Vipin Ranka / MGAS_GR_Peach

This is the final version of Mini Gateway for Automation and Security desgined for Renesas GR Peach Design Contest

Dependencies:   GR-PEACH_video GraphicsFramework HTTPServer R_BSP mbed-rpc mbed-rtos Socket lwip-eth lwip-sys lwip FATFileSystem

Fork of mbed-os-example-mbed5-blinky by mbed-os-examples

mbed-dev/targets/TARGET_Maxim/TARGET_MAX32620/us_ticker.c@12:9a20164dcc47, 2017-01-11 (annotated)

Committer:
vipinranka
Date:
Wed Jan 11 11:41:30 2017 +0000
Revision:
12:9a20164dcc47
This is the final version MGAS Project for Renesas GR Peach Design Contest

Who changed what in which revision?

UserRevisionLine numberNew contents of line
vipinranka 12:9a20164dcc47 1 /*******************************************************************************
vipinranka 12:9a20164dcc47 2 * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
vipinranka 12:9a20164dcc47 3 *
vipinranka 12:9a20164dcc47 4 * Permission is hereby granted, free of charge, to any person obtaining a
vipinranka 12:9a20164dcc47 5 * copy of this software and associated documentation files (the "Software"),
vipinranka 12:9a20164dcc47 6 * to deal in the Software without restriction, including without limitation
vipinranka 12:9a20164dcc47 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
vipinranka 12:9a20164dcc47 8 * and/or sell copies of the Software, and to permit persons to whom the
vipinranka 12:9a20164dcc47 9 * Software is furnished to do so, subject to the following conditions:
vipinranka 12:9a20164dcc47 10 *
vipinranka 12:9a20164dcc47 11 * The above copyright notice and this permission notice shall be included
vipinranka 12:9a20164dcc47 12 * in all copies or substantial portions of the Software.
vipinranka 12:9a20164dcc47 13 *
vipinranka 12:9a20164dcc47 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
vipinranka 12:9a20164dcc47 15 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
vipinranka 12:9a20164dcc47 16 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
vipinranka 12:9a20164dcc47 17 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
vipinranka 12:9a20164dcc47 18 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
vipinranka 12:9a20164dcc47 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
vipinranka 12:9a20164dcc47 20 * OTHER DEALINGS IN THE SOFTWARE.
vipinranka 12:9a20164dcc47 21 *
vipinranka 12:9a20164dcc47 22 * Except as contained in this notice, the name of Maxim Integrated
vipinranka 12:9a20164dcc47 23 * Products, Inc. shall not be used except as stated in the Maxim Integrated
vipinranka 12:9a20164dcc47 24 * Products, Inc. Branding Policy.
vipinranka 12:9a20164dcc47 25 *
vipinranka 12:9a20164dcc47 26 * The mere transfer of this software does not imply any licenses
vipinranka 12:9a20164dcc47 27 * of trade secrets, proprietary technology, copyrights, patents,
vipinranka 12:9a20164dcc47 28 * trademarks, maskwork rights, or any other form of intellectual
vipinranka 12:9a20164dcc47 29 * property whatsoever. Maxim Integrated Products, Inc. retains all
vipinranka 12:9a20164dcc47 30 * ownership rights.
