【转】STM8S-Discovery DS18B20程序

只看该作者 · 2016-9-20 16:19

/******** STM8S-Discovery DS18B20 Test ********
* 版本.........: 1.0
* 作者.........: 陈利栋
* 目标.........: STM8S105C6T6
* 文件名.......: main.c
* 开发环境.....: IAR for STM8 V1.1
* 创建时间.....: 2010.09.10
* 最后修改.....: 2010.09.10
***********************************************/

#include <iostm8s105c6.h>
#include <stdio.h>

#define BAUD_RATE    9600       //波特率
#define F_MASTER    16000000    //主频率

#define DS18B20_DQ_OUT       PG_DDR_DDR0 = 1 //输出
#define DS18B20_DQ_IN          PG_DDR_DDR0 = 0 //输入
#define DS18B20_DQ_HIGH       PG_ODR_ODR0 = 1 //拉高
#define DS18B20_DQ_LOW       PG_ODR_ODR0 = 0 //拉低
#define DS18B20_DQ_PULL_UP    PG_CR1_C10  = 1 //上拉
#define DS18B20_DQ_FLOATING    PG_CR1_C10  = 0 //浮空
#define DS18B20_DQ_PUSH_PULL PG_CR1_C10  = 1 //推挽
#define DS18B20_DQ_OPEN_DRAIN PG_CR1_C10  = 0 //开漏
#define DS18B20_DQ_VALUE       PG_IDR_IDR0    //DQ值

//串口配置
//数据位:8
//停止位:1
//校验位:None
void UART_Init(void)
{
UART2_CR2_TEN = 1;
UART2_CR2_REN = 1;
UART2_CR2_RIEN = 1;
UART2_BRR2 = ((unsigned char)((F_MASTER / BAUD_RATE) & 0x0f)) + (((unsigned char)((F_MASTER / BAUD_RATE) >> 8)) & 0xf0);
UART2_BRR1 = ((unsigned char)((F_MASTER / BAUD_RATE) >> 4));
}

void UART_TxByte(unsigned char _data)
{
while (UART2_SR_TXE == 0);
UART2_DR = _data;
}

int putchar(int c)
{
UART_TxByte(c);
return c;
}

void _delay_us(unsigned int i)
{
i *= 3;
while(--i);
}

void _delay_ms(unsigned int i)
{
while(i--)
{
      _delay_us(1000);
}
}

void DS18B20_Init(void)
{
DS18B20_DQ_OUT;
DS18B20_DQ_PUSH_PULL;
DS18B20_DQ_HIGH;
_delay_us(10);
DS18B20_DQ_LOW;
_delay_us(600);    //复位脉冲

DS18B20_DQ_IN;
DS18B20_DQ_PULL_UP;
_delay_us(100);
while(DS18B20_DQ_VALUE == 1);
_delay_us(400);
}

void DS18B20_WriteByte(unsigned char _data)
{
unsigned char i = 0;

DS18B20_DQ_OUT;
for (i = 0; i < 8; i++)
{
      DS18B20_DQ_LOW;
      _delay_us(2);
      if (_data & 0x01)
      {
         DS18B20_DQ_HIGH;
      }
      _data >>= 1;
      _delay_us(60);
      DS18B20_DQ_HIGH;
}
}

unsigned char DS18B20_ReadByte(void)
{
unsigned char i = 0, _data = 0;

for (i = 0; i < 8; i++)
{
      DS18B20_DQ_OUT;
      DS18B20_DQ_LOW;
      _delay_us(5);
      _data >>= 1;
      DS18B20_DQ_HIGH;
      DS18B20_DQ_IN;
      if (DS18B20_DQ_VALUE)
      {
         _data |= 0x80;
      }
      DS18B20_DQ_OUT;
      DS18B20_DQ_HIGH;
      _delay_us(60);
}

return _data;
}

float DS18B20_ReadTemperature(void)
{
unsigned char temp = 0;
float t = 0;

DS18B20_Init();
DS18B20_WriteByte(0xcc);
DS18B20_WriteByte(0x44);

DS18B20_Init();
DS18B20_WriteByte(0xcc);
DS18B20_WriteByte(0xbe);

temp = DS18B20_ReadByte();
t = (((temp & 0xf0) >> 4) + (temp & 0x07) * 0.125);
temp = DS18B20_ReadByte();
t += ((temp & 0x0f) << 4);

return t;
}

int main(void)
{
CLK_SWCR_SWEN = 1;
CLK_SWR = 0xB4; //HSE selected as master clock source

UART_Init();
printf("********* STM8S-Discovery DS18B20 Test *********\r\n");
printf("Build: %s  %s\r\n", __DATE__, __TIME__);

asm("rim");

while(1)
{
      _delay_ms(1000);
      printf("%.3f ", DS18B20_ReadTemperature());
}
}

#pragma vector = UART2_R_RXNE_vector
__interrupt void UART2_IRQHandler(void)
{
if (UART2_SR_RXNE == 1)
{
      UART_TxByte(UART2_DR);
}
}

只看该作者 · 2016-9-20 16:24

　好东西，值得学习。

只看该作者 · 2016-9-20 16:32

进来看看，解释的够详细

只看该作者 · 2016-9-20 16:41

_interrupt void UART2_IRQHandler(void) 一般中断方法都是这么定义的。

只看该作者 · 2016-9-20 16:47

代码很有借鉴价值，学习了

只看该作者 · 2016-9-20 16:52

不错，新手一枚，很喜欢