Infineon XMC4700 User manual

Please read the Important Notice and Warnings at the end of this document
www.infineon.com page 1 of 31 2019-12-02
AN605
Using Infineon’s radar baseboard XMC4700 and
BGT24LTR11 radar shield with Arduino
Set-up guide
About this document
Scope and purpose
This application note provides a step-by-step guide to setting up Infineon’s 24 GHz Sense2GoL Pulse radar
system platform, which is made up of the radar baseboard XMC4700 and BGT24LTR11 radar shield, making up
the hardware and software for use with the Arduino platform. This guide will then go on to show an application
example to demonstrate some of the features of this radar system platform.
Intended audience
This document is intended for anyone interested in using Infineon’s 24 GHz radar system platform with the
Arduino platform.
Related documents
Additional information can be found in the supplementary documentation provided with the Sense2GoL Pulse
Kit in the Infineon Toolbox or from www.infineon.com/24GHz:
24 GHz Radar Tools and Development Environment User Manual
Sense2GoL Pulse Software User Manual
AN 598 –BGT24LTR11 Shield (Pulsed Doppler)
AN602 –Radar Baseboard XMC4700

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Table of contents
Table of contents
About this document....................................................................................................................... 1
Table of contents............................................................................................................................ 2
List of figures ................................................................................................................................. 3
List of tables .................................................................................................................................. 4
1Introduction .......................................................................................................................... 5
2Hardware modifications ......................................................................................................... 7
2.1Removal of resistors................................................................................................................................7
2.2 Selection of IOREF...................................................................................................................................7
2.3 ISCP header .............................................................................................................................................8
3Software set-up ..................................................................................................................... 9
3.1 Download and install Arduino IDE..........................................................................................................9
3.2 Install Infineon’s Arduino package .........................................................................................................9
3.3 Using Pulsed Doppler Radar Library.....................................................................................................12
3.4 Example sketches..................................................................................................................................16
3.4.1 Example 1: Radar_Pulsed_Doppler_LED ........................................................................................17
3.4.2 Example 2: RadarPulsedDoppler_Andee_RGB ...............................................................................20
4Author .................................................................................................................................28
5References ...........................................................................................................................29
Revision history.............................................................................................................................30

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List of figures
List of figures
Figure 1 Radar baseboard XMC4700 .................................................................................................................5
Figure 2 BGT24LTR11 radar shield....................................................................................................................6
Figure 3 Resistors to be removed for I2C communication ...............................................................................7
Figure 4 Jumper selection for IOREF ................................................................................................................8
Figure 5 Use SPI pins on P3 instead of P7 (ISCP)..............................................................................................8
Figure 6 Downloading the Arduino IDE.............................................................................................................9
Figure 7 Arduino IDE: File > Preferences.........................................................................................................10
Figure 8 Entering the location from which the package can be downloaded ..............................................10
Figure 9 Installing the XMC package...............................................................................................................11
Figure 10 Selecting XMC baseboard .................................................................................................................11
Figure 11 Including and using the Library in Arduino sketch ..........................................................................12
Figure 12 Declaring Pulsed Doppler Radar object ...........................................................................................12
Figure 13 Initializing hardware and parameters for Pulsed Doppler Radar....................................................13
Figure 14 Example for callback function definition .........................................................................................15
Figure 15 Call run() in main loop() ....................................................................................................................16
Figure 16 Accessing example sketches from this library .................................................................................17
Figure 17 Example sketch: Radar_Pulsed_Doppler_LED.................................................................................18
Figure 18 Compiling the sketch ........................................................................................................................18
Figure 19 Compilation successful.....................................................................................................................18
Figure 20 Attach the BGT24LTR11 radar shield to the radar baseboard XMC4700.........................................19
Figure 21 Connect USB cable to debug port ....................................................................................................19
Figure 22 Uploading code onto board..............................................................................................................20
Figure 23 Observe LED color change with motion ...........................................................................................20
Figure 24 Example sketch: RadarPulsedDopplerLED_Andee_RGB.................................................................21
Figure 25 Compiling the sketch ........................................................................................................................21
Figure 26 Compilation successful.....................................................................................................................22
Figure 27 Attach the BGT24LTR11 shield to the radar baseboard XMC4700...................................................22
Figure 28 Stacking the RGB LED lighting shield onto the radar baseboard XMC4700 ....................................23
Figure 29 Stacking the Annikken Andee U shield onto the set-up...................................................................23
Figure 30 Jumper wire connections on the Andee U .......................................................................................24
Figure 31 Connect the USB cable onto the debug port ...................................................................................24
Figure 32 Uploading the code onto the board .................................................................................................25
Figure 33 Application starts with white light....................................................................................................25
Figure 34 Andee app –scan for devices............................................................................................................25
Figure 35 Andee app –connect to device.........................................................................................................26
Figure 36 Andee app –GUI upon successful connection .................................................................................26
Figure 37 Changing pre-defined fast speed threshold.....................................................................................27

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List of tables
List of tables
Table 1 Configuration APIs.............................................................................................................................13
Table 2 Result APIs .........................................................................................................................................14
Table 3 Control APIs.......................................................................................................................................16
Table 4 Example sketches..............................................................................................................................17
Table 5 LED color based on motion for Example 1 .......................................................................................20
Table 6 LED behavior for Example 2..............................................................................................................27

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Introduction
1Introduction
The radar baseboard XMC4700, which is part of Infineon’s 24 GHz radar system platform, is designed with
headers compatible with Arduino (Figure 1) to ease prototyping works and integration with other Arduino
shields in the market to form a compelling application.
Figure 1 Radar baseboard XMC4700
Currently the 24 GHz radar system platform also offers a BGT24LTR11 radar shield (Figure 2), which is suitable
for various applications such as motion detection, presence sensing and proximity sensing.

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Introduction
Figure 2 BGT24LTR11 radar shield
For more details on the features of each board, please refer to their respective documents as mentioned on the
cover page of this document.

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Hardware modifications
2Hardwaremodifications
This section highlights some of the changes required to be made to the hardware before interfacing the radar
baseboard XMC4700 with other Arduino shields.
2.1 Removal of resistors
If I2C communication is intended to be used as the interface to the target Arduino shield, remove the following
resistors (Figure 3): R70, R71, R73, R74, R77 and R80.
Figure 3 Resistors to be removed for I2C communication
2.2 Selection of IOREF
XMC4700 operates in the 3.3 V domain. Depending on the target Arduino shield, the IOREF can be configured as
5 V or 3.3 V via a jumper on P2 (Figure 4).
To select 3.3 V as IOREF, short pins 1 and 2 of P2.
To select 5 V as IOREF, short pins 2 and 3 of P2.

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Figure 4 Jumper selection for IOREF
2.3 ISCP header
In case connection via the ISCP header is required to the target Arduino shield, do not use the pins from header
P7. Instead, connect the pins via jumper wires from the SPI pins on header P3 (Figure 5).
Figure 5 Use SPI pins on P3 instead of P7 (ISCP)

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Software set-up
3Software set-up
This section highlights the steps needed in order to use Infineon’s 24 GHz radar system platform with the
Arduino IDE.
3.1 Download and install Arduino IDE
The first step is to download the latest Arduino IDE version from https://www.arduino.cc/en/main/software
(Figure 6). Select the desired installation type and follow the installation instructions accordingly.
Figure 6 Downloading the Arduino IDE
3.2 Install Infineon’s Arduino package
1. Launch the Arduino IDE.
2. Navigate to File > Preferences (Figure 7).
3. Copy the following URL into the “Additional Boards Manager URLs” field (Figure 8):
https://github.com/Infineon/Assets/releases/download/current/package_infineon_index.json
Once done, click “OK”.
4. Navigate to Tools > Board > Boards Manager (Figure 9). Type “XMC” into the search field. Select the latest
version from the drop-down box and click “Install”.
5. Once installation is completed, the XMC-based microcontroller boards can be found and selected under
Tools > Board (Figure 10).

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Figure 7 Arduino IDE: File > Preferences
Figure 8 Entering the location from which the package can be downloaded

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Figure 9 Installing the XMC package
Figure 10 Selecting XMC baseboard

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3.3 Using Pulsed Doppler Radar Library
The Pulsed Doppler Radar Library is installed as part of the core libraries for XMC when the XMC Arduino
package is installed as shown in Section 3.2.
1. To use the Pulsed Doppler Radar Library in Arduino sketch, it must first be added via Sketch > Include Library
> IFXRadarPulsedDoppler (Figure 11).
Figure 11 Including and using the Library in Arduino sketch
2. Next, declare a Radar Pulsed Doppler object, such as shown in Figure 12.
Figure 12 Declaring Pulsed Doppler Radar object

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3. Next, some steps are required to initialize the hardware for the Pulsed Doppler Radar and also to configure
the parameters. All these are to be done within the setup() routine (Figure 13).
Figure 13 Initializing hardware and parameters for Pulsed Doppler Radar
The lines of code will initialize the software to use the default parameters. In case custom parameters are
preferred, the user can call the respective APIs (as listed in Table 1) before calling the begin() function.
Table 1 Configuration APIs
API name
Description
uint8_t setMinSpeed(float speedMs);
Set the minimum speed that will be detected
float getMinSpeed(void);
Retrieve the minimum speed configured
uint8_t setMaxSpeed(float speedMs);
Set maximum speed that will be detected
float getMaxSpeed(void);
Retrieve the maximum speed configured
uint8_t setMotionSensitivity(float threshold);
Set threshold that will determine motion or not
float getMotionSensitivity(void);
Retrieve threshold that will determine motion or not
uint8_t setDopplerSensitivity(float threshold);
Set threshold that will determine motion with
direction (departing/approaching) or not

