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contiki/cpu/stm32w108/hal/micro/cortexm3/sleep.c
Adam Dunkels a5046e83c7 Cleanup and refactoring of the STM32w port 
This is a general cleanup of things like code style issues and code structure of the STM32w port to make it more like the rest of Contiki is structured.
2013-03-18 13:31:26 +01:00

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/** @file hal/micro/cortexm3/sleep.c
*
* @brief STM32W108 micro specific sleep functions.
*
* <!--(C) COPYRIGHT 2010 STMicroelectronics. All rights reserved. -->
*/
#include PLATFORM_HEADER
#include "hal/micro/micro-common.h"
#include "hal/micro/cortexm3/micro-common.h"
//We don't have a real register to hold this composite information.
//Pretend we do so halGetWakeInfo can operate like halGetResetInfo.
//This "register" is only ever set by halInternalSleep.
// [31] = WakeInfoValid
// [30] = SleepSkipped
// [29] = CSYSPWRUPREQ
// [28] = CDBGPWRUPREQ
// [27] = WAKE_CORE
// [26] = TIMER_WAKE_WRAP
// [25] = TIMER_WAKE_COMPB
// [24] = TIMER_WAKE_COMPA
// [23:0] = corresponding GPIO activity
#define WAKEINFOVALID_INTERNAL_WAKE_EVENT_BIT 31
#define SLEEPSKIPPED_INTERNAL_WAKE_EVENT_BIT 30
#define CSYSPWRUPREQ_INTERNAL_WAKE_EVENT_BIT 29
#define CDBGPWRUPREQ_INTERNAL_WAKE_EVENT_BIT 28
#define WAKE_CORE_INTERNAL_WAKE_EVENT_BIT 27
#define WRAP_INTERNAL_WAKE_EVENT_BIT 26
#define CMPB_INTERNAL_WAKE_EVENT_BIT 25
#define CMPA_INTERNAL_WAKE_EVENT_BIT 24
//This define shifts events from the PWRUP_EVENT register into the proper
//place in the halInternalWakeEvent variable
#define INTERNAL_WAKE_EVENT_BIT_SHIFT 20
static uint32_t halInternalWakeEvent=0;
uint32_t halGetWakeInfo(void)
{
return halInternalWakeEvent;
}
void halInternalSleep(SleepModes sleepMode)
{
//Timer restoring always takes place during the wakeup sequence. We save
//the state here in case SLEEPMODE_NOTIMER is invoked, which would disable
//the clocks.
uint32_t SLEEPTMR_CLKEN_SAVED = SLEEPTMR_CLKEN;
//This code assumes all wake source registers are properly configured.
//As such, it should be called from halSleepWithOptions() or from
// halSleepForQsWithOptions() which configues the wake sources.
//The parameter gpioWakeSel is a bitfield composite of the GPIO wake
//sources derived from the 3 ports, indicating which of the 24 GPIO
//are configured as a wake source.
uint32_t gpioWakeSel = (GPIO_PAWAKE<<0);
gpioWakeSel |= (GPIO_PBWAKE<<8);
gpioWakeSel |= (GPIO_PCWAKE<<16);
//PB2 is also WAKE_SC1. Set this wake source if PB2's GPIO wake is set.
if(GPIO_PBWAKE & PB2) {
WAKE_SEL |= WAKE_SC1;
}
//PA2 is also WAKE_SC2. Set this wake source if PA2's GPIO wake is set.
if(GPIO_PAWAKE & PA2) {
WAKE_SEL |= WAKE_SC2;
}
//The WAKE_IRQD source can come from any pin based on IRQD's sel register.
if(gpioWakeSel & BIT(GPIO_IRQDSEL)) {
WAKE_SEL |= WAKE_IRQD;
}
halInternalWakeEvent = 0; //clear old wake events
switch(sleepMode)
{
case SLEEPMODE_NOTIMER:
//The sleep timer clock sources (both RC and XTAL) are turned off.
//Wakeup is possible from only GPIO. System time is lost.
//NOTE: Timer restoring always takes place during the wakeup sequence.
SLEEPTMR_CLKEN = 0;
goto deepSleepCore;
case SLEEPMODE_WAKETIMER:
//The sleep timer clock sources remain running. The RC is always
//running and the 32kHz XTAL depends on the board header. Wakeup
//is possible from both GPIO and the sleep timer. System time
//is maintained. The sleep timer is assumed to be configured
//properly for wake events.
