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SPI Communication on Seeed Studio XIAO SAMD21

SPI Communication Interface

Hardware

Materials required

• Seeeduino XIAO x 1

• Grove-High Precision pressure Sensor

• Type-C cable x1

Hardware Connection

• Step 1. Grove-High Precision pressure Sensor's CSK is connected to Seeeduino XIAO's SCK.

• Step 2. Sensor's CS is connected to Seeeduino XIAO's D3.

• Step 3. Sensor's SDO is connected to Seeeduino XIAO's MISO.

• Step 4. Sensor's SDI is connected to Seeeduino XIAO's MOSI.

• Step 5. Sensor's GND is connected to Seeeduino XIAO's GND.

• Step 6. Sensor's 3V3 is connected to Seeeduino XIAO's 3.3V.

• Step 7. Connect Seeeduino XIAO to PC via a Type-C cable.

Software

Attention

If this is the first time you work with Arduino, we strongly recommend you to see Getting Started with Arduino before the start.

• Step 1. Download the DPS310-Pressure-Sensor Library from Github.

• Step 2. Refer to How to install library to install library for Arduino.

• Step 3. Copy the code into Arduino IDE and upload.

  #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. Click Tools > Serial Monitor , or press Ctrl+Shift+M together, open the serial monitor after uploading successfully, the output appears as follows: