Further refine autoreload

locale/circuitpython.pot

@@ -25,7 +25,7 @@ msgstr ""
 #: main.c
 msgid ""
 "\n"
-"Code stopped by auto-reload.\n"
+"Code stopped by auto-reload. Reloading soon.\n"
 msgstr ""
 
 #: supervisor/shared/safe_mode.c
@@ -584,10 +584,6 @@ msgstr ""
 msgid "Brightness must be 0-1.0"
 msgstr ""
 
-#: shared-bindings/supervisor/__init__.c
-msgid "Brightness must be between 0 and 255"
-msgstr ""
-
 #: shared-bindings/displayio/Display.c
 #: shared-bindings/framebufferio/FramebufferDisplay.c
 msgid "Brightness not adjustable"
@@ -688,6 +684,7 @@ msgstr ""
 msgid "Can only alarm on two low pins from deep sleep."
 msgstr ""
 
+#: ports/espressif/common-hal/_bleio/Characteristic.c
 #: ports/nrf/common-hal/_bleio/Characteristic.c
 msgid "Can't set CCCD on local Characteristic"
 msgstr ""
@@ -1605,6 +1602,7 @@ msgstr ""
 msgid "Nimble out of memory"
 msgstr ""
 
+#: ports/espressif/common-hal/_bleio/Characteristic.c
 #: ports/nrf/common-hal/_bleio/Characteristic.c
 msgid "No CCCD for this Characteristic"
 msgstr ""
@@ -3642,7 +3640,7 @@ msgstr ""
 msgid "matrix is not positive definite"
 msgstr ""
 
-#: shared-bindings/wifi/Radio.c
+#: ports/espressif/common-hal/wifi/Radio.c
 msgid "max_connections must be between 0 and 10"
 msgstr ""
 
@@ -4061,13 +4059,15 @@ msgstr ""
 #: ports/espressif/boards/adafruit_metro_esp32s2/mpconfigboard.h
 #: ports/espressif/boards/adafruit_qtpy_esp32s2/mpconfigboard.h
 #: ports/espressif/boards/adafruit_qtpy_esp32s3_nopsram/mpconfigboard.h
+#: ports/espressif/boards/ai_thinker_esp32-c3s-2m/mpconfigboard.h
 #: ports/espressif/boards/ai_thinker_esp32-c3s/mpconfigboard.h
 #: ports/espressif/boards/ai_thinker_esp_12k_nodemcu/mpconfigboard.h
 #: ports/espressif/boards/artisense_rd00/mpconfigboard.h
 #: ports/espressif/boards/atmegazero_esp32s2/mpconfigboard.h
 #: ports/espressif/boards/crumpspace_crumps2/mpconfigboard.h
 #: ports/espressif/boards/electroniccats_bastwifi/mpconfigboard.h
 #: ports/espressif/boards/espressif_esp32c3_devkitm_1_n4/mpconfigboard.h
+#: ports/espressif/boards/espressif_esp32s2_devkitc_1_n4r2/mpconfigboard.h
 #: ports/espressif/boards/espressif_esp32s3_box/mpconfigboard.h
 #: ports/espressif/boards/espressif_esp32s3_devkitc_1_n8/mpconfigboard.h
 #: ports/espressif/boards/espressif_esp32s3_devkitc_1_n8r2/mpconfigboard.h
@@ -4083,6 +4083,7 @@ msgstr ""
 #: ports/espressif/boards/gravitech_cucumber_ms/mpconfigboard.h
 #: ports/espressif/boards/gravitech_cucumber_r/mpconfigboard.h
 #: ports/espressif/boards/gravitech_cucumber_rs/mpconfigboard.h
+#: ports/espressif/boards/hiibot_iots2/mpconfigboard.h
 #: ports/espressif/boards/lilygo_ttgo_t8_s2_st7789/mpconfigboard.h
 #: ports/espressif/boards/lolin_s2_mini/mpconfigboard.h
 #: ports/espressif/boards/lolin_s2_pico/mpconfigboard.h

main.c

@@ -124,7 +124,6 @@ static void reset_devices(void) {
 }
 
 STATIC void start_mp(supervisor_allocation *heap, bool first_run) {
-    autoreload_reset();
     supervisor_workflow_reset();
 
