This code example uses a SPI resource and Smart I/O in PSoC™ 6 MCU to implement the serial general purpose input/output (SGPIO) target interface, which is a four-signal bus defined in the SFF-8485 standard. Another SPI resource is used to implement the SGPIO initiator, which drives the clock on the SGPIO bus.
Provide feedback on this code example.
- ModusToolbox™ software v3.0 or later (tested with v3.0)
- PSoC™ 6 Board support package (BSP) minimum required version: 4.0.0
- Programming language: C
- Associated parts: All PSoC™ 6 MCU and XMC7000 MCU parts
- GNU Arm® embedded compiler v10.3.1 (
GCC_ARM) - Default value ofTOOLCHAIN - Arm® compiler v6.16 (
ARM) - IAR C/C++ compiler v9.30.1 (
IAR)
- PSoC™ 6 Wi-Fi Bluetooth® prototyping kit (
CY8CPROTO-062-4343W) – Default value ofTARGET - PSoC™ 6 Wi-Fi Bluetooth® pioneer kit (
CY8CKIT-062-WIFI-BT) - PSoC™ 6 Bluetooth® LE pioneer kit (
CY8CKIT-062-BLE) - PSoC™ 6 Bluetooth® LE prototyping kit (
CY8CPROTO-063-BLE) - PSoC™ 62S2 Wi-Fi Bluetooth® pioneer kit (
CY8CKIT-062S2-43012) - PSoC™ 64 "Secure Boot" Wi-Fi Bluetooth® pioneer kit (
CY8CKIT-064B0S2-4343W) - Rapid IoT connect platform RP01 feather kit (
CYSBSYSKIT-01) - Rapid IoT connect developer kit (
CYSBSYSKIT-DEV-01) - PSoC™ 62S2 evaluation kit (
CY8CEVAL-062S2,CY8CEVAL-062S2-LAI-4373M2)
This example implements a loop back between the SGPIO target and SGPIO master. External wiring is required between pins.
Table 1. External wire connections
| Kit's name | Pins to connect | SGPIO signal description |
|---|---|---|
| CY8CPROTO-062-4343W | P9[0] to P13[0] P9[1] to P13[1] P9[2] to P13[2] P9[3] to P13[3] |
SDataOut SDataIn SClock SLoad |
| CYSBSYSKIT-01 | P9[0] to P5[0] P9[1] to P5[1] P9[2] to P5[2] P9[3] to P5[3] |
SDataOut SDataIn SClock SLoad |
| CYSBSYSKIT-DEV-01 | P9[0] to P5[0] P9[1] to P5[1] P9[2] to P5[2] P9[3] to P5[3] |
SDataOut SDataIn SClock SLoad |
| All other kits | P9[0] to P10[0] P9[1] to P10[1] P9[2] to P10[2] P9[3] to P10[3] |
SDataOut SDataIn SClock SLoad |
Pins from port 9 are mapped to the SGPIO target. Pins from port 13 or 10 are mapped to the SGPIO initiator.
Note: Only port 9 and port 8 support Smart I/O. That means the SGPIO target can only be placed in the 0~3 pins of these two ports.
This example uses the board's default configuration. See the kit user guide to ensure that the board is configured correctly.
Note: For this example project using the above pin connections, the PSoC™ 6 Wi-Fi Bluetooth® pioneer kit (CY8CKIT-062-WIFI-BT) requires a zero-ohm resistor to be added at R162.
Note: The PSoC™ 6 Bluetooth® LE pioneer kit (CY8CKIT-062-BLE) and the PSoC™ 6 Wi-Fi Bluetooth® pioneer kit (CY8CKIT-062-WIFI-BT) ship with KitProg2 installed. The ModusToolbox™ software requires KitProg3. Before using this code example, make sure that the board is upgraded to KitProg3. The tool and instructions are available in the Firmware Loader GitHub repository. If you do not upgrade, you will see an error like "unable to find CMSIS-DAP device" or "KitProg firmware is out of date".
Install a terminal emulator if you do not have one. Instructions in this document use Tera Term.
This example requires no additional software or tools.
Create the project and open it using one of the following:
In Eclipse IDE for ModusToolbox™ software
-
Click the New Application link in the Quick Panel (or, use File > New > ModusToolbox™ Application). This launches the Project Creator tool.
