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[FL-667] Power saving: deep sleep in tickless state (#300)

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* SYSTEM: tickless mode with deep sleep.
* Move FreeRTOS ticks to lptim2.
* API: move all sumbodules init routines to one place.
* Timebase: working lptim2 at tick source.
* API Timebase: lp-timer routines, timer access safe zones prediction and synchronization. 
* FreeRTOS: adjust configuration for tickless mode.
* NFC: support for tickless mode.
* API Timebase: improve tick error handling in IRQ. 
* Apploader: use insomnia mode to run applications.
* BLE: prevent sleep while core2 starting.
* HAL: nap while in insomnia mode.

Co-authored-by: coreglitch <mail@s3f.ru>
This commit is contained in:
あく
2021-01-18 18:08:58 +03:00
committed by GitHub
parent c3a8af8448
commit c8aca9ef48
44 changed files with 395 additions and 200 deletions
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174
firmware/targets/f4/api-hal/api-hal-timebase.c Normal file
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#include <api-hal-timebase.h>
#include <api-hal-timebase-timer.h>
#include <stm32wbxx_hal.h>
#include <stm32wbxx_ll_gpio.h>
#include <FreeRTOS.h>
#include <cmsis_os.h>
#define API_HAL_TIMEBASE_CLK_FREQUENCY 32768
#define API_HAL_TIMEBASE_TICK_PER_SECOND 1024
#define API_HAL_TIMEBASE_CLK_PER_TICK (API_HAL_TIMEBASE_CLK_FREQUENCY / API_HAL_TIMEBASE_TICK_PER_SECOND)
#define API_HAL_TIMEBASE_TICK_PER_EPOCH (API_HAL_TIMEBASE_TIMER_MAX / API_HAL_TIMEBASE_CLK_PER_TICK)
#define API_HAL_TIMEBASE_MAX_SLEEP (API_HAL_TIMEBASE_TICK_PER_EPOCH - 1)
typedef struct {
// Sleep control
volatile uint16_t insomnia;
// Tick counters
volatile uint32_t in_sleep;
volatile uint32_t in_awake;
// Error counters
volatile uint32_t sleep_error;
volatile uint32_t awake_error;
} ApiHalTimbase;
ApiHalTimbase api_hal_timebase = {
.insomnia = 0,
.in_sleep = 0,
.in_awake = 0,
.sleep_error = 0,
.awake_error = 0,
};
void api_hal_timebase_init() {
api_hal_timebase_timer_init();
LL_DBGMCU_APB1_GRP2_FreezePeriph(LL_DBGMCU_APB1_GRP2_LPTIM2_STOP);
LL_LPTIM_EnableIT_CMPM(API_HAL_TIMEBASE_TIMER);
LL_LPTIM_EnableIT_ARRM(API_HAL_TIMEBASE_TIMER);
LL_LPTIM_SetAutoReload(API_HAL_TIMEBASE_TIMER, API_HAL_TIMEBASE_TIMER_MAX);
LL_LPTIM_SetCompare(API_HAL_TIMEBASE_TIMER, API_HAL_TIMEBASE_CLK_PER_TICK);
LL_LPTIM_StartCounter(API_HAL_TIMEBASE_TIMER, LL_LPTIM_OPERATING_MODE_CONTINUOUS);
}
uint16_t api_hal_timebase_insomnia_level() {
return api_hal_timebase.insomnia;
}
void api_hal_timebase_insomnia_enter() {
api_hal_timebase.insomnia++;
}
void api_hal_timebase_insomnia_exit() {
api_hal_timebase.insomnia--;
}
void LPTIM2_IRQHandler(void) {
// Autoreload
const bool arrm_flag = LL_LPTIM_IsActiveFlag_ARRM(API_HAL_TIMEBASE_TIMER);
if(arrm_flag) {
LL_LPTIM_ClearFLAG_ARRM(API_HAL_TIMEBASE_TIMER);
}
if(LL_LPTIM_IsActiveFlag_CMPM(API_HAL_TIMEBASE_TIMER)) {
LL_LPTIM_ClearFLAG_CMPM(API_HAL_TIMEBASE_TIMER);
// Store important value
uint16_t cnt = api_hal_timebase_timer_get_cnt();
uint16_t cmp = api_hal_timebase_timer_get_cmp();
uint16_t current_tick = cnt / API_HAL_TIMEBASE_CLK_PER_TICK;
uint16_t compare_tick = cmp / API_HAL_TIMEBASE_CLK_PER_TICK;
// Calculate error
// happens when HAL or other high priority IRQ takes our time
