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main.c
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main.c
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// This file is part of the CircuitPython project: https://circuitpython.org
//
// SPDX-FileCopyrightText: Copyright (c) 2016-2017 Scott Shawcroft for Adafruit Industries
//
// SPDX-License-Identifier: MIT
#include <stdint.h>
#include <string.h>
#include "extmod/vfs.h"
#include "extmod/vfs_fat.h"
#include "genhdr/mpversion.h"
#include "py/nlr.h"
#include "py/compile.h"
#include "py/frozenmod.h"
#include "py/mphal.h"
#include "py/runtime.h"
#include "py/repl.h"
#include "py/gc.h"
#include "py/stackctrl.h"
#include "shared/readline/readline.h"
#include "shared/runtime/pyexec.h"
#include "background.h"
#include "mpconfigboard.h"
#include "supervisor/background_callback.h"
#include "supervisor/board.h"
#include "supervisor/cpu.h"
#include "supervisor/filesystem.h"
#include "supervisor/port.h"
#include "supervisor/shared/reload.h"
#include "supervisor/shared/safe_mode.h"
#include "supervisor/shared/serial.h"
#include "supervisor/shared/stack.h"
#include "supervisor/shared/status_leds.h"
#include "supervisor/shared/tick.h"
#include "supervisor/shared/traceback.h"
#include "supervisor/shared/workflow.h"
#include "supervisor/workflow.h"
#include "supervisor/shared/external_flash/external_flash.h"
#include "shared-bindings/microcontroller/__init__.h"
#include "shared-bindings/microcontroller/Processor.h"
#include "shared-bindings/supervisor/__init__.h"
#include "shared-bindings/supervisor/Runtime.h"
#include "shared-bindings/os/__init__.h"
#if CIRCUITPY_ALARM
#include "shared-bindings/alarm/__init__.h"
#endif
#if CIRCUITPY_ATEXIT
#include "shared-module/atexit/__init__.h"
#endif
#if CIRCUITPY_BLEIO
#include "shared-bindings/_bleio/__init__.h"
#include "supervisor/shared/bluetooth/bluetooth.h"
#endif
#if CIRCUITPY_BOARD
#include "shared-module/board/__init__.h"
#endif
#if CIRCUITPY_CANIO
#include "common-hal/canio/CAN.h"
#endif
#if CIRCUITPY_DISPLAYIO
#include "shared-module/displayio/__init__.h"
#include "shared-bindings/displayio/__init__.h"
#endif
#if CIRCUITPY_EPAPERDISPLAY
#include "shared-bindings/epaperdisplay/EPaperDisplay.h"
#endif
#if CIRCUITPY_KEYPAD
#include "shared-module/keypad/__init__.h"
#endif
#if CIRCUITPY_MEMORYMONITOR
#include "shared-module/memorymonitor/__init__.h"
#endif
#if CIRCUITPY_SOCKETPOOL
#include "shared-bindings/socketpool/__init__.h"
#endif
#if CIRCUITPY_STATUS_BAR
#include "supervisor/shared/status_bar.h"
#endif
#if CIRCUITPY_USB_DEVICE && CIRCUITPY_USB_HID
#include "shared-module/usb_hid/__init__.h"
#endif
#if CIRCUITPY_TINYUSB
#include "supervisor/usb.h"
#endif
#if CIRCUITPY_WIFI
#include "shared-bindings/wifi/__init__.h"
#endif
#if CIRCUITPY_BOOT_COUNTER
#include "shared-bindings/nvm/ByteArray.h"
uint8_t value_out = 0;
#endif
#if MICROPY_ENABLE_PYSTACK && CIRCUITPY_OS_GETENV
#include "shared-module/os/__init__.h"
#endif
static void reset_devices(void) {
#if CIRCUITPY_BLEIO_HCI
bleio_reset();
#endif
}
static uint8_t *_heap;
static uint8_t *_pystack;
static const char line_clear[] = "\x1b[2K\x1b[0G";
#if MICROPY_ENABLE_PYSTACK || MICROPY_ENABLE_GC
static uint8_t *_allocate_memory(safe_mode_t safe_mode, const char *env_key, size_t default_size, size_t *final_size) {
*final_size = default_size;
#if CIRCUITPY_OS_GETENV
if (safe_mode == SAFE_MODE_NONE) {
(void)common_hal_os_getenv_int(env_key, (mp_int_t *)final_size);
if (*final_size < 0) {
*final_size = default_size;
}
}
#endif
uint8_t *ptr = port_malloc(*final_size, false);
#if CIRCUITPY_OS_GETENV
if (ptr == NULL) {
// Fallback to the build size.