     // Stack limit should be less than real stack size, so we have a chance
@@ -336,7 +335,13 @@ STATIC bool run_code_py(safe_mode_t safe_mode, bool first_run, bool *simulate_re
     // 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 == NO_SAFE_MODE) {
+        stack_resize();
+        filesystem_flush();
+    }
+    if (safe_mode == NO_SAFE_MODE && !autoreload_pending()) {
         static const char *const supported_filenames[] = STRING_LIST(
             "code.txt", "code.py", "main.py", "main.txt");
         #if CIRCUITPY_FULL_BUILD
@@ -345,8 +350,6 @@ STATIC bool run_code_py(safe_mode_t safe_mode, bool first_run, bool *simulate_re
             "main.txt.py", "main.py.txt", "main.txt.txt","main.py.py");
         #endif
 
-        stack_resize();
-        filesystem_flush();
         supervisor_allocation *heap = allocate_remaining_memory();
 
         // Prepare the VM state. Includes an alarm check/reset for sleep.
@@ -390,22 +393,7 @@ STATIC bool run_code_py(safe_mode_t safe_mode, bool first_run, bool *simulate_re
         // 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 ((result.return_code & PYEXEC_RELOAD) && supervisor_get_run_reason() == RUN_REASON_AUTO_RELOAD) {
-            serial_write_compressed(translate("\nCode stopped by auto-reload.\n"));
-
-            // Wait for autoreload interval before reloading
-            uint64_t start_ticks = 0;
-            do {
-                // Start waiting, or restart interval if another reload request was initiated
-                // while we were waiting.
-                if (reload_requested) {
-                    reload_requested = false;
-                    start_ticks = supervisor_ticks_ms64();
-                }
-                RUN_BACKGROUND_TASKS;
-            } while (supervisor_ticks_ms64() - start_ticks < CIRCUITPY_AUTORELOAD_DELAY_MS);
-
-            // Restore request for use below.
-            reload_requested = true;
+            serial_write_compressed(translate("\nCode stopped by auto-reload. Reloading soon.\n"));
         } else {
             serial_write_compressed(translate("\nCode done running.\n"));
         }
@@ -425,8 +413,6 @@ STATIC bool run_code_py(safe_mode_t safe_mode, bool first_run, bool *simulate_re
 
         if (result.return_code & PYEXEC_RELOAD) {
             next_code_stickiness_situation |= SUPERVISOR_NEXT_CODE_OPT_STICKY_ON_RELOAD;
-            skip_repl = true;
-            skip_wait = true;
         } else if (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) {
@@ -484,22 +470,27 @@ STATIC bool run_code_py(safe_mode_t safe_mode, bool first_run, bool *simulate_re
     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 (reload_requested) {
+        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).
-            reload_requested = false;
             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;
         }
 
@@ -526,7 +517,7 @@ STATIC bool run_code_py(safe_mode_t safe_mode, bool first_run, bool *simulate_re
         #endif
 
         // If messages haven't been printed yet, print them
-        if (!printed_press_any_key && serial_connected()) {
+        if (!printed_press_any_key && serial_connected() && !autoreload_pending()) {
             if (!serial_connected_at_start) {
                 print_code_py_status_message(safe_mode);
             }

ports/stm/supervisor/port.c

@@ -346,8 +346,6 @@ void port_enable_tick(void) {
     stm32_peripherals_rtc_assign_wkup_callback(supervisor_tick);
     stm32_peripherals_rtc_enable_wakeup_timer();
 }
-// TODO: what is this? can I get rid of it?
-extern volatile uint32_t autoreload_delay_ms;
 
