LCD12864基于ds18b20 显示温度曲线单片机源程序

ID:859233 · 发表于 2021-3-5 12:09

仿真原理图如下（proteus仿真工程文件可到本帖附件中下载）

单片机源程序如下:

#include "lcd12864.h"
#ifdef LCD12864_DEV_DRIVER
sbit DQ = DS18B20_DQ_PIN
static uint16_t clock_ticks = 0;
static bool_t second_flag = 0;
static uint8_t pos_x = 0;
static uint8_t pos_y = 0;
static uint8_t pos_x_befor = 0;
static uint8_t pos_y_befor = 0;
static idata int16_t temperature;
static idata float temp_display;
static idata uint8_t display_buf[8];
static void ds18b20_delay(uint16_t i)
{
while( i-- );
}
static bool_t ds18b20_reset(void) /* 初始化函数 */
{
uint8_t x = 0;
DQ = 1; //DQ复位
ds18b20_delay(8); //稍做延时
DQ = 0; //单片机将DQ拉低
ds18b20_delay(80); //精确延时大于 480us
DQ = 1; //拉高总线
ds18b20_delay(14);
x = DQ; //稍做延时后如果x=0则初始化成功 x=1则初始化失败
ds18b20_delay(20);
if(x == 0){
return TRUE;
}else{
return FALSE;
}
}
static uint8_t ds18b20_read_one_char(void)/* 读一个字节 */
{
uint8_t i=0;
uint8_t dat = 0;
for (i=8;i>0;i--){
DQ = 0; /* 给脉冲信号 */
dat>>=1;
DQ = 1; /* 给脉冲信号 */
if(DQ)
dat|=0x80;
ds18b20_delay(4);
}
return dat;
}
static uint8_t ds18b20_write_one_char(uint8_t dat)/* 写一个字节 */
{
uint8_t i=0;
for (i=8; i>0; i--){
DQ = 0;
DQ = dat&0x01;
ds18b20_delay(5);
DQ = 1;
dat>>=1;
}
return dat;
}
int16_t ds18b20_read_temperature(void)/* 读取温度, 返回的温度值 *10, 即一位小数 */
{
uint8_t a = 0;
uint8_t b = 0;
int16_t t = 0;
bool_t is_negative_temp = 0;
__disable_irq();
ds18b20_reset();
ds18b20_write_one_char(0xCC); /* 跳过读序号列号的操作 */
ds18b20_write_one_char(0x44); /* 启动温度转换 */
ds18b20_delay(100);
ds18b20_reset();
ds18b20_write_one_char(0xCC); /* 跳过读序号列号的操作 */
ds18b20_write_one_char(0xBE); /* 读取温度寄存器等（共可读9个寄存器）前两个就是温度 */
a = ds18b20_read_one_char();
b = ds18b20_read_one_char();
__enable_irq();
if( b > 0x7f ) /* 最高位为1 时温度是负 */
{
a = ~a + 1;
b = ~b;
is_negative_temp = 1;
}
t = a >> 4;
t += b << 4;
a = (a&0x0f)*10 >> 4;
t *= 10;
t += a;
if(is_negative_temp){
t = -t;
}
return t;
}
void ds18b20_init(void)
{
ds18b20_reset();
ds18b20_write_one_char(0xcc);//忽略ROM指令
ds18b20_write_one_char(0x4e);//写暂存器指令
ds18b20_write_one_char(0); //TH值未使用
ds18b20_write_one_char(0); //TL值未使用
ds18b20_write_one_char(0x3f);// 采用bit数。
//0x1f ： 0.5000°C 转换时间93.75ms
//0x3f ： 0.2000°C 转换时间187.5ms
//0x5f ： 0.1250°C 转换时间375ms
//0x7f ： 0.0625°C 转换时间750ms
ds18b20_read_temperature(); /* 第一次读取值错误,丢弃 */
}
static void draw_coord(void)/* 画坐标 */
{
pos_x = 0;
pos_y = 0;
pos_x_befor = 0;
pos_y_befor = 0;
lcd12864_clear_display(0);
lcd12864_draw_dotted_line(0,63, 0, 0);
lcd12864_draw_dotted_line(0,32,127,32);
lcd12864_draw_dotted_line(0, 63,127, 63);
lcd12864_show_string(0, 80, "T:0");
}
void Delay500ms() //@11.0592MHz
{
unsigned char i, j, k;
_nop_();
i = 4;
j = 129;
k = 119;
do
{
do
{
while (--k);
} while (--j);
} while (--i);
}
void main(void)
{
SCON = 0x50; /* 8位数据,可变波特率 */
TMOD &= 0x0f; /* 设定定时器1为16位自动重装方式 */
TMOD |= 0x20; /* 设定定时器1为16位自动重装方式 */
PCON = 0x00; /* 波特率不加倍 */
TH1 = 0xFD; /* 设定定时初值 */
TL1 = 0xFD; /* 设定定时初值 */
TR1 = 1; /* 启动定时器1 */
REN = 1; /* 使能接收 */
ES = 1; /* 打开串口中断 */
TMOD &= 0xF0; //设置定时器模式
TMOD |= 0x01; //设置定时器模式
TL0 = 0x00; //设置定时初值,50ms中断
TH0 = 0x4C; //设置定时初值
TF0 = 0; //清除TF0标志