vipinranka 12:9a20164dcc47 31 *******************************************************************************
vipinranka 12:9a20164dcc47 32 */
vipinranka 12:9a20164dcc47 33
vipinranka 12:9a20164dcc47 34 #include "mbed_error.h"
vipinranka 12:9a20164dcc47 35 #include "us_ticker_api.h"
vipinranka 12:9a20164dcc47 36 #include "PeripheralNames.h"
vipinranka 12:9a20164dcc47 37 #include "tmr_regs.h"
vipinranka 12:9a20164dcc47 38 #include "clkman_regs.h"
vipinranka 12:9a20164dcc47 39
vipinranka 12:9a20164dcc47 40 #define US_TIMER MXC_TMR0
vipinranka 12:9a20164dcc47 41 #define US_TIMER_IRQn TMR0_0_IRQn
vipinranka 12:9a20164dcc47 42
vipinranka 12:9a20164dcc47 43 /**
vipinranka 12:9a20164dcc47 44 * Defines timer modes for 16 and 32-bit timers
vipinranka 12:9a20164dcc47 45 */
vipinranka 12:9a20164dcc47 46 typedef enum {
vipinranka 12:9a20164dcc47 47 /** 32-bit or 16-bit timer one-shot mode */
vipinranka 12:9a20164dcc47 48 MXC_E_TMR_MODE_ONE_SHOT = 0,
vipinranka 12:9a20164dcc47 49 /** 32-bit or 16-bit timer one-shot mode */
vipinranka 12:9a20164dcc47 50 MXC_E_TMR_MODE_CONTINUOUS,
vipinranka 12:9a20164dcc47 51 /** 32-bit timer counter mode */
vipinranka 12:9a20164dcc47 52 MXC_E_TMR_MODE_COUNTER,
vipinranka 12:9a20164dcc47 53 /** 32-bit timer pulse width modulation mode */
vipinranka 12:9a20164dcc47 54 MXC_E_TMR_MODE_PWM,
vipinranka 12:9a20164dcc47 55 /** 32-bit timer capture mode */
vipinranka 12:9a20164dcc47 56 MXC_E_TMR_MODE_CAPTURE,
vipinranka 12:9a20164dcc47 57 /** 32-bit timer compare mode */
vipinranka 12:9a20164dcc47 58 MXC_E_TMR_MODE_COMPARE,
vipinranka 12:9a20164dcc47 59 /** 32-bit timer gated mode */
vipinranka 12:9a20164dcc47 60 MXC_E_TMR_MODE_GATED,
vipinranka 12:9a20164dcc47 61 /** 32-bit timer measure mode */
vipinranka 12:9a20164dcc47 62 MXC_E_TMR_MODE_MEASURE
vipinranka 12:9a20164dcc47 63 } mxc_tmr_mode_t;
vipinranka 12:9a20164dcc47 64
vipinranka 12:9a20164dcc47 65 static int us_ticker_inited = 0;
vipinranka 12:9a20164dcc47 66 static uint32_t ticks_per_us;
vipinranka 12:9a20164dcc47 67 static uint32_t tick_win;
vipinranka 12:9a20164dcc47 68 static volatile uint64_t current_cnt; // Hold the current ticks
vipinranka 12:9a20164dcc47 69 static volatile uint64_t event_cnt; // Holds the value of the next event
vipinranka 12:9a20164dcc47 70
vipinranka 12:9a20164dcc47 71 #define ticks_to_us(ticks) ((ticks) / ticks_per_us);
vipinranka 12:9a20164dcc47 72 #define MAX_TICK_VAL ((uint64_t)0xFFFFFFFF * ticks_per_us)
vipinranka 12:9a20164dcc47 73
vipinranka 12:9a20164dcc47 74 //******************************************************************************
vipinranka 12:9a20164dcc47 75 static inline void inc_current_cnt(uint32_t inc)
vipinranka 12:9a20164dcc47 76 {
vipinranka 12:9a20164dcc47 77
vipinranka 12:9a20164dcc47 78 // Overflow the ticker when the us ticker overflows
vipinranka 12:9a20164dcc47 79 current_cnt += inc;
vipinranka 12:9a20164dcc47 80 if (current_cnt > MAX_TICK_VAL) {
vipinranka 12:9a20164dcc47 81 current_cnt -= (MAX_TICK_VAL + 1);
vipinranka 12:9a20164dcc47 82 }
vipinranka 12:9a20164dcc47 83 }
vipinranka 12:9a20164dcc47 84
vipinranka 12:9a20164dcc47 85 //******************************************************************************
vipinranka 12:9a20164dcc47 86 static inline int event_passed(uint64_t current, uint64_t event)
vipinranka 12:9a20164dcc47 87 {
vipinranka 12:9a20164dcc47 88
vipinranka 12:9a20164dcc47 89 // Determine if the event has already happened.
vipinranka 12:9a20164dcc47 90 // If the event is behind the current ticker, within a window,
vipinranka 12:9a20164dcc47 91 // then the event has already happened.
