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# I2C Slave Application
## Overview
This application demonstrates how to use the I2C driver interface to send and receive data over the I2C interface between two targets. The sample code includes both I2C master and I2C slave modules, and can be built as stand-alone master or slave applications using a command line option.
The application is meant to be run on two eval kits - as a I2C master on one board and in I2C slave mode on the other board. The I2C interface of the
boards should be inter-connected to demonstrate functionality correctly.
This app uses the Infineon Bluetooth® SoCs and ModusToolbox™.
## Requirements
- **Tool**: [ModusToolbox™](https://www.infineon.com/cms/en/design-support/tools/sdk/modustoolbox-software/)
- **Programming Language**: C
- **Associated Parts**: [CYW20819](https://www.infineon.com/cms/en/product/wireless-connectivity/airoc-bluetooth-le-bluetooth-multiprotocol/airoc-bluetooth-le-bluetooth/cyw20819/). [CYW20820](https://www.infineon.com/cms/en/product/wireless-connectivity/airoc-bluetooth-le-bluetooth-multiprotocol/airoc-bluetooth-le-bluetooth/cyw20820/). [CYW89820](https://www.infineon.com/cms/en/product/wireless-connectivity/airoc-bluetooth-le-bluetooth-multiprotocol/airoc-bluetooth-le-bluetooth/cyw89820/). [CYW20835](https://www.infineon.com/cms/en/product/wireless-connectivity/airoc-bluetooth-le-bluetooth-multiprotocol/airoc-bluetooth-le/cyw20835/)
## Supported Kits
For a detailed list of supported kits, see the `makefile` file of the application.
## Hardware-setup
Get 2 boards and 3 jumper wires. As mentioned above, use one board for I2C slave
and the other for I2C master. Connect SLK, SDA, and ground on one board to the
same pins on the second board.
### For 20819/20820 boards:
1. I2C Master, j3 SCL <----> I2C Slave, j3 SCL.
2. I2C Master, j3 SDA <----> I2C Slave, j3 SDA.
3. Master, ground <----> I2C Slave, ground.
For your specific board, check what pin to use with Device Configurator.
## Instructions
To demonstrate the application, work through the following steps:
1. Connect both boards to the host PC. Use two serial terminal applications, like
Tera Term to view trace outputs from the applications. Open the
"WICED Peripheral UART" serial port with the following settings:
[Baud rate: 115,200bps; Data: 8 bits; Parity: None; Stop bit: 1 bit]
2. Build and download the application with MODE=SLAVE option to the slave board.
For example: make program UART=COM52 TARGET=CYW920819M2EVB-01 MODE=SLAVE
3. Next, do the same but with MODE=MASTER option and download it to the master board.
For example: make program UART=COM102 TARGET=CYW920819M2EVB-01 MODE=MASTER
The COM port numbers mentioned about may be different for your PC/boards, check for
correct COM port to use for download on your host system.
4. If you don't observe any I2C transfers on the log traces, press I2C slave reset
button first after download and press I2C master reset button later after download.
## Operation
1. The master application writes packets of different length (2 or 3 bytes) to the I2C
driver interface, on timer events.
The first byte of the packet indicates an action to be performed by the slave.
2. Upon successfully receipt of the packet, the peer app performs the requested action -
a read or a write operation using offset supplied by the master.
3. The master reads the response from the slave with an I2C read and validates it.
## Sample traces
Figure 1: I2C slave application
![slave](./Images/SLAVE.PNG)
Figure 2: I2C master application
![master](./Images/MASTER.PNG)
## BTSTACK version
BTSDK AIROC&#8482; chips contain the embedded AIROC&#8482; Bluetooth&#174; stack, BTSTACK. Different chips use different versions of BTSTACK, so some assets may contain variant sets of files targeting the different versions in COMPONENT\_btstack\_vX (where X is the stack version). Applications automatically include the appropriate folder using the COMPONENTS make variable mechanism, and all BSPs declare which stack version should be used in the BSP .mk file, with a declaration such as:<br>
> COMPONENTS+=btstack\_v1<br>
or:<br>
> COMPONENTS+=btstack\_v3
## Common application settings
Application settings below are common for all BTSDK applications and can be configured via the makefile of the application or passed in via the command line.
