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AT91PS_TWI TWI = AT91C_BASE_TWI;
AT91F_TWI_CfgPMC(); // Enable Peripheral clock in PMC for TWI
AT91F_TWI_CfgPIO(); // Configure PIO controllers to drive TWI
TWI->TWI_CWGR = ((unsigned int) 0xFF << 0) // (TWI) Clock Low Div
| ((unsigned int) 0xFF << 8) // (TWI) Clock High Div
| ((unsigned int) 0x7 << 16); // (TWI) Clock Divider
TWI->TWI_MMR = AT91C_TWI_IADRSZ_1_BYTE |((unsigned int) 0x44 << 16);
TWI->TWI_IDR = (unsigned int) -1; // Disable interrupts
TWI->TWI_CR = AT91C_TWI_SWRST; // Reset peripheral
TWI->TWI_CR = AT91C_TWI_MSEN | AT91C_TWI_SVDIS; // Set Master mode
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