vipinranka 12:9a20164dcc47 92 if (((current < tick_win) && ((event < current) ||
vipinranka 12:9a20164dcc47 93 (event > (MAX_TICK_VAL - (tick_win - current))))) ||
vipinranka 12:9a20164dcc47 94 ((event < current) && (event > (current - tick_win)))) {
vipinranka 12:9a20164dcc47 95 return 1;
vipinranka 12:9a20164dcc47 96 }
vipinranka 12:9a20164dcc47 97
vipinranka 12:9a20164dcc47 98 return 0;
vipinranka 12:9a20164dcc47 99 }
vipinranka 12:9a20164dcc47 100
vipinranka 12:9a20164dcc47 101 //******************************************************************************
vipinranka 12:9a20164dcc47 102 static inline uint64_t event_diff(uint64_t current, uint64_t event)
vipinranka 12:9a20164dcc47 103 {
vipinranka 12:9a20164dcc47 104
vipinranka 12:9a20164dcc47 105 // Check to see if the ticker will overflow before the event
vipinranka 12:9a20164dcc47 106 if(current <= event) {
vipinranka 12:9a20164dcc47 107 return (event - current);
vipinranka 12:9a20164dcc47 108 }
vipinranka 12:9a20164dcc47 109
vipinranka 12:9a20164dcc47 110 return ((MAX_TICK_VAL - current) + event);
vipinranka 12:9a20164dcc47 111 }
vipinranka 12:9a20164dcc47 112
vipinranka 12:9a20164dcc47 113 //******************************************************************************
vipinranka 12:9a20164dcc47 114 static void tmr_handler(void)
vipinranka 12:9a20164dcc47 115 {
vipinranka 12:9a20164dcc47 116 uint32_t term_cnt32 = US_TIMER->term_cnt32;
vipinranka 12:9a20164dcc47 117 US_TIMER->term_cnt32 = 0xFFFFFFFF; // reset to max value to prevent further interrupts
vipinranka 12:9a20164dcc47 118 US_TIMER->intfl = (MXC_F_TMR_INTFL_TIMER0 | MXC_F_TMR_INTFL_TIMER1); // clear interrupt
vipinranka 12:9a20164dcc47 119 NVIC_ClearPendingIRQ(US_TIMER_IRQn);
vipinranka 12:9a20164dcc47 120
vipinranka 12:9a20164dcc47 121 inc_current_cnt(term_cnt32);
vipinranka 12:9a20164dcc47 122
vipinranka 12:9a20164dcc47 123 if (event_passed(current_cnt + US_TIMER->count32, event_cnt )) {
vipinranka 12:9a20164dcc47 124 // the timestamp has expired
vipinranka 12:9a20164dcc47 125 event_cnt = 0xFFFFFFFFFFFFFFFFULL; // reset to max value
vipinranka 12:9a20164dcc47 126 us_ticker_irq_handler();
vipinranka 12:9a20164dcc47 127 } else {
vipinranka 12:9a20164dcc47 128
vipinranka 12:9a20164dcc47 129 uint64_t diff = event_diff(current_cnt, event_cnt);
vipinranka 12:9a20164dcc47 130 if (diff < (uint64_t)0xFFFFFFFF) {
vipinranka 12:9a20164dcc47 131 // the event occurs before the next overflow
vipinranka 12:9a20164dcc47 132 US_TIMER->term_cnt32 = diff;
vipinranka 12:9a20164dcc47 133
vipinranka 12:9a20164dcc47 134 // Since the timer keeps counting after the terminal value is reached, it is possible that the new
vipinranka 12:9a20164dcc47 135 // terminal value is in the past.