##### BT\_DEVICE\_ADDRESS
> Set the BDA (Bluetooth&#174; Device Address) for your device. The address is 6 bytes, for example, 20819A10FFEE. By default, the SDK will set a BDA for your device by combining the 7 hex digit device ID with the last 5 hex digits of the host PC MAC address.
##### UART
> Set to the UART port you want to use to download the application. For example 'COM6' on Windows or '/dev/ttyWICED\_HCI\_UART0' on Linux or '/dev/tty.usbserial-000154' on macOS. By default, the SDK will auto-detect the port.
##### ENABLE_DEBUG
> For HW debugging, configure ENABLE\_DEBUG=1. See the document [AIROC&#8482;-Hardware-Debugging](https://infineon.github.io/btsdk-docs/BT-SDK/AIROC-Hardware-Debugging.pdf) for more information. This setting configures GPIO for SWD.<br>
>
- CYW920819EVB-02/CYW920820EVB-02: SWD signals are shared with D4 and D5, see SW9 in schematics.
- CYBT-213043-MESH/CYBT-213043-EVAL/CYBT-253059-EVAL: SWD signals are routed to P12=SWDCK and P13=SWDIO. Use expansion connectors to connect VDD, GND, SWDCK, and SWDIO to your SWD Debugger probe.
- CYBT-223058-EVAL/CYW920835M2EVB-01/CYBT-243053-EVAL/CYBLE-343072-EVAL-M2B/CYBLE-333074-EVAL-M2B/CYBLE-343072-MESH: SWD signals are routed to P02=SWDCK and P03=SWDIO. Use expansion connectors to connect VDD, GND, SWDCK, and SWDIO to your SWD Debugger probe.
- CYBT-263065-EVAL/CYBT-273063-EVAL: SWD signals are routed to P02=SWDCK and P04=SWDIO. Use expansion connectors to connect VDD, GND, SWDCK, and SWDIO to your SWD Debugger probe.
- CYBT-343026-EVAL/CYBT-353027-EVAL/CYBT-333047-EVAL: SWD signals are routed to P11=SWDCK and P15=SWDIO. Use expansion connectors to connect VDD, GND, SWDCK, and SWDIO to your SWD Debugger probe.
- CYBT-413055-EVAL/CYBT-413061-EVAL: SWD signals are routed to P16=SWDCK and P17=SWDIO. Use expansion connectors to connect VDD, GND, SWDCK, and SWDIO to your SWD Debugger probe.
- CYW989820EVB-01: SWDCK (P02) is routed to the J13 DEBUG connector, but not SWDIO. Add a wire from J10 pin 3 (PUART CTS) to J13 pin 2 to connect GPIO P10 to SWDIO.
- CYW920719B2Q40EVB-01: PUART RX/TX signals are shared with SWDCK and SWDIO. Remove RX and TX jumpers on J10 when using SWD. PUART and SWD cannot be used simultaneously on this board unless these pins are changed from the default configuration.
- CYW920721M2EVK-02/CYW920721M2EVB-03: The default setup uses P03 for SWDIO and P05 for SWDCK. Check the position of SW15 if using JLink with the DEBUG connector.
- CYW920706WCDEVAL: SWD debugging requires fly-wire connections. The default setup P15 (J22 pin 3 or J24 pin 1) for SWDIO and P11 (J23 pin 5
or J22 pin 4) for SWDCK.
- CYW920736M2EVB-01: SWD hardware debugging requires fly-wire connections. The only option is using P14 for SWDCK and P15 for SWDIO. These route to Arduino header J2, A1 and A0. These can be fly-wired to Arduino header J4, D4 and D5. From there the signals connect to the KitProg3 SWD bridge. In addition, the debug macros (SETUP\_APP\_FOR\_DEBUG\_IF\_DEBUG\_ENABLED and BUSY\_WAIT\_TILL\_MANUAL\_CONTINUE\_IF\_DEBUG\_ENABLED) are placed in sparinit.c in code common to all applications for this device. Most applications for this device call bleprofile\_GPIOInit() in subsequent code, overwriting the SWD pin configuration. To use hardware debugging after the call to bleprofile\_GPIOInit(), place the debug macros in code after that call.
- CYW943012B2EVK-01: SWD signals are shared with D4 and D5.
