////////////////////////////////////////////////////////////////////////////////
//! \brief Transfers the  power source from battery to 5V.
//!
//! \fntype Function
//!
//! This function handles the transitions on each of the power rails necessary
//! to power the chip from the 5V power supply when it was previously powered
//! from the battery power supply.
//!
////////////////////////////////////////////////////////////////////////////////
void ddi_power_ExecuteBatteryTo5VoltsHandoff(void)
{


    //----------------------------------------------------------------------
    // Start the 4p2 rail and power DCDC from it.
    //----------------------------------------------------------------------
    if(ddi_power_Is4p2Enabled())
    {
        ddi_power_Start4p2();
        return;
    }


    //--------------------------------------------------------------------------
    // We are about to power the chip solely from 5V, and possibly without
    // handoffs enabled.  We need to make sure the chip shuts down properly
    // if 5V is removed in this window.
    //--------------------------------------------------------------------------
    hw_power_Enable5vBrownoutPowerdown( true );

    hw_power_SetVdddPowerSource(HW_POWER_LINREG_DCDC_READY);

    hw_power_SetVddaPowerSource(HW_POWER_LINREG_DCDC_READY);
    hw_power_SetVddioPowerSource(HW_POWER_LINREG_DCDC_READY);

    //----------------------------------------------------------------------
    // Disable the DCDC during 5V connections.
    //----------------------------------------------------------------------
    hw_power_EnableDcdc(false);

}
////////////////////////////////////////////////////////////////////////////////
//! \brief Enable battery-to-5V handoff
//!
//! \fntype Function
//!
//! This function sets up battery-to-5V handoff. The power switch from
//! battery to 5V is automatic. This funtion enables the 5V present detection
//! such that the 5V interrupt can be generated if it is enabled. (The interrupt
//! handler can inform software the 5V present event.) To deal with noise or
//! a high current, this function enables DCDC1/2 based on the battery mode.
//!
////////////////////////////////////////////////////////////////////////////////
void ddi_power_EnableBatteryTo5VoltsHandoff(void)
{
    //--------------------------------------------------------------------------
    // Enable 5V plug-in detection
    //--------------------------------------------------------------------------
    hw_power_Enable5vPlugInDetect(TRUE);

    //--------------------------------------------------------------------------
    // Allow DCDC be to active when 5V is present.
    //--------------------------------------------------------------------------
    hw_power_EnableDcdc(true);


}
Beispiel #3
0
RtStatus_t hw_power_InitPowerSupplies(void)
{
    RtStatus_t Status;

    //----------------------------------------------------------------------
    // Make sure the power supplies are configured for their power sources.
    // This sets the LINREG_OFFSET field correctly for each power supply.
    //---------------------------------------------------------------------

    if(hw_power_Get5vPresentFlag())
    {

        if((Status = hw_power_SetVdddPowerSource(HW_POWER_LINREG_DCDC_READY))
                != SUCCESS)
            return Status;
        if((Status = hw_power_SetVddaPowerSource(HW_POWER_LINREG_DCDC_READY))
                != SUCCESS)
            return Status;
        if((Status = hw_power_SetVddioPowerSource(HW_POWER_LINREG_DCDC_READY))
                != SUCCESS)
            return Status;
    }
    else
    {

        if((Status = hw_power_SetVdddPowerSource(HW_POWER_DCDC_LINREG_READY))
                != SUCCESS)
            return Status;
        if((Status = hw_power_SetVddaPowerSource(HW_POWER_DCDC_LINREG_READY))
                != SUCCESS)
            return Status;
        if((Status = hw_power_SetVddioPowerSource(HW_POWER_DCDC_LINREG_READY))
                != SUCCESS)
            return Status;

        // Need to make sure the DCDC does not run with a bad or broken battery.
        if( hw_power_GetBatteryVoltage() <= 2800 )
        {
            hw_power_PowerDown();
        }
        hw_power_ClearBatteryBrownoutInterrupt();
        hw_power_EnableBatteryBrownoutInterrupt(true);
        hw_power_EnableDcdc(true);
    }

    //--------------------------------------------------------------------------
    // Done.
    //--------------------------------------------------------------------------
    return SUCCESS;
}
////////////////////////////////////////////////////////////////////////////////
//! \brief Transfers the power source from 5V to the battery.
//!
//! \fntype Function
//!
//! This function will handle all the power rail transitions necesarry to power
//! the chip from the battery when it was previously powered from the 5V power
//! source.
//!
////////////////////////////////////////////////////////////////////////////////
void ddi_power_Execute5VoltsToBatteryHandoff(void)
{

    if(ddi_power_Is4p2Enabled())
    {
        //----------------------------------------------------------------------
        // Stop the 4p2 rail from powering the DCDC
        //----------------------------------------------------------------------
        ddi_power_Stop4p2();

        //--------------------------------------------------------------------------
        // Disable hardware power down when 5V is inserted or removed
        //--------------------------------------------------------------------------
        hw_power_Enable5vBrownoutPowerdown( false );

        //--------------------------------------------------------------------------
        // Re-enable the battery brownout interrupt in case it was disabled.
        //--------------------------------------------------------------------------
        hw_power_EnableBatteryBrownoutInterrupt(TRUE);

        return;
    }

    //--------------------------------------------------------------------------
    // We are about to power the chip from battery.  If the battery level is
    // at the hard brownout level, the FIQ handler will shut down the chip.
    // Set the hard level and enable the battery interrupt.
    //--------------------------------------------------------------------------
    hw_power_SetBatteryBrownoutCode( g_ddi_power_BatteryBrownOutVoltageCode );
    hw_power_EnableBatteryBrownoutInterrupt( true );

    // Enforce battery powered operation
    hw_power_EnableDcdc(true);

    //--------------------------------------------------------------------------
    if(hw_power_GetVdddPowerSource() == HW_POWER_EXTERNAL_SOURCE_5V)
	{
		// When powered from external sources, we need to temporarily
		// increase the target to prevent the DCDC from fighting
		// with the external source.  PMI will change the target to
		// the correct voltage after the source transition.
		hw_power_SetVdddBrownoutValue(175);
		hw_power_SetVdddValue(1575);
		ddi_power_WaitForVdddStable();
		hw_power_SetVdddBrownoutValue(125);
	}

	hw_power_SetVdddPowerSource(HW_POWER_DCDC_LINREG_READY);

    //--------------------------------------------------------------------------
    // Power VDDA and VDDIO from the DCDC.
    //--------------------------------------------------------------------------
    hw_power_SetVddaPowerSource(HW_POWER_DCDC_LINREG_READY);
    hw_power_SetVddioPowerSource(HW_POWER_DCDC_LINREG_ON);

    //--------------------------------------------------------------------------
    // Disable hardware power down when 5V is inserted or removed
    //--------------------------------------------------------------------------
    hw_power_Enable5vBrownoutPowerdown( false );

    //--------------------------------------------------------------------------
    // Transition to battery power went smoothly.  Now reset the soft battery
    // level for normal battery operation.
    //--------------------------------------------------------------------------
    hw_power_SetBatteryBrownoutCode( g_ddi_power_SafeBatteryVoltageCode );
    hw_power_EnableBatteryBrownoutInterrupt( true );


}