[FL-2399, FL-2261] Tickless sleep shenanigans (#1168)

* Disable USART in sleep
* Restore UART state on suspend/resume
* FuriHal: Enable stop mode and add insomnia to I2C and SPI
* Remove IDLE interrupt
* FuriHal: add FPU isr and disable all FPU interrupt, add core2 stop mode configuration on deep sleep
* FuriHal: tie stop mode debug with debug rtc flag
* FuriHal: adjust flash latency on clock switch, tie mcu debug with RTC debug flag
* FuriHal: move resource init to early stage
* Add EXTI pending check, enable debug traps with compile-time flag
* Wrap sleep debug functions in conditional compilation
* Remove erroneous changed
* Do not use CSS, remove it from everywhere
* Enable/disable USB on VBUS connect (prototype)
* FuriHal: add LPMS and DEEPSLEEP magic, workaround state inconsistency between cores
* FuriHal: honor c1 LMPS
* USB mode switch fix
* Applications: add flags and insomnia bypass system
* Correct spelling
* FuriHal: cleanup insomnia usage, reset sleep flags on wakeup, add shutdown api
* FuriHal: extra check on reinit request
* FuriHal: rename gpio_display_rst pin to gpio_display_rst_n
* FuriHal: add debug HAL
* FuriHal: add some magic to core2 reload procedure, fix issue with crash on ble keyboard exit
* FuriHal: cleanup ble glue, add BLE_GLUE_DEBUG flag
* FuriHal: ble reinit API, move os timer to LPTIM1 for deep sleep capability, shutdown that works
* FuriHal: take insomnia while shutdown
* Remove USB switch on/off on VBUS change
* Better tick skew handling
* Improve tick consistency under load
* Add USB_HP dummy IRQ handler
* Move interrupt check closer to sleep
* Clean up includes
* Re-enable Insomnia globally
* FuriHal: enable CSS
* FuriHal: remove questionable core2 clock shenanigans
* FuriHal: use core1 RCC registers in idle timer config
* FuriHal: return back CSS handlers, add lptim isr dispatching

Co-authored-by: Aleksandr Kutuzov <alleteam@gmail.com>
Co-authored-by: nminaylov <nm29719@gmail.com>

firmware/targets/furi_hal_include/furi_hal.h

@@ -12,6 +12,7 @@ template <unsigned int N> struct STOP_EXTERNING_ME {};
 #include "furi_hal_clock.h"
 #include "furi_hal_crypto.h"
 #include "furi_hal_console.h"
+#include "furi_hal_debug.h"
 #include "furi_hal_os.h"
 #include "furi_hal_sd.h"
 #include "furi_hal_i2c.h"

firmware/targets/furi_hal_include/furi_hal_bt.h

@@ -68,6 +68,12 @@ FuriHalBtStack furi_hal_bt_get_radio_stack();
 */
 bool furi_hal_bt_start_app(FuriHalBtProfile profile, GapEventCallback event_cb, void* context);
 
+/** Reinitialize core2
+ * 
+ * Also can be used to prepare core2 for stop modes
+ */
+void furi_hal_bt_reinit();
+
 /** Change BLE app
  * Restarts 2nd core
  *

firmware/targets/furi_hal_include/furi_hal_debug.h

@@ -0,0 +1,23 @@
+/**
+ * @file furi_hal_debug.h
+ * Debug HAL API
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** Enable MCU debug */
+void furi_hal_debug_enable();
+
+/** Disable MCU debug */
+void furi_hal_debug_disable();
+
+#ifdef __cplusplus
+}
+#endif

firmware/targets/furi_hal_include/furi_hal_power.h

@@ -85,6 +85,9 @@ uint8_t furi_hal_power_get_bat_health_pct();
  */
 bool furi_hal_power_is_charging();
 
+/** Switch MCU to SHUTDOWN */
+void furi_hal_power_shutdown();
+
 /** Poweroff device
  */
 void furi_hal_power_off();