- CYW920820M2EVB-01 & CYW920819M2EVB-01: The default setup uses P03 for SWDIO and P02 for SWDCK. Check the position of SW15 if using JLink with the DEBUG connector.
- CYW989820M2EVB-01: SWD hardware debugging requires a fly-wire connection to use P14 for SWDIO. P2 is connected directly to SWDCK / ARD_D4. Fly-wire P14 / ARD_D8 on J3.10 to J4.3 / ARD_D5 to connect SWDIO.
- SWD hardware debugging is not supported on the following:
- CYW920721M2EVK-01
- CYW920835REF-RCU-01
- CYW9M2BASE-43012BT
- CYBT-423054-EVAL
- CYBT-423060-EVAL
- CYBT-483056-EVAL
- CYBT-483062-EVAL
- CYW955572BTEVK-01
##### DIRECT_LOAD
> BTSDK chips support downloading applications either to FLASH storage or to RAM storage. Some chips support only one or the other, and some chips support both.
> If a chip only supports one or the other, this variable is not applicable, applications will be downloaded to the appropriate storage supported by the device.
> If a chip supports both FLASH and RAM downloads, the default is to download to FLASH, and the DIRECT_LOAD make variable may be set to 1 in the application makefile (or in the command line make command) to override the default and download to RAM.
> Currently, the following chips support both FLASH and RAM download and can set DIRECT_LOAD=1 if desired:
>
- CYW20835
- CYW20706
## Building and downloading code examples
**Using the ModusToolbox&#8482; Eclipse IDE**
1. Install ModusToolbox&#8482; 2.2 (or higher).
2. In the ModusToolbox&#8482; Eclipse IDE, click the **New Application** link in the Quick Panel (or, use **File > New > ModusToolbox IDE Application**).
3. Pick your board for BTSDK under AIROC&#8482; Bluetooth&#174; BSPs.
4. Select the application in the IDE.
5. In the Quick Panel, select **Build** to build the application.
6. To program the board (download the application), select **Program** in the Launches section of the Quick Panel.
**Using command line**
1. Install ModusToolbox&#8482; 2.2 (or higher).
2. On Windows, use Cygwin from \ModusToolbox\tools_2.x\modus-shell\Cygwin.bat to build apps.
3. Use the tool 'project-creator-cli' under \ModusToolbox\tools_2.x\project-creator\ to create your application.<br/>
> project-creator-cli --board-id (BSP) --app-id (appid) -d (dir) <br/>
See 'project-creator-cli --help' for useful options to list all available BSPs, and all available apps per BSP.<br/>
For example:<br/>
> project-creator-cli --app-id mtb-example-btsdk-empty --board-id CYW920706WCDEVAL -d .<br/>
4. To build the app call make build. For example:<br/>
> cd mtb-examples-btsdk-empty<br/>
> make build<br/>
5. To program (download to) the board, call:<br/>
> make qprogram<br/>
6. To build and program (download to) the board, call:<br/>
> make program<br/><br>
Note: make program = make build + make qprogram
If you have issues downloading to the board, follow the steps below:
- Press and hold the 'Recover' button on the board.
- Press and hold the 'Reset' button on the board.
- Release the 'Reset' button.
- After one second, release the 'Recover' button.
Note: this is only applicable to boards that download application images to FLASH storage. Boards that only support RAM download (DIRECT_LOAD) such as CYW9M2BASE-43012BT can be power cycled to boot from ROM.
## Over The Air (OTA) Firmware Upgrade
Applications that support OTA upgrade can be updated via the peer OTA app in:<br>
>\<Workspace Dir>\mtb\_shared\wiced\_btsdk\tools\btsdk-peer-apps-ota<br>
See the readme.txt file located in the above folder for instructions.<br>
To generate the OTA image for the app, configure OTA\_FW\_UPGRADE=1 in the app
makefile, or append OTA\_FW\_UPGRADE=1 to a build command line, for example:
> make PLATFORM=CYW920706WCDEVAL OTA\_FW\_UPGRADE=1 build<br>
This will the generate \<app>.bin file in the 'build' folder.
