Silicon Laboratories Stepper Machine Manual do Utilizador descarregar pdf (Página 25)

AN428

Rev. 0.6 25

// since the mask is all ones

I2C_ByteWrite(curr.Reg_Addr, curr.Reg_Val);

} else {

//do a read-modify-write

curr_chip_val = I2C_ByteRead(curr.Reg_Addr);

clear_curr_val = curr_chip_val & ~curr.Reg_Mask;

clear_new_val = curr.Reg_Val & curr.Reg_Mask;

combined = clear_new_val | clear_curr_val;

I2C_ByteWrite(curr.Reg_Addr, combined);

}

// check LOS alarm for the xtal input

// on IN1 and IN2 (and IN3 if necessary) -

// change this mask if using inputs on IN4, IN5, IN6

reg = I2C_ByteRead(218) & LOS_MASK;

while(reg != 0){

reg = I2C_ByteRead(218) & LOS_MASK;

}

I2C_ByteWrite(49, I2C_ByteRead(49) & 0x7F); //FCAL_OVRD_EN = 0

I2C_ByteWrite(246, 2); //soft reset

I2C_ByteWrite(241, 0x65); //DIS_LOL = 0

// wait for Si5338 to be ready after calibration (ie, soft reset)

counter = 0;

while(counter < SI5338_DELAY) { counter++; }

counter = 0;

while(counter < SI5338_DELAY) { counter++; }

//make sure the device locked by checking PLL_LOL and SYS_CAL

reg = I2C_ByteRead(218) & LOCK_MASK;

while(reg != 0){

reg = I2C_ByteRead(218) & LOCK_MASK;

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Silicon Laboratories Stepper Machine Manual do Utilizador Página 25