Кто нибудь писал имплементацию twi/i2c на usi для слейва? Опции

[AlexTech]

Поделитесь опытом плиз, слейв упорно ack отсылать не хочет :/

[alexeyv]

А debug-интерейс на Tiny, вы же ее отлаживаете?

например так:

Код

__interrupt void USI_Start_Condition_ISR(void)
{
    unsigned char tmpUSISR;                                         // Temporary variable to store volatile
    tmpUSISR = USISR;                                               // Not necessary, but prevents warnings
// Set default starting conditions for new TWI package
    USI_TWI_Overflow_State = USI_SLAVE_CHECK_ADDRESS;
    DDR_USI  &= ~(1<<PORT_USI_SDA);                                 // Set SDA as input
    while ( (PIN_USI & (1<<PORT_USI_SCL)) & !(tmpUSISR & (1<<USIPF)) );   // Wait for SCL to go low to ensure the "Start Condition" has completed.
                                                                       // If a Stop condition arises then leave the interrupt to prevent waiting forever.
    USICR   =   (1<<USISIE)|(1<<USIOIE)|                            // Enable Overflow and Start Condition Interrupt. (Keep StartCondInt to detect RESTART)
                (1<<USIWM1)|(1<<USIWM0)|                            // Set USI in Two-wire mode.
                (1<<USICS1)|(0<<USICS0)|(0<<USICLK)|                // Shift Register Clock Source = External, positive edge
                (0<<USITC);
    USISR  =    (1<<USI_START_COND_INT)|(1<<USIOIF)|(1<<USIPF)|(1<<USIDC)|      // Clear flags
                (0x0<<USICNT0);                                     // Set USI to sample 8 bits i.e. count 16 external pin toggles.
}