vipinranka 12:9a20164dcc47 136 if (US_TIMER->term_cnt32 < US_TIMER->count32) {
vipinranka 12:9a20164dcc47 137 // the timestamp has expired
vipinranka 12:9a20164dcc47 138 US_TIMER->term_cnt32 = 0xFFFFFFFF; // reset to max value to prevent further interrupts
vipinranka 12:9a20164dcc47 139 US_TIMER->intfl = (MXC_F_TMR_INTFL_TIMER0 | MXC_F_TMR_INTFL_TIMER1); // clear interrupt
vipinranka 12:9a20164dcc47 140 NVIC_ClearPendingIRQ(US_TIMER_IRQn);
vipinranka 12:9a20164dcc47 141 event_cnt = 0xFFFFFFFFFFFFFFFFULL; // reset to max value
vipinranka 12:9a20164dcc47 142 us_ticker_irq_handler();
vipinranka 12:9a20164dcc47 143 }
vipinranka 12:9a20164dcc47 144 }
vipinranka 12:9a20164dcc47 145 }
vipinranka 12:9a20164dcc47 146 }
vipinranka 12:9a20164dcc47 147
vipinranka 12:9a20164dcc47 148 //******************************************************************************
vipinranka 12:9a20164dcc47 149 void us_ticker_init(void)
vipinranka 12:9a20164dcc47 150 {
vipinranka 12:9a20164dcc47 151 if (us_ticker_inited)
vipinranka 12:9a20164dcc47 152 return;
vipinranka 12:9a20164dcc47 153 us_ticker_inited = 1;
vipinranka 12:9a20164dcc47 154
vipinranka 12:9a20164dcc47 155 /* Ensure that the TIMER0 clock is enabled */
vipinranka 12:9a20164dcc47 156 if (!(MXC_CLKMAN->clk_gate_ctrl1 & MXC_F_CLKMAN_CLK_GATE_CTRL1_TIMER0_CLK_GATER)) {
vipinranka 12:9a20164dcc47 157 MXC_CLKMAN->clk_gate_ctrl1 |= (2 << MXC_F_CLKMAN_CLK_GATE_CTRL1_TIMER0_CLK_GATER_POS);
vipinranka 12:9a20164dcc47 158 }
vipinranka 12:9a20164dcc47 159
vipinranka 12:9a20164dcc47 160 current_cnt = 0;
vipinranka 12:9a20164dcc47 161 event_cnt = 0xFFFFFFFFFFFFFFFFULL; // reset to max value
vipinranka 12:9a20164dcc47 162
vipinranka 12:9a20164dcc47 163 if (SystemCoreClock <= 1000000) {
vipinranka 12:9a20164dcc47 164 error("us_ticker cannot operate at this SystemCoreClock");
vipinranka 12:9a20164dcc47 165 return;
vipinranka 12:9a20164dcc47 166 }
vipinranka 12:9a20164dcc47 167
vipinranka 12:9a20164dcc47 168 // Configure timer for 32-bit continuous mode with /1 prescaler
vipinranka 12:9a20164dcc47 169 US_TIMER->ctrl = MXC_E_TMR_MODE_CONTINUOUS << MXC_F_TMR_CTRL_MODE_POS | (0 << MXC_F_TMR_CTRL_PRESCALE_POS);
vipinranka 12:9a20164dcc47 170 ticks_per_us = SystemCoreClock / 1000000;
vipinranka 12:9a20164dcc47 171
vipinranka 12:9a20164dcc47 172 // Set the tick window to 10ms
vipinranka 12:9a20164dcc47 173 tick_win = SystemCoreClock/100;
vipinranka 12:9a20164dcc47 174
vipinranka 12:9a20164dcc47 175 // Set timer overflow to the max
vipinranka 12:9a20164dcc47 176 US_TIMER->term_cnt32 = 0xFFFFFFFF;
vipinranka 12:9a20164dcc47 177 US_TIMER->pwm_cap32 = 0xFFFFFFFF;
vipinranka 12:9a20164dcc47 178 US_TIMER->count32 = 0;
vipinranka 12:9a20164dcc47 179
vipinranka 12:9a20164dcc47 180 US_TIMER->intfl = (MXC_F_TMR_INTFL_TIMER0 | MXC_F_TMR_INTFL_TIMER1); // clear pending interrupts
vipinranka 12:9a20164dcc47 181
vipinranka 12:9a20164dcc47 182 NVIC_SetVector(US_TIMER_IRQn, (uint32_t)tmr_handler);
