332 lines
9.4 KiB
C
332 lines
9.4 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdint.h>
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#include "supervisor/port.h"
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#include "boards/board.h"
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#include "nrfx/hal/nrf_clock.h"
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#include "nrfx/hal/nrf_power.h"
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#include "nrfx/drivers/include/nrfx_power.h"
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#include "nrfx/drivers/include/nrfx_rtc.h"
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#include "nrf/cache.h"
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#include "nrf/clocks.h"
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#include "nrf/power.h"
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#include "nrf/timers.h"
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#include "shared-module/gamepad/__init__.h"
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#include "common-hal/microcontroller/Pin.h"
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#include "common-hal/_bleio/__init__.h"
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#include "common-hal/analogio/AnalogIn.h"
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#include "common-hal/busio/I2C.h"
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#include "common-hal/busio/SPI.h"
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#include "common-hal/busio/UART.h"
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#include "common-hal/pulseio/PWMOut.h"
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#include "common-hal/pulseio/PulseOut.h"
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#include "common-hal/pulseio/PulseIn.h"
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#include "common-hal/rtc/RTC.h"
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#include "common-hal/neopixel_write/__init__.h"
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#include "common-hal/watchdog/WatchDogTimer.h"
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#include "shared-bindings/microcontroller/__init__.h"
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#include "shared-bindings/rtc/__init__.h"
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#include "lib/tinyusb/src/device/usbd.h"
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#ifdef CIRCUITPY_AUDIOBUSIO
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#include "common-hal/audiobusio/I2SOut.h"
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#endif
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#ifdef CIRCUITPY_AUDIOPWMIO
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#include "common-hal/audiopwmio/PWMAudioOut.h"
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#endif
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static void power_warning_handler(void) {
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reset_into_safe_mode(BROWNOUT);
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}
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const nrfx_rtc_t rtc_instance = NRFX_RTC_INSTANCE(2);
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const nrfx_rtc_config_t rtc_config = {
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.prescaler = RTC_FREQ_TO_PRESCALER(0x8000),
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.reliable = 0,
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.tick_latency = 0,
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.interrupt_priority = 6
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};
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#define OVERFLOW_CHECK_PREFIX 0x2cad564f
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#define OVERFLOW_CHECK_SUFFIX 0x11343ef7
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static volatile struct {
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uint32_t prefix;
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uint64_t overflowed_ticks;
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uint32_t suffix;
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} overflow_tracker __attribute__((section(".uninitialized")));
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void rtc_handler(nrfx_rtc_int_type_t int_type) {
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if (int_type == NRFX_RTC_INT_OVERFLOW) {
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// Our RTC is 24 bits and we're clocking it at 32.768khz which is 32 (2 ** 5) subticks per
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// tick.
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overflow_tracker.overflowed_ticks += (1L<< (24 - 5));
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} else if (int_type == NRFX_RTC_INT_TICK && nrfx_rtc_counter_get(&rtc_instance) % 32 == 0) {
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// Do things common to all ports when the tick occurs
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supervisor_tick();
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} else if (int_type == NRFX_RTC_INT_COMPARE0) {
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nrfx_rtc_cc_set(&rtc_instance, 0, 0, false);
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}
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}
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void tick_init(void) {
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if (!nrf_clock_lf_is_running(NRF_CLOCK)) {
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nrf_clock_task_trigger(NRF_CLOCK, NRF_CLOCK_TASK_LFCLKSTART);
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}
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nrfx_rtc_counter_clear(&rtc_instance);
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nrfx_rtc_init(&rtc_instance, &rtc_config, rtc_handler);
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nrfx_rtc_enable(&rtc_instance);
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nrfx_rtc_overflow_enable(&rtc_instance, true);
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// If the check prefix and suffix aren't correct, then the structure
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// in memory isn't correct and the clock will be wildly wrong. Initialize
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// the prefix and suffix so that we know the value is correct, and reset
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// the time to 0.
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if (overflow_tracker.prefix != OVERFLOW_CHECK_PREFIX ||
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overflow_tracker.suffix != OVERFLOW_CHECK_SUFFIX) {
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overflow_tracker.prefix = OVERFLOW_CHECK_PREFIX;
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overflow_tracker.suffix = OVERFLOW_CHECK_SUFFIX;
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overflow_tracker.overflowed_ticks = 0;
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}
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}
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safe_mode_t port_init(void) {
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nrf_peripherals_clocks_init();
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// If GPIO voltage is set wrong in UICR, this will fix it, and
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// will also do a reset to make the change take effect.
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nrf_peripherals_power_init();
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nrfx_power_pofwarn_config_t power_failure_config;
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power_failure_config.handler = power_warning_handler;
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power_failure_config.thr = NRF_POWER_POFTHR_V27;
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#if NRF_POWER_HAS_VDDH
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power_failure_config.thrvddh = NRF_POWER_POFTHRVDDH_V27;
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#endif
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nrfx_power_pof_init(&power_failure_config);
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nrfx_power_pof_enable(&power_failure_config);
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nrf_peripherals_enable_cache();
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// Configure millisecond timer initialization.
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tick_init();
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#if CIRCUITPY_RTC
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common_hal_rtc_init();
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#endif
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#if CIRCUITPY_ANALOGIO
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analogin_init();
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#endif
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// If the board was reset by the WatchDogTimer, we may
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// need to boot into safe mode. Reset the RESETREAS bit
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// for the WatchDogTimer so we don't encounter this the
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// next time we reboot.