//NOTE: This mode assumes the caller has configured the *entire*
// sleep timer properly.
if(INT_SLEEPTMRCFG&INT_SLEEPTMRWRAP) {
WAKE_SEL |= WAKE_SLEEPTMRWRAP;
}
if(INT_SLEEPTMRCFG&INT_SLEEPTMRCMPB) {
WAKE_SEL |= WAKE_SLEEPTMRCMPB;
}
if(INT_SLEEPTMRCFG&INT_SLEEPTMRCMPA) {
WAKE_SEL |= WAKE_SLEEPTMRCMPA;
}
//fall into SLEEPMODE_MAINTAINTIMER's sleep code:
case SLEEPMODE_MAINTAINTIMER:
//The sleep timer clock sources remain running. The RC is always
//running and the 32kHz XTAL depends on the board header. Wakeup
//is possible from only GPIO. System time is maintained.
//NOTE: System time is maintained without any sleep timer interrupts
// because the hardware sleep timer counter is large enough
// to hold the entire count value and not need a RAM counter.
////////////////////////////////////////////////////////////////////////////
// Core deep sleep code
////////////////////////////////////////////////////////////////////////////
deepSleepCore:
// Interrupts *must* be/stay disabled for DEEP SLEEP operation
// INTERRUPTS_OFF will use BASEPRI to disable all interrupts except
// fault handlers and PendSV.
INTERRUPTS_OFF();
// This is the point of no return. From here on out, only the interrupt
// sources available in WAKE_SEL will be captured and propagated across
// deep sleep.
//stick all our saved info onto stack since it's only temporary
{
boolean restoreWatchdog = halInternalWatchDogEnabled();
boolean skipSleep = FALSE;
// Only three register blocks keep power across deep sleep:
// CM_HV, GPIO, SLOW_TIMERS
//
// All other register blocks lose their state across deep sleep:
// BASEBAND, MAC, SECURITY, SERIAL, TMR1, TMR2, EVENT, CM_LV, RAM_CTRL,
// AUX_ADC, CAL_ADC, FLASH_CONTROL, ITM, DWT, FPB, NVIC, TPIU
//
// The sleep code will only save and restore registers where it is
// meaningful and necessary to do so. In most cases, there must still
// be a powerup function to restore proper state.
//
// NOTE: halPowerUp() and halPowerDown() will always be called before
// and after this function. halPowerDown and halPowerUp should leave
// the modules in a safe state and then restart the modules.
// (For example, shutting down and restarting Timer1)
//
//----BASEBAND
// reinitialized by stStackPowerUp()
//----MAC
// reinitialized by stStackPowerUp()
//----SECURITY
// reinitialized by stStackPowerUp()
//----SERIAL
// reinitialized by halPowerUp() or similar
//----TMR1
// reinitialized by halPowerUp() or similar
//----TMR2
// reinitialized by halPowerUp() or similar
//----EVENT
//SRC or FLAG interrupts are not saved or restored
//MISS interrupts are not saved or restored
//MAC_RX_INT_MASK - reinitialized by stStackPowerUp()
//MAC_TX_INT_MASK - reinitialized by stStackPowerUp()
//MAC_TIMER_INT_MASK - reinitialized by stStackPowerUp()
//BB_INT_MASK - reinitialized by stStackPowerUp()
//SEC_INT_MASK - reinitialized by stStackPowerUp()
uint32_t INT_SLEEPTMRCFG_SAVED = INT_SLEEPTMRCFG_REG;
uint32_t INT_MGMTCFG_SAVED = INT_MGMTCFG_REG;
//INT_TIM1CFG - reinitialized by halPowerUp() or similar
//INT_TIM2CFG - reinitialized by halPowerUp() or similar
//INT_SC1CFG - reinitialized by halPowerUp() or similar
//INT_SC2CFG - reinitialized by halPowerUp() or similar
//INT_ADCCFG - reinitialized by halPowerUp() or similar
