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

Revision:

150:02e0a0aed4ec

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_Maxim/TARGET_MAX32625/mxc/tmr.c	Tue Nov 08 17:45:16 2016 +0000
@@ -0,0 +1,389 @@
+/*******************************************************************************
+ * 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 $
+ *
+ ******************************************************************************/
+
+#include <stddef.h>
+#include "mxc_assert.h"
+#include "tmr.h"
+
+static tmr_prescale_t prescaler[MXC_CFG_TMR_INSTANCES];
+
+/******************************************************************************/
+int TMR_Init(mxc_tmr_regs_t *tmr, tmr_prescale_t prescale, const sys_cfg_tmr_t *sysCfg)
+{
+    int err;
+    int tmrNum;
+
+    //get the timer number
+    tmrNum = MXC_TMR_GET_IDX(tmr);
+
+    //check for valid pointer
+    MXC_ASSERT(tmrNum >= 0);
+
+    //steup system GPIO config
+    if((err = SYS_TMR_Init(tmr, sysCfg)) != E_NO_ERROR)
+        return err;
+
+    //save the prescale value for this timer
+    prescaler[tmrNum] = prescale;
+
+    //Disable timer and clear settings
+    tmr->ctrl = 0;
+
+    //reset all counts to 0
+    tmr->count32 = 0;
+    tmr->count16_0 = 0;
+    tmr->count16_1 = 0;
+
+    // Clear interrupt flag
+    tmr->intfl = MXC_F_TMR_INTFL_TIMER0 | MXC_F_TMR_INTFL_TIMER1;
+
+    return E_NO_ERROR;
+}
+
+/******************************************************************************/
+void TMR32_Config(mxc_tmr_regs_t *tmr, const tmr32_cfg_t *config)
+{
+    //stop timer
+    TMR32_Stop(tmr);
+
+    //setup timer configuration register
+    //clear tmr2x16 (32bit mode), mode and polarity bits
+    tmr->ctrl &= ~(MXC_F_TMR_CTRL_TMR2X16 | MXC_F_TMR_CTRL_MODE |
+                   MXC_F_TMR_CTRL_POLARITY);
+
+    //set mode and polarity
+    tmr->ctrl |= ((config->mode << MXC_F_TMR_CTRL_MODE_POS) |
+                  (config->polarity << MXC_F_TMR_CTRL_POLARITY_POS));
+
+    //setup timer Tick registers
+    tmr->term_cnt32 = config->compareCount;
+
+    return;
+}
+
+/******************************************************************************/
+void TMR32_PWMConfig(mxc_tmr_regs_t *tmr, const tmr32_cfg_pwm_t *config)
+{
+    //stop timer
+    TMR32_Stop(tmr);
+
+    //setup timer configuration register
+    //clear tmr2x16 (32bit mode), mode and polarity bits
+    tmr->ctrl &= ~(MXC_F_TMR_CTRL_TMR2X16 | MXC_F_TMR_CTRL_MODE |
+                   MXC_F_TMR_CTRL_POLARITY);
+
+    //set mode and polarity
+    tmr->ctrl |= ((TMR32_MODE_PWM << MXC_F_TMR_CTRL_MODE_POS) |
+                  (config->polarity << MXC_F_TMR_CTRL_POLARITY_POS));
+
+    tmr->pwm_cap32 = config->dutyCount;
+
+    //setup timer Tick registers
+    tmr->count32 = 0;
+    tmr->term_cnt32 = config->periodCount;
+
+    return;
+}
+
+/******************************************************************************/
+void TMR16_Config(mxc_tmr_regs_t *tmr, uint8_t index, const tmr16_cfg_t *config)
+{
+    //stop timer
+    TMR16_Stop(tmr, index);
+
+    if(index > 0) { //configure timer 16_1
+
+        //setup timer configuration register
+        tmr->ctrl |= MXC_F_TMR_CTRL_TMR2X16;   //1 = 16bit mode
+
+        //set mode
+        if(config->mode)
+            tmr->ctrl |= MXC_F_TMR_CTRL_MODE_16_1;
+        else
+            tmr->ctrl &= ~MXC_F_TMR_CTRL_MODE_16_1;
+
+        //setup timer Ticks registers
+        tmr->term_cnt16_1 = config->compareCount;
+    } else { //configure timer 16_0
+
+        //setup timer configuration register
