Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->/******** STM8S-Discovery DS18B20 Test ********
* 版本.........: 1.0
* 目标.........: STM8S105C6T6
* 文件名.......: main.c
* 开发环境.....: IAR for STM8 V1.1
***********************************************/
#include
#include
#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);
}
}
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