uint32_t GPIO_INTCFGA_SAVED = GPIO_INTCFGA_REG;
uint32_t GPIO_INTCFGB_SAVED = GPIO_INTCFGB_REG;
uint32_t GPIO_INTCFGC_SAVED = GPIO_INTCFGC_REG;
uint32_t GPIO_INTCFGD_SAVED = GPIO_INTCFGD_REG;
//SC1_INTMODE - reinitialized by halPowerUp() or similar
//SC2_INTMODE - reinitialized by halPowerUp() or similar
//----CM_LV
uint32_t OSC24M_BIASTRIM_SAVED = OSC24M_BIASTRIM_REG;
uint32_t OSCHF_TUNE_SAVED = OSCHF_TUNE_REG;
uint32_t DITHER_DIS_SAVED = DITHER_DIS_REG;
//OSC24M_CTRL - reinitialized by halPowerUp() or similar
//CPU_CLKSEL - reinitialized by halPowerUp() or similar
//TMR1_CLK_SEL - reinitialized by halPowerUp() or similar
//TMR2_CLK_SEL - reinitialized by halPowerUp() or similar
uint32_t PCTRACE_SEL_SAVED = PCTRACE_SEL_REG;
//----RAM_CTRL
uint32_t MEM_PROT_0_SAVED = MEM_PROT_0_REG;
uint32_t MEM_PROT_1_SAVED = MEM_PROT_1_REG;
uint32_t MEM_PROT_2_SAVED = MEM_PROT_2_REG;
uint32_t MEM_PROT_3_SAVED = MEM_PROT_3_REG;
uint32_t MEM_PROT_4_SAVED = MEM_PROT_4_REG;
uint32_t MEM_PROT_5_SAVED = MEM_PROT_5_REG;
uint32_t MEM_PROT_6_SAVED = MEM_PROT_6_REG;
uint32_t MEM_PROT_7_SAVED = MEM_PROT_7_REG;
uint32_t MEM_PROT_EN_SAVED = MEM_PROT_EN_REG;
//----AUX_ADC
// reinitialized by halPowerUp() or similar
//----CAL_ADC
// reinitialized by stStackPowerUp()
//----FLASH_CONTROL
// configured on the fly by the flash library
//----ITM
// reinitialized by halPowerUp() or similar
//----DWT
// not used by software on chip
//----FPB
// not used by software on chip
//----NVIC
//ST_CSR - fixed, restored by cstartup when exiting deep sleep
//ST_RVR - fixed, restored by cstartup when exiting deep sleep
uint32_t INT_CFGSET_SAVED = INT_CFGSET_REG; //mask against wake sources
//INT_PENDSET - used below when overlapping interrupts and wake sources
//NVIC_IPR_3to0 - fixed, restored by cstartup when exiting deep sleep
//NVIC_IPR_7to4 - fixed, restored by cstartup when exiting deep sleep
//NVIC_IPR_11to8 - fixed, restored by cstartup when exiting deep sleep
//NVIC_IPR_15to12 - fixed, restored by cstartup when exiting deep sleep
//NVIC_IPR_19to16 - fixed, restored by cstartup when exiting deep sleep
uint32_t SCS_VTOR_SAVED = SCS_VTOR_REG;
//SCS_CCR - fixed, restored by cstartup when exiting deep sleep
//SCS_SHPR_7to4 - fixed, restored by cstartup when exiting deep sleep
//SCS_SHPR_11to8 - fixed, restored by cstartup when exiting deep sleep
//SCS_SHPR_15to12 - fixed, restored by cstartup when exiting deep sleep
//SCS_SHCSR - fixed, restored by cstartup when exiting deep sleep
//----TPIU
// reinitialized by halPowerUp() or similar
//stmDebugPowerDown() should have shutdown the DWT/ITM/TPIU already.
//freeze input to the GPIO from LV (alternate output functions freeze)
EVENT_CTRL = LV_FREEZE;
//record GPIO state for wake monitoring purposes
//By having a snapshot of GPIO state, we can figure out after waking
//up exactly which GPIO could have woken us up.
//Reading the three IN registers is done separately to avoid warnings
//about undefined order of volatile access.
uint32_t GPIO_IN_SAVED = GPIO_PAIN;
GPIO_IN_SAVED |= (GPIO_PBIN<<8);
GPIO_IN_SAVED |= (GPIO_PCIN<<16);
//reset the power up events by writing 1 to all bits.
PWRUP_EVENT = 0xFFFFFFFF;
//By clearing the events, the wake up event capturing is activated.