ptr = port_malloc(default_size, false);
}
#endif
if (ptr == NULL) {
reset_into_safe_mode(SAFE_MODE_NO_HEAP);
}
return ptr;
}
#endif
static void start_mp(safe_mode_t safe_mode) {
supervisor_workflow_reset();
// Stack limit should be less than real stack size, so we have a chance
// to recover from limit hit. (Limit is measured in bytes.) The top of the
// stack is set to our current state. Not the actual top.
mp_stack_ctrl_init();
uint32_t *stack_bottom = port_stack_get_limit();
uint32_t *stack_top = port_stack_get_top();
size_t stack_length = (stack_top - stack_bottom) * sizeof(uint32_t);
mp_stack_set_top(stack_top);
mp_stack_set_limit(stack_length - CIRCUITPY_EXCEPTION_STACK_SIZE);
#if MICROPY_MAX_STACK_USAGE
// _ezero (same as _ebss) is an int, so start 4 bytes above it.
if (stack_get_bottom() != NULL) {
mp_stack_set_bottom(stack_get_bottom());
mp_stack_fill_with_sentinel();
}
#endif
// Sync the file systems in case any used RAM from the GC to cache. As soon
// as we re-init the GC all bets are off on the cache.
filesystem_flush();
// Clear the readline history. It references the heap we're about to destroy.
readline_init0();
#if MICROPY_ENABLE_PYSTACK
size_t pystack_size = 0;
_pystack = _allocate_memory(safe_mode, "CIRCUITPY_PYSTACK_SIZE", CIRCUITPY_PYSTACK_SIZE, &pystack_size);
mp_pystack_init(_pystack, _pystack + pystack_size);
#endif
#if MICROPY_ENABLE_GC
size_t heap_size = 0;
_heap = _allocate_memory(safe_mode, "CIRCUITPY_HEAP_START_SIZE", CIRCUITPY_HEAP_START_SIZE, &heap_size);
gc_init(_heap, _heap + heap_size);
#endif
mp_init();
mp_obj_list_init((mp_obj_list_t *)mp_sys_path, 0);
mp_obj_list_append(mp_sys_path, MP_OBJ_NEW_QSTR(MP_QSTR_)); // current dir (or base dir of the script)
mp_obj_list_append(mp_sys_path, MP_OBJ_NEW_QSTR(MP_QSTR__slash_));
#if MICROPY_MODULE_FROZEN
mp_obj_list_append(mp_sys_path, MP_OBJ_NEW_QSTR(MP_QSTR__dot_frozen));
#endif
mp_obj_list_append(mp_sys_path, MP_OBJ_NEW_QSTR(MP_QSTR__slash_lib));
mp_obj_list_init((mp_obj_list_t *)mp_sys_argv, 0);
}
static void stop_mp(void) {
#if MICROPY_VFS
mp_vfs_mount_t *vfs = MP_STATE_VM(vfs_mount_table);
// Unmount all heap allocated vfs mounts.
while (gc_nbytes(vfs) > 0) {
vfs = vfs->next;
}
MP_STATE_VM(vfs_mount_table) = vfs;
MP_STATE_VM(vfs_cur) = vfs;
#endif
background_callback_reset();
#if CIRCUITPY_TINYUSB
usb_background();
#endif
// Set the qstr pool back to the const pools. The heap allocated ones will
// be overwritten.
qstr_reset();
gc_deinit();
port_free(_heap);
_heap = NULL;
#if MICROPY_ENABLE_PYSTACK
port_free(_pystack);
_pystack = NULL;
#endif
}
static const char *_current_executing_filename = NULL;
static pyexec_result_t _exec_result = {0, MP_OBJ_NULL, 0};
#if CIRCUITPY_STATUS_BAR
void supervisor_execution_status(void) {
mp_obj_exception_t *exception = MP_OBJ_TO_PTR(_exec_result.exception);
if (_current_executing_filename != NULL) {
serial_write(_current_executing_filename);
} else if ((_exec_result.return_code & PYEXEC_EXCEPTION) != 0 &&
_exec_result.exception_line > 0 &&
exception != NULL) {
mp_printf(&mp_plat_print, "%d@%s %q", _exec_result.exception_line, _exec_result.exception_filename, exception->base.type->name);
} else {
serial_write_compressed(MP_ERROR_TEXT("Done"));
}
}
#endif
#if CIRCUITPY_WATCHDOG
pyexec_result_t *pyexec_result(void) {
return &_exec_result;
}
#endif
// Look for the first file that exists in the list of filenames, using mp_import_stat().
