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Olaf Rempel 9f3781a3eb Implement USI peripheral slave statemachine ...

- Implement a TWI slave using the USI peripheral found in AVR tiny MCUs
- using attiny85 as target (has no bootloader section!)
- USI peripheral in general needs clock stretching support from the
  master since the whole statemachine is software based.
  For now the actual writing to flash/eeprom is also done during
  clock stretching (like original twiboot implementation).
  This might be changed later.
- ACK/NAK handling is different:
  For TWI peripheral the ACK/NAK of the *next* byte has to be returned
  by TWI_data_write(). For USI peripheral the ACK/NAK of the *current*
  byte needs to be returned. For now the TWI version remains in the
  code and might be changed later.

2020-10-26 13:51:07 +01:00

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