//At this point we can safely check our interrupt flags since event
//capturing is now overlapped. Up to now, interrupts indicate
//activity, after this point, powerup events indicate activity.
//If any of the interrupt flags are set, that means we saw a wake event
//sometime while entering sleep, so we need to skip over sleeping
//
//--possible interrupt sources for waking:
// IRQA, IRQB, IRQC, IRQD
// SleepTMR CMPA, CMPB, Wrap
// WAKE_CORE (DebugIsr)
//
//check for IRQA interrupt and if IRQA (PB0) is wake source
if((INT_PENDSET&INT_IRQA) &&
(GPIO_PBWAKE&PB0) &&
(WAKE_SEL&GPIO_WAKE)) {
skipSleep = TRUE;
//log IRQA as a wake event
halInternalWakeEvent |= BIT(PORTB_PIN(0));
}
//check for IRQB interrupt and if IRQB (PB6) is wake source
if((INT_PENDSET&INT_IRQB) &&
(GPIO_PBWAKE&PB6) &&
(WAKE_SEL&GPIO_WAKE)) {
skipSleep = TRUE;
//log IRQB as a wake event
halInternalWakeEvent |= BIT(PORTB_PIN(6));
}
//check for IRQC interrupt and if IRQC (GPIO_IRQCSEL) is wake source
if((INT_PENDSET&INT_IRQC) &&
(gpioWakeSel&BIT(GPIO_IRQCSEL)) &&
(WAKE_SEL&GPIO_WAKE)) {
skipSleep = TRUE;
//log IRQC as a wake event
halInternalWakeEvent |= BIT(GPIO_IRQCSEL);
}
//check for IRQD interrupt and if IRQD (GPIO_IRQDSEL) is wake source
if((INT_PENDSET&INT_IRQD) &&
(gpioWakeSel&BIT(GPIO_IRQDSEL)) &&
((WAKE_SEL&GPIO_WAKE) ||
(WAKE_SEL&WAKE_IRQD))) {
skipSleep = TRUE;
//log IRQD as a wake event
halInternalWakeEvent |= BIT(GPIO_IRQDSEL);
}
//check for SleepTMR CMPA interrupt and if SleepTMR CMPA is wake source
if((INT_SLEEPTMR&INT_SLEEPTMRCMPA) && (WAKE_SEL&WAKE_SLEEPTMRCMPA)) {
skipSleep = TRUE;
//log SleepTMR CMPA as a wake event
halInternalWakeEvent |= BIT32(CMPA_INTERNAL_WAKE_EVENT_BIT);
}
//check for SleepTMR CMPB interrupt and if SleepTMR CMPB is wake source
if((INT_SLEEPTMR&INT_SLEEPTMRCMPB) && (WAKE_SEL&WAKE_SLEEPTMRCMPB)) {
skipSleep = TRUE;
//log SleepTMR CMPB as a wake event
halInternalWakeEvent |= BIT32(CMPB_INTERNAL_WAKE_EVENT_BIT);
}
//check for SleepTMR WRAP interrupt and if SleepTMR WRAP is wake source
if((INT_SLEEPTMR&INT_SLEEPTMRWRAP) && (WAKE_SEL&WAKE_SLEEPTMRWRAP)) {
skipSleep = TRUE;
//log SleepTMR WRAP as a wake event
halInternalWakeEvent |= BIT32(WRAP_INTERNAL_WAKE_EVENT_BIT);
}
//check for Debug interrupt and if WAKE_CORE is wake source
if((INT_PENDSET&INT_DEBUG) && (WAKE_SEL&WAKE_WAKE_CORE)) {
skipSleep = TRUE;
//log WAKE_CORE as a wake event
halInternalWakeEvent |= BIT32(WAKE_CORE_INTERNAL_WAKE_EVENT_BIT);
}
//only propagate across deep sleep the interrupts that are both
//enabled and possible wake sources
{
uint32_t wakeSourceInterruptMask = 0;
if(GPIO_PBWAKE&PB0) {
wakeSourceInterruptMask |= INT_IRQA;
}
if(GPIO_PBWAKE&PB6) {
wakeSourceInterruptMask |= INT_IRQB;
}
if(gpioWakeSel&BIT(GPIO_IRQCSEL)) {
wakeSourceInterruptMask |= INT_IRQC;
}
if(gpioWakeSel&BIT(GPIO_IRQDSEL)) {
wakeSourceInterruptMask |= INT_IRQD;
}
if( (WAKE_SEL&WAKE_SLEEPTMRCMPA) ||
(WAKE_SEL&WAKE_SLEEPTMRCMPB) ||
(WAKE_SEL&WAKE_SLEEPTMRWRAP) ) {
wakeSourceInterruptMask |= INT_SLEEPTMR;
}