// Return its index. If no file found, return -1.
static const char *first_existing_file_in_list(const char *const *filenames, size_t n_filenames) {
for (size_t i = 0; i < n_filenames; i++) {
mp_import_stat_t stat = mp_import_stat(filenames[i]);
if (stat == MP_IMPORT_STAT_FILE) {
return filenames[i];
}
}
return NULL;
}
static bool maybe_run_list(const char *const *filenames, size_t n_filenames) {
_exec_result.return_code = 0;
_exec_result.exception = MP_OBJ_NULL;
_exec_result.exception_line = 0;
_current_executing_filename = first_existing_file_in_list(filenames, n_filenames);
if (_current_executing_filename == NULL) {
return false;
}
// This function is used for `boot.py` and is thus logged to `boot_out.txt`.
// We do not want the line clear to be logged.
// The function `serial_write` is the only function that isn't logged into the file.
serial_write(line_clear);
mp_hal_stdout_tx_str(_current_executing_filename);
serial_write_compressed(MP_ERROR_TEXT(" output:\n"));
#if CIRCUITPY_STATUS_BAR
supervisor_status_bar_update();
#endif
pyexec_file(_current_executing_filename, &_exec_result);
#if CIRCUITPY_ATEXIT
shared_module_atexit_execute(&_exec_result);
#endif
_current_executing_filename = NULL;
#if CIRCUITPY_STATUS_BAR
supervisor_status_bar_update();
#endif
return true;
}
static void count_strn(void *data, const char *str, size_t len) {
*(size_t *)data += len;
}
static void cleanup_after_vm(mp_obj_t exception) {
// Get the traceback of any exception from this run off the heap.
// MP_OBJ_SENTINEL means "this run does not contribute to traceback storage, don't touch it"
// MP_OBJ_NULL (=0) means "this run completed successfully, clear any stored traceback"
if (exception != MP_OBJ_SENTINEL) {
if (prev_traceback_string != NULL) {
port_free(prev_traceback_string);
prev_traceback_string = NULL;
}
// ReloadException is exempt from traceback printing in pyexec_file(), so treat it as "no
// traceback" here too.
if (exception && exception != MP_OBJ_FROM_PTR(&MP_STATE_VM(mp_reload_exception))) {
size_t traceback_len = 0;
mp_print_t print_count = {&traceback_len, count_strn};
mp_obj_print_exception(&print_count, exception);
prev_traceback_string = (char *)port_malloc(traceback_len + 1, false);
// Empirically, this never fails in practice - even when the heap is totally filled up
// with single-block-sized objects referenced by a root pointer, exiting the VM frees
// up several hundred bytes, sufficient for the traceback (which tends to be shortened
// because there wasn't memory for the full one). There may be convoluted ways of
// making it fail, but at this point I believe they are not worth spending code on.
if (prev_traceback_string != NULL) {
vstr_t vstr;
vstr_init_fixed_buf(&vstr, traceback_len, prev_traceback_string);
mp_print_t print = {&vstr, (mp_print_strn_t)vstr_add_strn};
mp_obj_print_exception(&print, exception);
prev_traceback_string[traceback_len] = '\0';
}
}
}
// Reset port-independent devices, like CIRCUITPY_BLEIO_HCI.
reset_devices();
#if CIRCUITPY_ATEXIT
atexit_reset();
#endif
// Turn off the display and flush the filesystem before the heap disappears.
#if CIRCUITPY_DISPLAYIO
reset_displays();
#endif
#if CIRCUITPY_MEMORYMONITOR
memorymonitor_reset();
#endif
// Disable user related BLE state that uses the micropython heap.
#if CIRCUITPY_BLEIO
bleio_user_reset();
#endif
#if CIRCUITPY_CANIO
common_hal_canio_reset();
#endif
#if CIRCUITPY_KEYPAD
keypad_reset();
#endif
// Close user-initiated sockets.
#if CIRCUITPY_SOCKETPOOL
socketpool_user_reset();
#endif
// Turn off user initiated WiFi connections.
#if CIRCUITPY_WIFI
wifi_user_reset();
#endif
// reset_board_buses() first because it may release pins from the never_reset state, so that
// reset_port() can reset them.
