stm32f103 读tmp275温度传感器读不出温度希望做过的解答一下

lipengliang0335 · 发表于 2018-11-2 22:54:24

tmp275 地址是0x98,
#include "iic.h"

void IIC_Delay(void)
{
  delay_us(2);
}
void IIC_Init()
{
GPIO_InitTypeDef  GPIO_InitStruct;
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE );

GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStruct);

GPIO_SetBits(GPIOA,GPIO_Pin_6|GPIO_Pin_7);
}

void IIC_Start()
{
  SDA_OUT();
IIC_SCL = 1;
IIC_SDA = 1;
IIC_Delay();
IIC_SDA = 0;
IIC_Delay();
IIC_SCL = 0;

}

void IIC_Stop()
{
  SDA_OUT();
IIC_SCL = 0;
IIC_SDA = 0;
IIC_Delay();
IIC_SCL = 1;
IIC_SDA = 1;
IIC_Delay();

}
u8 IIC_Wait_Ack()
{
uint8_t Errtime;
SDA_IN();
   IIC_SDA = 1;IIC_Delay(); //êí·Åêy¾Y×üÏß
   IIC_SCL = 1;IIC_Delay(); //êí·ÅμØÖ·×üÏß
   while(IIC_SDA)
   {
   Errtime++;
   if(Errtime>200)
   {
   IIC_Stop();
   return 1;
   }

   }
   IIC_SCL = 0;
return 0;
}

void IIC_Send_Ack()
{
IIC_SCL = 0;
  SDA_OUT();
  IIC_SDA = 0;
IIC_Delay();
IIC_SCL = 1;
IIC_Delay();
IIC_SCL = 0;
IIC_Delay();
}

void IIC_Send_Nack()
{
IIC_SCL = 0;
  SDA_OUT();
  IIC_SDA = 1;
IIC_Delay();
IIC_SCL = 1;
IIC_Delay();
IIC_SCL = 0;
IIC_Delay();
}

void IIC_Write_Byte(u8 data)
{
  uint8_t i;
SDA_OUT();
IIC_SCL = 0;
for(i=0;i<8;i++)
{
   IIC_SDA = (data&0x80)>>7;
data<<=1;
IIC_Delay();
IIC_SCL = 1;
IIC_Delay();
IIC_SCL = 0;
IIC_Delay();
}

}

u8 IIC_Read_Byte(u8 ack)
{
  uint8_t i,receive;
SDA_IN();

IIC_Delay();
for(i=0;i<8;i++)
{
   IIC_SCL = 0;
IIC_Delay();
IIC_SCL = 1;
receive<<=1;
if(IIC_SDA)
receive++;
   IIC_Delay();
}
if(!ack)
IIC_Send_Nack();
else
IIC_Send_Ack();

return receive;
}

#include "tmp275.h"
#include "iic.h"

void TMP275_Init()
{
  //IIC_Init();
IIC_Start();
IIC_Write_Byte(0x98);
IIC_Wait_Ack();
IIC_Write_Byte(0x01);
IIC_Wait_Ack();
IIC_Start();
IIC_Write_Byte(0xFE);
IIC_Wait_Ack();
  IIC_Stop();
}

void TMP275_Write_Byte(u8 reg,u16 data)
{
u8 data_H,data_L;
data_H = (u8)data>>8;
data_L = (u8)data;
  IIC_Start();
IIC_Write_Byte(0x98);
IIC_Wait_Ack();
IIC_Write_Byte(0x00);
IIC_Wait_Ack();
IIC_Write_Byte(data_H);
IIC_Wait_Ack();
IIC_Write_Byte(data_L);
IIC_Wait_Ack();
  IIC_Stop();
}

u16 TMP275_Read_Byte()
{
u8 data_H,data_L;
  u16 temp = 0;
IIC_Start();
IIC_Write_Byte(0x98);
IIC_Wait_Ack();
IIC_Write_Byte(0x00);
IIC_Wait_Ack();
IIC_Start();
IIC_Write_Byte(0x99);
IIC_Wait_Ack();
data_H = IIC_Read_Byte(1);
data_L = IIC_Read_Byte(0);
temp = (((u16)data_H)<<8|data_L)>>4;
IIC_Stop();

return temp;

}

#include "pwm.h"
#include "delay.h"
#include "usart1.h"
#include "stm32f10x.h"
#include "tmp275.h"

float data;
u16 temp;
int main()
{
  //u16 led0pwmval=0;
//u8 dir=1;
  //TIME3_PWM_Init(999,7199);
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
USART1_Init(115200);
delay_init();
while(1)
{
u16 len,t;
//delay_ms(10);
//if(dir)led0pwmval++;
//else led0pwmval--;

//if(led0pwmval>300)dir=0;
//if(led0pwmval==0)dir=1;
//TIM_SetCompare3(TIM3,300);
//TIM_SetCompare4(TIM3,500);
delay_ms(1000);
temp = TMP275_Read_Byte();
printf("%d\r\n",temp);
if((temp&0x80)!=0)
{
   temp=~(temp-1);
data = 0.625*temp;
   printf("-%.1f\r\n",data);
}
else
{
   data = 0.625*temp;
   printf("%.1f\r\n",data);

}

//data = 0.625*TMP275_Read_Byte(00);
//data=(data/16.0);
//printf("%f\r\n",data);
if(USART1_RX_STA&0X8000)
{
   len = USART1_RX_STA&0x3fff;
printf("Äã·￠ËíμÄÏûÏ￠Îa:\r\n\r\n");
for(t=0;t<len;t++)
{
   USART_SendData(USART1,USART1_RX_BUF[t]); //·￠Ëíêy¾Y
   while(USART_GetFlagStatus(USART1,USART_FLAG_TC)!=SET); //μè′y·￠Ëí½áêø
}
   printf("\r\n");
USART1_RX_STA =0;
}
}
}

正点原子 · 发表于 2018-11-3 02:41:36

继续努力

hwb_dream · 发表于 2018-11-3 08:54:35

我想问一下，你的控制端口是PB6、PB7还是PA6、PA7，对应时钟或引脚都没配置对怎么能行
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE );

      GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_PP;
      GPIO_InitStruct.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7;
      GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_Init(GPIOA, &GPIO_InitStruct);

      GPIO_SetBits(GPIOA,GPIO_Pin_6|GPIO_Pin_7);