## SDK software features
- Dual-mode Bluetooth&#174; stack included in the ROM (BR/EDR and LE)
- Bluetooth&#174; stack and profile level APIs for embedded Bluetooth&#174; application development
- AIROC&#8482; HCI protocol to simplify host/MCU application development
- APIs and drivers to access on-board peripherals
- Bluetooth&#174; protocols include GAP, GATT, SMP, RFCOMM, SDP, AVDT/AVCT, LE Mesh
- LE and BR/EDR profile APIs, libraries, and sample apps
- Support for Over-The-Air (OTA) upgrade
- Device Configurator for creating custom pin mapping
- Bluetooth&#174; Configurator for creating LE GATT Database
- Peer apps based on Android, iOS, Windows, etc. for testing and reference
- Utilities for protocol tracing, manufacturing testing, etc.
- Documentation for APIs, datasheets, profiles, and features
- BR/EDR profiles: A2DP, AVRCP, HFP, HSP, HID, SPP, MAP, PBAP, OPP
- LE profiles: Mesh profiles, HOGP, ANP, BAP, HRP, FMP, IAS, ESP, LE COC
- Apple support: Apple Media Service (AMS), Apple Notification Center Service (ANCS), iBeacon, Homekit, iAP2
- Google support: Google Fast Pair Service (GFPS), Eddystone
- Amazon support: Alexa Mobile Accessories (AMA)
Note: this is a list of all features and profiles supported in BTSDK, but some AIROC&#8482; devices may only support a subset of this list.
## List of boards available for use with BTSDK
- [CYW20819A1 chip](https://github.com/Infineon/20819A1)
- [CYW920819EVB-02](https://github.com/Infineon/TARGET_CYW920819EVB-02), [CYW920819M2EVB-01](https://github.com/Infineon/TARGET_CYW920819M2EVB-01), [CYBT-213043-MESH](https://github.com/Infineon/TARGET_CYBT-213043-MESH), [CYBT-213043-EVAL](https://github.com/Infineon/TARGET_CYBT-213043-EVAL), [CYBT-223058-EVAL](https://github.com/Infineon/TARGET_CYBT-223058-EVAL), [CYBT-263065-EVAL](https://github.com/Infineon/TARGET_CYBT-263065-EVAL), [CYBT-273063-EVAL](https://github.com/Infineon/TARGET_CYBT-273063-EVAL)
- [CYW20820A1 chip](https://github.com/Infineon/20820A1)
- [CYW920820EVB-02](https://github.com/Infineon/TARGET_CYW920820EVB-02), [CYW989820M2EVB-01](https://github.com/Infineon/TARGET_CYW989820M2EVB-01), [CYW989820EVB-01](https://github.com/Infineon/TARGET_CYW989820EVB-01), [CYBT-243053-EVAL](https://github.com/Infineon/TARGET_CYBT-243053-EVAL), [CYBT-253059-EVAL](https://github.com/Infineon/TARGET_CYBT-253059-EVAL), [CYW920820M2EVB-01](https://github.com/Infineon/TARGET_CYW920820M2EVB-01)
- [CYW20721B2 chip](https://github.com/Infineon/20721B2)
- [CYW920721M2EVK-01](https://github.com/Infineon/TARGET_CYW920721M2EVK-01), [CYW920721M2EVK-02](https://github.com/Infineon/TARGET_CYW920721M2EVK-02), [CYW920721M2EVB-03](https://github.com/Infineon/TARGET_CYW920721M2EVB-03), [CYBT-423060-EVAL](https://github.com/Infineon/TARGET_CYBT-423060-EVAL), [CYBT-483062-EVAL](https://github.com/Infineon/TARGET_CYBT-483062-EVAL), [CYBT-413061-EVAL](https://github.com/Infineon/TARGET_CYBT-413061-EVAL)
- [CYW20719B2 chip](https://github.com/Infineon/20719B2)
- [CYW920719B2Q40EVB-01](https://github.com/Infineon/TARGET_CYW920719B2Q40EVB-01), [CYBT-423054-EVAL](https://github.com/Infineon/TARGET_CYBT-423054-EVAL), [CYBT-413055-EVAL](https://github.com/Infineon/TARGET_CYBT-413055-EVAL), [CYBT-483056-EVAL](https://github.com/Infineon/TARGET_CYBT-483056-EVAL)
- [CYW20706A2 chip](https://github.com/Infineon/20706A2)
- [CYW920706WCDEVAL](https://github.com/Infineon/TARGET_CYW920706WCDEVAL), [CYBT-353027-EVAL](https://github.com/Infineon/TARGET_CYBT-353027-EVAL), [CYBT-343026-EVAL](https://github.com/Infineon/TARGET_CYBT-343026-EVAL), [CYBT-333047-EVAL](https://github.com/Infineon/TARGET_CYBT-333047-EVAL)