-
Pick a kit supported by the code example from the list shown in the Project Creator - Choose Board Support Package (BSP) dialog.
When you select a supported kit, the example is reconfigured automatically to work with the kit. To work with a different supported kit later, use the Library Manager to choose the BSP for the supported kit. You can use the Library Manager to select or update the BSP and firmware libraries used in this application. To access the Library Manager, click the link from the Quick Panel.
You can also just start the application creation process again and select a different kit.
If you want to use the application for a kit not listed here, you may need to update the source files. If the kit does not have the required resources, the application may not work.
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In the Project Creator - Select Application dialog, choose the example by enabling the checkbox.
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(Optional) Change the suggested New Application Name.
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The Application(s) Root Path defaults to the Eclipse workspace which is usually the desired location for the application. If you want to store the application in a different location, you can change the Application(s) Root Path value. Applications that share libraries should be in the same root path.
-
Click Create to complete the application creation process.
For more details, see the Eclipse IDE for ModusToolbox™ software user guide (locally available at {ModusToolbox™ software install directory}/docs_{version}/mt_ide_user_guide.pdf).
In command-line interface (CLI)
ModusToolbox™ software provides the Project Creator as both a GUI tool and the command line tool, "project-creator-cli". The CLI tool can be used to create applications from a CLI terminal or from within batch files or shell scripts. This tool is available in the {ModusToolbox™ software install directory}/tools_{version}/project-creator/ directory.
Use a CLI terminal to invoke the "project-creator-cli" tool. On Windows, use the command line "modus-shell" program provided in the ModusToolbox™ software installation instead of a standard Windows command-line application. This shell provides access to all ModusToolbox™ software tools. You can access it by typing modus-shell in the search box in the Windows menu. In Linux and macOS, you can use any terminal application.
The "project-creator-cli" tool has the following arguments:
| Argument | Description | Required/optional |
|---|---|---|
--board-id |
Defined in the <id> field of the BSP manifest |
Required |
--app-id |
Defined in the <id> field of the CE manifest |
Required |
--target-dir |
Specify the directory in which the application is to be created if you prefer not to use the default current working directory | Optional |
--user-app-name |
Specify the name of the application if you prefer to have a name other than the example's default name | Optional |
The following example clones the "Hello world" application with the desired name "MyHelloWorld" configured for the CY8CPROTO-062-4343W BSP into the specified working directory, C:/mtb_projects:
project-creator-cli --board-id CY8CPROTO-062-4343W --app-id mtb-example-psoc6-hello-world --user-app-name MyHelloWorld --target-dir "C:/mtb_projects"
Note: The project-creator-cli tool uses the git clone and make getlibs commands to fetch the repository and import the required libraries. For details, see the "Project creator tools" section of the ModusToolbox™ software user guide (locally available at {ModusToolbox™ software install directory}/docs_{version}/mtb_user_guide.pdf).
To work with a different supported kit later, use the Library Manager to choose the BSP for the supported kit. You can invoke the Library Manager GUI tool from the terminal using make modlibs command or use the Library Manager CLI tool "library-manager-cli" to change the BSP.
The "library-manager-cli" tool has the following arguments:
| Argument | Description | Required/optional |
|---|---|---|
--add-bsp-name |
Name of the BSP that should be added to the application | Required |
--set-active-bsp |
Name of the BSP that should be as active BSP for the application | Required |
--add-bsp-version |
Specify the version of the BSP that should be added to the application if you do not wish to use the latest from manifest | Optional |
--add-bsp-location |
Specify the location of the BSP (local/shared) if you prefer to add the BSP in a shared path | Optional |
Following example adds the CY8CPROTO-062-4343W BSP to the already created application and makes it the active BSP for the app:
library-manager-cli --project "C:/mtb_projects/MyHelloWorld" --add-bsp-name CY8CPROTO-062-4343W --add-bsp-version "latest-v4.X" --add-bsp-location "local"
library-manager-cli --project "C:/mtb_projects/MyHelloWorld" --set-active-bsp APP_CY8CPROTO-062-4343W
In third-party IDEs
Use one of the following options:
-
Use the standalone Project Creator tool:
-
Launch Project Creator from the Windows Start menu or from {ModusToolbox™ software install directory}/tools_{version}/project-creator/project-creator.exe.
