WIZnet WIZ550io Internet Radio

Let’s start the Internet radio project with WIZnet WIZ550io.

1. Block Diagram (main interface)

  • SPI1: WIZ550io
  • SPI2: VS1033D


  • Define the VS1033D & WIZ550io pin MAP

2. Schematic & Source code & Compiler

– Refer to as below site


– STM32board (open the Schematic)

– VS1033D Board $19.95 (https://www.sparkfun.com/products/10608)

– WIZ550io Board $17.00 (http://www.shopwiznet.com/wiz550io)

– Compiler: EmIDE (http://www.emide.org/)


3. Protocol Analytics

To connect the Radio channel, we should check protocol between Radio Server and Client board.

  • Step #1 In order to analytics the network Packet, you should execute packet capture tool such as WireShark (www.wireshark.com)
  • Step #2: Running the Explore and access the Radio Channel

    We’ll find as below web-page

    Click the Listen button. And then, the PC will play the MP3 player as like Gom!!!

  • Step #3 Packet analytics

    I omitted the Wireshark packet capture procedure. (Please find a google or YouTube)

    Anyway, the below image displayed TCP client (PC part) connection procedure

    • Client PC:
    • Server Radio channel IP:

  • Keep in mind, the Key packet is here “GET / HTTP/1.1″

    That means when TCP Client connection was finished, the PC (Client) will send as below packets.

Instead of Client board, I used PC and Client p/g as like the Hercules_3-2-4 (www.HW-group.com)

  • Test Radio Channel IP and port number

    IP / Port = 109, 206, 96, 11 / 80 (TOP FM Beograd 106,8 64-kpbs)


4. Source Code analytics

  • Total block diagram

  • Internet Radio TCP Client block Diagram

5. Implementation.

  • Initialize the WIZ550io and VS1033D SPI setting
    • VS1033D SPI Setting

    • WIZ550io SPI setting


  • main loop
/*********************************************************************** main()**********************************************************************/
void main(){
  // Host MCU initialize
  // WIZnet TCP/IP Chip initialize
  // Application code : DHCP Client
  // – DHCP IP allocation and check the DHCP lease time (for IP renewal)


  DHCP_Routine(); //DHCP init Check 
  VS1003_InitCheck();     //VS1033D init check 
  while (VS1003_Ready()==Bit_RESET) //VS1033D play to Ready check
    printf(“VS1003_Ready=Bit Reset1″);
  #ifdef MP3_DebuggingMP3_Test(); //Play the sample Music (5Sec)
  #endif while(1){
  // Application code : Loopback
  // TCP Server
  InternetRadio_tcpc(SOCK_RadioC, any_port);   //Internet Radio Play 

uint8 RadioRequest[]= { 0x47, 0x45, 0x54, 0x20, 0x2f, 0x20, 0x48, 0x54, 0x54, 0x50,0x2f, 0x31, 0x2e, 0x31, 0x0d, 0x0a, 0x41, 0x63, 0x63, 0x65,0x70, 0x74, 0x3a, 0x20, 0x2a, 0x2f, 0x2a, 0x0d, 0x0a, 0x49,0x63, 0x79, 0x2d, 0x4d, 0x65, 0x74, 0x61, 0x44, 0x61, 0x74,0x61, 0x3a, 0x31, 0x0d, 0x0a, 0x55, 0x73, 0x65, 0x72, 0x2d,0x41, 0x67, 0x65, 0x6e, 0x74, 0x3a, 0x20, 0x47, 0x4f, 0x47,0x53, 0x20, 0x48, 0x54, 0x54, 0x50, 0x20, 0x4d, 0x50, 0x45,0x47, 0x28, 0x47, 0x4f, 0x4d, 0x41, 0x29, 0x0d, 0x0a, 0x48,0x6f, 0x73, 0x74, 0x3a, 0x20, 0x75, 0x6b, 0x32, 0x2e, 0x69,0x6e, 0x74, 0x65, 0x72, 0x6e, 0x65, 0x74, 0x2d, 0x72, 0x61,0x64, 0x69, 0x6f, 0x2e, 0x63, 0x6f, 0x6d, 0x0d, 0x0a, 0x43,0x6f, 0x6e, 0x6e, 0x65, 0x63, 0x74, 0x69, 0x6f, 0x6e, 0x3a,0x20, 0x63, 0x6c, 0x6f, 0x73, 0x65, 0x0d, 0x0a, 0x0d, 0x0a};



Do you remember this packet?

Yes, this packet will be first sent to Radio Sever.

Please refer to ESTABLISED routine

ret = send(s, RadioRequest, sizeof(RadioRequest));


void InternetRadio_tcpc(uint8 s, uint16 port)
  int32_t ret;
  uint16 RSR_len;
  uint16 received_len;
  uint8 *data_buf = TX_BUF;
  uint16 sentsize=0, i=0;
  switch (getSn_SR(s))
    case SOCK_ESTABLISHED: /* if connection is established */

      printf(“\r\nConnected Socket: %d\r\n”,s);
    //printf(“\r\n RadioSocket_status=1\r\n”);
      ret = send(s, RadioRequest, sizeof(RadioRequest));
      printf(“\r\n Send RadioRequest protocol\r\n”);
      PadioSocket_status = 2;

    if ((RSR_len = getSn_RX_RSR(s)) > 0) /* check Rx data */
      if (RSR_len > DATA_BUF_SIZE) RSR_len = DATA_BUF_SIZE;
      received_len = recv(s, data_buf, RSR_len); /* read the received data */
      printf(“\r\n Receive Data Num %d”, received_len);
      sentsize =0;

      while(received_len != sentsize)
        while (VS1003_Ready()==Bit_SET)
        //printf(“\r\n VS1003 Data process start\r\n”);
          for (i=0; i<received_len; i++)
          sentsize += received_len;

          if (sentsize>=received_len) return;

    case SOCK_CLOSE_WAIT: /* If the client request to close */
      printf(“\r\n%d : CLOSE_WAIT”, s);
      if ((RSR_len = getSn_RX_RSR(s)) > 0) /* check Rx data */
        if (RSR_len > DATA_BUF_SIZE) RSR_len = DATA_BUF_SIZE;
        ret = received_len = recv(s, data_buf, RSR_len);
      RadioSocket_status = 0;

    case SOCK_CLOSED: /* if a socket is closed */
        printf(“\r\n%d : Loop-Back TCP Client Started. port: %d\r\n”, s, port);
        RadioSocket_status = 1;

      if(socket(s, Sn_MR_TCP, port++, 0x00) == 0) /* reinitialize the socket */
        printf(“\a%d : Fail to create socket.”,s);
        RadioSocket_status = 0;

    case SOCK_INIT: /* if a socket is initiated */
      connect(s, Dest_IP, Dest_PORT);





6. Conclusion

First of all, this project is Beta version. I didn’t allocate the memory for saving internet radio server data. Therefore, It’s not perfectly working all internet radio channel.

But, WIZ550io is very easy solution for Internet Radio.

First, It’s easy to be porting in STM32F103RBT code. I just add 5~10 lines for SPI mapping.

Second, I have used the TCP Client example code. This is also open WIZnet homepage. I just added VS1033 play routine in TCP Client.

Anyway, when you open my source code, you’ll find what I was meaning.

If you would like to do IoT project or easy network function, I would like to recommend a WIZnet solution.


7. Reference



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