init:初始框架

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+/*
+ * Copyright (c) 2020, Texas Instruments Incorporated
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * *  Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * *  Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * *  Neither the name of Texas Instruments Incorporated nor the names of
+ *    its contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+ * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+/*!****************************************************************************
+ *  @file       dl_systick.h
+ *  @brief      System Tick Timer (SysTick) Driver Library
+ *  @defgroup   SYSTICK M0P System Tick Timer (SysTick)
+ *
+ *  @anchor ti_dl_m0p_dl_systick_Overview
+ *  # Overview
+ *
+ *  SysTick is a simple timer that is part of the Cortex-M architecture. Its
+ *  intended purpose is to provide a periodic interrupt for an RTOS, but it can
+ *  be used for other simple timing purposes.
+ *
+ *  <hr>
+ ******************************************************************************
+ */
+/** @addtogroup SYSTICK
+ * @{
+ */
+#ifndef ti_dl_m0p_dl_systick__include
+#define ti_dl_m0p_dl_systick__include
+
+#include <stdbool.h>
+#include <stdint.h>
+
+#include <ti/devices/msp/msp.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* clang-format off */
+
+/**
+ *  @brief Redirects DL_SYSTICK_config to CMSIS standard SysTick_Config
+ */
+#define DL_SYSTICK_config(x)                                   SysTick_Config(x)
+
+/* clang-format on */
+
+/**
+ *  @brief     Initializes the System Tick Timer (SysTick)
+ *
+ *  Initializes the System Tick Timer by configuring the desired period. Resets
+ *  the counter so that, once enabled, the SysTick starts counting from 0. Does
+ *  not start the timer or enable the interrupt.
+ *
+ *  @param[in] period       The period in ticks for the SysTick to fire. Value
+ *                          between 0x00000002 - 0x01000000.
+ */
+__STATIC_INLINE void DL_SYSTICK_init(uint32_t period)
+{
+    SysTick->CTRL = SysTick_CTRL_CLKSOURCE_Msk;
+    SysTick->LOAD = period - (uint32_t) 1;
+    SysTick->VAL  = 0;
+}
+
+/**
+ *  @brief     Set the period for the SysTick
+ *
+ *  Calling this function does not cause the SysTick counter to reload
+ *  immediately. If you want to change the period and reset the counter use
+ *  the @ref DL_SYSTICK_init function or @ref DL_SYSTICK_resetValue.
+ *
+ *  @param[in] period  The period in ticks for the SysTick to fire. Value
+ *                     between 0x00000002 - 0x01000000.
+ */
+__STATIC_INLINE void DL_SYSTICK_setPeriod(uint32_t period)
+{
+    SysTick->LOAD = period - (uint32_t) 1;
+}
+
+/**
+ *  @brief  Reset the current value of the SysTick
+ *
+ *  Resets the current value of the SysTick back to 0, essentially resetting
+ *  the period.
+ */
+__STATIC_INLINE void DL_SYSTICK_resetValue(void)
+{
+    SysTick->VAL = 0;
+}
+
+/**
+ *  @brief   Get the period for the SysTick
+ *
+ *  @return  The period in ticks for the SysTick to fire
+ *
+ *  @retval  Value between 0x00000002 - 0x01000000.
+ */
+__STATIC_INLINE uint32_t DL_SYSTICK_getPeriod(void)
+{
+    return (SysTick->LOAD + (uint32_t) 1);
+}
+
+/**
+ *  @brief   Get the current value of SysTick counter
+ *
+ *  @return  The current value of the counter in ticks
+ *
+ *  @retval  Value between 0x00000000 - 0x00FFFFFF.
+ */
+__STATIC_INLINE uint32_t DL_SYSTICK_getValue(void)
+{
+    return SysTick->VAL;
+}
+
+/**
+ *  @brief  Enable the SysTick interrupt
+ */
+__STATIC_INLINE void DL_SYSTICK_enableInterrupt(void)
+{
+    SysTick->CTRL |= SysTick_CTRL_TICKINT_Msk;
+}
+
+/**
+ *  @brief  Disable the SysTick interrupt
+ */
+__STATIC_INLINE void DL_SYSTICK_disableInterrupt(void)
+{
+    SysTick->CTRL &= ~(SysTick_CTRL_TICKINT_Msk);
+}
+
+/**
+ *  @brief  Enable the SysTick, starts counting once enabled
+ *
+ *  Once enabled, the SysTick will start counting from whatever value it was
+ *  disabled with. To ensure a full period, use @ref DL_SYSTICK_init
+ *  or @ref DL_SYSTICK_resetValue before enabling.
+ */
+__STATIC_INLINE void DL_SYSTICK_enable(void)
+{
+    SysTick->CTRL |= (SysTick_CTRL_CLKSOURCE_Msk | SysTick_CTRL_ENABLE_Msk);
+}
+
+/**
+ *  @brief  Disable the SysTick, stops counting once disabled
+ */
+__STATIC_INLINE void DL_SYSTICK_disable(void)
+{
+    SysTick->CTRL &= ~(SysTick_CTRL_ENABLE_Msk);
+}
+
+/**
+ *  @brief   Checks if the SysTick is enabled
+ *
+ *  @return  Returns the enabled status of the SysTick
+ *
+ *  @retval  true  The SysTick is enabled and counting
+ *  @retval  false The SysTick is disabled and not counting
+ */
+__STATIC_INLINE bool DL_SYSTICK_isEnabled(void)
+{
+    return (
+        (SysTick->CTRL & SysTick_CTRL_ENABLE_Msk) == SysTick_CTRL_ENABLE_Msk);
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ti_dl_m0p_dl_systick__include */
+/** @}*/