1 files changed, 178 insertions, 0 deletions
diff --git a/circuitpython/supervisor/shared/tick.c b/circuitpython/supervisor/shared/tick.c
new file mode 100644
index 0000000..104083f
--- /dev/null
+++ b/circuitpython/supervisor/shared/tick.c
@@ -0,0 +1,178 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Jeff Epler for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "supervisor/shared/tick.h"
+
+#include "shared/runtime/interrupt_char.h"
+#include "py/mphal.h"
+#include "py/mpstate.h"
+#include "py/runtime.h"
+#include "supervisor/linker.h"
+#include "supervisor/filesystem.h"
+#include "supervisor/background_callback.h"
+#include "supervisor/port.h"
+#include "supervisor/shared/stack.h"
+
+#if CIRCUITPY_BLEIO_HCI
+#include "common-hal/_bleio/__init__.h"
+#endif
+
+#if CIRCUITPY_DISPLAYIO
+#include "shared-module/displayio/__init__.h"
+#endif
+
+#if CIRCUITPY_GAMEPADSHIFT
+#include "shared-module/gamepadshift/__init__.h"
+#endif
+
+#if CIRCUITPY_KEYPAD
+#include "shared-module/keypad/__init__.h"
+#endif
+
+#include "shared-bindings/microcontroller/__init__.h"
+
+#if CIRCUITPY_WATCHDOG
+#include "shared-bindings/watchdog/__init__.h"
+#define WATCHDOG_EXCEPTION_CHECK() (MP_STATE_VM(mp_pending_exception) == &mp_watchdog_timeout_exception)
+#else
+#define WATCHDOG_EXCEPTION_CHECK() 0
+#endif
+
+static volatile uint64_t PLACE_IN_DTCM_BSS(background_ticks);
+
+static background_callback_t tick_callback;
+
+static volatile uint64_t last_finished_tick = 0;
+
+static volatile size_t tick_enable_count = 0;
+
+static void supervisor_background_tasks(void *unused) {
+    port_start_background_task();
+
+    assert_heap_ok();
+
+    #if CIRCUITPY_BLEIO_HCI
+    bleio_hci_background();
+    #endif
+
+    #if CIRCUITPY_DISPLAYIO
+    displayio_background();
+    #endif
+
+    filesystem_background();
+
+    port_background_task();
+
+    assert_heap_ok();
+
+    last_finished_tick = port_get_raw_ticks(NULL);
+
+    port_finish_background_task();
+}
+
+bool supervisor_background_tasks_ok(void) {
+    return port_get_raw_ticks(NULL) - last_finished_tick < 1024;
+}
+
+void supervisor_tick(void) {
+    #if CIRCUITPY_FILESYSTEM_FLUSH_INTERVAL_MS > 0
+    filesystem_tick();
+    #endif
+
+    #ifdef CIRCUITPY_GAMEPAD_TICKS
+    if (!(port_get_raw_ticks(NULL) & CIRCUITPY_GAMEPAD_TICKS)) {
+        #if CIRCUITPY_GAMEPADSHIFT
+        gamepadshift_tick();
+        #endif
+    }
+    #endif
+
+    #if CIRCUITPY_KEYPAD
+    keypad_tick();
+    #endif
+
+    background_callback_add(&tick_callback, supervisor_background_tasks, NULL);
+}
+
+uint64_t supervisor_ticks_ms64() {
+    uint64_t result;
+    result = port_get_raw_ticks(NULL);
+    result = result * 1000 / 1024;
+    return result;
+}
+
+uint32_t supervisor_ticks_ms32() {
+    return supervisor_ticks_ms64();
+}
+
+
+void PLACE_IN_ITCM(supervisor_run_background_tasks_if_tick)() {
+    background_callback_run_all();
+}
+
+void mp_hal_delay_ms(mp_uint_t delay_ms) {
+    uint64_t start_tick = port_get_raw_ticks(NULL);
+    // Adjust the delay to ticks vs ms.
+    uint64_t delay_ticks = (delay_ms * (uint64_t)1024) / 1000;
+    uint64_t end_tick = start_tick + delay_ticks;
+    int64_t remaining = delay_ticks;
+
+    // Loop until we've waited long enough or we've been CTRL-Ced by autoreload
+    // or the user.
+    while (remaining > 0 && !mp_hal_is_interrupted()) {
+        RUN_BACKGROUND_TASKS;
+        remaining = end_tick - port_get_raw_ticks(NULL);
+        // We break a bit early so we don't risk setting the alarm before the time when we call
+        // sleep.
+        if (remaining < 1) {
+            break;
+        }
+        port_interrupt_after_ticks(remaining);
+        // Idle until an interrupt happens.
+        port_idle_until_interrupt();
+        remaining = end_tick - port_get_raw_ticks(NULL);
+    }
+}
+
+void supervisor_enable_tick(void) {
+    common_hal_mcu_disable_interrupts();
+    if (tick_enable_count == 0) {
+        port_enable_tick();
+    }
+    tick_enable_count++;
+    common_hal_mcu_enable_interrupts();
+}
+
+void supervisor_disable_tick(void) {
+    common_hal_mcu_disable_interrupts();
+    if (tick_enable_count > 0) {
+        tick_enable_count--;
+    }
+    if (tick_enable_count == 0) {
+        port_disable_tick();
+    }
+    common_hal_mcu_enable_interrupts();
+}