Silicon Laboratories Stepper Machine Manual de usuario descargar pdf (Pagina 28)

AN428

28 Rev. 0.6

// - The maximum SCL clock rate will be ~1/3 the Timer1 overflow rate

// - Timer1 enabled

void Timer1_Init (void)

{

// Make sure the Timer can produce the appropriate frequency in 8-bit mode

// Supported SMBus Frequencies range from 10kHz to 100kHz. The CKCON register

// settings may need to change for frequencies outside this range.

TMOD = 0x20; // Timer1 in 8-bit auto-reload mode

TH1 = 0xFF - (SYSCLK/SMB_FREQUENCY/3) + 1; // 100kHz or 400kHz for SCL

TL1 = TH1; // Init Timer1

TR1 = 1; // Timer1 enabled

}

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

// Timer2_Init

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

// Return Value : None

// Parameters : None

// Timer2 configured for SCL low timeout detection as

// follows:

// - Timer2 in 16-bit auto-reload mode

// - SYSCLK/12 as Timer2 clock source

void Timer2_Init (void)

{

TMR2CN = 0x00; // Timer2 configured for 16-bit auto-

// reload, low-byte interrupt disabled

// Timer2 uses SYSCLK/12 (see CKCON)

TMR2RLL = 0x5F;

TMR2RLH = 0x88;

TMR2L = TMR2RLL;

TMR2H = TMR2RLH;

TF2LEN = 0;

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 39 40

Sin comentarios

Silicon Laboratories Stepper Machine Manual de usuario Pagina 28