if(WAKE_SEL&WAKE_WAKE_CORE) {
wakeSourceInterruptMask |= INT_DEBUG;
}
INT_CFGSET_SAVED &= wakeSourceInterruptMask;
}
//disable watchdog while sleeping (since we can't reset it asleep)
halInternalDisableWatchDog(MICRO_DISABLE_WATCH_DOG_KEY);
//The chip is not allowed to enter a deep sleep mode (which could
//cause a core reset cycle) while CSYSPWRUPREQ is set. CSYSPWRUPREQ
//indicates that the debugger is trying to access sections of the
//chip that would get reset during deep sleep. Therefore, a reset
//cycle could very easily cause the debugger to error and we don't
//want that. While the power management state machine will stall
//if CSYSPWRUPREQ is set (to avoid the situation just described),
//in this stalled state the chip will not be responsive to wake
//events. To be sensitive to wake events, we must handle them in
//software instead. To accomplish this, we request that the
//CSYSPWRUPACK be inhibited (which will indicate the debugger is not
//connected). But, we cannot induce deep sleep until CSYSPWRUPREQ/ACK
//go low and these are under the debuggers control, so we must stall
//and wait here. If there is a wake event during this time, break
//out and wake like normal. If the ACK eventually clears,
//we can proceed into deep sleep. The CSYSPWRUPACK_INHIBIT
//functionality will hold off the debugger (by holding off the ACK)
//until we are safely past and out of deep sleep. The power management
//state machine then becomes responsible for clearing
//CSYSPWRUPACK_INHIBIT and responding to a CSYSPWRUPREQ with a
//CSYSPWRUPACK at the right/safe time.
CSYSPWRUPACK_INHIBIT = CSYSPWRUPACK_INHIBIT_CSYSPWRUPACK_INHIBIT;
{
//Use a local copy of WAKE_SEL to avoid warnings from the compiler
//about order of volatile accesses
uint32_t wakeSel = WAKE_SEL;
//stall until a wake event or CSYSPWRUPREQ/ACK clears
while( (CSYSPWRUPACK_STATUS) && (!(PWRUP_EVENT&wakeSel)) ) {}
//if there was a wake event, allow CSYSPWRUPACK and skip sleep
if(PWRUP_EVENT&wakeSel) {
CSYSPWRUPACK_INHIBIT = CSYSPWRUPACK_INHIBIT_RESET;
skipSleep = TRUE;
}
}
if(!skipSleep) {
//FogBugz 7283 states that we must switch to the OSCHF when entering
//deep sleep since using the 24MHz XTAL could result in RAM
//corruption. This switch must occur at least 2*24MHz cycles before
//sleeping.
//FogBugz 8858 states that we cannot go into deep-sleep when the
//chip is clocked with the 24MHz XTAL with a duty cycle as low as
//70/30 since this causes power_down generation timing to fail.
OSC24M_CTRL &= ~OSC24M_CTRL_OSC24M_SEL;
//If DS12 needs to be forced regardless of state, clear
//REGEN_DSLEEP here. This is hugely dangerous and
//should only be done in very controlled chip tests.
SCS_SCR |= SCS_SCR_SLEEPDEEP; //enable deep sleep
extern volatile boolean halPendSvSaveContext;
halPendSvSaveContext = 1; //1 means save context
//The INTERRUPTS_OFF used at the beginning of this function set
//BASEPRI such that the only interrupts that will fire are faults
//and PendSV. Trigger PendSV now to induce a context save.
