【单片机】用iic做电池充放电
iic.c
#include
#include "./lcd/lcd.h"
#include "./delay/delay.h"
sbit SCL = P2^2;
sbit SDA = P2^3;
bit ack;
/*
================
功能：起始信号
================
*/
void iic_start()
{
SDA = 1;
SCL = 1;
delay_us(1);
SDA = 0;
delay_us(1);
SCL = 0;
}
/*
================
功能：终止信号
================
*/
void iic_stop()
{
SDA = 0;
SCL = 1;
delay_us(1);
SDA = 1;
delay_us(1);
SCL = 0;
}
/*
====================
功能：发送一个字节
====================
*/
bit iic_send_byte(unsigned char byte)
{
unsigned char i;
for(i = 0; i < 8; i++)
{
SDA = byte & 0x80;
SCL = 1;
delay_us(1);
SCL = 0;
byte <<= 1;
}
SCL = 1;
SDA = 1;
delay_us(1);
if(0 == SDA)
{
ack = 1;
}
else
{
ack = 0;
}
SCL = 0;
return ack;
}
/*
====================
功能：接收一个字节
====================
*/
unsigned char iic_receive_byte()
{
unsigned char i;
unsigned char a;
unsigned char temp = 0;
SDA = 1;
for(i = 0; i < 8; i++)
{
SCL = 0;
delay_us(1);
SCL = 1;
if(SDA)
{
a = 1;
}
else
{
a = 0;
}
temp |= (a << (7 - i));
delay_us(1);
}
SCL = 0;
return temp;
}
#if 0
/*
====================
功能：应答
====================
*/
void iic_ack()
{
SDA = 0;
SCL = 1;
delay_us(1);
SCL = 0;
}
#endif
/*
====================
功能：无应答
====================
*/
void iic_noack()
{
SDA = 1;
SCL = 1;
delay_us(1);
SCL = 0;
}
#if 0
/*
====================
功能：发送字符串
====================
*/
bit iic_send_str(unsigned char sla, unsigned char suba, unsigned char *str, unsigned char len)
{
unsigned char i;
iic_start();
iic_send_byte(sla);
if(0 == ack)
{
return 0;
}
iic_send_byte(suba);
if(0 == ack)
{
return 0;
}
for(i = 0; i < len; i++)
{
iic_send_byte(*str);
delay_us(1);
if(0 == ack)
{
return 0;
}
str++;
}
iic_stop();
return 1;
}
/*
====================
功能：接收字符串
====================
*/
bit iic_receive_str(unsigned char sla, unsigned char suba, unsigned char *str, unsigned char len)
{
unsigned char i;
iic_start();
iic_send_byte(sla);
if(0 == ack)
{
return 0;
}
iic_send_byte(suba);
if(0 == ack)
{
return 0;
}
iic_start();
iic_send_byte(sla + 1);
if(0 == ack)
{
return 0;
}
for(i = 0; i < len - 1; i++)
{
*str = iic_receive_byte();
iic_ack();
str++;
}
*str = iic_receive_byte();
iic_noack();
iic_stop();
return 1;
}
#endif
unsigned char AD_read()
{
unsigned char temp;
iic_start();
iic_send_byte(0x90);
if(0 == ack)
{
return 0;
}
iic_send_byte(0x40); //设置通道和工作方式
if(0 == ack)
{
return 0;
}
iic_start();
iic_send_byte(0x90 + 1);
if(0 == ack)
{
return 0;
}
temp = iic_receive_byte();
iic_noack();
iic_stop();
return temp;
}
void main()
{
unsigned char test;
unsigned char n;
float per;
float number;
lcd_init();
while(1)
{
test = AD_read();
delay_ms(20);
number = (float)test / 255 * 5;
n = (float)test / 255 * 7;
per = (float)test * 100 / 255;
lcd_dis_power(n);
lcd_write_byte(1,3,(unsigned char)(number) % 10 + 0x30);
lcd_write_byte(1,4,'.');
lcd_write_byte(1,5,(unsigned char)(number * 10) % 10 + 0x30);
lcd_write_byte(1,6,(int)(number * 100) % 10 + 0x30);
lcd_write_byte(2,1,(unsigned char)(per) / 100 + 0x30);
lcd_write_byte(2,2,(unsigned char)(per) % 100 / 10 + 0x30);
lcd_write_byte(2,3,(unsigned char)(per) % 10 + 0x30);