vipinranka 12:9a20164dcc47 183 NVIC_EnableIRQ(US_TIMER_IRQn);
vipinranka 12:9a20164dcc47 184
vipinranka 12:9a20164dcc47 185 US_TIMER->inten |= MXC_F_TMR_INTEN_TIMER0; // enable interrupts
vipinranka 12:9a20164dcc47 186 US_TIMER->ctrl |= MXC_F_TMR_CTRL_ENABLE0; // enable timer
vipinranka 12:9a20164dcc47 187 }
vipinranka 12:9a20164dcc47 188
vipinranka 12:9a20164dcc47 189 //******************************************************************************
vipinranka 12:9a20164dcc47 190 void us_ticker_deinit(void)
vipinranka 12:9a20164dcc47 191 {
vipinranka 12:9a20164dcc47 192 US_TIMER->ctrl = 0; // disable timer
vipinranka 12:9a20164dcc47 193 US_TIMER->inten = 0; // disable interrupts
vipinranka 12:9a20164dcc47 194 US_TIMER->intfl = (MXC_F_TMR_INTFL_TIMER0 | MXC_F_TMR_INTFL_TIMER1); // clear interrupts
vipinranka 12:9a20164dcc47 195 us_ticker_inited = 0;
vipinranka 12:9a20164dcc47 196 }
vipinranka 12:9a20164dcc47 197
vipinranka 12:9a20164dcc47 198 //******************************************************************************
vipinranka 12:9a20164dcc47 199 uint32_t us_ticker_read(void)
vipinranka 12:9a20164dcc47 200 {
vipinranka 12:9a20164dcc47 201 uint64_t current_cnt1, current_cnt2;
vipinranka 12:9a20164dcc47 202 uint32_t term_cnt, tmr_cnt;
vipinranka 12:9a20164dcc47 203 uint32_t intfl1, intfl2;
vipinranka 12:9a20164dcc47 204
vipinranka 12:9a20164dcc47 205 if (!us_ticker_inited)
vipinranka 12:9a20164dcc47 206 us_ticker_init();
vipinranka 12:9a20164dcc47 207
vipinranka 12:9a20164dcc47 208 // Ensure coherency between current_cnt and US_TIMER->count32
vipinranka 12:9a20164dcc47 209 do {
vipinranka 12:9a20164dcc47 210 current_cnt1 = current_cnt;
vipinranka 12:9a20164dcc47 211 intfl1 = US_TIMER->intfl;
vipinranka 12:9a20164dcc47 212 term_cnt = US_TIMER->term_cnt32;
vipinranka 12:9a20164dcc47 213 tmr_cnt = US_TIMER->count32;
vipinranka 12:9a20164dcc47 214 intfl2 = US_TIMER->intfl;
vipinranka 12:9a20164dcc47 215 current_cnt2 = current_cnt;
vipinranka 12:9a20164dcc47 216 } while ((current_cnt1 != current_cnt2) || (intfl1 != intfl2));
vipinranka 12:9a20164dcc47 217
vipinranka 12:9a20164dcc47 218 // Account for an unserviced interrupt
vipinranka 12:9a20164dcc47 219 if (intfl1) {
vipinranka 12:9a20164dcc47 220 current_cnt1 += term_cnt;
vipinranka 12:9a20164dcc47 221 }
vipinranka 12:9a20164dcc47 222
vipinranka 12:9a20164dcc47 223 current_cnt1 += tmr_cnt;
vipinranka 12:9a20164dcc47 224
vipinranka 12:9a20164dcc47 225 return (current_cnt1 / ticks_per_us);
vipinranka 12:9a20164dcc47 226 }
vipinranka 12:9a20164dcc47 227
vipinranka 12:9a20164dcc47 228 //******************************************************************************
vipinranka 12:9a20164dcc47 229 void us_ticker_set_interrupt(timestamp_t timestamp)
vipinranka 12:9a20164dcc47 230 {
vipinranka 12:9a20164dcc47 231 // Note: interrupts are disabled before this function is called.