SCS_ICSR |= SCS_ICSR_PENDSVSET; //pend the context save and Dsleep
//Since the interrupt will not fire immediately it is possible to
//execute a few lines of code. To stay halted in this spot until the
//WFI instruction, spin on the context flag (which will get cleared
//during the startup sequence when restoring context).
while(halPendSvSaveContext) {}
//I AM ASLEEP. WHEN EXECUTION RESUMES, CSTARTUP WILL RESTORE TO HERE
} else {
//Record the fact that we skipped sleep
halInternalWakeEvent |= BIT32(SLEEPSKIPPED_INTERNAL_WAKE_EVENT_BIT);
//If this was a true deep sleep, we would have executed cstartup and
//PRIMASK would be set right now. If we skipped sleep, PRIMASK is not
//set so we explicitely set it to guarantee the powerup sequence
//works cleanly and consistently with respect to interrupt
//dispatching and enabling.
_setPriMask();
}
//Clear the interrupt flags for all wake sources. This
//is necessary because if we don't execute an actual deep sleep cycle
//the interrupt flags will never be cleared. By clearing the flags,
//we always mimick a real deep sleep as closely as possible and
//guard against any accidental interrupt triggering coming out
//of deep sleep. (The interrupt dispatch code coming out of sleep
//is responsible for translating wake events into interrupt events,
//and if we don't clear interrupt flags here it's possible for an
//interrupt to trigger even if it wasn't the true wake event.)
INT_SLEEPTMRFLAG = (INT_SLEEPTMRCMPA |
INT_SLEEPTMRCMPB |
INT_SLEEPTMRWRAP);
INT_GPIOFLAG = (INT_IRQAFLAG |
INT_IRQBFLAG |
INT_IRQCFLAG |
INT_IRQDFLAG);
//immediately restore the registers we saved before sleeping
//so IRQ and SleepTMR capture can be reenabled as quickly as possible
//this is safe because our global interrupts are still disabled
//other registers will be restored later
SLEEPTMR_CLKEN_REG = SLEEPTMR_CLKEN_SAVED;
INT_SLEEPTMRCFG_REG = INT_SLEEPTMRCFG_SAVED;
INT_MGMTCFG_REG = INT_MGMTCFG_SAVED;
GPIO_INTCFGA_REG = GPIO_INTCFGA_SAVED;
GPIO_INTCFGB_REG = GPIO_INTCFGB_SAVED;
GPIO_INTCFGC_REG = GPIO_INTCFGC_SAVED;
GPIO_INTCFGD_REG = GPIO_INTCFGD_SAVED;
OSC24M_BIASTRIM_REG = OSC24M_BIASTRIM_SAVED;
OSCHF_TUNE_REG = OSCHF_TUNE_SAVED;
DITHER_DIS_REG = DITHER_DIS_SAVED;
PCTRACE_SEL_REG = PCTRACE_SEL_SAVED;
MEM_PROT_0_REG = MEM_PROT_0_SAVED;
MEM_PROT_1_REG = MEM_PROT_1_SAVED;
MEM_PROT_2_REG = MEM_PROT_2_SAVED;
MEM_PROT_3_REG = MEM_PROT_3_SAVED;
MEM_PROT_4_REG = MEM_PROT_4_SAVED;
MEM_PROT_5_REG = MEM_PROT_5_SAVED;
MEM_PROT_6_REG = MEM_PROT_6_SAVED;
MEM_PROT_7_REG = MEM_PROT_7_SAVED;
MEM_PROT_EN_REG = MEM_PROT_EN_SAVED;
INT_CFGSET_REG = INT_CFGSET_SAVED;
SCS_VTOR_REG = SCS_VTOR_SAVED;
//WAKE_CORE/INT_DEBUG and INT_IRQx is cleared by INT_PENDCLR below
INT_PENDCLR = 0xFFFFFFFF;
//Now that we're awake, normal interrupts are operational again
//Take a snapshot of the new GPIO state and the EVENT register to
//record our wake event
uint32_t GPIO_IN_NEW = GPIO_PAIN;
GPIO_IN_NEW |= (GPIO_PBIN<<8);
GPIO_IN_NEW |= (GPIO_PCIN<<16);
//Only operate on power up events that are also wake events. Power
//up events will always trigger like an interrupt flag, so we have
//to check them against events that are enabled for waking. (This is
//a two step process because we're accessing two volatile values.)
