為什么我的51單片機(jī)采集不到XGZP6869D壓力傳感器數(shù)據(jù)?

ID:1128777 · 發(fā)表于 2024-7-11 16:52

使用STC89C52單片機(jī)，傳感器為XGZP6869D，傳感器可以直接進(jìn)行IIC采集信息，現(xiàn)在我使用了串口把數(shù)據(jù)發(fā)送至串口助手，但是串口助手不顯示任何數(shù)據(jù)，傳感器數(shù)據(jù)采集部分使用了傳感器數(shù)據(jù)手冊(cè)中的示例程序。麻煩有大佬幫我看看我的問(wèn)題出現(xiàn)在哪里了？是不是我直接接了傳感器芯片，沒(méi)有接上拉電阻的原因？還是我的程序有問(wèn)題？或者其他的什么問(wèn)題？
接線：1腳SDA-->P1.7 7腳SCL-->P1.6 3腳VDD-->5V 5腳GND-->GND （傳感器-->51單片機(jī)）

代碼：
#include <reg52.h>
#include <math.h>
#include<stdio.h>
#define DELAY_TIME 600
#define TRUE 1
#define FALSE 0
#define uchar unsigned char
#define uint unsigned int

//----define IIC SCL, SDA port----
sbit SCL = P1 ^ 7;
sbit SDA = P1 ^ 6;

//----delay time_us----
void DELAY(uint t) {
      while (t != 0)
         t--;
}

//----IIC START CONDITION----
void I2C_Start(void) {
      SDA = 1; //SDA output high
      DELAY(DELAY_TIME);
      SCL = 1;
      DELAY(DELAY_TIME); //SCL output high
      SDA = 0;
      DELAY(DELAY_TIME);
      SCL = 0;
      DELAY(DELAY_TIME);
}

//----IIC STOP CONDITION----
void I2C_Stop(void) {
      SDA = 0; //SDA OUTPUT LOW
      DELAY(DELAY_TIME);
      SCL = 1;
      DELAY(DELAY_TIME);
      SDA = 1;
      DELAY(DELAY_TIME);
      SCL = 0; //SCL OUTPUT LOW
      DELAY(DELAY_TIME);
}

//----IIC SEND DATA "0"----
void SEND_0(void) {
      SDA = 0;
      DELAY(DELAY_TIME);
      SCL = 1;
      DELAY(DELAY_TIME);
      SCL = 0;
      DELAY(DELAY_TIME);
}

//----IIC SEND DATA "1"----
void SEND_1(void) {
      SDA = 1;
      DELAY(DELAY_TIME);
      SCL = 1;
      DELAY(DELAY_TIME);
      SCL = 0;
      DELAY(DELAY_TIME);
}

//----Check SLAVE's Acknowledge----
bit Check_Acknowledge(void) {
      SDA = 1;
      DELAY(DELAY_TIME);
      SCL = 1;
      DELAY(DELAY_TIME / 2);
      F0 = SDA;
      DELAY(DELAY_TIME / 2);
      SCL = 0;
      DELAY(DELAY_TIME);
      if (F0 == 1)
         return FALSE;
      return TRUE;
}

//----Write One Byte of Data----
void WriteI2CByte(uchar b) reentrant {
      char i;
      for (i = 0; i < 8; i++)
         if ((b << i) & 0x80)
            SEND_1();
         else
            SEND_0();
}

//----Read One Byte of Data----
uchar ReadI2CByte(void) reentrant {
      char b = 0, i;
      for (i = 0; i < 8; i++) {
         SDA = 1;
         DELAY(DELAY_TIME);
         SCL = 1;
         DELAY(DELAY_TIME);
         F0 = SDA;
         DELAY(DELAY_TIME);
         SCL = 0;
         if (F0 == 1) {
            b = b << 1;
            b = b | 0x01;
         } else
            b = b << 1;
      }
      return b;
}