lcd_write_byte(2,4,'%');
delay_ms(5);
}
}
lcd.c
#include
#include "../delay/delay.h"
#include "lcd.h"
unsigned char disdata[7][8] =
{
0x0e,0x1b,0x11,0x11,0x11,0x11,0x11,0x1f,
0x0e,0x1b,0x11,0x11,0x11,0x11,0x1f,0x1f,
0x0e,0x1b,0x11,0x11,0x11,0x1f,0x1f,0x1f,
0x0e,0x1b,0x11,0x11,0x1f,0x1f,0x1f,0x1f,
0x0e,0x1b,0x11,0x1f,0x1f,0x1f,0x1f,0x1f,
0x0e,0x1b,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,
0x0e,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,
};
void lcd_write(unsigned char byte, unsigned char flag)
{
if(flag)
{
RS = 1;
}
else
{
RS = 0;
}
RW = 0;
E = 1;
LCDPORT = byte;
delay_us(5);
E = 0;
}
void lcd_init()
{
delay_ms(15);
lcd_write(0x38,LCD_WRITE_COM);
delay_ms(5);
lcd_write(0x38,LCD_WRITE_COM);
delay_ms(5);
lcd_write(0x38,LCD_WRITE_COM);
delay_ms(5);
lcd_write(0x38,LCD_WRITE_COM);
delay_ms(5);
lcd_write(0x08,LCD_WRITE_COM);
delay_ms(5);
lcd_write(0x01,LCD_WRITE_COM);
delay_ms(5);
lcd_write(0x06,LCD_WRITE_COM);
delay_ms(5);
lcd_write(0x0c,LCD_WRITE_COM);
delay_ms(5);
}
#if 0
void lcd_dis_str(unsigned char x, unsigned char y, unsigned char *disdata)
{
unsigned char add;
if(((0 == x) || (x > 2)) || ((0 == y) || (y > 16)))
{
return ;
}
add = 0x80 + (x - 1) * 0x40 + (y - 1);
lcd_write(add,LCD_WRITE_COM);
while(*disdata != '\0')
{
lcd_write(*disdata,LCD_WRITE_DATA);
disdata++;
}
}
#endif
void lcd_write_byte(unsigned char x, unsigned char y, unsigned char byte)
{
unsigned char add;
if(((0 == x) || (x > 2)) || ((0 == y) || (y > 16)))
{
return ;
}
add = 0x80 + (x - 1) * 0x40 + (y - 1);
lcd_write(add,LCD_WRITE_COM);
lcd_write(byte,LCD_WRITE_DATA);
}
void lcd_dis_power(unsigned char num)
{
unsigned char i;
unsigned char j;
for(i = 0; i < num; i++)
{
lcd_write(0x40,LCD_WRITE_COM);
for(j = 0; j < 8; j++)
{
lcd_write(disdata[i][j],LCD_WRITE_DATA);
}
lcd_write(0x80,LCD_WRITE_COM);
lcd_write(0x00,LCD_WRITE_DATA);
}
}
delay.c
/*
=============================
延时毫秒：time = 2 * t + 12
=============================
*/
void delay_us(unsigned char t)
{
while(--t);
}
/*
=================
功能：延时微秒
=================
*/
void delay_ms(unsigned char t)
{
while(t--)
{
delay_us(245);
delay_us(245);
}
}
/*
=================
功能：延时秒
=================
*/
#if 0
void delay_s(unsigned char t)
{
while (t--)
{
delay_ms(200);
delay_ms(200);
delay_ms(200);
delay_ms(200);
delay_ms(200);
}
}
#endiflcd.h
#ifndef _LCD_H_
#define _LCD_H_
#define LCDPORT P0
#define LCD_WRITE_DATA 1
#define LCD_WRITE_COM 0
sbit RS = P2^4;
sbit RW = P2^5;
sbit E = P2^6;
extern void lcd_write(unsigned char byte, unsigned char flag);
extern void lcd_init();
extern void lcd_dis_str(unsigned char x, unsigned char y, unsigned char *disdata);
extern void lcd_dis_byte(unsigned char x, unsigned char y, unsigned char byte);
extern void lcd_write_byte(unsigned char x, unsigned char y, unsigned char byte);
extern void lcd_dis_power(unsigned char num);
#endif
delay.h
#ifndef _DELAY_H_
#define _DELAY_H_
extern void delay_us(unsigned char t);
extern void delay_ms(unsigned char t);
extern void delay_s(unsigned char t);
#endif