Silicon Laboratories CP2130 User manual

CP2130-EK

CP2130 EVALUATION KIT USER’SGUIDE

1. Introduction

The CP2130 Evaluation Kit consists of a CP2130 Evaluation Board and software package to demonstrate the use

of the CP2130 USB-to-SPI bridge to communicate with several SPI slave devices, including an on-board SPI ADC

and SPI EEPROM. Several PC applications are included to demonstrate the CP2130 features and evaluate SPI

performance.

2. Kit Contents

The CP2130 Evaluation Kit contains the following items:

CP2130 Evaluation Board

Mini-USB Cable

CP21xx Installation DVD

Quick Start Guide

3. Relevant Documentation

Application notes can be found on the Interface Application Notes page for all fixed-function devices:

www.silabs.com/interface-appnotes.

AN721: CP21xx Device Customization Guide—Customize the VID, PID, serial number, and other

parameters stored in the CP2130 one-time programmable ROM.

AN792: CP2130 Interface Specification—Describes the USB control and bulk transfers for CP2130

devices as well as GPIO configuration.

4. Software Setup

The Software Development Kit (SDK) for the CP2130 Evaluation Kit is included on the kit DVD. The latest version

of this installer can also be downloaded from the www.silabs.com/cp2130ek web site. This package includes:

Documentation—data sheet, application notes, user’s guide, quick start guide, and SLAB_USB_SPI

interface library API documentation.

CP2130 Demo—Example software utilizing the SLAB_USB_SPI interface library API to demonstrate the

CP2130 Evaluation Board features.

CP2130 Evaluation Tool—Advanced evaluation software used to execute low-level SPI transfers, control

GPIO outputs, and retrieve device information.

AN721 Device Customization Utility—Customization software used to program the one-time

programmable ROM.

Library—SLAB_USB_SPI interface library and header files used to interface between a user application

and USB driver such as Microsoft’s WinUSB driver.

The Windows installer should launch automatically after inserting the DVD. Follow the instructions to install the

SDK to the system.

CP2130-EK

2 Rev. 0.2

5. CP2130 Hardware Interface

1. Connect the CP2130 Evaluation Board to a PC as shown in Figure 1.

2. Connect one end of the mini-USB cable to a USB Port on the PC.

3. Connect the other end of the mini-USB cable to the mini-USB connector on the CP2130 Evaluation Board.

Figure 1. Hardware Setup

Mini-USB

Cable

CP2130-EK

Rev. 0.2 3

6. CP2130 WinUSB Driver Installation

The CP2130 is a vendor-specific USB device with control and bulk endpoints and typically requires the installation

of a generic USB driver. To facilitate this process in Windows, Silicon Labs provides a custom driver INF file and

Microsoft Driver Package Installer (DPInst) to install the Microsoft WinUSB driver. The SDK installer will

automatically install the driver on Windows machines.

The CP2130 appears as a “Silicon Labs CP2130 USB to SPI Bridge” in Device Manager as shown in Figure 2.

Figure 2. CP2130 in Device Manager

7. CP2130 Software Interface

The SLAB_USB_SPI interface library is provided to interface between the user application and USB to control the

CP2130. The SLAB_USB_SPI interface library documentation describes the API software functions that can be

used to read or write SPI data and control the CP2130 from the PC. The CP2130 Demo software application uses

the SLAB_USB_SPI interface library to demonstrate the CP2130 Evaluation Board capabilities. The CP2130

Evaluation Tool is an advanced tool used to execute low-level SPI transfers.

CP2130-EK

4 Rev. 0.2

8. CP2130 Demo Windows Application

The CP2130 Demo uses the Windows SLAB_USB_SPI interface DLL to communicate with the on-board SPI slave

devices via the CP2130 USB-to-SPI bridge. The application controls the CP2130, which communicates with an

external 3-channel ADC and SPI EEPROM. Using the default jumper configuration, the 3-channel ADC is

connected to a potentiometer, external temperature sensor, and GPIO.5, the CP2130 CLKOUT signal. The

following steps describe how to start the application and demonstrate some of its features.