int32_t error = (int32_t)compare_tick - current_tick;
api_hal_timebase.awake_error += ((error>0) ? error : -error);
// Calculate and set next tick
uint16_t next_tick = current_tick + 1;
api_hal_timebase_timer_set_cmp(next_tick * API_HAL_TIMEBASE_CLK_PER_TICK);
// Notify OS
api_hal_timebase.in_awake ++;
if (xTaskGetSchedulerState() != taskSCHEDULER_NOT_STARTED) {
xPortSysTickHandler();
}
}
}
static inline uint32_t api_hal_timebase_nap(TickType_t expected_idle_ticks) {
__WFI();
return 0;
}
static inline uint32_t api_hal_timebase_sleep(TickType_t expected_idle_ticks) {
// Store important value before going to sleep
const uint16_t before_cnt = api_hal_timebase_timer_get_cnt();
const uint16_t before_tick = before_cnt / API_HAL_TIMEBASE_CLK_PER_TICK;
// Calculate and set next wakeup compare value
const uint16_t expected_cnt = (before_tick + expected_idle_ticks - 2) * API_HAL_TIMEBASE_CLK_PER_TICK;
api_hal_timebase_timer_set_cmp(expected_cnt);
// Go to stop2 mode
HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI);
// Spin till we are in timer safe zone
while(!api_hal_timebase_timer_is_safe()) {}
// Store current counter value, calculate current tick
const uint16_t after_cnt = api_hal_timebase_timer_get_cnt();
const uint16_t after_tick = after_cnt / API_HAL_TIMEBASE_CLK_PER_TICK;
// Store and clear interrupt flags
// we don't want handler to be called after renabling IRQ
bool cmpm_flag = LL_LPTIM_IsActiveFlag_CMPM(API_HAL_TIMEBASE_TIMER);
if (cmpm_flag) LL_LPTIM_ClearFLAG_CMPM(API_HAL_TIMEBASE_TIMER);
bool arrm_flag = LL_LPTIM_IsActiveFlag_ARRM(API_HAL_TIMEBASE_TIMER);
if (arrm_flag) LL_LPTIM_ClearFLAG_ARRM(API_HAL_TIMEBASE_TIMER);
// Calculate and set next wakeup compare value
const uint16_t next_cmp = (after_tick + 1) * API_HAL_TIMEBASE_CLK_PER_TICK;
api_hal_timebase_timer_set_cmp(next_cmp);
// Calculate ticks count spent in sleep and perform sanity checks
int32_t completed_ticks = arrm_flag ? (int32_t)before_tick - after_tick : (int32_t)after_tick - before_tick;
return completed_ticks;
}
void vPortSuppressTicksAndSleep(TickType_t expected_idle_ticks) {
// Limit mount of ticks to maximum that timer can count
if (expected_idle_ticks > API_HAL_TIMEBASE_MAX_SLEEP) {
expected_idle_ticks = API_HAL_TIMEBASE_MAX_SLEEP;
}
// Stop IRQ handling, no one should disturb us till we finish
__disable_irq();
// Confirm OS that sleep is still possible
// And check if timer is in safe zone
// (8 clocks till any IRQ event or ongoing synchronization)
if (eTaskConfirmSleepModeStatus() == eAbortSleep
|| !api_hal_timebase_timer_is_safe()) {
__enable_irq();
return;
}
uint32_t completed_ticks;
if (api_hal_timebase.insomnia) {
completed_ticks = api_hal_timebase_nap(expected_idle_ticks);
} else {
completed_ticks = api_hal_timebase_sleep(expected_idle_ticks);
}
assert(completed_ticks >= 0);
// Reenable IRQ
__enable_irq();
// Notify system about time spent in sleep
if (completed_ticks > 0) {
api_hal_timebase.in_sleep += completed_ticks;
if (completed_ticks > expected_idle_ticks) {
// We are late, count error
api_hal_timebase.sleep_error += (completed_ticks - expected_idle_ticks);
// Freertos is not happy when we overleep
// But we are not going to tell her
vTaskStepTick(expected_idle_ticks);
} else {
vTaskStepTick(completed_ticks);
}
}
}