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1300 Henley Court Pullman, WA 99163 509.334.6306 www.digilentinc.com chipKIT™ WiFi Shield™ Reference Manual Revised January 23, 2014 This manual applies to the chipKIT WiFi Shield rev. C Overview The chipKIT WiFi Shield is designed for use with Digilent's growing line of chipKIT microcontroller boards such as the Uno32™, uC32™, WF32™, or Max32™. The chipKIT line of microcontroller boards is based on the highperformance Microchip® PIC32 microcontrollers. The WiFi Shield gives chipKIT microcontroller boards the ability to connect to and communicate with IEEE 802.11compatible wireless networks. It is intended to be used with the Digilent network libraries DNETcK and DWIFIcK, available at www.digilentinc.com in file DSD-0000318. The WiFi Shield provides a microSD card connector. The chipKIT MPIDE SD library can be used to read and write files on microSD cards. Early versions of the WiFi Shield use the Microchip MRF24WB0MA WiFi module. Later versions use the improved MRF24WG0MA WiFi module. Features include: • • • • • • • • An IEEE 802.11b/g-compliant RF transceiver. A serialized unique MAC address. Peak data rates up to 2Mbps for 802.11b and 54Mbps for 802.11g . Open security, WEP, WPA-PSK, and WPA2-PSK security. An integrated PCB antenna. Radio regulation certification for the United States (FCC), Canada (IC), and Europe (ETSI). A micro SD card connector. Four user-accessible LEDs. The chipKIT WiFi Shield with MRF24WB0MA. DOC#: 502-231 Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners. Page 1 of 4 chipKIT™ WiFi Shield™ Reference Manual 1 Functional Description The WiFi Shield supports IEEE 802.11b/g/n networks and is designed for use with chipKIT and chipKIT-compatible microcontroller boards. The first version of the WiFi Shield uses the Microchip MRF24WB0MA WiFi module. This module supports IEEE 802.11b networks at 1 and 2 Mbps data rates. Later productions versions of the WiFi Shield use the improved Microchip MRF24WG0MA module. This module provides IEEE 802.11b/g support for embedded applications at data rates of 1 or 2 Mbps for 802.11b or 6, 9, 12, 18, 24, 36, 48, and 54 Mbps for 802.11g. The production version of the board can be determined by reading the part number of the MRF24Wx0MA module from the sticker (on the B module) or engraved on the metal shield (on the G module.) The WiFi Shield is intended to be used with the Digilent network libraries DNETcK and DWIFIcK, available at www.digilentinc.com. The libraries use the chipKIT MPIDE development environment and contain Microchip Applications Library code licensed from Microchip. To use the WiFi Shield outside of the MPIDE development environment, use the Microchip Applications Library, available from www.microchip.com, as a starting point to create custom library code. The WiFi Shield has a microSD card connector and four discrete LEDs. The card connector uses the chipKIT MPIDE SD library to access files on a microSD-size flash memory card. The LEDs are connected to four digital I/O pins on the chipKIT microcontroller board and can be accessed using the pinMode() and digitalWrite() functions in the MPIDE software. For more information, see the chipKit WiFi Shield schematic at www.digilentinc.com. 2 802.11b/g Interface The 802.11b/g compatible WiFi interface on the chipKIT WiFi Shield is provided by a Microchip MRF24Wx0MA WiFi module. This module provides the radio transceiver, antenna, and 802.11-compatible network firmware. The MRF24Wx0MA firmware provides the 802.11 network protocol software support. The DNETcK and DWIFIcK libraries provide the TCP/IP network protocol support that works with the 802.11 protocol support provided by the WiFi module. The primary communications interface with the WiFi module is a 4-wire SPI bus. The MRF24Wx0MA WiFi module supports SPI clock speeds up to 10MHz. An active low RESET signal can be used to reset the WiFi module, and an external interrupt signal, INT, is used by the module to signal to the host microcontroller that it needs servicing by the microcontroller software. The MRF24Wx0MA provides the following additional control signals: HIBERNATE (recommended for the G module only), RESET, and INT. For detailed information on the MRF24Wx0MA, see the data sheet at www.microchip.com. Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners. Page 2 of 4 chipKIT™ WiFi Shield™ Reference Manual 3 SD Card Interface The microSD card connector lets you access data stored on microSD-sized cards. SD memory cards are accessed via the same SPI bus used to access the WiFi module. The SD card uses a separate select line from that used by the WiFi module to enable API access to the SD card. The chipKIT MPIDE SD library is used to access files stored on the card. 4 Library Software The WiFi Shield is intended for use with the Digilent chipKIT network libraries DNETcK and DWIFIcK. The DNETcK library provides TCP/IP and UDP/IP protocol support for all chipKIT-compatible network interfaces supported by Digilent products. The DWIFIcK library provides the additional library support required for connecting to and operating with the Microchip MRF24Wx0MA wireless network modules. The DWIFIcK library supports both the MRF24WB0MA and MRF24WG0MA modules. The correct header file must be used for the version of the module on the WiFi Shield. When using a WiFi Shield with the MRF24WB0MA module, use the following: #include When using a WiFi Shield with the MRF24WG0MA module, use the following: #include The chipKIT network libraries are available from the www.digilentinc.com in file DSD-0000318. The file includes reference examples demonstrating the use of the libraries. More extensive examples are available for download as well. uC32/Uno32 Pin # 2 3 4 5 6 9 10 11 12 13 34 35 36 Max32 Pin # 2 3 4 5 6 9 10 11 12 13 78 79 80 Connector Pin # J2-05 J2-07 J2-09 J2-11 J2-13 J1-03 J5-05 J5-04 J5-01 J5-03 J1-02 J1-04 J1-06 Signal INT – external interrupt from MRF24WB0MA LED1 SDCS – SPI select for SD card LED2 LED3 LED4 CS – SPI select for MRF24Wx0MA MOSI – data in (SDI) for MRF24Wx0MA and SD card MISO – data out (SDO) for MRF24Wx0MA and SD card SCK – SPI clock for MRF24Wx0MA and SD card HIBERNATE WP RESET Table 1. Signal pin assignments. Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners. Page 3 of 4 chipKIT™ WiFi Shield™ Reference Manual Declaration of Conformity In accordance with EN ISO/IEC 17050-1:2010 Manufacturers Name: Digilent, Inc. Manufacturers Address: 1300 NE Henley Court Pullman, WA 99163 U.S.A. Application of Council Directives: Low Voltage 2006/95/EC EMC 2004/108/EC Standards: EMC EN55022:2010 EN55024:2010 Safety IEC 60950-1:2005 EN 60950-1:2006 Product Name: chipKIT WiFi Shield Product Model Number: Digilent P/N 210-231 Digilent Product Category: Serial Peripheral Devices We, the undersigned, hereby declare that the equipment specified above conforms to the above Directives and Standards. Location: _Pullman, WA______ Signature: Date: _June 18, 2012_____ Full Name (print): Clint Cole Title: Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners. Clint Cole__________ President___________ Page 4 of 4