#if CIRCUITPY_BOARD
reset_board_buses();
#endif
reset_port();
reset_board();
// Free the heap last because other modules may reference heap memory and need to shut down.
filesystem_flush();
stop_mp();
// Let the workflows know we've reset in case they want to restart.
supervisor_workflow_reset();
}
static void print_code_py_status_message(safe_mode_t safe_mode) {
mp_hal_stdout_tx_str(line_clear);
if (autoreload_is_enabled()) {
serial_write_compressed(
MP_ERROR_TEXT("Auto-reload is on. Simply save files over USB to run them or enter REPL to disable.\n"));
} else {
serial_write_compressed(MP_ERROR_TEXT("Auto-reload is off.\n"));
}
if (safe_mode != SAFE_MODE_NONE) {
serial_write_compressed(MP_ERROR_TEXT("Running in safe mode! Not running saved code.\n"));
}
}
static bool __attribute__((noinline)) run_code_py(safe_mode_t safe_mode, bool *simulate_reset) {
bool serial_connected_at_start = serial_connected();
bool printed_safe_mode_message = false;
#if CIRCUITPY_AUTORELOAD_DELAY_MS > 0
if (serial_connected_at_start) {
serial_write("\r\n");
print_code_py_status_message(safe_mode);
print_safe_mode_message(safe_mode);
printed_safe_mode_message = true;
}
#endif
bool skip_repl = false;
bool skip_wait = false;
bool found_main = false;
uint8_t next_code_options = 0;
// Collects stickiness bits that apply in the current situation.
uint8_t next_code_stickiness_situation = SUPERVISOR_NEXT_CODE_OPT_NEWLY_SET;
// Do the filesystem flush check before reload in case another write comes
// in while we're doing the flush.
if (safe_mode == SAFE_MODE_NONE) {
filesystem_flush();
}
if (safe_mode == SAFE_MODE_NONE && !autoreload_pending()) {
static const char *const supported_filenames[] = {
"code.txt", "code.py", "main.py", "main.txt"
};
#if CIRCUITPY_FULL_BUILD
static const char *const double_extension_filenames[] = {
"code.txt.py", "code.py.txt", "code.txt.txt", "code.py.py",
"main.txt.py", "main.py.txt", "main.txt.txt", "main.py.py"
};
#endif
start_mp(safe_mode);
#if CIRCUITPY_USB_DEVICE
usb_setup_with_vm();
#endif
// Check if a different run file has been allocated
if (next_code_configuration != NULL) {
next_code_configuration->options &= ~SUPERVISOR_NEXT_CODE_OPT_NEWLY_SET;
next_code_options = next_code_configuration->options;
if (next_code_configuration->filename[0] != '\0') {
// This is where the user's python code is actually executed:
const char *const filenames[] = { next_code_configuration->filename };
found_main = maybe_run_list(filenames, MP_ARRAY_SIZE(filenames));
if (!found_main) {
serial_write(next_code_configuration->filename);
serial_write_compressed(MP_ERROR_TEXT(" not found.\n"));
}
}
}
// Otherwise, default to the standard list of filenames
if (!found_main) {
// This is where the user's python code is actually executed:
found_main = maybe_run_list(supported_filenames, MP_ARRAY_SIZE(supported_filenames));
// If that didn't work, double check the extensions
#if CIRCUITPY_FULL_BUILD
if (!found_main) {
found_main = maybe_run_list(double_extension_filenames, MP_ARRAY_SIZE(double_extension_filenames));
if (found_main) {
serial_write_compressed(MP_ERROR_TEXT("WARNING: Your code filename has two extensions\n"));
}
}
#else
(void)found_main;
#endif
}
// Print done before resetting everything so that we get the message over
// BLE before it is reset and we have a delay before reconnect.
if ((_exec_result.return_code & PYEXEC_RELOAD) && supervisor_get_run_reason() == RUN_REASON_AUTO_RELOAD) {
serial_write_compressed(MP_ERROR_TEXT("\nCode stopped by auto-reload. Reloading soon.\n"));
} else {
serial_write_compressed(MP_ERROR_TEXT("\nCode done running.\n"));
}
// Finished executing python code. Cleanup includes filesystem flush and a board reset.
cleanup_after_vm(_exec_result.exception);
_exec_result.exception = NULL;
// If a new next code file was set, that is a reason to keep it (obviously). Stuff this into
// the options because it can be treated like any other reason-for-stickiness bit. The
// source is different though: it comes from the options that will apply to the next run,
// while the rest of next_code_options is what applied to this run.
