TWI slave transmit on AVR seemd not to work (R1436@WIN10)

So, after long time I might found another issue / missing base functionality: It seems, that the slave transmit for TWI on AVR does push the TWI data register correctly onto the SDA line.

Situation:

• two 328mega are connected via TWI (with 10kOhm Pullups)
  
  • Master and its Uart / Mcu Monitor on the right.
    
  • Slave and its Uart / Mcu Monitor on the left.
    
  
  
  
• Master sends data to slave (address 0x80).
  
  • Slave can read it and prints it on UART.
    
  • signal in Master TWDR, Slave TWDR and SDA is correct
    
  
  
  
• Master sends request for data to slave (address 0x81).
  
  • Slave gets TWSR = 0xA8: "Own SLA+R has been received; ACK has been returned"
    (video 9:17)
    
  • Slave set TWDR = 0x63
    (video 9:28)
    
  • Slave get into state TWSR = 0xB8: "Data byte in TWDR has been transmitted; ACK has been received"
    (video 12:23)
    
  • data on SDA line = 0x00 , not like TWDR = 0x63 ...
    
  
  
  

Sources:

• c code, hex and simu: here
  
• Video (shows also the PCs of both AVRs, speed slowed down to see single steps)
  
  

The code stems from here and uses Peter Fleurys TWI Lib.

Which code is the slave executing? "Slave test program" or "Slave source code"

Both. "slave source Code" is the lib twislave.c/h and the other one the implementation of the lib in a main function.

Hopefully solved at trunk Rev 1448.

Thanks for the Fast response.
Could you make a test build out of it? Then I would check it