Cypress Semiconductor / Mbed OS mbed-os-example-csdadc

This example demonstrates the usage of CSD analog to digital converter (ADC) for PSoC® 6 MCU with Mbed OS using the CSDADC Middleware Library.

PSoC 6 MCU: CSDADC

This example demonstrates the usage of CSD analog-to-digital converter (ADC) in PSoC® 6 MCU. The CSDADC measures the external voltage and displays the conversion result in the terminal application. This example uses the CSDADC Middleware Library.

Tested with Mbed OS v6.2.1

Requirements

• Programming Language: C/C++

• Associated Parts: All PSoC® 6 MCU parts

• Mbed CLI

• ModusToolbox v2.1

  Note: You do not need to install ModusToolbox to build and run this code example. However, installing it is required when you need to:

• Debug using the Eclipse for ModusToolbox IDE. See the user guide for details.

• Customize the default device configuration using any of the Configurator tools
• Port this code example to a new target that is not listed under the Supported Kits

Supported Toolchains (Mbed CLI argument --toolchain)

• GNU Arm® Embedded Compiler v9.2.1 (GCC_ARM)
• Arm compiler v6.14 (ARM)

Supported Kits (Mbed CLI argument --target)

• PSoC 6 Wi-Fi BT Prototyping Kit (CY8CPROTO-062-4343W)
• PSoC 6 WiFi-BT Pioneer Kit (CY8CKIT-062-WIFI-BT)
• PSoC 6 BLE Pioneer Kit (CY8CKIT-062-BLE)
• PSoC 62S2 Wi-Fi BT Pioneer Kit (CY8CKIT-062S2-43012)
• PSoC 62S1 Wi-Fi BT Pioneer Kit (CYW9P62S1-43438EVB-01)
• PSoC 62S1 Wi-Fi BT Pioneer Kit (CYW9P62S1-43012EVB-01)
• PSoC 62S3 Wi-Fi BT Prototyping Kit (CY8CPROTO-062S3-4343W)

Hardware Setup

This example uses the board’s default configuration. See the kit user guide to ensure that the board is configured correctly. Place a potentiometer as shown in Table 1 to vary the input voltage to be measured by the ADC. To change the CSDADC input pin, modify the CSDADC configuration.

Table 1. CSDADC Input Pin

Note: The PSoC 6 BLE Pioneer Kit (CY8CKIT-062-BLE) and the PSoC 6 WiFi-BT 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 If you do not upgrade, you will see an error like “unable to find CMSIS-DAP device” or “KitProg firmware is out of date”.

For Mbed OS, the kit must be in DAPLink mode. See the KitProg3 User Guide (Documentation tab in the Cypress Programming Solutions web page) for details of how to put the Pioneer Kit into DAPLink mode.

Software Setup

Install a terminal emulator if you don’t have one. Instructions in this document use Tera Term.

This example requires no additional software or tools.

Import the Code Example using Mbed CLI Tool

Mbed CLI commands are used to import the code example and compile. See Working with Mbed CLI web page.

mbed import https://github.com/cypresssemiconductorco/mbed-os-example-csdadc

This command first clones the code example repository from GitHub, and then deploys all the libraries. If you wish to perform the deploy process manually, do the following:

Clone the GitHub code example repository:

git clone https://github.com/cypresssemiconductorco/mbed-os-example-csdadc && cd mbed-os-example-csdadc

Deploy the dependent libraries. The library files are identified with .lib extension.

mbed deploy

Set the current directory as root:

mbed new .

Operation

1. Connect the board to your PC using the provided USB cable through the KitProg3 USB connector.

2. Program the board.

   mbed compile -m <TARGET> -t <TOOLCHAIN> --flash --sterm

   For instance, to build for the target CY8CPROTO_062_4343W with GCC_ARM toolchain, use the following command:

   mbed compile -m CY8CPROTO_062_4343W -t GCC_ARM --flash --sterm

Note: With the --sterm option, Mbed CLI opens a new terminal with 9600-8N1 as the setting after programming completes. Do not use this option if you want to connect using another serial terminal application such as PuTTY or Tera Term.

3. After programming, the application starts automatically. Confirm that the terminal application displays the message as shown in Figure 1.

Figure 1. Output in UART Terminal

4. Turn the knob of the potentiometer and observe that the new ADC count is printed on the serial terminal.

Debugging

You can debug the example to step through the code. In the IDE, use the \ Debug (KitProg3_MiniProg4) configuration in the Quick Panel. For more details, see the “Program and Debug” section in the Eclipse IDE for ModusToolbox User Guide.