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In the initial Choose Board Support Package screen, select the BSP, and click Next.
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In the Select Application screen, select the appropriate IDE from the Target IDE drop-down menu.
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Click Create and follow the instructions printed in the bottom pane to import or open the exported project in the respective IDE.
-
-
Use command-line interface (CLI):
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Follow the instructions from the In command-line interface (CLI) section to create the application.
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Export the application to a supported IDE using the
make <ide>command. -
Follow the instructions displayed in the terminal to create or import the application as an IDE project.
-
For a list of supported IDEs and more details, see the "Exporting to IDEs" section of the ModusToolbox™ software user guide (locally available at {ModusToolbox™ software install directory}/docs_{version}/mtb_user_guide.pdf).
If using a PSoC™ 64 "Secure" MCU kit (like CY8CKIT-064B0S2-4343W), the PSoC™ 64 device must be provisioned with keys and policies before being programmed. Follow the instructions in the "Secure Boot" SDK user guide to provision the device. If the kit is already provisioned, copy-paste the keys and policy folder to the application folder.
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Connect the board to your PC using the provided USB cable through the KitProg3 USB connector.
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Open a terminal program and select the KitProg3 COM port. Set the serial port parameters to 8N1 and 115200 baud.
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Program the board using one of the following:
Using Eclipse IDE for ModusToolbox™ software
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Select the application project in the Project Explorer.
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In the Quick Panel, scroll down, and click <Application Name> Program (KitProg3_MiniProg4).
Using CLI
From the terminal, execute the
make programcommand to build and program the application using the default toolchain to the default target. The default toolchain and target are specified in the application's Makefile but you can override those values manually:make program TARGET=<BSP> TOOLCHAIN=<toolchain>Example:
make program TARGET=CY8CPROTO-062-4343W TOOLCHAIN=GCC_ARM -
-
After programming, the application starts automatically. Confirm that "<CE Title>" is displayed on the UART terminal.
Figure 1. Terminal output on program startup
-
The device constantly writes the same data to the SGPIO bus. Press the kit's user button to print the latest status of the device. Confirm that the terminal displays the following information.
Figure 2. Terminal output on button press
You can debug the example to step through the code. In the IDE, use the <Application Name> Debug (KitProg3_MiniProg4) configuration in the Quick Panel. For details, see the "Program and debug" section in the Eclipse IDE for ModusToolbox™ software user guide.
Note: (Only while debugging) On the CM4 CPU, some code in main() may execute before the debugger halts at the beginning of main(). This means that some code executes twice – once before the debugger stops execution, and again after the debugger resets the program counter to the beginning of main(). See KBA231071 to learn about this and for the workaround.
This design provides middleware files (sgpio_target.c/h) to implement the SGPIO target interface. It requires an SPI resource and a Smart I/O resource. All the initialization of these blocks are handled by the middleware. You need to configure only the clocks and pin assignment for the SPI and Smart I/O.
The SGPIO interface time diagram is shown as follows. It streams information about 4 drives, where each drive contains 3 bits.
Figure 3. Repeating bit stream (from SFF-8485)
Due to the similarities to the SPI interface, you can leverage the SPI master to simulate the SGPIO initiator. The SPI master is configured with the Sub Mode set to TI (Start Coincides) and the data width set to 12 (size of the SGPIO frame for 4 drives).
Figure 4. SPI frame as SGPIO initiator
Note: The SGPIO target can support up to 20 drives, but the SGPIO initiator in this example only works with 4 drives.
The mapping between the two interfaces is shown in the following table:
Table 2. SPI and SGPIO mapping
| SPI signal | SGPIO signal | Description |
|---|---|---|
| SCLK | SClock | Clock driven by the SPI master / SGPIO initiator |
| MOSI | SDataOut | Data driven by the SPI master / SGPIO initiator |
| MISO | SDataIn | Data driven by the SPI slave / SGPIO target |
| SS | SLoad | Indicates when the bit stream starts |
Note: SLoad in the SGPIO interface contains some additional vendor-specific bits. These bits are not supported in this implementation.
Each SGPIO frame contains information about a drive. It has three bits and can indicate the drive's information such as activity, location, and errors.
