////////////////////////////////////////////////////////////////////////////////
//! \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);
}
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 );
}