vipinranka 12:9a20164dcc47 232
vipinranka 12:9a20164dcc47 233 US_TIMER->ctrl &= ~MXC_F_TMR_CTRL_ENABLE0; // disable timer
vipinranka 12:9a20164dcc47 234
vipinranka 12:9a20164dcc47 235 if (US_TIMER->intfl) {
vipinranka 12:9a20164dcc47 236 US_TIMER->intfl = (MXC_F_TMR_INTFL_TIMER0 | MXC_F_TMR_INTFL_TIMER1); // clear interrupt
vipinranka 12:9a20164dcc47 237 NVIC_ClearPendingIRQ(US_TIMER_IRQn);
vipinranka 12:9a20164dcc47 238 inc_current_cnt(US_TIMER->term_cnt32);
vipinranka 12:9a20164dcc47 239 }
vipinranka 12:9a20164dcc47 240
vipinranka 12:9a20164dcc47 241 // add and reset the current count value
vipinranka 12:9a20164dcc47 242 inc_current_cnt(US_TIMER->count32);
vipinranka 12:9a20164dcc47 243 US_TIMER->count32 = 0;
vipinranka 12:9a20164dcc47 244
vipinranka 12:9a20164dcc47 245 // add the number of cycles that the timer is disabled here for
vipinranka 12:9a20164dcc47 246 inc_current_cnt(200);
vipinranka 12:9a20164dcc47 247
vipinranka 12:9a20164dcc47 248 event_cnt = (uint64_t)timestamp * ticks_per_us;
vipinranka 12:9a20164dcc47 249
vipinranka 12:9a20164dcc47 250 // Check to see if the event has already passed
vipinranka 12:9a20164dcc47 251 if (!event_passed(current_cnt, event_cnt)) {
vipinranka 12:9a20164dcc47 252 uint64_t diff = event_diff(current_cnt, event_cnt);
vipinranka 12:9a20164dcc47 253 if (diff < (uint64_t)0xFFFFFFFF) {
vipinranka 12:9a20164dcc47 254 // the event occurs before the next overflow
vipinranka 12:9a20164dcc47 255 US_TIMER->term_cnt32 = diff;
vipinranka 12:9a20164dcc47 256 } else {
vipinranka 12:9a20164dcc47 257 // the event occurs after the next overflow
vipinranka 12:9a20164dcc47 258 US_TIMER->term_cnt32 = 0xFFFFFFFF; // set to max
vipinranka 12:9a20164dcc47 259 }
vipinranka 12:9a20164dcc47 260 } else {
vipinranka 12:9a20164dcc47 261 // the requested timestamp occurs in the past
vipinranka 12:9a20164dcc47 262 // set the timer up to immediately expire
vipinranka 12:9a20164dcc47 263 US_TIMER->term_cnt32 = 1;
vipinranka 12:9a20164dcc47 264 }
vipinranka 12:9a20164dcc47 265 US_TIMER->ctrl |= MXC_F_TMR_CTRL_ENABLE0; // enable timer
vipinranka 12:9a20164dcc47 266 }
vipinranka 12:9a20164dcc47 267
vipinranka 12:9a20164dcc47 268 //******************************************************************************
vipinranka 12:9a20164dcc47 269 void us_ticker_disable_interrupt(void)
vipinranka 12:9a20164dcc47 270 {
vipinranka 12:9a20164dcc47 271 // There are no more events, set timer overflow to the max
vipinranka 12:9a20164dcc47 272 US_TIMER->term_cnt32 = 0xFFFFFFFF;
vipinranka 12:9a20164dcc47 273 }
vipinranka 12:9a20164dcc47 274
vipinranka 12:9a20164dcc47 275 //******************************************************************************
vipinranka 12:9a20164dcc47 276 void us_ticker_clear_interrupt(void)
vipinranka 12:9a20164dcc47 277 {
vipinranka 12:9a20164dcc47 278 // cleared in the local handler
vipinranka 12:9a20164dcc47 279 }
vipinranka 12:9a20164dcc47 280
vipinranka 12:9a20164dcc47 281 //******************************************************************************
vipinranka 12:9a20164dcc47 282 void us_ticker_set(timestamp_t timestamp)
vipinranka 12:9a20164dcc47 283 {
vipinranka 12:9a20164dcc47 284 US_TIMER->ctrl &= ~MXC_F_TMR_CTRL_ENABLE0; // disable timer
vipinranka 12:9a20164dcc47 285 current_cnt = (uint64_t)timestamp * ticks_per_us;
vipinranka 12:9a20164dcc47 286 US_TIMER->count32 = 0;
vipinranka 12:9a20164dcc47 287 US_TIMER->term_cnt32 = 0xFFFFFFFF;
vipinranka 12:9a20164dcc47 288 US_TIMER->ctrl |= MXC_F_TMR_CTRL_ENABLE0; // enable timer
vipinranka 12:9a20164dcc47 289
vipinranka 12:9a20164dcc47 290 if (((uint64_t)timestamp * ticks_per_us) >= event_cnt) {
vipinranka 12:9a20164dcc47 291 // The next timestamp has elapsed. Trigger the interrupt to handle it.
vipinranka 12:9a20164dcc47 292 NVIC_SetPendingIRQ(US_TIMER_IRQn);
vipinranka 12:9a20164dcc47 293 }
vipinranka 12:9a20164dcc47 294 }