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diff --git a/src/gos/chibios.h b/src/gos/chibios.h
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+/*
+ * This file is subject to the terms of the GFX License. If a copy of
+ * the license was not distributed with this file, you can obtain one at:
+ *
+ * http://ugfx.org/license.html
+ */
+
+/**
+ * @file include/gos/chibios.h
+ * @brief GOS - Operating System Support header file for ChibiOS.
+ */
+
+#ifndef _GOS_CHIBIOS_H
+#define _GOS_CHIBIOS_H
+
+#if GFX_USE_OS_CHIBIOS
+
+#include "ch.h"
+#include "hal.h"
+
+/*===========================================================================*/
+/* Type definitions */
+/*===========================================================================*/
+
+/**
+ * bool_t,
+ * int8_t, uint8_t,
+ * int16_t, uint16_t,
+ * int32_t, uint32_t,
+ * size_t
+ * TRUE, FALSE
+ * TIME_IMMEDIATE, TIME_INFINITE
+ * are already defined by ChibiOS
+ */
+
+typedef systime_t delaytime_t;
+typedef systime_t systemticks_t;
+typedef cnt_t semcount_t;
+typedef msg_t threadreturn_t;
+typedef tprio_t threadpriority_t;
+
+#define MAX_SEMAPHORE_COUNT ((semcount_t)(((unsigned long)((semcount_t)(-1))) >> 1))
+#define LOW_PRIORITY LOWPRIO
+#define NORMAL_PRIORITY NORMALPRIO
+#define HIGH_PRIORITY HIGHPRIO
+
+#define DECLARE_THREAD_STACK(name, sz) WORKING_AREA(name, sz)
+#define DECLARE_THREAD_FUNCTION(fnName, param) threadreturn_t fnName(void *param)
+
+typedef struct {
+ Semaphore sem;
+ semcount_t limit;
+ } gfxSem;
+
+typedef Mutex gfxMutex;
+typedef Thread * gfxThreadHandle;
+
+/*===========================================================================*/
+/* Function declarations. */
+/*===========================================================================*/
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define gfxHalt(msg) { chDbgPanic(msg); chSysHalt(); }
+#define gfxExit() chSysHalt()
+#define gfxAlloc(sz) chHeapAlloc(0, sz)
+#define gfxFree(ptr) chHeapFree(ptr)
+#define gfxYield() chThdYield()
+#define gfxSystemTicks() chTimeNow()
+#define gfxMillisecondsToTicks(ms) MS2ST(ms)
+#define gfxSystemLock() chSysLock()
+#define gfxSystemUnlock() chSysUnlock()
+#define gfxMutexInit(pmutex) chMtxInit(pmutex)
+#define gfxMutexDestroy(pmutex) (void)pmutex
+#define gfxMutexEnter(pmutex) chMtxLock(pmutex)
+#define gfxMutexExit(pmutex) chMtxUnlock()
+void *gfxRealloc(void *ptr, size_t oldsz, size_t newsz);
+void gfxSleepMilliseconds(delaytime_t ms);
+void gfxSleepMicroseconds(delaytime_t ms);
+void gfxSemInit(gfxSem *psem, semcount_t val, semcount_t limit);
+void gfxSemDestroy(gfxSem *psem);
+bool_t gfxSemWait(gfxSem *psem, delaytime_t ms);
+void gfxSemSignal(gfxSem *psem);
+void gfxSemSignalI(gfxSem *psem);
+#define gfxSemCounterI(psem) ((psem)->sem.s_cnt)
+#define gfxSemCounter(psem) ((psem)->sem.s_cnt)
+gfxThreadHandle gfxThreadCreate(void *stackarea, size_t stacksz, threadpriority_t prio, DECLARE_THREAD_FUNCTION((*fn),p), void *param);
+#define gfxThreadWait(thread) chThdWait(thread)
+#define gfxThreadMe() chThdSelf()
+#define gfxThreadClose(thread) (void)thread
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* GFX_USE_OS_CHIBIOS */
+#endif /* _GOS_CHIBIOS_H */
+