Silicon Laboratories Stepper Machine Manual do Utilizador descarregar pdf (Página 27)

AN428

Rev. 0.6 27

// Return Value : None

// Parameters : None

// The SMBus peripheral is configured as follows:

// - SMBus enabled

// - Slave mode disabled

// - Timer1 used as clock source. The maximum SCL frequency will be

// approximately 1/3 the Timer1 overflow rate

// - Setup and hold time extensions enabled

// - Free and SCL low timeout detection enabled

void SMBus_Init (void)

{

SMB0CF = 0x5D; // Use Timer1 overflows as SMBus clock

// source;

// Disable slave mode;

// Enable setup & hold time extensions;

// Enable SMBus Free timeout detect;

// Enable SCL low timeout detect;

SMB0CF |= 0x80; // Enable SMBus;

}

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

// Timer1_Init

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

// Return Value : None

// Parameters : None

// Timer1 is configured as the SMBus clock source as follows:

// - Timer1 in 8-bit auto-reload mode

// - SYSCLK / 12 as Timer1 clock source

// - Timer1 overflow rate => 3 * SMB_FREQUENCY

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Silicon Laboratories Stepper Machine Manual do Utilizador Página 27