 // Disable 1/1024 second tick.
 void port_disable_tick(void) {

shared-module/displayio/__init__.c

@@ -82,7 +82,7 @@ void displayio_background(void) {
     if (mp_hal_is_interrupted()) {
         return;
     }
-    if (reload_requested) {
+    if (autoreload_ready()) {
         // Reload is about to happen, so don't redisplay.
         return;
     }

supervisor/shared/bluetooth/file_transfer.c

@@ -325,8 +325,7 @@ STATIC uint8_t _process_write(const uint8_t *raw_buf, size_t command_len) {
     if (chunk_size == 0) {
         // Don't reload until everything is written out of the packet buffer.
         common_hal_bleio_packet_buffer_flush(&_transfer_packet_buffer);
-        // Trigger an autoreload
-        autoreload_start();
+        autoreload_trigger();
         return ANY_COMMAND;
     }
 
@@ -383,8 +382,7 @@ STATIC uint8_t _process_write_data(const uint8_t *raw_buf, size_t command_len) {
         #endif
         // Don't reload until everything is written out of the packet buffer.
         common_hal_bleio_packet_buffer_flush(&_transfer_packet_buffer);
-        // Trigger an autoreload
-        autoreload_start();
+        autoreload_trigger();
         return ANY_COMMAND;
     }
     return WRITE_DATA;
@@ -465,8 +463,7 @@ STATIC uint8_t _process_delete(const uint8_t *raw_buf, size_t command_len) {
     if (result == FR_OK) {
         // Don't reload until everything is written out of the packet buffer.
         common_hal_bleio_packet_buffer_flush(&_transfer_packet_buffer);
-        // Trigger an autoreload
-        autoreload_start();
+        autoreload_trigger();
     }
     return ANY_COMMAND;
 }
@@ -520,8 +517,7 @@ STATIC uint8_t _process_mkdir(const uint8_t *raw_buf, size_t command_len) {
     if (result == FR_OK) {
         // Don't reload until everything is written out of the packet buffer.
         common_hal_bleio_packet_buffer_flush(&_transfer_packet_buffer);
-        // Trigger an autoreload
-        autoreload_start();
+        autoreload_trigger();
     }
     return ANY_COMMAND;
 }
@@ -668,8 +664,7 @@ STATIC uint8_t _process_move(const uint8_t *raw_buf, size_t command_len) {
     if (result == FR_OK) {
         // Don't reload until everything is written out of the packet buffer.
         common_hal_bleio_packet_buffer_flush(&_transfer_packet_buffer);
-        // Trigger an autoreload
-        autoreload_start();
+        autoreload_trigger();
     }
     return ANY_COMMAND;
 }

supervisor/shared/reload.c

@@ -40,11 +40,9 @@ static bool autoreload_enabled = false;
 // Non-zero if autoreload is temporarily off, due to an AUTORELOAD_SUSPEND_... reason.
 static uint32_t autoreload_suspended = 0;
 
-// True if something has requested a reload/restart.
-volatile bool reload_requested = false;
+volatile uint32_t last_autoreload_trigger = 0;
 
 void reload_initiate(supervisor_run_reason_t run_reason) {
-    reload_requested = true;
     supervisor_set_run_reason(run_reason);
 
     // Raise reload exception, in case code is running.
@@ -57,12 +55,12 @@ void reload_initiate(supervisor_run_reason_t run_reason) {
 }
 
 void autoreload_reset() {
-    reload_requested = false;
+    last_autoreload_trigger = 0;
 }
 
 void autoreload_enable() {
     autoreload_enabled = true;
-    reload_requested = false;
+    last_autoreload_trigger = 0;
 }
 
 void autoreload_disable() {
@@ -81,8 +79,35 @@ inline bool autoreload_is_enabled() {
     return autoreload_enabled;
 }
 