TR0 = 1; //定时器0开始计时
ET0 = 1; //允许定时/计数器0中断
ds18b20_init();
lcd12864_init();
__enable_irq();
draw_coord();
second_flag = 1;
ds18b20_read_temperature();
Delay500ms();
ds18b20_read_temperature();
Delay500ms();
while(1){
if(second_flag == 1){
second_flag = 0;
if(pos_x == 128){
draw_coord();
}
temperature = ds18b20_read_temperature();
temp_display = temperature / 10.0;
sprintf(display_buf, "%.1f", temp_display);
lcd12864_show_string(0, 96, " ");
lcd12864_show_string(0, 96, display_buf);
if(temperature > 630){
temperature = 630;
}else if(temperature < 0){
temperature = 0;
}
pos_y = temperature / 10;
pos_y = 63 - pos_y;
if(pos_x == 0){
pos_x_befor = 0;
pos_y_befor = pos_y;
}
lcd12864_draw_line(pos_x_befor, pos_y_befor, pos_x, pos_y);
pos_x_befor = pos_x;
pos_y_befor = pos_y;
pos_x++;
}
}
}
void timer0() interrupt 1
{
TL0 = 0x00;//重新装载初值, 50ms中断
TH0 = 0x4c;
clock_ticks++;
if(clock_ticks == 20){
clock_ticks = 0;
second_flag = 1;
}
}
sbit RST = LCD12864_RST;
sbit E = LCD12864_EN;
sbit RW = LCD12864_RW;
sbit DI = LCD12864_DI;
sbit CS1 = LCD12864_CS1;
sbit CS2 = LCD12864_CS2;
#define LCDPORT P0
#define LCDSTARTROW 0xC0 /* 设置起始行指令 */
#define LCDPAGE 0xB8 /* 设置页指令 */
#define LCDLINE 0x40 /* 设置列指令 */
#define ASCII_CODE_12864_ELEMENT_NUM ( 67 )
extern ascii_12864 code ascii_code_12864[];
/*---------------------------------------------------------------------------*/
static bool_t lcd12864_is_busy(void)
{
uint8_t state = 0;
bool_t busy;
LCDPORT = 0xFF;
RW = 1;
DI = 0;
E = 1;
E = 0;
E = 1;/* E的下降沿，然后E持续拉高读才有效 */
state = LCDPORT;
E = 0;
busy = (bool_t)(state>>7);
return busy;
}
/*---------------------------------------------------------------------------*/
static void lcd12864_write_data(uint8_t ucData)
{
uint16_t timeout;
timeout = 0;
while(lcd12864_is_busy()){
timeout++;
if(timeout > 0xff){
break;
}
}
LCDPORT = 0xFF;
RW = 0;
DI = 1;
LCDPORT = ucData;
E = 1;
E = 0;
}
/*---------------------------------------------------------------------------*/
static void lcd12864_write_cmd(uint8_t ucCMD)
{
uint16_t timeout;
timeout = 0;
while(lcd12864_is_busy()){
timeout++;
if(timeout > 0xff){
break;
}
}
LCDPORT = 0xFF;
RW = 0;
DI = 0;
LCDPORT = ucCMD;
E = 1;
E = 0;
}
/*---------------------------------------------------------------------------*/
void lcd12864_init( void )
{
CS1 = 1;
CS2 = 1;
lcd12864_write_cmd(0x38); /* 8位形式，两行字符 */
lcd12864_write_cmd(0x0F); /* 开显示 */
lcd12864_write_cmd(0x01); /* 清屏 */
lcd12864_write_cmd(0x06); /* 画面不动，光标右移 */
lcd12864_write_cmd(LCDSTARTROW); /* 设置起始行 */
}
/*---------------------------------------------------------------------------*/
static void lcd12864_show_custom_row(uint8_t ucPage,uint8_t ucLine,uint8_t ucWidth,uint8_t *ucaRow)
{
uint8_t ucCount;
if(ucLine < 64){
CS1=1;
CS2=0;
lcd12864_write_cmd(LCDPAGE + ucPage);
lcd12864_write_cmd(LCDLINE + ucLine);
if( (ucLine + ucWidth) < 64 ){
for(ucCount = 0; ucCount < ucWidth; ucCount++){
lcd12864_write_data(*(ucaRow + ucCount));
}
}
else{
for(ucCount = 0; ucCount < (64 - ucLine); ucCount++){
lcd12864_write_data(*(ucaRow+ucCount));
}
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