Silicon Laboratories Stepper Machine Manual do Utilizador descarregar pdf (Página 34)

AN428

34 Rev. 0.6

INTERRUPT(Timer2_ISR, INTERRUPT_TIMER2)

{

SMB0CF &= ~0x80; // Disable SMBus

SMB0CF |= 0x80; // Re-enable SMBus

TF2H = 0; // Clear Timer2 interrupt-pending flag

SMB_BUSY = 0; // Free bus

}

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

// Support Functions

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

// I2C_ByteWrite

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

// Return Value : None

// Parameters :

// 1) unsigned char addr - address to write in the device via I2C

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

// 2) unsigned char dat - data to write to the address <addr> in the device

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

// This function writes the value in <dat> to location <addr> in the device

// then polls the device until the write is complete.

void I2C_ByteWrite (U8 addr, U8 dat)

{

while (SMB_BUSY); // Wait for SMBus to be free.

SMB_BUSY = 1; // Claim SMBus (set to busy)

// Set SMBus ISR parameters

TARGET = SLAVE_ADDR << 1; // Set target slave address

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Silicon Laboratories Stepper Machine Manual do Utilizador Página 34