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Porting the AN2120/D UDP/IP Code to the Avnet Evaluation Board

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Porting the AN2120/D UDP/IP Code to the Avnet Evaluation Board Freescale Semiconductor, Inc. Engineering Bulletin EB390/D 5/2002 Porting the AN2120/D UDP/IP Code to the Avnet Evaluation Board By: Steven Torres . Motorola . SPS TSPG 8-/16-Bit Division c n I , Introduction r o t The Motorola application note Connecting an M68HC08 Family Microcontroller c to an Internet Service Provider (ISP) Using the Point-to-Point Protocol u (AN2120/D) describes a methodology for connecting a Motorola d microcontroller to the Internet using the PPP protocol to exchange UDP/IP n data. UDP/IP (user datagram protocol/Internet protocol) is similar to TCP/IP, o except that being a connectionless protocol, it sends messages to a host c i without establishing a connection. m AN2120/D also includes the code that implements a UDP/IP protocol. This e code was first developed using the Cosmic development environment. Since S then, the UDP/IP code has been ported to Metrowerks CodeWarrior 1 e development environment and onto the 68HC908GP32 Avnet evaluation l board. a c The UDP/IP methodology provides a mechanism to allow a remote device, in s this case an M68HC08 Family microcontroller, to connect to an ISP. When the e remote device has established a connection with the ISP, the remote device e r can broadcast data to other hosts on the Internet. The UDP/IP network F connectivity is illustrated in Figure 1. 1. CodeWarrior is a registered trademark of Metrowerks, a Motorola company. © Motorola, Inc., 2002 For More Information On This Product, Go to: www.freescale.com Freescale Semiconductor, Inc. EB390/D BACKBONE ROUTER MC68HC908GP32 SYSTEM MODEM INTERNET POINT-TO-POINT CONNECTION ROUTER OF LOCAL ISP . c n I , DESTINATION HOST r o Figure 1. Network Framework t c Porting Overview This engineering bulletin describes the porting of the UDP/IP CodeWarrior u code to the Avnet evaluation board. The information provided in subsequent d n sections is organized as a guide to connecting Motorola microcontrollers to the o Internet using the UDP/IP code. c i The demo’s objectives are: m • Connecting an Avnet evaluation board running a CodeWarrior version of e the UDP/IP code on its MC68HC908GP32 MCU to a dial-up server S through a PPP link e • Demonstrating how an ActiveX component can be used as a l destination host to interface with the device running the UDP/IP code a through a dial-up server c s NOTE: This engineering bulletin does not detail the SLIP connection already described e in AN2120/D. e r In subsequent sections, this engineering bulletin describes: F • The Avnet evaluation board hardware • UDP/IP CodeWarrior code modifications that are required for the demo • How to organize, set up, and configure a network to be compatible with a PPP connection • Setting up an ActiveX interface on the destination host to interface with the remote device • Some techniques and tools for debugging an Internet connection between an MCU and a destination host 2 Porting the AN2120 Code to the Avnet Evaluation Board MOTOROLA For More Information On This Product, Go to: www.freescale.com Freescale Semiconductor, Inc. EB390/D Avnet Evaluation Board Setup While this engineering bulletin details using a dial-up server and a subnet to connect a device to a remote host, the UDP/IP code is not limited to this type of connectivity. Variations to this implementation are possible with the correct setup. Application note AN2120/D describes a device, for example, that connects to an ISP, which then allows the device to reach a destination host across the Internet. Demo Development As discussed above, the UDP/IP code can be modified and compiled within the Environment CodeWarrior environment. To program the Avnet evaluation board, the P&E FLASH Programmer can be used. The networking part of the demo was developed and tested using an . . IBM-compatible PC running these Microsoft programs1: c n • Windows 98 SE I • FrontPage 2000 , r • Internet Explorer 5.5 o t • Dial-Up Networking c • Dial-Up Server u d • Winsock version 6 ActiveX component n o The Windows networking setup described below should also be compatible c with Windows 95, 98, NT , and 2000. i m e Avnet Evaluation Board Setup S e Before setting up and configuring the network for the demo, the Avnet board l must be modified to be compatible with the application note AN2120/D a c