-void autoreload_start() {
-    if (autoreload_enabled && autoreload_suspended == 0) {
+void autoreload_trigger() {
+    if (autoreload_enabled) {
+        last_autoreload_trigger = supervisor_ticks_ms32();
+        // Guard against the rare time that ticks is 0;
+        if (last_autoreload_trigger == 0) {
+            last_autoreload_trigger += 1;
+        }
+        // Initiate a reload of the VM immediately. Later code will pause to
+        // wait for the autoreload to become ready. Doing the VM exit
+        // immediately is clearer for the user.
         reload_initiate(RUN_REASON_AUTO_RELOAD);
     }
 }
+
+bool autoreload_ready() {
+    if (last_autoreload_trigger == 0 || autoreload_suspended != 0) {
+        return false;
+    }
+    // Wait for autoreload interval before reloading
+    uint32_t now = supervisor_ticks_ms32();
+    uint32_t diff;
+    if (now >= last_autoreload_trigger) {
+        diff = now - last_autoreload_trigger;
+    } else {
+        diff = now + (0xffffffff - last_autoreload_trigger);
+    }
+    return diff > CIRCUITPY_AUTORELOAD_DELAY_MS;
+}
+
+bool autoreload_pending(void) {
+    return last_autoreload_trigger != 0;
+}

supervisor/shared/reload.h

@@ -42,7 +42,8 @@ enum {
 
 enum {
     AUTORELOAD_SUSPEND_REPL = 0x1,
-    AUTORELOAD_SUSPEND_BLE = 0x2
+    AUTORELOAD_SUSPEND_BLE = 0x2,
+    AUTORELOAD_SUSPEND_USB = 0x4
 };
 
 typedef struct {
@@ -52,17 +53,29 @@ typedef struct {
 
 extern supervisor_allocation *next_code_allocation;
 
-extern volatile bool reload_requested;
-
+// Helper for exiting the VM and reloading immediately.
 void reload_initiate(supervisor_run_reason_t run_reason);
 
-void autoreload_start(void);
-void autoreload_reset(void);
+// Enabled state is user controllable and very sticky. We don't reset it.
 void autoreload_enable(void);
 void autoreload_disable(void);
 bool autoreload_is_enabled(void);
 
-// Temporarily turn autoreload off, for the given reason(s).
+// Start the autoreload process.
+void autoreload_trigger(void);
+// True when the autoreload should occur. (A trigger happened and the delay has
+// passed.)
+bool autoreload_ready(void);
+// Reset the autoreload timer in preparation for another trigger. Call when the
+// last trigger starts being executed.
+void autoreload_reset(void);
+// True when a trigger has occurred but we're still delaying in case another
+// trigger occurs.
+bool autoreload_pending(void);
+
+// Temporarily turn autoreload off, for the given reason(s). Autoreload triggers
+// will still be tracked so resuming with autoreload ready with cause an
+// immediate reload.
 // Used during the REPL or during parts of BLE workflow.
 void autoreload_suspend(uint32_t suspend_reason_mask);
 // Allow autoreloads again, for the given reason(s).

supervisor/shared/usb/usb_msc_flash.c

@@ -185,6 +185,7 @@ int32_t tud_msc_read10_cb(uint8_t lun, uint32_t lba, uint32_t offset, void *buff
 int32_t tud_msc_write10_cb(uint8_t lun, uint32_t lba, uint32_t offset, uint8_t *buffer, uint32_t bufsize) {
     (void)lun;
     (void)offset;
+    autoreload_suspend(AUTORELOAD_SUSPEND_USB);
 
     const uint32_t block_count = bufsize / MSC_FLASH_BLOCK_SIZE;
 
@@ -215,7 +216,8 @@ void tud_msc_write10_complete_cb(uint8_t lun) {
     (void)lun;
 
     // This write is complete; initiate an autoreload.
-    autoreload_start();
+    autoreload_trigger();
+    autoreload_resume(AUTORELOAD_SUSPEND_USB);
 }
 
 // Invoked when received SCSI_CMD_INQUIRY