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API name
Description
float getDopplerSensitivity(void);
Retrieve threshold that will determine motion with
direction (departing/approaching) or not
uint8_t setFramePeriod(uint8_t periodUs);
Set frame period in µs
uint8_t getFramePeriod(void);
Retrieve configured frame period in µs
uint8_t setSampleFreq(uint32_t frequencyHz);
Set ADC sampling frequency in Hz
uint32_t getSampleFreq(void);
Retrieve ADC sampling frequency in Hz
uint8_t setSkipSamples(uint32_t numSamples);
Set the number of samples to skip at beginning of
frame
uint32_t getSkipSamples(void);
Retrieve the number of samples to skip at beginning
of frame
uint8_t setNumSamples(uint32_t numSamples);
Set size of raw IQ ADC buffer
uint32_t getNumSamples(void);
Retrieve configured size of raw IQ ADC buffer
uint8_t setPulseWidth(uint32_t widthUs);
Set the pulse width in µs
uint32_t getPulseWidth(void);
Retrieve the configured pulse width in µs
uint32_t getMinFramePeriod(void);
Get the minimum frame period in µs
4. Next, define the callback function to perform application tasks upon completion of a round of radar
processing, for example to turn on or off an LED. In the example shown in Figure 14, different LED colors are
used to indicate different radar processing results. Table 2 lists the APIs that can be called to retrieve the
result of the radar processing.
Table 2 Result APIs
API name
Description
bool targetAvailable(void);
Returns true: motion (with no direction), false: no
motion
float getDopplerLevel(void);
Retrieve the Doppler level of the detected target
float getDopplerFreqHz(void);
Retrieve the Doppler frequency of the detected
target
float getVelocity(void);
Retrieve the signed velocity value
uint8_t getDirection(void);
Returns 0: no direction, 1: departing, 2: approaching
float getSpeed(void);
Retrieve the unsigned speed value

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Figure 14 Example for callback function definition
5. Finally, add the run() API in the loop() routine to run the radar processing (Figure 15).

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Figure 15 Call run() in main loop()
Table 3 lists the available control APIs for the Pulsed Doppler Radar Library.
Table 3 Control APIs
API name
Description
void initHW(void);
To initialize hardware for Pulsed Doppler Radar
void
registerResultCallback(void(*callBackPtr));
To register function to be called when radar process
is done
void registerErrorCallback(void(*callBackPtr));
To register function to be called in case of error
void begin(void);
To initialize software parameters for Pulsed Doppler
Radar
void end(void);
To stop radar processing; usually called during
runtime before reconfiguring radar parameters
void run(void);
To run radar processing
3.4 Example sketches
Two Arduino sketch examples are provided in the current library release. These examples can be accessed from
File > Examples > IFXRadarPulsedDoppler (Figure 16). Table 4 provides a brief description of these examples.

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Figure 16 Accessing example sketches from this library
Table 4 Example sketches
Sketch name
Required HW
Description
Radar_Pulsed_Doppler
_LED
Radar baseboard XMC4700 and BGT24LTR11 radar
shield
Use on-board LED to
indicate detection of
motion and direction
of motion
RadarPulsedDoppler
_Andee_RGB
1) Radar baseboard XMC4700 and BGT24LTR11 radar
shield
2) Annikken Andee U shield
(https://www.annikken.com/andee-u)
3) RGB LED lighting shield with XMC1202
(https://www.infineon.com/cms/en/product/evaluation-
boards/kit_led_xmc1202_as_01/)
Project and display the
results of radar
processing on a smart
device (e.g. cell
phone/tablet) via
Bluetooth, and at the
same time using an
external RGB LED to
indicate motion and
direction of motion
3.4.1 Example 1: Radar_Pulsed_Doppler_LED
This section lists the steps to follow to get this example up and running.
1. In Arduino IDE, navigate to File > Examples > IFXRadarPulsedDoppler > Radar_Pulsed_Doppler_LED (as shown
previously in Figure 16).The sketch will open (Figure 17).

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Figure 17 Example sketch: Radar_Pulsed_Doppler_LED
2. Navigate to Tools > Board > XMC4700 Radar Baseboard (as shown previously in Figure 10) to select the radar
baseboard as the target kit.
3. Compile the sketch by clicking the “Verify” button (Figure 18). A success message will be displayed on
compilation completion (Figure 19).
Figure 18 Compiling the sketch
Figure 19 Compilation successful

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4. Attach the BGT24LTR11 radar shield to the radar baseboard XMC4700 via the SAMTEC connectors (Figure
20).
Figure 20 Attach the BGT24LTR11 radar shield to the radar baseboard XMC4700
5. Connect the radar baseboard XMC4700 to the PC via a USB cable onto the “Debug” USB port (Figure 21).
Figure 21 Connect USB cable to debug port

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6. Upload the code onto the board by clicking the “Upload” button (Figure 22).
Figure 22 Uploading code onto board
The application can now be tested. Make some movements in front of the radar board and observe the LED
colors depending on the motion and its direction (Figure 23).
Table 5 LED color based on motion for Example 1
LED color
Type of motion
Off
No motion
Red
Departing
Green
Approaching
Blue
Motion with no meaningful direction
Figure 23 Observe LED color change with motion
3.4.2 Example 2: RadarPulsedDoppler_Andee_RGB
This section lists the steps to follow to get this example up and running.