Diff: targets/TARGET_Maxim/TARGET_MAX32625/mxc/tmr_utils.c

Revision:

150:02e0a0aed4ec

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_Maxim/TARGET_MAX32625/mxc/tmr_utils.c	Tue Nov 08 17:45:16 2016 +0000
@@ -0,0 +1,168 @@
+/*******************************************************************************
+ * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
+ *
+ * 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 MAXIM INTEGRATED 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.
+ *
+ * Except as contained in this notice, the name of Maxim Integrated
+ * Products, Inc. shall not be used except as stated in the Maxim Integrated
+ * Products, Inc. Branding Policy.
+ *
+ * The mere transfer of this software does not imply any licenses
+ * of trade secrets, proprietary technology, copyrights, patents,
+ * trademarks, maskwork rights, or any other form of intellectual
+ * property whatsoever. Maxim Integrated Products, Inc. retains all
+ * ownership rights.
+ *
+ * $Date: 2016-03-11 11:46:37 -0600 (Fri, 11 Mar 2016) $
+ * $Revision: 21839 $
+ *
+ ******************************************************************************/
+
+/**
+ * @file    tmr_utils.c
+ * @brief   Timer utility functions.
+ */
+
+/***** Includes *****/
+#include <stddef.h>
+#include "mxc_assert.h"
+#include "tmr.h"
+#include "tmr_utils.h"
+
+/***** Definitions *****/
+
+/***** Globals *****/
+
+/***** Functions *****/
+
+/******************************************************************************/
+void TMR_Delay(mxc_tmr_regs_t* tmr, unsigned long us)
+{
+    TMR_TO_Start(tmr, us);
+
+    while(TMR_TO_Check(tmr) != E_TIME_OUT) {}
+}
+
+/******************************************************************************/
+void TMR_TO_Start(mxc_tmr_regs_t* tmr, unsigned long us)
+{
+    unsigned clk_shift = 0;
+    uint64_t max_us;
+    uint32_t ticks;
+
+    // Adjust the clk shift amout by how long the timeout is
+    // Start with the fastest clock to give the greatest accuracy
+    do {
+        max_us = (uint64_t)((0xFFFFFFFFUL / ((uint64_t)SystemCoreClock >> clk_shift++)) * 1000000UL);
+    } while(us > max_us);
+
+    // Calculate the number of timer ticks we need to wait
+    TMR_Init(tmr, (tmr_prescale_t)clk_shift, NULL);
+    TMR32_TimeToTicks(tmr, us, TMR_UNIT_MICROSEC, &ticks);
+
+    // Initialize the timer in one-shot mode
+    tmr32_cfg_t cfg;
+    cfg.mode = TMR32_MODE_ONE_SHOT;
+    cfg.compareCount = ticks;
+    TMR32_Stop(tmr);
+    TMR32_Config(tmr, &cfg);
+
+    TMR32_ClearFlag(tmr);
+    TMR32_Start(tmr);
+}
+
+/******************************************************************************/
+int TMR_TO_Check(mxc_tmr_regs_t* tmr)
+{
+    if(TMR32_GetFlag(tmr)) {
+        return E_TIME_OUT;
+    }
+    return E_NO_ERROR;
+}
+
+/******************************************************************************/
+void TMR_TO_Stop(mxc_tmr_regs_t* tmr)
+{
+    TMR32_Stop(tmr);
+    TMR32_SetCount(tmr, 0x0);
+}
+
+/******************************************************************************/
+void TMR_TO_Clear(mxc_tmr_regs_t* tmr)
+{
+    TMR32_ClearFlag(tmr);
+    TMR32_SetCount(tmr, 0x0);
+}
+
+/******************************************************************************/
+unsigned TMR_TO_Elapsed(mxc_tmr_regs_t* tmr)
+{
+    uint32_t elapsed;
+    tmr_unit_t units;
+
+    TMR_TicksToTime(tmr, TMR32_GetCount(tmr), &elapsed, &units);
+
+    switch(units) {
+        case TMR_UNIT_NANOSEC:
+        default:
+            return (elapsed / 1000);
+        case TMR_UNIT_MICROSEC:
+            return (elapsed);
+        case TMR_UNIT_MILLISEC:
+            return (elapsed * 1000);
+        case TMR_UNIT_SEC:
+            return (elapsed * 1000000);
+    }
+}
+
+/******************************************************************************/
+unsigned TMR_TO_Remaining(mxc_tmr_regs_t* tmr)
+{
+    uint32_t remaining_ticks, remaining_time;
+    tmr_unit_t units;
+
+    remaining_ticks = TMR32_GetCompare(tmr) - TMR32_GetCount(tmr);
+    TMR_TicksToTime(tmr, remaining_ticks, &remaining_time, &units);
+
+    switch(units) {
+        case TMR_UNIT_NANOSEC:
+        default:
+            return (remaining_time / 1000);
+        case TMR_UNIT_MICROSEC:
+            return (remaining_time);
+        case TMR_UNIT_MILLISEC:
+            return (remaining_time * 1000);
+        case TMR_UNIT_SEC:
+            return (remaining_time * 1000000);
+    }
+}
+
+/******************************************************************************/
+void TMR_SW_Start(mxc_tmr_regs_t* tmr)
+{
+    TMR_TO_Start(tmr, 0xFFFFFFFF);
+}
+
+/******************************************************************************/
+unsigned TMR_SW_Stop(mxc_tmr_regs_t* tmr)
+{
+    unsigned elapsed = TMR_TO_Elapsed(tmr);
+    TMR_TO_Stop(tmr);
+    return elapsed;
+}