- [CYW20835B1 chip](https://github.com/Infineon/20835B1)
- [CYW920835REF-RCU-01](https://github.com/Infineon/TARGET_CYW920835REF-RCU-01), [CYW920835M2EVB-01](https://github.com/Infineon/TARGET_CYW920835M2EVB-01), [CYBLE-343072-EVAL-M2B](https://github.com/Infineon/TARGET_CYBLE-343072-EVAL-M2B), [CYBLE-333074-EVAL-M2B](https://github.com/Infineon/TARGET_CYBLE-333074-EVAL-M2B), [CYBLE-343072-MESH](https://github.com/Infineon/TARGET_CYBLE-343072-MESH)
- [CYW43012C0 chip](https://github.com/Infineon/43012C0)
- [CYW9M2BASE-43012BT](https://github.com/Infineon/TARGET_CYW9M2BASE-43012BT), [CYW943012BTEVK-01](https://github.com/Infineon/TARGET_CYW943012BTEVK-01)
- [CYW20736A1 chip](https://github.com/Infineon/20736A1)
- [CYW920736M2EVB-01](https://github.com/Infineon/TARGET_CYW920736M2EVB-01)
- [CYW30739A0 chip](https://github.com/Infineon/30739A0)
- [CYW930739M2EVB-01](https://github.com/Infineon/TARGET_CYW930739M2EVB-01)
- [CYW55572A1 chip](https://github.com/Infineon/55572A1)
- [CYW955572BTEVK-01](https://github.com/Infineon/TARGET_CYW955572BTEVK-01)
## Folder structure
All BTSDK code examples need the 'mtb\_shared\wiced\_btsdk' folder to build and test the apps. 'wiced\_btsdk' includes the 'dev-kit' and 'tools' folders. The contents of the 'wiced\_btsdk' folder will be automatically populated incrementally as needed by the application being used.
**dev-kit**
This folder contains the files that are needed to build the embedded Bluetooth&#174; apps.
* baselib: Files for chips supported by BTSDK. For example CYW20819, CYW20719, CYW20706, etc.
* bsp: Files for BSPs (platforms) supported by BTSDK. For example CYW920819EVB-02, CYW920706WCDEVAL etc.
* btsdk-include: Common header files needed by all apps and libraries.
* btsdk-tools: Build tools needed by BTSDK.
* libraries: Profile libraries used by BTSDK apps such as audio, LE, HID, etc.
**tools**
This folder contains tools and utilities need to test the embedded Bluetooth&#174; apps.
* btsdk-host-apps-bt-ble: Host apps (Client Control) for LE and BR/EDR embedded apps, demonstrates the use of AIROC&#8482; HCI protocol to control embedded apps.
* btsdk-host-peer-apps-mesh: Host apps (Client Control) and Peer apps for embedded Mesh apps, demonstrates the use of AIROC&#8482; HCI protocol to control embedded apps, and configuration and provisioning from peer devices.
* btsdk-peer-apps-ble: Peer apps for embedded LE apps.
* btsdk-peer-apps-ota: Peer apps for embedded apps that support Over The Air Firmware Upgrade.
* btsdk-utils: Utilities used in BTSDK such as BTSpy, wmbt, and ecdsa256.
See README.md in the sub-folders for more information.
## Software Tools
The following tool applications are installed on your computer either with ModusToolbox&#8482;, or by creating an application in the workspace that can use the tool.
**BTSpy:**<br>
> BTSpy is a trace viewer utility that can be used with AIROC&#8482; Bluetooth&#174; platforms to
view protocol and application trace messages from the embedded device. The
utility is located in the folder below. For more information, see readme.txt in the same folder.<br>
This utility can be run directly from the filesystem, or it can be run from
the Tools section of the ModusToolbox&#8482; QuickPanel, or by right-clicking
a project in the Project Explorer pane and selecting the ModusToolbox&#8482;
context menu.<br>
It is supported on Windows, Linux and macOS.<br>
Location: \<Workspace Dir>\wiced_btsdk\tools\btsdk-utils\BTSpy
**Bluetooth&#174; Classic and LE Profile Client Control:**<br>
> This application emulates host MCU applications for LE and BR/EDR profiles.