uint32_t powerUpEvents = PWRUP_EVENT;
powerUpEvents &= WAKE_SEL;
halInternalWakeEvent |= ((GPIO_IN_SAVED^GPIO_IN_NEW)&gpioWakeSel);
//PWRUP_SC1 is PB2 which is bit 10
halInternalWakeEvent |= (!!(powerUpEvents&PWRUP_SC1))<<((1*8)+2);
//PWRUP_SC2 is PA2 which is bit 2
halInternalWakeEvent |= (!!(powerUpEvents&PWRUP_SC2))<<((0*8)+2);
//PWRUP_IRQD is chosen by GPIO_IRQDSEL
halInternalWakeEvent |= (!!(powerUpEvents&PWRUP_IRQD))<<(GPIO_IRQDSEL);
halInternalWakeEvent |= ((powerUpEvents &
(PWRUP_CSYSPWRUPREQ_MASK |
PWRUP_CDBGPWRUPREQ_MASK |
PWRUP_WAKECORE_MASK |
PWRUP_SLEEPTMRWRAP_MASK |
PWRUP_SLEEPTMRCOMPB_MASK |
PWRUP_SLEEPTMRCOMPA_MASK ))
<<INTERNAL_WAKE_EVENT_BIT_SHIFT);
//at this point wake events are fully captured and interrupts have
//taken over handling all new events
//Bring limited interrupts back online. INTERRUPTS_OFF will use
//BASEPRI to disable all interrupts except fault handlers and PendSV.
//PRIMASK is still set though (global interrupt disable) so we need
//to clear that next.
INTERRUPTS_OFF();
//Now that BASEPRI has taken control of interrupt enable/disable,
//we can clear PRIMASK to reenable global interrupt operation.
_clearPriMask();
//wake events are saved and interrupts are back on track,
//disable gpio freeze
EVENT_CTRL = EVENT_CTRL_RESET;
//restart watchdog if it was running when we entered sleep
//do this before dispatching interrupts while we still have tight
//control of code execution
if(restoreWatchdog) {
halInternalEnableWatchDog();
}
//Pend any interrupts associated with deep sleep wake sources. The
//restoration of INT_CFGSET above and the changing of BASEPRI below
//is responsible for proper dispatching of interrupts at the end of
//halSleepWithOptions.
//
//
//The WAKE_CORE wake source triggers a Debug Interrupt. If INT_DEBUG
//interrupt is enabled and WAKE_CORE is a wake event, then pend the
//Debug interrupt (using the wake_core bit).
if( (INT_CFGSET&INT_DEBUG) &&
(halInternalWakeEvent&BIT(WAKE_CORE_INTERNAL_WAKE_EVENT_BIT)) ) {
WAKE_CORE = WAKE_CORE_FIELD;
}
//
//
//The SleepTMR CMPA is linked to a real ISR. If the SleepTMR CMPA
//interrupt is enabled and CMPA is a wake event, then pend the CMPA
//interrupt (force the second level interrupt).
if( (INT_SLEEPTMRCFG&INT_SLEEPTMRCMPA) &&
(halInternalWakeEvent&BIT(CMPA_INTERNAL_WAKE_EVENT_BIT)) ) {
INT_SLEEPTMRFORCE = INT_SLEEPTMRCMPA;
}
//
//The SleepTMR CMPB is linked to a real ISR. If the SleepTMR CMPB
//interrupt is enabled and CMPB is a wake event, then pend the CMPB
//interrupt (force the second level interrupt).
if( (INT_SLEEPTMRCFG&INT_SLEEPTMRCMPB) &&
(halInternalWakeEvent&BIT(CMPB_INTERNAL_WAKE_EVENT_BIT)) ) {
INT_SLEEPTMRFORCE = INT_SLEEPTMRCMPB;
}
//
//The SleepTMR WRAP is linked to a real ISR. If the SleepTMR WRAP
//interrupt is enabled and WRAP is a wake event, then pend the WRAP
//interrupt (force the second level interrupt).
if( (INT_SLEEPTMRCFG&INT_SLEEPTMRWRAP) &&
(halInternalWakeEvent&BIT(WRAP_INTERNAL_WAKE_EVENT_BIT)) ) {
INT_SLEEPTMRFORCE = INT_SLEEPTMRWRAP;
}
//
//
//The four IRQs are linked to a real ISR. If any of the four IRQs
//triggered, then pend their ISR
//
//If the IRQA interrupt mode is enabled and IRQA (PB0) is wake
//event, then pend the interrupt.
