Wiznet makers

How to Run Loopback Example

This project uses the Raspberry Pi Pico as the main controller to operate the W55RP20-S2E module. Connect to the W55RP20-S2E module via SPI or UART communication to implement TCP Client, TCP Server, and UDP Loopback functionality.

Step 1: Prepare Software

Download and install the following software:

Required Software:

• Arduino IDE
• Tera Term
• Hercules

Step 2: Hardware Connections

2.1 SPI Mode Connection

When controlling the W55RP20-S2E module via SPI, connect as follows:

2.2 UART Mode Connection

When controlling the W55RP20-S2E module via UART:

Step 3: Arduino IDE Setup

Install Board Support Package

1. Open Arduino IDE
2. Go to File → Preferences
3. Add the following to "Additional Boards Manager URLs": https://github.com/earlephilhower/arduino-pico/releases/download/global/package_rp2040_index.json
4. Go to Tools → Board → Boards Manager
5. Search for "Raspberry Pi Pico" and install Raspberry Pi Pico/RP2040 by Earle F. Philhower, III
6. Select Tools → Board → Raspberry Pi RP2040 Boards → Raspberry Pi Pico

Step 4: Code Examples

Each example provides a .ino file to upload to the Pico.

1. SPI Communication

• Loopback

     2. UART Communication

• Loopback

Step 5: Upload and Test

5.1 Select Raspberry Pi Pico

1. Go to Tools → Board → Raspberry Pi RP2040 Boards → Raspberry Pi Pico
2. Select Tools → Port → Choose your COM port

5.2 Upload Code

1. Open the desired example .ino file
2. Modify IP addresses and port numbers as needed

• TCP Server

  void setup() {
  ... 
  at_set("LI192.168.11.2"); // Local IP
  at_set("SM255.255.255.0");
  at_set("GW192.168.11.1");
  at_set("DS8.8.8.8");
  at_set("LP5000");         // Local port
  ...
  }

• TCP Client

void setup() {

...
  at_set("LI192.168.11.2"); // Local IP
  at_set("SM255.255.255.0");
  at_set("GW192.168.11.1");
  at_set("DS8.8.8.8");
  at_set("RH192.168.11.100"); // Remote host (server)
  at_set("RP5000");         // Remote port

...
}

• UDP

void setup() {
... 
  at_set("OP3");            // UDP mode
  at_set("LI192.168.11.2"); // Local IP
  at_set("SM255.255.255.0");
  at_set("GW192.168.11.1");
  at_set("DS8.8.8.8");
  at_set("LP5000");         // Local port
  at_set("RH192.168.11.100"); // Remote host for UDP echo
  at_set("RP5000");         // Remote port
  ...
}

3. Click Upload button or press Ctrl+U

4. Wait for upload to complete

5.3 Open Serial Monitor

1. Go to Tools → Serial Monitor
2. Set baud rate to 115200
3. Verify network information and connection status

Step 6: Testing with Hercules

TCP Client Test

Hercules Server Setup:

1. Launch Hercules
2. Select TCP Server tab
3. Port: 5000
4. Click Listen
5. Verify messages from Pico appear
6. Type response message and click Send

Expected Results:

• Hercules receives "W55RP20 S2E TCP Server Demo" message
• Serial Monitor displays Hercules response

TCP Server Test

Hercules Client Setup:

1. Launch Hercules
2. Select TCP Client tab
3. IP: 192.168.11.2 (Pico IP address)
4. Port: 5000
5. Click Connect
6. Type message (e.g., "W55RP20 S2E TCP Server Demo")
7. Click Send

Expected Results:

• Serial Monitor displays "W55RP20 S2E TCP Server Demo"
• Hercules receives echoed message

UDP Test

Hercules UDP Setup:

1. Launch Hercules
2. Select UDP tab
3. Module IP: 192.168.11.2
4. Module Port: 5000
5. Local Port: 5000 (or other available port)
6. Type message (e.g., "W55RP20 S2E TCP Server Demo")
7. Click Send

Expected Results:

• Serial Monitor displays "W55RP20 S2E TCP Server Demo"
• Hercules receives echoed packet