It demonstrates AIROC&#8482; Bluetooth&#174; APIs. The application communicates with embedded
apps over the "WICED HCI UART" interface. The application is located in the folder
below. For more information, see readme.txt in the same folder.<br>
This utility can be run directly from the filesystem, or it can be run from
the Tools section of the ModusToolbox&#8482; QuickPanel, or by right-clicking
a project in the Project Explorer pane and selecting the ModusToolbox&#8482;
context menu.<br>
It is supported on Windows, Linux, and macOS.<br>
Location: \<Workspace Dir>\wiced\_btsdk\tools\btsdk-host-apps-bt-ble\client_control
**LE Mesh Client Control:**<br>
> Similar to the above app, this application emulates host MCU applications
for LE Mesh models. It can configure and provision mesh devices and create
mesh networks. The application is located in the folder below. For more
information, see readme.txt in the same folder.<br>
This utility can be run directly from the filesystem, or it can be run from
the Tools section of the ModusToolbox&#8482; QuickPanel (if a mesh-capable
project is selected in the Project Explorer pane), or by right-clicking
a mesh-capable project in the Project Explorer pane and selecting the
ModusToolbox&#8482; context menu.<br>
The full version is provided for Windows (VS\_ClientControl) supporting all
Mesh models.<br>
A limited version supporting only the Lighting model (QT\_ClientControl) is
provided for Windows, Linux, and macOS.<br>
Location: \<Workspace Dir>\wiced_btsdk\tools\btsdk-host-peer-apps-mesh\host
**Peer apps:**<br>
> Applications that run on Windows, iOS or Android and act as peer Bluetooth&#174; apps to
demonstrate specific profiles or features, communicating with embedded apps
over the air.<br>
LE apps location: \<Workspace Dir>\wiced\_btsdk\tools\btsdk-peer-apps-ble<br>
LE Mesh apps location: \<Workspace Dir>\wiced\_btsdk\tools\btsdk-host-peer-apps-mesh\peer<br>
OTA apps location: \<Workspace Dir>\wiced\_btsdk\tools\btsdk-peer-apps-ota
**Device Configurator:**<br>
> Use this GUI tool to create source code for a custom pin mapping for your device. Run this tool
from the Tools section of the ModusToolbox&#8482; QuickPanel, or by
right-clicking a project in the Project Explorer pane and selecting the
ModusToolbox&#8482; context menu.<br>
It is supported on Windows, Linux and macOS.<br>
Note: The pin mapping is based on wiced\_platform.h for your board.<br>
Location: \<Install Dir>\tools_2.x\device-configurator
**Bluetooth&#174; Configurator:**<br>
> Use this GUI tool to create and configure the LE GATT Database and the BR/EDR SDP Database, generated as source code for your
application.<br>
Run this tool from the Tools section of the ModusToolbox&#8482; QuickPanel, or
by right-clicking a project in the Project Explorer pane and selecting
the ModusToolbox&#8482; context menu.<br>
It is supported on Windows, Linux and macOS.<br>
Location: \<Install Dir>\tools_2.x\bt-configurator
## Tracing
To view application traces, there are 2 methods available. Note that the
application needs to configure the tracing options.<br>
1. "WICED Peripheral UART" - Open this port on your computer using a serial port
utility such as TeraTerm or PuTTY (usually using 115200 baud rate for non-Mesh apps, and 921600 for Mesh apps).<br>
2. "WICED HCI UART" - Open this port on your computer using the Client Control
application mentioned above (usually using 3M baud rate). Then run the BTSpy
utility mentioned above.
## Using BSPs (platforms)
BTSDK BSPs are located in the \mtb\_shared\wiced\_btsdk\dev-kit\bsp\ folder by default.
#### a. Selecting an alternative BSP
The application makefile has a default BSP. See "TARGET". The makefile also has a list of other BSPs supported by the application. See "SUPPORTED_TARGETS". To select an alternative BSP, use Library Manager from the Quick Panel to deselect the current BSP and select an alternate BSP. Then right-click the newly selected BSP and choose 'Set Active'. This will automatically update TARGET in the application makefile.