+        tmr->ctrl |= MXC_F_TMR_CTRL_TMR2X16;    //1 = 16bit mode
+
+        //set mode
+        if(config->mode)
+            tmr->ctrl |= MXC_F_TMR_CTRL_MODE_16_0;
+        else
+            tmr->ctrl &= ~MXC_F_TMR_CTRL_MODE_16_0;
+
+        //setup timer Ticks registers
+        tmr->term_cnt16_0 = config->compareCount;
+    }
+
+    return;
+}
+
+/******************************************************************************/
+void TMR32_Start(mxc_tmr_regs_t *tmr)
+{
+    int tmrNum;
+    uint32_t ctrl;
+
+    //get the timer number
+    tmrNum = MXC_TMR_GET_IDX(tmr);
+
+    //prescaler gets reset to 0 when timer is disabled
+    //set the prescale to the saved value for this timer
+    ctrl = tmr->ctrl;
+    ctrl &= ~(MXC_F_TMR_CTRL_PRESCALE); //clear prescaler bits
+    ctrl |= prescaler[tmrNum] << MXC_F_TMR_CTRL_PRESCALE_POS;        //set prescaler
+    ctrl |= MXC_F_TMR_CTRL_ENABLE0;     //set enable to start the timer
+
+    tmr->ctrl = ctrl;
+
+    return;
+}
+
+/******************************************************************************/
+void TMR16_Start(mxc_tmr_regs_t *tmr, uint8_t index)
+{
+    int tmrNum;
+    uint32_t ctrl;
+
+    //get the timer number
+    tmrNum = MXC_TMR_GET_IDX(tmr);
+
+    ctrl = tmr->ctrl;
+
+    //prescaler gets reset to 0 when both 16 bit timers are disabled
+    //set the prescale to the saved value for this timer if is is not already set
+    if((ctrl & MXC_F_TMR_CTRL_PRESCALE) != ((uint32_t)prescaler[tmrNum] << MXC_F_TMR_CTRL_PRESCALE_POS)) {
+        ctrl &= ~(MXC_F_TMR_CTRL_PRESCALE); //clear prescaler bits
+        ctrl |= prescaler[tmrNum] << MXC_F_TMR_CTRL_PRESCALE_POS;   //set prescaler
+    }
+
+    if(index > 0)
+        ctrl |= MXC_F_TMR_CTRL_ENABLE1; //start timer 16_1
+    else
+        ctrl |= MXC_F_TMR_CTRL_ENABLE0; //start timer 16_0
+
+    tmr->ctrl = ctrl;
+
+    return;
+}
+
+/******************************************************************************/
+uint32_t TMR_GetPrescaler(mxc_tmr_regs_t *tmr)
+{
+    int tmrNum;
+
+    //get the timer number
+    tmrNum = MXC_TMR_GET_IDX(tmr);
+
+    return ((uint32_t)prescaler[tmrNum]);
+}
+
+
+/******************************************************************************/
+int TMR32_GetPWMTicks(mxc_tmr_regs_t *tmr, uint8_t dutyPercent, uint32_t freq, uint32_t *dutyTicks, uint32_t *periodTicks)
+{
+    uint32_t timerClock;
+    uint32_t prescale;
+    uint64_t ticks;
+
+    if(dutyPercent > 100)
+        return E_BAD_PARAM;
+
+    if(freq == 0)
+        return E_BAD_PARAM;
+
+    timerClock = SYS_TMR_GetFreq(tmr);
+    prescale = TMR_GetPrescaler(tmr);
+
+    if(timerClock == 0 || prescale > TMR_PRESCALE_DIV_2_12)
+        return E_UNINITIALIZED;
+
+    ticks = timerClock / (1 << (prescale & 0xF)) / freq;
+
+    //make sure ticks is within a 32 bit value
+    if (!(ticks & 0xffffffff00000000)  && (ticks & 0xffffffff)) {
+        *periodTicks = ticks;
+
+        *dutyTicks = ((uint64_t)*periodTicks * dutyPercent) / 100;
+
+        return E_NO_ERROR;
+    }
+
+    return E_INVALID;
+}
+
+/******************************************************************************/
+int TMR32_TimeToTicks(mxc_tmr_regs_t *tmr, uint32_t time, tmr_unit_t units, uint32_t *ticks)
+{
+    uint32_t unit_div0, unit_div1;
+    uint32_t timerClock;
+    uint32_t prescale;
+    uint64_t temp_ticks;
+
+    timerClock = SYS_TMR_GetFreq(tmr);
+    prescale = TMR_GetPrescaler(tmr);
+
+    if(timerClock == 0 || prescale > TMR_PRESCALE_DIV_2_12)
+        return E_UNINITIALIZED;
+
+    switch (units) {
+        case TMR_UNIT_NANOSEC:
+            unit_div0 = 1000000;