hardware requirements. In addition, the Avnet board must also be configured s with the correct clock and PLL settings for the demo by setting some jumpers e and switches on the board. e r F 1. Microsoft, Windows, Frontpage, ActiveX, and NT are registered trademarks of Microsoft Corporation in the United States and/or other countries. MOTOROLA Porting the AN2120 Code to the Avnet Evaluation Board 3 For More Information On This Product, Go to: www.freescale.com Freescale Semiconductor, Inc. EB390/D Avnet Evaluation Modifications to the Avnet evaluation board are required so that the Avnet Board Modifications evaluation board will be wired as dictated by application note AN2120/D — see the serial port schematic Figure 2 for the AN2120/D hardware requirements. This schematic can also be found on page 46 of the application note AN2120/D. These wiring requirements are a consequence of the coding of the UDP/IP protocol. U2 MAX220 1 16 C1+ V C5 CC C7 0.1 µF 3 2 0.1 µF C1– V+ 4 6 C2+ V– C8 C6 0.1 µF P1 . µ 0.1 F 5 15 5 . C2– GND 9 . GND 11 14 4 T1In T1Out 8 c 12 R1 R2 8 3 Out In 7 n 9 T2 7 2 I R2Out Out 6 10 R1 13 1 , T2In In r CONNECTOR o DB9 t Figure 2. AN2120/D Serial Port Schematic c u d n Comparing the AN2120/D schematic to the schematic for an Avnet evaluation o board, it is evident that the Avnet board lacks two serial port hardware-wiring c connections. (See Figure 3 below. Please reference the Avnet i ADS-MOT908GP32 for more detailed schematics.) Table 1 summarizes the m schematic observations. The table shows that the unmodified Avnet board e lacks CD and DTR signals. S e l V U1 CC a ADM202 CONNECTOR DB9 c P1 16 15 5 s C1 1 VCC GND 1 9 e µ C2 4 0.1 F 2 2 2 8 6 0.1 µF V+ V– e 3 7 r 1 C1P C2+ 4 2 1 1 C4 6 F C3 0.1 µF 1 0.1 µF 2 3 5 2 C1– C2– CONNECTOR DB9 11 14 P2 T1In T1Out 5 9 PTE0 10 7 4 T2In T2Out 8 3 12 13 7 R1Out R1In 2 6 PTE1 9 8 1 R2Out R2In Figure 3. Avnet Serial Ports Schematic 4 Porting the AN2120 Code to the Avnet Evaluation Board MOTOROLA For More Information On This Product, Go to: www.freescale.com Freescale Semiconductor, Inc. EB390/D Avnet Evaluation Board Setup Table 1. Serial Port Wiring Pin AN2120/D Unmodified Modified Pin Description Requirements Avnet Avnet 3 Rx (= R2) PTE1 PTE1 PTE1 2 Tx (= T2) PTE0 PTE0 PTE0 1 CD (= R1) PTD1 Lacking PTD1 4 DTR (= T1) PTD0 Lacking PTA0 . Table 1 also shows the required signal-to-port serial communication wiring . modifying the Avnet board. The modifications are described in more detail c below. Item 1 resolves the carrier detect (CD) wiring requirements; Item 2 n resolves the data terminal ready (DTR) requirements. Layout schematics of an I unmodified and a modified Avnet board are provided in Figure 4 and Figure 5, , r respectively. o t Modifications: c u 1. Jumpered user interface pin PTD1 (that is Avnet board JP1 pin 9) to d resistor/diode clamp to the Avnet user serial port (PT2) pin 1 n 2. Jumpered the Avnet monitor mode serial port (PT1) pin 2 to the Avnet o user serial port (PT2) pin 4 c i NOTE: The item 2 modification, the DTR resolution, uses a different signal wire than m expected by the UDP/IP code (PTA0 instead of PTD0) and will dictate a e modification in the UDP/IP code. This modification is described in the section S entitled UDP/IP CodeWarrior Code Modifications. e l a c s e e r F MOTOROLA Porting the AN2120 Code to the Avnet Evaluation Board 5 For More Information On This Product, Go to: www.freescale.com Freescale Semiconductor, Inc. EB390/D POT POWER LED LCD CONTRAST DS2 POWER DIP LCD CHARACTER DISPLAY SWITCH JACK SPSI 1 x 16 10 pos LED TEMP SENSOR 1 DS1 JP3 JP1 1 . HC908GP32 . J2 . J1 c SW4 SW1 SW2 DB9 FEMALE DB9 FEMALE 1 A0/MMODE SCOISER n I RESET , SPEAKER OUTPUT r Note: This drawing shows general placement only and is not meant as a mechanical representation of the o actual board. t c Figure 4. Unmodified Avnet Board Layout u d POT n POWER LED o LCD CONTRAST c DS2 i POWER DIP LCD CHARACTER DISPLAY SWITCH JACK m SPSI 1 x 16 e 10 pos S e LED l TEMP a SENSOR 1 DS1 JP3 c JP1 s 1 e HC908GP32 PIN 2 PIN 1 PIN 4 J2 e r J1 SW4 SW1 SW2 DB9 FEMALE DB9 FEMALE F 1 A0/MMODE SCOISER RESET SPEAKER OUTPUT PT1 PT2 +5 V 100 kΩ Note: This drawing shows general placement only and is not meant as a mechanical representation of the actual board. Figure 5. Modified Avnet Board Layout 6 Porting the AN2120 Code to the Avnet Evaluation Board MOTOROLA For More Information On This Product, Go to: www.freescale.com Freescale Semiconductor, Inc.
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