if( ((GPIO_INTCFGA&GPIO_INTMOD)!=0) &&
(halInternalWakeEvent&BIT(PORTB_PIN(0))) ) {
INT_PENDSET = INT_IRQA;
}
//If the IRQB interrupt mode is enabled and IRQB (PB6) is wake
//event, then pend the interrupt.
if( ((GPIO_INTCFGB&GPIO_INTMOD)!=0) &&
(halInternalWakeEvent&BIT(PORTB_PIN(6))) ) {
INT_PENDSET = INT_IRQB;
}
//If the IRQC interrupt mode is enabled and IRQC (GPIO_IRQCSEL) is wake
//event, then pend the interrupt.
if( ((GPIO_INTCFGC&GPIO_INTMOD)!=0) &&
(halInternalWakeEvent&BIT(GPIO_IRQCSEL)) ) {
INT_PENDSET = INT_IRQC;
}
//If the IRQD interrupt mode is enabled and IRQD (GPIO_IRQDSEL) is wake
//event, then pend the interrupt.
if( ((GPIO_INTCFGD&GPIO_INTMOD)!=0) &&
(halInternalWakeEvent&BIT(GPIO_IRQDSEL)) ) {
INT_PENDSET = INT_IRQD;
}
}
//Mark the wake events valid just before exiting
halInternalWakeEvent |= BIT32(WAKEINFOVALID_INTERNAL_WAKE_EVENT_BIT);
//We are now reconfigured, appropriate ISRs are pended, and ready to go,
//so enable interrupts!
INTERRUPTS_ON();
break; //and deep sleeping is done!
case SLEEPMODE_IDLE:
//Only the CPU is idled. The rest of the chip continues runing
//normally. The chip will wake from any interrupt.
{
boolean restoreWatchdog = halInternalWatchDogEnabled();
//disable watchdog while sleeping (since we can't reset it asleep)
halInternalDisableWatchDog(MICRO_DISABLE_WATCH_DOG_KEY);
//Normal ATOMIC/INTERRUPTS_OFF/INTERRUPTS_ON uses the BASEPRI mask
//to juggle priority levels so that the fault handlers can always
//be serviced. But, the WFI instruction is only capable of
//working with the PRIMASK bit. Therefore, we have to switch from
//using BASEPRI to PRIMASK to keep interrupts disabled so that the
//WFI can return on an interrupt
//Globally disable interrupts with PRIMASK
_setPriMask();
//Bring the BASEPRI up to 0 to allow interrupts (but still disabled
//with PRIMASK)
INTERRUPTS_ON();
//an internal function call is made here instead of injecting the
//"WFI" assembly instruction because injecting assembly code will
//cause the compiler's optimizer to reduce efficiency.
halInternalIdleSleep();
//The WFI instruction does not actually clear the PRIMASK bit, it
//only allows the PRIMASK bit to be bypassed. Therefore, we must
//manually clear PRIMASK to reenable all interrupts.
_clearPriMask();
//restart watchdog if it was running when we entered sleep
if(restoreWatchdog)
halInternalEnableWatchDog();
}
break;
default:
//Oops! Invalid sleepMode parameter.
assert(0);
}
}
void halSleepWithOptions(SleepModes sleepMode, uint32_t gpioWakeBitMask)
{
//configure all GPIO wake sources
GPIO_PAWAKE = (gpioWakeBitMask>>0)&0xFF;
GPIO_PBWAKE = (gpioWakeBitMask>>8)&0xFF;
GPIO_PCWAKE = (gpioWakeBitMask>>16)&0xFF;
//use the defines found in the board file to choose our wakeup source(s)
WAKE_SEL = 0; //start with no wake sources
//if any of the GPIO wakeup monitor bits are set, enable the top level
//GPIO wakeup monitor
if((GPIO_PAWAKE)||(GPIO_PBWAKE)||(GPIO_PCWAKE)) {
WAKE_SEL |= GPIO_WAKE;
}
//always wakeup when the debugger is connected
WAKE_SEL |= WAKE_CDBGPWRUPREQ;
//always wakeup when the debugger attempts to access the chip
WAKE_SEL |= WAKE_CSYSPWRUPREQ;
//always wakeup when the debug channel attempts to access the chip
WAKE_SEL |= WAKE_WAKE_CORE;
//the timer wakeup sources are enabled below in POWERSAVE, if needed
//wake sources are configured so do the actual sleeping
halInternalSleep(sleepMode);
}
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