+            unit_div1 = 1000;
+            break;
+        case TMR_UNIT_MICROSEC:
+            unit_div0 = 1000;
+            unit_div1 = 1000;
+            break;
+        case TMR_UNIT_MILLISEC:
+            unit_div0 = 1;
+            unit_div1 = 1000;
+            break;
+        case TMR_UNIT_SEC:
+            unit_div0 = 1;
+            unit_div1 = 1;
+            break;
+        default:
+            return E_BAD_PARAM;
+    }
+
+    temp_ticks = (uint64_t)time * (timerClock / unit_div0) / (unit_div1 * (1 << (prescale & 0xF)));
+
+    //make sure ticks is within a 32 bit value
+    if (!(temp_ticks & 0xffffffff00000000)  && (temp_ticks & 0xffffffff)) {
+        *ticks = temp_ticks;
+        return E_NO_ERROR;
+    }
+
+    return E_INVALID;
+}
+
+/******************************************************************************/
+int TMR16_TimeToTicks(mxc_tmr_regs_t *tmr, uint32_t time, tmr_unit_t units, uint16_t *ticks)
+{
+    uint32_t unit_div0, unit_div1;
+    uint32_t timerClock;
+    uint32_t prescale;
+    uint64_t temp_ticks;
+
+    timerClock = SYS_TMR_GetFreq(tmr);
+    prescale = TMR_GetPrescaler(tmr);
+
+    if(timerClock == 0 || prescale > TMR_PRESCALE_DIV_2_12)
+        return E_UNINITIALIZED;
+
+    switch (units) {
+        case TMR_UNIT_NANOSEC:
+            unit_div0 = 1000000;
+            unit_div1 = 1000;
+            break;
+        case TMR_UNIT_MICROSEC:
+            unit_div0 = 1000;
+            unit_div1 = 1000;
+            break;
+        case TMR_UNIT_MILLISEC:
+            unit_div0 = 1;
+            unit_div1 = 1000;
+            break;
+        case TMR_UNIT_SEC:
+            unit_div0 = 1;
+            unit_div1 = 1;
+            break;
+        default:
+            return E_BAD_PARAM;
+    }
+
+    temp_ticks = (uint64_t)time * (timerClock / unit_div0) / (unit_div1 * (1 << (prescale & 0xF)));
+
+    //make sure ticks is within a 32 bit value
+    if (!(temp_ticks & 0xffffffffffff0000) && (temp_ticks & 0xffff)) {
+        *ticks = temp_ticks;
+        return E_NO_ERROR;
+    }
+
+    return E_INVALID;
+}
+
+
+/******************************************************************************/
+int TMR_TicksToTime(mxc_tmr_regs_t *tmr, uint32_t ticks, uint32_t *time, tmr_unit_t *units)
+{
+    uint64_t temp_time = 0;
+
+    uint32_t timerClock = SYS_TMR_GetFreq(tmr);
+    uint32_t prescale = TMR_GetPrescaler(tmr);
+
+    if(timerClock == 0 || prescale > TMR_PRESCALE_DIV_2_12)
+        return E_UNINITIALIZED;
+
+    tmr_unit_t temp_unit = TMR_UNIT_NANOSEC;
+    temp_time = (uint64_t)ticks * 1000 * (1 << (prescale & 0xF)) / (timerClock / 1000000);
+    if (!(temp_time & 0xffffffff00000000)) {
+        *time = temp_time;
+        *units = temp_unit;
+        return E_NO_ERROR;
+    }
+
+    temp_unit = TMR_UNIT_MICROSEC;
+    temp_time = (uint64_t)ticks * 1000 * (1 << (prescale & 0xF)) / (timerClock / 1000);
+    if (!(temp_time & 0xffffffff00000000)) {
+        *time = temp_time;
+        *units = temp_unit;
+        return E_NO_ERROR;
+    }
+
+    temp_unit = TMR_UNIT_MILLISEC;
+    temp_time = (uint64_t)ticks * 1000 * (1 << (prescale & 0xF)) / timerClock;
+    if (!(temp_time & 0xffffffff00000000)) {
+        *time = temp_time;
+        *units = temp_unit;
+        return E_NO_ERROR;
+    }
+
+    temp_unit = TMR_UNIT_SEC;
+    temp_time = (uint64_t)ticks * (1 << (prescale & 0xF)) / timerClock;
+    if (!(temp_time & 0xffffffff00000000)) {
+        *time = temp_time;
+        *units = temp_unit;
+        return E_NO_ERROR;
+    }
+
+    return E_INVALID;
+}