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if (NRF_POWER->RESETREAS & POWER_RESETREAS_DOG_Msk) {
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NRF_POWER->RESETREAS = POWER_RESETREAS_DOG_Msk;
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uint32_t usb_reg = NRF_POWER->USBREGSTATUS;
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// If USB is connected, then the user might be editing `code.py`,
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// in which case we should reboot into Safe Mode.
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if (usb_reg & POWER_USBREGSTATUS_VBUSDETECT_Msk) {
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return WATCHDOG_RESET;
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}
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}
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return NO_SAFE_MODE;
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}
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void reset_port(void) {
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#ifdef CIRCUITPY_GAMEPAD_TICKS
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gamepad_reset();
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#endif
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#if CIRCUITPY_BUSIO
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i2c_reset();
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spi_reset();
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uart_reset();
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#endif
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#if CIRCUITPY_NEOPIXEL_WRITE
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neopixel_write_reset();
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#endif
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#if CIRCUITPY_AUDIOBUSIO
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i2s_reset();
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#endif
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#if CIRCUITPY_AUDIOPWMIO
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audiopwmout_reset();
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#endif
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#if CIRCUITPY_PULSEIO
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pwmout_reset();
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pulseout_reset();
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pulsein_reset();
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#endif
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#if CIRCUITPY_RTC
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rtc_reset();
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#endif
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timers_reset();
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#if CIRCUITPY_BLEIO
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bleio_reset();
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#endif
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#if CIRCUITPY_WATCHDOG
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watchdog_reset();
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#endif
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reset_all_pins();
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}
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void reset_to_bootloader(void) {
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enum { DFU_MAGIC_SERIAL = 0x4e };
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NRF_POWER->GPREGRET = DFU_MAGIC_SERIAL;
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reset_cpu();
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}
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void reset_cpu(void) {
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// We're getting ready to reset, so save the counter off.
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// This counter will get reset to zero during the reboot.
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uint32_t ticks = nrfx_rtc_counter_get(&rtc_instance);
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overflow_tracker.overflowed_ticks += ticks;
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NVIC_SystemReset();
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}
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// The uninitialized data section is placed directly after BSS, under the theory
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// that Circuit Python has a lot more .data and .bss than the bootloader. As a
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// result, this section is less likely to be tampered with by the bootloader.
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extern uint32_t _euninitialized;
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uint32_t *port_heap_get_bottom(void) {
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return &_euninitialized;
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}
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uint32_t *port_heap_get_top(void) {
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return port_stack_get_top();
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}
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supervisor_allocation* port_fixed_stack(void) {
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return NULL;
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}
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uint32_t *port_stack_get_limit(void) {
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return &_euninitialized;
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}
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uint32_t *port_stack_get_top(void) {
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return &_estack;
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}
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// Place the word in the uninitialized section so it won't get overwritten.
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__attribute__((section(".uninitialized"))) uint32_t _saved_word;
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void port_set_saved_word(uint32_t value) {
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_saved_word = value;
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}
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uint32_t port_get_saved_word(void) {
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return _saved_word;
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}
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uint64_t port_get_raw_ticks(uint8_t* subticks) {
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uint32_t rtc = nrfx_rtc_counter_get(&rtc_instance);
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if (subticks != NULL) {
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*subticks = (rtc % 32);
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}
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return overflow_tracker.overflowed_ticks + rtc / 32;
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}
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// Enable 1/1024 second tick.
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void port_enable_tick(void) {
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nrfx_rtc_tick_enable(&rtc_instance, true);
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}
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// Disable 1/1024 second tick.
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void port_disable_tick(void) {
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nrfx_rtc_tick_disable(&rtc_instance);
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}
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void port_interrupt_after_ticks(uint32_t ticks) {
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uint32_t current_ticks = nrfx_rtc_counter_get(&rtc_instance);
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uint32_t diff = 3;
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if (ticks > diff) {
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diff = ticks * 32;
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}
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if (diff > 0xffffff) {
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diff = 0xffffff;
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}
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nrfx_rtc_cc_set(&rtc_instance, 0, current_ticks + diff, true);
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}
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void port_sleep_until_interrupt(void) {
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// Clear the FPU interrupt because it can prevent us from sleeping.
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if (NVIC_GetPendingIRQ(FPU_IRQn)) {
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__set_FPSCR(__get_FPSCR() & ~(0x9f));
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(void) __get_FPSCR();
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NVIC_ClearPendingIRQ(FPU_IRQn);
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}
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uint8_t sd_enabled;
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sd_softdevice_is_enabled(&sd_enabled);
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if (sd_enabled) {
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sd_app_evt_wait();
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} else {
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// Call wait for interrupt ourselves if the SD isn't enabled.
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// Note that `wfi` should be called with interrupts disabled,
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// to ensure that the queue is properly drained. The `wfi`
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// instruction will returned as long as an interrupt is
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// available, even though the actual handler won't fire until
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// we re-enable interrupts.
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common_hal_mcu_disable_interrupts();
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if (!tud_task_event_ready()) {
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__DSB();
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__WFI();
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}
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common_hal_mcu_enable_interrupts();
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}
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}
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void HardFault_Handler(void) {
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reset_into_safe_mode(HARD_CRASH);
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while (true) {
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asm("nop;");
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}
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}
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