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Synchronized SPI communication

I am trying to implement interrupt based SPI communication between two Atmel microcontrollers. The data has to be transmitted from slave to master.

In master i continuously sends 0xff to the slave and master expects data from slave on each transfer.

char SPI_MasterTransfer(char cData) { uint8_t a; PORTB &= ~(_BV(PB4)); // Slave select a = SPDR; SPDR = cData; while(!(SPSR & (1

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Vivek B
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