_ATTR_DRIVER_CODE_
BOOL TimerPeriodSet( UINT32 usTick, uint32 nsTick)
{
UINT32 count,Pclk;
BOOL Retval = TRUE;
TimerusTickBak = usTick;
TimernsTickBak = nsTick;
Pclk = GetPclkFreq();
count = (Pclk * usTick + Pclk * nsTick / 1000)/1000;
if(count > 0x00ffffff)
{
count = 0x00ffffff;
Retval = FALSE;
}
/* Disable the timer ,usermode,mask*/
TimerDisable();
Timer->ControlReg |= TIMR_USER_MODE;
Timer->LoadCountRegister = count;
/* free mode and enable the timer £¬not mask*/
TimerEnable();
return Retval;
}
/*
--------------------------------------------------------------------------------
Function name : I2CSetSpeed(UINT16 speed)
Author : yangwenjie
Description :
Input : speed -- unit is k,for example 400 is mean 400k
Return :TRUE -- success
FALSE -- failure
History: <author> <time> <version>
yangwenjie 2009-1-14 Ver1.0
desc: ORG
--------------------------------------------------------------------------------
*/
BOOL I2CSetSpeed(eI2C_CHANNEL i2cPort,UINT16 speed)
{
UINT32 exp;
UINT32 rem;
UINT32 scalespeed;
UINT32 freqbase;
I2CReg_t * pReg;
pReg = I2CPORT(i2cPort);
pReg->I2C_OPR &= ~( I2C_OPR_ENABLE);
freqbase = (GetPclkFreq()*1000) / 5;//by YWJ 04.19
scalespeed = speed << 3; // speed以K为单位 (rem+1)<=8 ,先以8来确定exp
for (exp = 0;exp < 7;exp++)
{
scalespeed = scalespeed << 1;
if (scalespeed > freqbase)
{
break;
}
}
rem = (freqbase) / speed / (1 << (exp + 1))/* - 1*/;
pReg->I2C_OPR &= ~(I2C_OPR_DIV_SPEED_MASK);
pReg->I2C_OPR |= ((rem << 3) | exp);
pReg->I2C_OPR |= I2C_OPR_ENABLE;
return TRUE;
}
