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DS18B20/dwt.c

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+/**
+  ******************************************************************************
+  * @file    dwt.c
+  * @brief   This file includes the utilities for DWT
+  ******************************************************************************
+  */
+#include "dwt.h"
+
+static uint32_t SysCClk, start;
+
+/**
+  * @brief  Initialize DWT
+  */
+void DwtInit(void)
+{
+	SysCClk 		= (SystemCoreClock / 1000000);	// Calculate in us
+	DWT_LAR			|= DWT_LAR_UNLOCK;
+	DEM_CR			|= (uint32_t)DEM_CR_TRCENA;
+	DWT_CYCCNT		= (uint32_t)0u;					// Reset the clock counter
+	DWT_CR			|= (uint32_t)DWT_CR_CYCCNTENA;
+}
+
+/**
+  * @brief  Start DWT Counter
+  */
+void DwtStart(void)
+{
+	start = DWT_CYCCNT;
+}
+
+/**
+  * @brief  Calculate Interval Base On Previous Start Time
+  * @retval Interval in us
+  */
+float DwtInterval(void)
+{
+	return (float)(DWT_CYCCNT - start) / SysCClk;
+}
+
+/**
+  * @brief  Function to delay in microsecond
+  * @param	usec	Period in microsecond
+  */
+inline void DwtDelay_us(uint32_t usec)
+{
+	start = DWT_CYCCNT;
+	while(((DWT_CYCCNT - start) / SysCClk) < usec) {};
+}
+
+/**
+  * @brief  Function to delay in millisecond
+  * @param	msec	Period in millisecond
+  */
+inline void DwtDelay_ms(uint32_t msec)
+{
+	start = DWT_CYCCNT;
+	while(((DWT_CYCCNT - start) / SysCClk) < (msec * 1000)) {};
+}