if (next_code_configuration != NULL &&
next_code_configuration->options & SUPERVISOR_NEXT_CODE_OPT_NEWLY_SET) {
next_code_configuration->options |= SUPERVISOR_NEXT_CODE_OPT_NEWLY_SET;
}
if (_exec_result.return_code & PYEXEC_RELOAD) {
next_code_stickiness_situation |= SUPERVISOR_NEXT_CODE_OPT_STICKY_ON_RELOAD;
// Reload immediately unless the reload is due to autoreload. In that
// case, we wait below to see if any other writes occur.
if (supervisor_get_run_reason() != RUN_REASON_AUTO_RELOAD) {
skip_repl = true;
skip_wait = true;
}
} else if (_exec_result.return_code == 0) {
next_code_stickiness_situation |= SUPERVISOR_NEXT_CODE_OPT_STICKY_ON_SUCCESS;
if (next_code_options & SUPERVISOR_NEXT_CODE_OPT_RELOAD_ON_SUCCESS) {
skip_repl = true;
skip_wait = true;
}
} else {
next_code_stickiness_situation |= SUPERVISOR_NEXT_CODE_OPT_STICKY_ON_ERROR;
// Deep sleep cannot be skipped
// TODO: settings in deep sleep should persist, using a new sleep memory API
if (next_code_options & SUPERVISOR_NEXT_CODE_OPT_RELOAD_ON_ERROR
&& !(_exec_result.return_code & PYEXEC_DEEP_SLEEP)) {
skip_repl = true;
skip_wait = true;
}
}
if (_exec_result.return_code & PYEXEC_FORCED_EXIT) {
skip_repl = false;
skip_wait = true;
}
}
// Program has finished running.
bool printed_press_any_key = false;
#if CIRCUITPY_EPAPERDISPLAY
size_t time_to_epaper_refresh = 1;
#endif
// Setup LED blinks.
#if CIRCUITPY_STATUS_LED
uint32_t color;
uint8_t blink_count;
bool led_active = false;
#if CIRCUITPY_ALARM
if (_exec_result.return_code & PYEXEC_DEEP_SLEEP) {
color = BLACK;
blink_count = 0;
} else
#endif
if (_exec_result.return_code != PYEXEC_EXCEPTION) {
if (safe_mode == SAFE_MODE_NONE) {
color = ALL_DONE;
blink_count = ALL_DONE_BLINKS;
} else {
color = SAFE_MODE;
blink_count = SAFE_MODE_BLINKS;
}
} else {
color = EXCEPTION;
blink_count = EXCEPTION_BLINKS;
}
size_t pattern_start = supervisor_ticks_ms32();
size_t single_blink_time = (OFF_ON_RATIO + 1) * BLINK_TIME_MS;
size_t blink_time = single_blink_time * blink_count;
size_t total_time = blink_time + LED_SLEEP_TIME_MS;
#endif
// This loop is waits after code completes. It waits for fake sleeps to
// finish, user input or autoreloads.
#if CIRCUITPY_ALARM
bool fake_sleeping = false;
#endif
while (!skip_wait) {
RUN_BACKGROUND_TASKS;
// If a reload was requested by the supervisor or autoreload, return.
if (autoreload_ready()) {
next_code_stickiness_situation |= SUPERVISOR_NEXT_CODE_OPT_STICKY_ON_RELOAD;
// Should the STICKY_ON_SUCCESS and STICKY_ON_ERROR bits be cleared in
// next_code_stickiness_situation? I can see arguments either way, but I'm deciding
// "no" for now, mainly because it's a bit less code. At this point, we have both a
// success or error and a reload, so let's have both of the respective options take
// effect (in OR combination).
skip_repl = true;
// We're kicking off the autoreload process so reset now. If any
// other reloads trigger after this, then we'll want another wait
// period.
autoreload_reset();
break;
}
// If interrupted by keyboard, return
if (serial_connected() && serial_bytes_available() && !autoreload_pending()) {
// Skip REPL if reload was requested.
skip_repl = serial_read() == CHAR_CTRL_D;
if (skip_repl) {
supervisor_set_run_reason(RUN_REASON_REPL_RELOAD);
}
break;
}
// Check for a deep sleep alarm and restart the VM. This can happen if
// an alarm alerts faster than our USB delay or if we pretended to deep
// sleep.
