}
C 版运行效果
这几天天冷，我想做一个即时显示温度的设备，温度传感器方面以前已测试过了，就是这显示折腾了我好久。
python版的代码，我忘记出处了，好像也是这个论坛的。 大家看图上的接线，是不是好清爽啊？:P 赞一个，好东西 ....浪费电，5V 1A5瓦的时钟、、、、不过喜欢就好 编程完全看不懂，过年这段时间打算买几本书补一补 好酷啊 :lol 楼主，我想做一个uart的部分，但是搜不到什么资料，你有相关资料吗？1058306167@qq.com 好东西，谢谢分享
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