[Raspberry Pi]PCF8574扩展IO口实现I2C转LCD1602（C语言）

dvd1478

上次很偶然的秒到了I2C转LCD1602，
秒到IIC控制LCD1602转换版到货啦！
https://www.cirmall.com/bbs/forum ... 45305&fromuid=23447

[Raspberry Pi]PCF8574扩展IO口实现I2C转LCD1602（Python）
https://www.cirmall.com/bbs/foru ... 9&fromuid=23447

这次同样也是做扩展，不过是利用wiringPi IO扩展映射功能的实现，实现起来更加的方便
代码如下

#include <wiringPi.h>
#include <pcf8574.h>
#include <lcd.h>
#include <stdio.h>
#include <stdlib.h>
//扩展PCF8574 起始PIN地址
// PCF8754 64+8
#define AF_BASE 64
#define AF_RS (AF_BASE + 0)
#define AF_RW (AF_BASE + 1)
#define AF_E (AF_BASE + 2)
#define AF_LED (AF_BASE + 3)
#define AF_DB4 (AF_BASE + 4)
#define AF_DB5 (AF_BASE + 5)
#define AF_DB6 (AF_BASE + 6)
#define AF_DB7 (AF_BASE + 7)
// Global lcd handle:
static int lcdHandle;
int main(void)
{
int i;
int count;
//wiringPi初始化
wiringPiSetup();
//PCF8754 初始化，此时 PCF8754 的I2C 地址为 0x27
pcf8574Setup(AF_BASE,0x27);
lcdHandle = lcdInit (2, 16, 4, AF_RS, AF_E, AF_DB4,AF_DB5,AF_DB6,AF_DB7, 0,0,0,0) ;
if (lcdHandle < 0)
{
fprintf (stderr, "lcdInit failed\n") ;
exit (EXIT_FAILURE) ;
}
for(i=0;i<8;i++)
pinMode(AF_BASE+i,OUTPUT); //将拓展出的IO口全部置为输出模式
digitalWrite(AF_LED,1); //将107引脚置为高电平，点亮LCD背光灯
digitalWrite(AF_RW,0); //将R/W置为低电平，将LCD设置为写入状态
printf ("Raspberry Pi - PCF8754 Test\n");
lcdHome(lcdHandle); //将LCD的光标归位
lcdClear(lcdHandle); //清屏
lcdPosition (lcdHandle, 0, 0) ;
lcdPuts (lcdHandle, " QQ1696933323 ") ;
lcdPosition (lcdHandle, 0, 1) ;
//lcdPuts (lcdHandle, " Standard LCD ") ;
FILE *fp;
char temp_char[15]; //树莓派温度
char Total[20]; //总内存量
char Free[20]; //空闲内存量
while(1)
{
//lcdPosition (lcdHandle, 15, 1) ;
//lcdPrintf(lcdHandle,"%d",count++); //自动循环加1
//delay(1000);
fp=fopen("/sys/class/thermal/thermal_zone0/temp","r"); //读取树莓派温度
fgets(temp_char,9,fp);
float Temp;
Temp=atof(temp_char)/1000;
lcdPosition (lcdHandle, 0, 1);
lcdPrintf (lcdHandle, "%3.1fC", Temp) ;
fclose(fp);
fp=fopen("/proc/meminfo","r"); //读取内存信息
fgets(Total,19,fp);
fgets(Total,4,fp);
fgets(Free,9,fp);
fgets(Free,19,fp);
fgets(Free,4,fp);
lcdPosition (lcdHandle, 7, 1);
lcdPrintf (lcdHandle, "%3d/%3dMB", atoi(Free),atoi(Total)) ;
fclose(fp);
delay(1000);
//sleep(1);
}
return 0;
}