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I2C commercial slave library addon

 
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Carlos

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Joined: 16 Mar 2006
Posts: 19

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PostPosted: Sun Oct 19, 2014 9:15 am    Post subject: I2C commercial slave library addon Reply with quote

Hello,

I work with the commercial I2C slave library addon.

Code:
comment   = BASCOM-AVR USI I2C slave library
libversion   = 2.0.7.7
date         = 8 Jan 2014
 

This configuration works well - the Master sends with 'I2creceive" 2 Bytes to the Slave and receives an amount of A bytes in reply.

Code:
                     Master                               Slave
Derivate:        ATMega1284                      ATMega8
I2C-Lib:          Lib "I2C_TWI.LBX"        
Transmit/Rec:  I2creceive Slave_ad,         Config Twislave = &H70 , Btr = A , Bitrate = 100000          
                        Buf(1) , 2 , A        
 

This configuration doesn't work so well, when A > 2:
The Master sends with 'I2creceive" 2 Bytes to the Slave and receives 2 Bytes in reply.
But when A>2 then the Slave only send 2 Bytes - no more!
Where can I configure that the Slave sends more than 2 Bytes to the Master?
In the previous configuration I can define how many Bytes the Slave sends to the Master with Btr=A.

Code:
                     Master                               Slave
Derivate:        ATMega1284                      ATTiny2313
I2C-Lib:          Lib "I2C_TWI.LBX"        
Transmit/Rec:  I2creceive Slave_ad,         config USI = twislave , address = &H70
                        Buf(1) , 2 , A        
 

But that doesn't seem to work here. Does anyone have any Ideas what to change to receive more than 2 bytes?

best greatings,
Ernst

(BASCOM-AVR version : 2.0.7.7 )
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i.dobson

Bascom Expert



Joined: 05 Jan 2006
Posts: 1542
Location: Basel, Switzerland

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PostPosted: Sun Oct 19, 2014 10:32 am    Post subject: Reply with quote

Hi,

I also use the i2cslave lib and in my configuration the master can send between 1 and 32 Bytes. I solved it by just Setting the Bytes received to > 32 Bytes and using the i2cstop isr to decide what to do with the data recieved, if the data is a Multi Byte command or the first Byte received if the command is a single Byte.

something like:-
Code:

Twi_stop_rstart_received:                                   'Single byte commands
  Select Case I2c_command                                   'En/Dis RFID Reader
    Case Is = _rfid_dis
      Reset Rfid_enable                                     'Disable RFID reader
      I2c_command = 0
    Case Is = _rfid_en
      Set Rfid_enable                                       'Enable RFID Reader
      I2c_command = 0
    Case Is = _rfid_clear                                   'Clear RFID Nr
      Rfid_number = 0
      I2c_command = 0
      '    Case Is = _reset                                        'Reboot uC
      '      Reboot_uc = 1
      '      I2c_command = 0
    Case Is = _firmware_update                              'Firmware update command
      Firmware_update = 1
      I2c_command = 0
  End Select
return

Twi_gotdata:
  If Twi_btw = 1 Then                                       'First byte written is command
    I2c_command = Twi
  Else
    I2c_recieved(twi_btw) = Twi
  End If
  If I2c_command = _irda_send And Twi_btr = _i2c_packet_size_receive Then
    Isr_temp = Memcopy(i2c_recieved(2) , Irda_send(1) , _i2c_packet_size_receive )
    I2c_command = 0
  End If
return

Twi_master_needs_byte:
  Select Case I2c_command
    Case Is = _read_rfid
      Twi = Rfid_number_array(twi_btr )                     'Return RFID byte
      If Twi_btr = _i2c_packet_size_rfid Then
        I2c_command = 0
      End If
    Case Is = _irda_rec
      Twi = Irda_rec(twi_btr )                              'Return IRDA byte           '
      If Twi_btr = _i2c_packet_size_send Then
        I2c_command = 0
      End If
    Case Is = _version
      Twi = _myversion
      I2c_command = 0
    Case Else                                               'Send 00 if things
      Twi = &H00                                            'are screwed up
  End Select
return
 


regards
Ian Dobson

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Carlos

Bascom Member



Joined: 16 Mar 2006
Posts: 19

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PostPosted: Sun Oct 19, 2014 12:18 pm    Post subject: Reply with quote

thank you Ian,

but that was not the question.
If the Master works with "I2C_TWI.LBX" and Slave works also Twislave than the communication is o.k.

But when the Slave works with "I2c_USI_Slave.Lib" (Attiny2313) then the Slaves givs only 2 correct
Byes back, tha other bytes are not true!

the master sends:
I2creceive Slave_ad, Buf(1) , 2 , A

how can I set the number of bytes(A) , which then sends the slave back to the Master?
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Carlos

Bascom Member



Joined: 16 Mar 2006
Posts: 19

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PostPosted: Tue Oct 21, 2014 5:36 pm    Post subject: Reply with quote

Mark has created a new update.
I have tested it. Now it is running.
The new update for the i2c package will be provided by Mark this week for general usage.

problem solved

Best greatings,
Ernst
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