Getting started with Arduino and WIZ820io

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Used Hardware:

To get started an Arduino Duemilanove board is used with an Arduino prototyping shield and prototyping jump wires.

To get the 3.3V for the WIZ820io power supply an voltage regulator is needed to transform the 5V from the Arduino board to 3.3V.

(The maximum current draw from FTDI chip on the Arduino Duemilanove is max. 50mA and therefore not usable to power the WIZ820io)


Used Bootloader:

You can use the Arduino bootloader but in this example an AVRISP MKII is used to flash an Bascom-AVR Bootloader.

For this you need an AVRISP MKII and AVR Studio to flash the bootloader on the Atmega328P on the Arduino.


Following you can find the Bootloader written in Bascom-AVR:

$crystal = 16000000                              'Arduino is running at 16MHz
$baud = 57600                                     '57600 Baud
$timeout = 900000
 
$regfile = "m328pdef.dat"
$loader = $3c00                                   'sets the bootsize to 1024 words under flash size
Const Pagemsb = 6                                 '64 words in a page reguires 6 bits
 
Config Com1 = Dummy , Synchrone = 0 , Parity = None , Stopbits = 1 , Databits = 8 , Clockpol = 0
 
Dim Retries As Byte
Dim Receivedbyte As Byte
Dim Kindofdata As Byte
Dim Spmcsrvalue As Byte
Dim Calculatedchecksum As Byte
Dim Receivedblock As Byte
Dim Countedblock As Byte
Dim Invertedblock As Byte
Dim Receivedchecksum As Byte
Dim Receivedbytes(128) As Byte
Dim J As Byte
Dim Vl As Byte
Dim Vh As Byte
Dim Wrd As Word
Dim Page As Word
Dim Z As Long
 
Disable Interrupts
 
Const Maxword =(2 ^ Pagemsb) * 2
Const Zpagemsb = Pagemsb + 1
Const Soh = &H01
Const Stx = &H02
Const Eot = &H04
Const Ack = &H06
Const Nak = &H15
Const Can = &H18
 
Retries = 5
Testformagicbyte:
Receivedbyte = Waitkey()
Print Chr(receivedbyte);
If Receivedbyte = 123 Then
  Kindofdata = 0
  Goto Loader
Elseif Receivedbyte = 124 Then
  Kindofdata = 1
  Goto Loader
Elseif Receivedbyte <> 0 Then
  Decr Retries
  If Retries <> 0 Then Goto Testformagicbyte
End If
Goto _reset
 
Loader:
Do
  Receivedbyte = Waitkey()
Loop Until Receivedbyte = 0
 
If Kindofdata = 0 Then
  Spmcsrvalue = 3 : Gosub Do_spm
  Spmcsrvalue = 17 : Gosub Do_spm
End If
Retries = 10
 
Do
  Calculatedchecksum = 0
  Print Chr(nak);
  Do
    Receivedbyte = Waitkey()
    Select Case Receivedbyte
    Case &H01:                                    '<SOH>
      Incr Countedblock
      Calculatedchecksum = 1
      Receivedblock = Waitkey()
      Calculatedchecksum = Calculatedchecksum + Receivedblock
      Invertedblock = Waitkey()
      Calculatedchecksum = Calculatedchecksum + Invertedblock
      For J = 1 To 128
        Receivedbytes(j) = Waitkey()
        Calculatedchecksum = Calculatedchecksum + Receivedbytes(j)
      Next
      Receivedchecksum = Waitkey()
      If Countedblock = Receivedblock Then
        If Receivedchecksum = Calculatedchecksum Then
          Gosub Writepage
          Print Chr(ack);
        Else
          Print Chr(nak);
        End If
      Else
        Print Chr(nak);
      End If
    Case &H04:                                    '<EOT>
      If Wrd > 0 And Kindofdata = 0 Then
        Wrd = 0
        Spmcsrvalue = 5 : Gosub Do_spm
        Spmcsrvalue = 17 : Gosub Do_spm
      End If
      Print Chr(ack);
      Waitms 20
      Goto _reset
    Case &H18:                                    '<CAN>
      Goto _reset
    Case Else
      Exit Do
    End Select
  Loop
 
  If Retries > 0 Then
    Waitms 1000
    Decr Retries
  Else
    Goto _reset
  End If
Loop
 
Writepage:
If Kindofdata = 0 Then
  For J = 1 To 128 Step 2
    Vl = Receivedbytes(j)
    Vh = Receivedbytes(j + 1)
    lds r0, {vl}
    lds r1, {vh}
    Spmcsrvalue = 1 : Gosub Do_spm
    Wrd = Wrd + 2
    If Wrd = Maxword Then
      Wrd = 0
      Spmcsrvalue = 5 : Gosub Do_spm
      Spmcsrvalue = 17 : Gosub Do_spm
      Page = Page + 1
      Spmcsrvalue = 3 : Gosub Do_spm
      Spmcsrvalue = 17 : Gosub Do_spm
    End If
  Next
Else
  For J = 1 To 128
    Writeeeprom Receivedbytes(j) , Wrd
    Wrd = Wrd + 1
  Next
End If
Return
 
Do_spm:
  Bitwait Spmcsr.0 , Reset
  Bitwait Eecr.1 , Reset
  Z = Page
  Shift Z , Left , Zpagemsb
  Z = Z + Wrd
  lds r30, {Z}
  lds r31, {Z + 1}
  #if _romsize > 65536
    lds r24, {Z + 2}
    sts rampz, r24
  #endif
  Spmcsr = Spmcsrvalue
  spm
  nop
  nop
Return
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