#### b. Custom BSP
**Complete BSP**
To create and use a complete custom BSP that you want to use in applications, perform the following steps:
1. Select an existing BSP created through ModusToolbox&#8482; Project Creator that you wish to use as a template.
2. Make a copy in the same folder and rename it. For example mtb\_shared\wiced\_btsdk\dev-kit\bsp\TARGET\_mybsp.<br/>
**Note:** This can be done in the system File Explorer and then refresh the workspace in ModusToolbox&#8482; to see the new project. Delete the .git sub-folder from the newly copied folder before refreshing in Eclipse.
If done in the IDE, an error dialog may appear complaining about items in the .git folder being out of sync. This can be resolved by deleting the .git sub-folder in the newly copied folder.
3. In the new mtb\_shared\wiced\_btsdk\dev-kit\bsp\TARGET\_mybsp\release-vX.X.X\ folder, rename the existing/original (BSP).mk file to mybsp.mk.
4. In the application makefile, set TARGET=mybsp and add it to SUPPORTED\_TARGETS.
5. In the application libs folder, edit the mtb.mk file and replace all instances of the template BSP name string with 'mybsp'.
6. Update design.modus for your custom BSP if needed using the **Device Configurator** link under **Configurators** in the Quick Panel.
7. Update the application makefile as needed for other custom BSP specific attributes and build the application.
**Custom Pin Configuration Only - Multiple Apps**
To create a custom pin configuration to be used by multiple applications using an existing BSP that supports Device Configurator, perform the following steps:
1. Create a folder COMPONENT\_(CUSTOM)\_design\_modus in the existing BSP folder. For example mtb\_shared\wiced\_btsdk\dev-kit\bsp\TARGET\_CYW920819EVB-02\release-vX.X.X\COMPONENT\_my\_design\_modus
2. Copy the file design.modus from the reference BSP COMPONENT\_bsp\_design\_modus folder under mtb\_shared\wiced\_btsdk\dev-kit\bsp\ and place the file in the newly created COMPONENT\_(CUSTOM)\_design\_modus folder.
3. In the application makefile, add the following two lines<br/>
DISABLE\_COMPONENTS+=bsp\_design\_modus<br/>
COMPONENTS+=(CUSTOM)\_design\_modus<br/>
(for example COMPONENTS+=my\_design\_modus)
4. Update design.modus for your custom pin configuration if needed using the **Device Configurator** link under **Configurators** in the Quick Panel.
5. Building of the application will generate pin configuration source code under a GeneratedSource folder in the new COMPONENT\_(CUSTOM)\_design\_modus folder.
**Custom Pin Configuration Only - Per App**
To create a custom configuration to be used by a single application from an existing BSP that supports Device Configurator, perform the following steps:
1. Create a folder COMPONENT\_(BSP)\_design\_modus in your application. For example COMPONENT\_CYW920721M2EVK-02\_design\_modus
2. Copy the file design.modus from the reference BSP under mtb\_shared\wiced\_btsdk\dev-kit\bsp\ and place the file in this folder.
3. In the application makefile, add the following two lines<br/>
DISABLE\_COMPONENTS+=bsp\_design\_modus<br/>
COMPONENTS+=(BSP)\_design\_modus<br/>
(for example COMPONENTS+=CYW920721M2EVK-02\_design\_modus)
4. Update design.modus for your custom pin configuration if needed using the **Device Configurator** link under **Configurators** in the Quick Panel.
5. Building of the application will generate pin configuration source code under the GeneratedSource folder in your application.
## Using libraries
The libraries needed by the app can be found in in the mtb\_shared\wiced\_btsdk\dev-kit\libraries folder. To add an additional library to your application, launch the Library Manager from the Quick Panel to add a library. Then update the makefile variable "COMPONENTS" of your application to include the library. For example:<br/>
COMPONENTS += fw\_upgrade\_lib
## Documentation
BTSDK API documentation is available [online](https://infineon.github.io/btsdk-docs/BT-SDK/index.html)
Note: For offline viewing, git clone the [documentation repo](https://github.com/Infineon/btsdk-docs)
BTSDK Technical Brief and Release Notes are available [online](https://community.infineon.com/t5/Bluetooth-SDK/bd-p/ModusToolboxBluetoothSDK)