Silicon Laboratories Stepper Machine Manual do Utilizador descarregar pdf (Página 35)

AN428

Rev. 0.6 35

SMB_RW = WRITE; // Mark next transfer as a write

SMB_SENDWORDADDR = 1; // Send Word Address after Slave Address

SMB_RANDOMREAD = 0; // Do not send a START signal after

// the word address

SMB_ACKPOLL = 1; // Enable Acknowledge Polling (The ISR

// will automatically restart the

// transfer if the slave does not

// acknoledge its address.

// Specify the Outgoing Data

WORD_ADDR = addr; // Set the target address in the

// device's internal memory space

SMB_SINGLEBYTE_OUT = dat; // Store <dat> (local variable) in a

// global variable so the ISR can read

// it after this function exits

// The outgoing data pointer points to the <dat> variable

pSMB_DATA_OUT = &SMB_SINGLEBYTE_OUT;

SMB_DATA_LEN = 1; // Specify to ISR that the next transfer

// will contain one data byte

// Initiate SMBus Transfer

STA = 1;

}

//-----------------------------------------------------------------------------

// I2C_ByteRead

//-----------------------------------------------------------------------------

// Return Value :

// 1) unsigned char data - data read from address <addr> in the device

// range is full range of character: 0 to 255

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Silicon Laboratories Stepper Machine Manual do Utilizador Página 35