1 files changed, 66 insertions, 0 deletions
diff --git a/shared/runtime/softtimer.h b/shared/runtime/softtimer.h
new file mode 100644
index 000000000..8603ea13f
--- /dev/null
+++ b/shared/runtime/softtimer.h
@@ -0,0 +1,66 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Damien P. George
+ *
+ * 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.
+ */
+#ifndef MICROPY_INCLUDED_SHARED_RUNTIME_SOFTTIMER_H
+#define MICROPY_INCLUDED_SHARED_RUNTIME_SOFTTIMER_H
+
+#include "py/pairheap.h"
+
+#define SOFT_TIMER_FLAG_PY_CALLBACK (1)
+#define SOFT_TIMER_FLAG_GC_ALLOCATED (2)
+
+#define SOFT_TIMER_MODE_ONE_SHOT (1)
+#define SOFT_TIMER_MODE_PERIODIC (2)
+
+typedef struct _soft_timer_entry_t {
+    mp_pairheap_t pairheap;
+    uint16_t flags;
+    uint16_t mode;
+    uint32_t expiry_ms;
+    uint32_t delta_ms; // for periodic mode
+    union {
+        void (*c_callback)(struct _soft_timer_entry_t *);
+        mp_obj_t py_callback;
+    };
+} soft_timer_entry_t;
+
+extern volatile uint32_t soft_timer_next;
+
+void soft_timer_deinit(void);
+void soft_timer_handler(void);
+void soft_timer_gc_mark_all(void);
+
+void soft_timer_static_init(soft_timer_entry_t *entry, uint16_t mode, uint32_t delta_ms, void (*cb)(soft_timer_entry_t *));
+void soft_timer_insert(soft_timer_entry_t *entry, uint32_t initial_delta_ms);
+void soft_timer_remove(soft_timer_entry_t *entry);
+
+// The timer will be reinserted into the heap so that it is called after initial_delta_ms milliseconds.
+// After that, if it's periodic, it will continue to be called every entry->delta_ms milliseconds.
+static inline void soft_timer_reinsert(soft_timer_entry_t *entry, uint32_t initial_delta_ms) {
+    soft_timer_remove(entry);
+    soft_timer_insert(entry, initial_delta_ms);
+}
+
+#endif // MICROPY_INCLUDED_SHARED_RUNTIME_SOFTTIMER_H