//----write One Byte of Data,Data from MASTER to the SLAVER----
void Write_One_Byte(uchar addr, uchar thedata) { //Write "thedata" to the SLAVER's address of "addr"
      bit acktemp = 1;
      I2C_Start(); //IIC START
      WriteI2CByte(0x6D << 1 + 0); //IIC WRITE operation, SLAVER address bit: 0x6D
      acktemp = Check_Acknowledge(); //check the SLAVER
      WriteI2CByte(addr); //address
      acktemp = Check_Acknowledge();
      WriteI2CByte(thedata); //thedata
      acktemp = Check_Acknowledge();
      I2C_Stop(); //IIC STOP
}

//----Read One Byte of Data,Data from SLAVER to the MASTER----
uchar Read_One_Byte(uchar addr) {
      bit acktemp = 1;
      uchar mydata;
      I2C_Start();
      WriteI2CByte(0x6D << 1 + 0); //IIC WRITE operation, SLAVER address bit: 0x6D
      acktemp = Check_Acknowledge();
      WriteI2CByte(addr);
      acktemp = Check_Acknowledge();
      I2C_Start();
      WriteI2CByte(0x6D << 1 + 1); //IIC READ operation, SLAVER address bit: 0x6D
      acktemp = Check_Acknowledge();
      mydata = ReadI2CByte();
      I2C_Stop();
      return mydata;
}

//----Delay_ms----
void Delay_xms(uint x) {
      uint i, j;
      for (i = 0; i < x; i++)
         for (j = 0; j < 112; j++);
}

//----UART Initialization----
void UART_Init() {
      TMOD = 0x20; // Timer1 mode 2, 8-bit auto-reload
      TH1 = 0xFD;  // 9600 baud rate
      SCON = 0x50; // 8-bit data, 1 stop bit, REN enabled
      TR1 = 1;    // Start Timer1
}

//----UART Send Byte----
void UART_SendByte(uchar dat) {
      SBUF = dat; // Load data into SBUF
      while (!TI); // Wait for transmission to complete
      TI = 0;    // Clear TI flag
}

//----UART Send String----
void UART_SendString(uchar *str) {
      while (*str) {
         UART_SendByte(*str++);
      }
}

//----The main function----
void main(void) {
      uchar pressure_H, pressure_M, pressure_L, temperature_H, temperature_L;
      long int pressure_adc, temperature_adc;
      float pressure, temperature;
      uchar pressure_str[20], temperature_str[20];

      UART_Init(); // Initialize UART
      Delay_xms(1000); // delay 1000ms

      while (1) {
         Write_One_Byte(0x30, 0x0A);
         while ((Read_One_Byte(0x30) & 0x08) > 0);       //如果注釋掉這行，串口助手會(huì)顯示收到數(shù)據(jù)，但是都是0000
         Delay_xms(20); // delay 20ms

         pressure_H = Read_One_Byte(0x06);
         pressure_M = Read_One_Byte(0x07);
         pressure_L = Read_One_Byte(0x08);
         pressure_adc = pressure_H * 65536 + pressure_M * 256 + pressure_L;
         if (pressure_adc > 8388608)
            pressure = (pressure_adc - 16777216) / 64; // unit: Pa
         else
            pressure = pressure_adc / 64; // unit: Pa

         temperature_H = Read_One_Byte(0x09);
         temperature_L = Read_One_Byte(0x0A);
         temperature_adc = temperature_H * 256 + temperature_L;
         if (temperature_adc > 32768)
            temperature = (temperature_adc - 65536) / 256; // unit: Celsius
         else
            temperature = temperature_adc / 256; // unit: Celsius

         sprintf(pressure_str, "Pressure: %.2fPa\r\n", pressure);
         sprintf(temperature_str, "Temperature: %.2fC\r\n", temperature);

         UART_SendString(pressure_str);
         UART_SendString(temperature_str);

         Delay_xms(100); // delay 100ms
      }
}