#if CIRCUITPY_ALARM
if (fake_sleeping && common_hal_alarm_woken_from_sleep()) {
serial_write_compressed(MP_ERROR_TEXT("Woken up by alarm.\n"));
supervisor_set_run_reason(RUN_REASON_STARTUP);
skip_repl = true;
break;
}
#endif
// If messages haven't been printed yet, print them
if (!printed_press_any_key && serial_connected() && !autoreload_pending()) {
if (!serial_connected_at_start) {
print_code_py_status_message(safe_mode);
}
if (!printed_safe_mode_message) {
print_safe_mode_message(safe_mode);
printed_safe_mode_message = true;
}
serial_write("\r\n");
serial_write_compressed(MP_ERROR_TEXT("Press any key to enter the REPL. Use CTRL-D to reload.\n"));
printed_press_any_key = true;
}
if (!serial_connected()) {
serial_connected_at_start = false;
printed_press_any_key = false;
}
// Sleep until our next interrupt.
#if CIRCUITPY_ALARM
if (_exec_result.return_code & PYEXEC_DEEP_SLEEP) {
const bool awoke_from_true_deep_sleep =
common_hal_mcu_processor_get_reset_reason() == RESET_REASON_DEEP_SLEEP_ALARM;
if (fake_sleeping) {
// This waits until a pretend deep sleep alarm occurs. They are set
// during common_hal_alarm_set_deep_sleep_alarms. On some platforms
// it may also return due to another interrupt, that's why we check
// for deep sleep alarms above. If it wasn't a deep sleep alarm,
// then we'll idle here again.
common_hal_alarm_pretending_deep_sleep();
}
// The first time we go into a deep sleep, make sure we have been awake long enough
// for USB to connect (enumeration delay), or for the BLE workflow to start.
// We wait CIRCUITPY_WORKFLOW_CONNECTION_SLEEP_DELAY seconds after a restart.
// But if we woke up from a real deep sleep, don't wait for connection. The user will need to
// do a hard reset to get out of the real deep sleep.
else if (awoke_from_true_deep_sleep ||
port_get_raw_ticks(NULL) > CIRCUITPY_WORKFLOW_CONNECTION_SLEEP_DELAY * 1024) {
// OK to start sleeping, real or fake.
#if CIRCUITPY_DISPLAYIO
common_hal_displayio_release_displays();
#endif
status_led_deinit();
deinit_rxtx_leds();
board_deinit();
// Continue with true deep sleep even if workflow is available.
if (awoke_from_true_deep_sleep || !supervisor_workflow_active()) {
// Enter true deep sleep. When we wake up we'll be back at the
// top of main(), not in this loop.
common_hal_alarm_enter_deep_sleep();
// Does not return.
} else {
serial_write_compressed(
MP_ERROR_TEXT("Pretending to deep sleep until alarm, CTRL-C or file write.\n"));
fake_sleeping = true;
}
} else {
// Loop while checking the time. We can't idle because we don't want to override a
// time alarm set for the deep sleep.
}
} else
#endif
{
// Refresh the ePaper display if we have one. That way it'll show an error message.
// Skip if we're about to autoreload. Otherwise we may delay when user code can update
// the display.
#if CIRCUITPY_EPAPERDISPLAY
if (time_to_epaper_refresh > 0 && !autoreload_pending()) {
time_to_epaper_refresh = maybe_refresh_epaperdisplay();
}
#if !CIRCUITPY_STATUS_LED
port_interrupt_after_ticks(time_to_epaper_refresh);
#endif
#endif
#if CIRCUITPY_STATUS_LED
uint32_t tick_diff = supervisor_ticks_ms32() - pattern_start;
// By default, don't sleep.
size_t time_to_next_change = 0;
if (tick_diff < blink_time) {
uint32_t blink_diff = tick_diff % (single_blink_time);
if (blink_diff >= BLINK_TIME_MS) {
if (led_active) {
new_status_color(BLACK);
status_led_deinit();
led_active = false;
}
time_to_next_change = single_blink_time - blink_diff;
} else {
if (!led_active) {
status_led_init();
new_status_color(color);
led_active = true;
}
time_to_next_change = BLINK_TIME_MS - blink_diff;
}
} else if (tick_diff > total_time) {
pattern_start = supervisor_ticks_ms32();
} else {
if (led_active) {
new_status_color(BLACK);
status_led_deinit();
led_active = false;
}
time_to_next_change = total_time - tick_diff;
}
#if CIRCUITPY_EPAPERDISPLAY
if (time_to_epaper_refresh > 0 && time_to_next_change > 0) {
time_to_next_change = MIN(time_to_next_change, time_to_epaper_refresh);
}
#endif
// time_to_next_change is in ms and ticks are slightly shorter so
// we'll undersleep just a little. It shouldn't matter.
if (time_to_next_change > 0) {
port_interrupt_after_ticks(time_to_next_change);
port_idle_until_interrupt();
}
#else
// No status LED can we sleep until we are interrupted by some
// interaction.
port_idle_until_interrupt();
#endif
}
}
// Done waiting, start the board back up.