Follow the steps from Eclipse IDE for ModusToolbox User Guide to export the Mbed OS code example and import it into ModusToolbox IDE for programming and debugging.

Mbed OS also supports debugging using any IDE that supports GDB. We recommend the user to go through ARM Mbed’s documentation on the debugging steps.

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 - 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.

Design and Implementation

In this example, the CSD block is configured as an ADC with 10-bit resolution, one input channel with the GND-to-VDDA range, and single-shot conversion mode. For more details on CSDADC, see the CSDADC Middleware Library.

The CSDADC could be configured by the ModusToolbox CSD personality. See the Configuration Considerations section in the CSDADC API Reference Guide for configuring the CSDADC.

A GPIO pin is configured as the analog input to CSDADC and a UART resource is used for displaying terminal messages.

The CSDADC is not enabled in the default board configuration provided by the BSP. This example overrides the BSP_DESIGN_MODUS component provided with the BSP to enable and configure the CSDADC. See the “Overriding the BSP Configuration Files” section of the ModusToolbox User Guide: {ModusToolbox install directory}/ide_{version}/docs/mtb_user_guide.pdf

The design.modus file containing the custom device configuration used in this application is present under the respective kit’s folder: \/COMPONENT_CUSTOM_DESIGN_MODUS/TARGET_\/design.modus.

Enabling the CSDADC Functionality

Do the following to set up the CSDADC middleware for the CSDADC operation using the Device Configurator tool.

1. Open //ModusToolbox/tools_2.1/device-configurator/device-configurator to run the Device Configurator tool.

2. Select File > Open. Navigate to and open design.modus file for the respective kit: \/TARGET_\/CUSTOM_BSP_DESIGN_MODUS/design.modus.

3. When prompted to find device support library, select the “devicesupport.xml” from \/mbed-os/targets/TARGET_Cypress/TARGET_PSOC6/psoc6pdl/
   Note: Ensure that the command mbed deploy is executed prior to this step.

4. On the System tab, configure the CLK_PERI frequency to achieve the desired frequency. This is the clock input to the CSDADC.

5. On the Peripherals tab (#1 in Figure 2), enable the CSD personality under System (#2 in Figure 2) and enter the Alias (#3 in Figure 2).

6. Go to the Parameters Pane and configure the CSD personality:

7. Assign the peripheral clock divider by using the Clock combo box (#4 in Figure 2). Any free divider can be used.

8. Set the Enable CSDADC check box (#5 in Figure 2).

9. Configure the CSDADC parameters (Resolution, Measurement Range, and Number of Channels (#5 in Figure 2).

10. Assign pins for the CSDADC Channels (#6 in Figure 2).

11. Select File > Save to generate the initialization code. This is executed as part of the init_cycfg_all() function, which is called by cybsp_init().

    Figure 2. Settings to Enable CSDADC Functionality

    

Operation at a Custom Power Supply Voltage

The application is configured to work with the default operating voltage of the kit. Table 2 lists the power supply voltages supported by each kit along with the default operating voltage.

Table 2. Operating Voltages Supported by the Kits

For kits that support multiple operating voltages, do the following to work at a custom power supply, such as 1.8 V:

1. Open //ModusToolbox/tools_2.1/device-configurator/device-configurator to run the Device Configurator tool.

2. Select File > Open. Navigate to and open design.modus file for the respective kit: \/TARGET_\/CUSTOM_BSP_DESIGN_MODUS/design.modus.

3. Update the operating conditions as shown in Figure 3 and select File > Save.

Figure 3. Power Settings to Work with 1.8 V

4. Change the jumper/switch setting as follows:

   Table 3. Jumper/Switch Position for 1.8-V Operation

   Kit	Jumper/Switch Position
   CY8CPROTO-062-4343W	J3 (1-2)
   CY8CKIT-062-BLE	SW5 (1-2)
   CY8CKIT-062-WIFI-BT	SW5 (1-2)
   CY8CKIT-062S2-43012	J14 (1-2)
   CYW9P62S1-43438EVB-01	J14 (1-2)
   CYW9P62S1-43012EVB-01	J14 (1-2)
   CY8CPROTO-062S3-4343W	J3 (1-2)

5. Re-build and program the application to evaluate the application at the new power setting.

Resources and Settings

Table 1. Application Resources

Related Resources

Other Resources

Cypress provides a wealth of data at www.cypress.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 Cypress community.

Document History

Document Title: CE231010 - PSoC 6 MCU CSDADC

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