The SGPIO interface requires a bus clock of up to 100 kHz. Therefore, the SPI master (SGPIO initiator) data rate is configured to 100 kbps.
The SPI slave (SGPIO target) data rate is configured to a higher data rate (1000 kbps) to work with the Smart I/O, which is sourced by the same clock linked to the SGPIO target.
The firmware is designed to constantly send data over the SGPIO interface. When the kit's button is pressed, the drive's information is printed to the terminal.
The SGPIO target init function requires an SPI resource and Smart I/O resource as arguments. The SPI resource is configured to generate an interrupt when the Rx buffer is not empty. The interrupt handler parses the bits to construct the SGPIO frame so that you can use high-level functions in the firmware to read/write to the SGPIO bus.
The Smart I/O resource is configured to translate the SGPIO-SLoad signal to the SPI-SS signal. It uses the internal LUTs to detect the rising edge of the SGPIO-SLoad signal, which indicates when the SPI-SS signal needs to assert. The data lines between the SPI and SGPIO behave identically, not requiring any manipulation by the Smart I/O resource.
There are two interrupts in this code example:
-
button_interrupt_handler: It triggers on pressing the kit's button. It sets a flag to be read in the main loop.
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sgpio_interrupt_handler: It triggers when the SGPIO target's internal FIFO has data. It executes the SGPIO target middleware interrupt function.
Table 3. Application resources
| Resource | Alias/object | Purpose |
|---|---|---|
| SCB (SPI) (PDL) | SGPIO_INITIATOR_SPI | Simulates the SGPIO initiator |
| SCB (SPI) (PDL) | SGPIO_TARGET_SPI | Used by the SGPIO target middleware to serialize data |
| Smart I/O (PDL) | SMARTIO | Used by the SGPIO target middleware to translate SPI to SGPIO |
| UART (HAL) | cy_retarget_io_uart_obj | UART HAL object used by retarget-io for the Debug UART port |
| GPIO (HAL) | CYBSP_USER_BTN | User button |
| Resources | Links |
|---|---|
| Application notes | AN228571 – Getting started with PSoC™ 6 MCU on ModusToolbox™ software AN215656 – PSoC™ 6 MCU: Dual-CPU system design |
| Code examples | Using ModusToolbox™ software on GitHub Using PSoC™ Creator |
| Device documentation | PSoC™ 6 MCU datasheets PSoC™ 6 technical reference manuals |
| Development kits | Select your kits from the evaluation board finder |
| Libraries on GitHub | mtb-pdl-cat1 – PSoC™ 6 peripheral driver library (PDL) mtb-hal-cat1 – Hardware abstraction layer (HAL) library retarget-io – Utility library to retarget STDIO messages to a UART port |
| Middleware on GitHub | capsense – CAPSENSE™ library and documents psoc6-middleware – Links to all PSoC™ 6 MCU middleware |
| Tools | Eclipse IDE for ModusToolbox™ software – ModusToolbox™ software is a collection of easy-to-use software and tools enabling rapid development with Infineon MCUs, covering applications from embedded sense and control to wireless and cloud-connected systems using AIROC™ Wi-Fi and Bluetooth® connectivity devices. |
Infineon provides a wealth of data at www.infineon.com to help you select the right device, and quickly and effectively integrate it into your design.
For PSoC™ 6 MCU devices, see How to design with PSoC™ 6 MCU – KBA223067 in the Infineon community.
Document title: CE231066 - PSoC™ 6 MCU: SGPIO target interface
| Version | Description of change |
|---|---|
| 1.0.0 | New code example |
| 1.1.0 | Added support for CYSBSYSKIT-01 Rapid IoT connect platform RP01 feather kit |
| 1.2.0 | Added support for CYSBSYSKIT-DEV-01 Rapid IoT connect developer kit |
| 1.3.0 | Updated CUSTOM design.modus for CYSBSYSKIT-01 Rapid IoT connect developer kit |
| 1.4.0 | Updated to support ModusToolbox™ software v2.3 Added support for CY8CEVAL-062S2, CY8CEVAL-062S2-LAI-4373M2 |
| 2.0.0 | Removed target specific macros from the source code |
| 3.0.0 | Major Updated to support ModusToolbox™ software v3.0 and BSPs v4.X This version is not backward compatible with previous versions of ModusToolbox |
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