// We delay resetting BLE until after the wait in case we're transferring
// more files over.
#if CIRCUITPY_BLEIO
bleio_reset();
#endif
// free code allocation if unused
if (next_code_configuration != NULL && (next_code_configuration->options & next_code_stickiness_situation) == 0) {
port_free(next_code_configuration);
next_code_configuration = NULL;
}
#if CIRCUITPY_STATUS_LED
if (led_active) {
new_status_color(BLACK);
status_led_deinit();
}
#endif
#if CIRCUITPY_ALARM
if (fake_sleeping) {
board_init();
// Pretend that the next run is the first run, as if we were reset.
*simulate_reset = true;
}
#endif
return skip_repl;
}
vstr_t *boot_output;
#if CIRCUITPY_SAFEMODE_PY
static void __attribute__ ((noinline)) run_safemode_py(safe_mode_t safe_mode) {
// Don't run if we aren't in safe mode or we won't be able to find safemode.py.
// Also don't run if it's a user-initiated safemode (pressing button(s) during boot),
// since that's deliberate.
if (safe_mode == SAFE_MODE_NONE || safe_mode == SAFE_MODE_USER || !filesystem_present()) {
return;
}
start_mp(safe_mode);
static const char *const safemode_py_filenames[] = {"safemode.py", "safemode.txt"};
maybe_run_list(safemode_py_filenames, MP_ARRAY_SIZE(safemode_py_filenames));
// If safemode.py itself caused an error, change the safe_mode state to indicate that.
if (_exec_result.exception != MP_OBJ_NULL &&
_exec_result.exception != MP_OBJ_SENTINEL) {
set_safe_mode(SAFE_MODE_SAFEMODE_PY_ERROR);
}
cleanup_after_vm(_exec_result.exception);
_exec_result.exception = NULL;
}
#endif
static void __attribute__ ((noinline)) run_boot_py(safe_mode_t safe_mode) {
if (safe_mode == SAFE_MODE_NO_HEAP) {
return;
}
// If not in safe mode, run boot before initing USB and capture output in a file.
// There is USB setup to do even if boot.py is not actually run.
const bool ok_to_run = filesystem_present()
&& safe_mode == SAFE_MODE_NONE
&& MP_STATE_VM(vfs_mount_table) != NULL;
static const char *const boot_py_filenames[] = {"boot.py", "boot.txt"};
// Do USB setup even if boot.py is not run.
start_mp(safe_mode);
#if CIRCUITPY_USB_DEVICE
// Set up default USB values after boot.py VM starts but before running boot.py.
usb_set_defaults();
#endif
if (ok_to_run) {
#ifdef CIRCUITPY_BOOT_OUTPUT_FILE
#if CIRCUITPY_STATUS_BAR
// Turn off status bar updates when writing out to boot_out.txt.
supervisor_status_bar_suspend();
#endif
vstr_t boot_text;
vstr_init(&boot_text, 512);
boot_output = &boot_text;
#endif
// Write version info
mp_printf(&mp_plat_print, "%s\nBoard ID:%s\n", MICROPY_FULL_VERSION_INFO, CIRCUITPY_BOARD_ID);
#if CIRCUITPY_MICROCONTROLLER && COMMON_HAL_MCU_PROCESSOR_UID_LENGTH > 0
uint8_t raw_id[COMMON_HAL_MCU_PROCESSOR_UID_LENGTH];
common_hal_mcu_processor_get_uid(raw_id);
mp_cprintf(&mp_plat_print, MP_ERROR_TEXT("UID:"));
for (size_t i = 0; i < COMMON_HAL_MCU_PROCESSOR_UID_LENGTH; i++) {
mp_cprintf(&mp_plat_print, MP_ERROR_TEXT("%02X"), raw_id[i]);
}
mp_printf(&mp_plat_print, "\n");
port_boot_info();
#endif
bool found_boot = maybe_run_list(boot_py_filenames, MP_ARRAY_SIZE(boot_py_filenames));
(void)found_boot;
#ifdef CIRCUITPY_BOOT_OUTPUT_FILE
// Get the base filesystem.