1. Make sure that the hardware is connected to a Windows PC as shown in Figure 1. If the device is properly

connected, the green Active LED on the CP2130 Evaluation Board will turn on. After a few seconds of

inactivity, the green Active LED may turn off, and the red Suspend LED will then turn on to indicate that the

device has entered USB suspend mode. This is part of a power-saving feature called USB selective

suspend.

2. Launch the CP2130 Demo application, which is found by clicking

StartAll ProgramsSilicon LaboratoriesCP2130 Evaluation KitCP2130 Demo.

3. This application demonstrates the features of the CP2130 Evaluation Board and requires the default

Jumper configuration and default one-time programmable ROM configuration. Click on the Jumper

Config button to launch the help window.

4. The Jumper Config window display the factory default jumper configuration. Install shorting blocks to

match the jumper locations outlined in red.

Figure 3. Configuring the CP2130 Evaluation Board Shorting Blocks

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Rev. 0.2 5

5. Connect to the CP2130 USB-to-SPI bridge by selecting the device in the Device Selection combo box

and clicking the Connect button.

Figure 4. Connecting to a CP2130 Evaluation Board

CP2130-EK

6 Rev. 0.2

6. Observe the potentiometer voltage displayed in the Potentiometer Voltage gauge. Rotate the

potentiometer and watch the voltage change.

7. Observe the temperature sensor value displayed in the Temperature Sensor gauge.

Figure 5. Reading the Potentiometer and Temperature Sensor ADC Channel Inputs

6 7

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Rev. 0.2 7

8. Run SPI throughput tests using CS1:

a. Select the transfer mode from the combo box. The following SPI transfer modes are available: Write,

Read, Write/Read (simultaneous write and read).

b. Click the Run Speed Test button to run a short throughput test using the selected transfer mode or

click the Continuous checkbox and then click Run Speed Test to run a continuous throughput test.

Click Stop Speed Test to cancel a continuous throughput test.

c. Observe the throughput measurement in the SPI Throughput gauge.

Figure 6. Running SPI Throughput Tests

8a 8b

CP2130-EK

8 Rev. 0.2

9. Configure the general purpose input/output (GPIO) pins and read and write the pin latch values:

a. Select the GPIO pin mode from the Pin Config combo box. The following pin modes are available:

Input, Open Drain, or Push-Pull. When a GPIO pin is configured in Input mode, the latch value can

only be read and not written. When the GPIO pin is configured for Open Drain mode, the pin is either

weakly pulled up to VIO or driven low. When the GPIO pin is configured for Push-Pull mode, the pin is

driven either high or low.

b. Read the current state of the GPIO pin latch from the Logic Level text field.

c. Toggle the GPIO pin latch value by clicking the Drive High/Drive Low button. Clicking Drive High will

set the latch value to ‘1’. Clicking Drive Low will set the latch value to ‘0’. Observe the new latch value

by reading the Logic Level text field. By default, each GPIO pin is connected to an LED. Driving a

latch value of ‘0’ will turn the LED on. Driving a latch value of ‘1’ will turn the LED off.

Figure 7. Controlling GPIO Pins

CP2130-EK

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10. Write and read back a string to the external SPI EEPROM:

a. Enter a string into the Write text box. Click the Write button to write the string to the external EEPROM.

b. Click the Read button to read the string from the external EEPROM and display the string in the Read

text box.

Figure 8. Reading and Writing the SPI EEPROM

10a

10b

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10 Rev. 0.2

11. Use the CP2130 event counter feature to monitor push-button presses on the EVENT button which is

connected to GPIO.4 / CS4 / EVTCNTR:

a. Press the EVENT button on the CP2130 Evaluation Board. Notice that the Event Counter Counts

field updates to reflect the total number of button presses.

b. Click the Reset button in the application to clear the event count back to zero.

Figure 9. Monitoring Push-Button Presses Using the Event Counter

11a

11b

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