使用 XIAO SAMD21 学习SPI 通讯

SPI通讯接口

硬件

所需材料

硬件连接

Step 1. Grove-High Precision传感器的 CSK 连接到 Seeed Studio XIAO 的 SCK。
Step 2. 传感器的 CS 连接到 Seeed Studio XIAO 的 D3。
Step 3. 传感器的 SDO 连接到 Seeed Studio XIAO 的 MISO。
Step 4. 传感器的 SDI 连接到 Seeed Studio XIAO 的 MOSI。
Step 5. 传感器的 GND 连接到 Seeed Studio XIAO 的 GND。
Step 6. 传感器的 3V3 连接到 Seeed Studio XIAO 的 3.3V。
Step 7. 通过 Type-C 数据线将 Seeed Studio XIAO 连接到 PC。

软件

note

如果这是您第一次使用 Arduino，我们强烈建议您在开始之前先阅读Arduino 入门。

Step 1. 从 Github 下载 DPS310-Pressure-Sensor 库。
Step 2. 请参阅如何安装库来安装Arduino的库。
Step 3. 将代码复制到 Arduino IDE 中并上传。

#include <Dps310.h>

// Dps310 Opject
Dps310 Dps310PressureSensor = Dps310();

void setup()
{
  //pin number of your slave select line
  //XMC2GO
  int16_t pin_cs = 3;
  //for XMC 1100 Bootkit  & XMC4700 Relax Kit uncomment the following line
  //int16_t pin_cs = 10;

  Serial.begin(9600);
  while (!Serial);


  //Call begin to initialize Dps310
  //The parameter pin_nr is the number of the CS pin on your Microcontroller
  Dps310PressureSensor.begin(SPI, pin_cs);

  //temperature measure rate (value from 0 to 7)
  //2^temp_mr temperature measurement results per second
  int16_t temp_mr = 2;
  //temperature oversampling rate (value from 0 to 7)
  //2^temp_osr internal temperature measurements per result
  //A higher value increases precision
  int16_t temp_osr = 2;
  //pressure measure rate (value from 0 to 7)
  //2^prs_mr pressure measurement results per second
  int16_t prs_mr = 2;
  //pressure oversampling rate (value from 0 to 7)
  //2^prs_osr internal pressure measurements per result
  //A higher value increases precision
  int16_t prs_osr = 2;
  //startMeasureBothCont enables background mode
  //temperature and pressure ar measured automatically
  //High precision and hgh measure rates at the same time are not available.
  //Consult Datasheet (or trial and error) for more information
  int16_t ret = Dps310PressureSensor.startMeasureBothCont(temp_mr, temp_osr, prs_mr, prs_osr);
  //Use one of the commented lines below instead to measure only temperature or pressure
  //int16_t ret = Dps310PressureSensor.startMeasureTempCont(temp_mr, temp_osr);
  //int16_t ret = Dps310PressureSensor.startMeasurePressureCont(prs_mr, prs_osr);


  if (ret != 0)
  {
    Serial.print("Init FAILED! ret = ");
    Serial.println(ret);
  }
  else
  {
    Serial.println("Init complete!");
  }
}



void loop()
{
  uint8_t pressureCount = 20;
  float pressure[pressureCount];
  uint8_t temperatureCount = 20;
  float temperature[temperatureCount];

  //This function writes the results of continuous measurements to the arrays given as parameters
  //The parameters temperatureCount and pressureCount should hold the sizes of the arrays temperature and pressure when the function is called
  //After the end of the function, temperatureCount and pressureCount hold the numbers of values written to the arrays
  //Note: The Dps310 cannot save more than 32 results. When its result buffer is full, it won't save any new measurement results
  int16_t ret = Dps310PressureSensor.getContResults(temperature, temperatureCount, pressure, pressureCount);

  if (ret != 0)
  {
    Serial.println();
    Serial.println();
    Serial.print("FAIL! ret = ");
    Serial.println(ret);
  }
  else
  {
    Serial.println();
    Serial.println();
    Serial.print(temperatureCount);
    Serial.println(" temperature values found: ");
    for (int16_t i = 0; i < temperatureCount; i++)
    {
      Serial.print(temperature[i]);
      Serial.println(" degrees of Celsius");
    }

    Serial.println();
    Serial.print(pressureCount);
    Serial.println(" pressure values found: ");
    for (int16_t i = 0; i < pressureCount; i++)
    {
      Serial.print(pressure[i]);
      Serial.println(" Pascal");
    }
  }

  //Wait some time, so that the Dps310 can refill its buffer
  delay(10000);
}

Step 4. 点击Tools > Serial Monitor , 或者同时按下 Ctrl+Shift+M ，上传成功后打开串口监视器，输出如下：

pir

SPI通讯接口​

硬件​

软件​

SPI通讯接口

硬件

软件