fs_user_mount_t *vfs = (fs_user_mount_t *)MP_STATE_VM(vfs_mount_table)->obj;
FATFS *fs = &vfs->fatfs;
boot_output = NULL;
#if CIRCUITPY_STATUS_BAR
supervisor_status_bar_resume();
#endif
bool write_boot_output = true;
FIL boot_output_file;
if (f_open(fs, &boot_output_file, CIRCUITPY_BOOT_OUTPUT_FILE, FA_READ) == FR_OK) {
char *file_contents = m_new(char, boot_text.alloc);
UINT chars_read;
if (f_read(&boot_output_file, file_contents, 1 + boot_text.len, &chars_read) == FR_OK) {
write_boot_output =
(chars_read != boot_text.len) || (memcmp(boot_text.buf, file_contents, chars_read) != 0);
}
// no need to f_close the file
}
if (write_boot_output) {
// Wait 1 second before opening CIRCUITPY_BOOT_OUTPUT_FILE for write,
// in case power is momentary or will fail shortly due to, say a low, battery.
mp_hal_delay_ms(1000);
// USB isn't up, so we can write the file.
// operating at the oofatfs (f_open) layer means the usb concurrent write permission
// is not even checked!
f_open(fs, &boot_output_file, CIRCUITPY_BOOT_OUTPUT_FILE, FA_WRITE | FA_CREATE_ALWAYS);
UINT chars_written;
f_write(&boot_output_file, boot_text.buf, boot_text.len, &chars_written);
f_close(&boot_output_file);
filesystem_flush();
}
#endif
}
port_post_boot_py(true);
cleanup_after_vm(_exec_result.exception);
_exec_result.exception = NULL;
port_post_boot_py(false);
}
static int run_repl(safe_mode_t safe_mode) {
int exit_code = PYEXEC_FORCED_EXIT;
filesystem_flush();
start_mp(safe_mode);
#if CIRCUITPY_USB_DEVICE
usb_setup_with_vm();
#endif
autoreload_suspend(AUTORELOAD_SUSPEND_REPL);
if (get_safe_mode() == SAFE_MODE_NONE) {
const char *const filenames[] = { "repl.py" };
(void)maybe_run_list(filenames, MP_ARRAY_SIZE(filenames));
}
// Set the status LED to the REPL color before running the REPL. For
// NeoPixels and DotStars this will be sticky but for PWM or single LED it
// won't. This simplifies pin sharing because they won't be in use when
// actually in the REPL.
#if CIRCUITPY_STATUS_LED
status_led_init();
new_status_color(REPL_RUNNING);
status_led_deinit();
#endif
if (pyexec_mode_kind == PYEXEC_MODE_RAW_REPL) {
#if CIRCUITPY_STATUS_BAR
supervisor_status_bar_suspend();
#endif
exit_code = pyexec_raw_repl();
#if CIRCUITPY_STATUS_BAR
supervisor_status_bar_resume();
#endif
} else {
_current_executing_filename = "REPL";
#if CIRCUITPY_STATUS_BAR
supervisor_status_bar_update();
#endif
exit_code = pyexec_friendly_repl();
_current_executing_filename = NULL;
#if CIRCUITPY_STATUS_BAR
supervisor_status_bar_update();
#endif
}
#if CIRCUITPY_ATEXIT
pyexec_result_t result;
shared_module_atexit_execute(&result);
if (result.return_code == PYEXEC_DEEP_SLEEP) {
exit_code = PYEXEC_DEEP_SLEEP;
}
#endif
cleanup_after_vm(MP_OBJ_SENTINEL);
// Also reset bleio. The above call omits it in case workflows should continue. In this case,
// we're switching straight to another VM so we want to reset.
#if CIRCUITPY_BLEIO
bleio_reset();
#endif
#if CIRCUITPY_STATUS_LED
status_led_init();
new_status_color(BLACK);
status_led_deinit();
#endif
autoreload_resume(AUTORELOAD_SUSPEND_REPL);
return exit_code;
}
int __attribute__((used)) main(void) {
// initialise the cpu and peripherals
set_safe_mode(port_init());
port_heap_init();
// Turn on RX and TX LEDs if we have them.
init_rxtx_leds();
#if CIRCUITPY_BOOT_COUNTER
// Increment counter before possibly entering safe mode
common_hal_nvm_bytearray_get_bytes(&common_hal_mcu_nvm_obj, 0, 1, &value_out);
++value_out;
common_hal_nvm_bytearray_set_bytes(&common_hal_mcu_nvm_obj, 0, &value_out, 1);
#endif
// Start the debug serial
serial_early_init();
mp_hal_stdout_tx_str(line_clear);
// Wait briefly to give a reset window where we'll enter safe mode after the reset.
if (get_safe_mode() == SAFE_MODE_NONE) {
set_safe_mode(wait_for_safe_mode_reset());