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This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.

Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.

If you are looking for a stable and tested release, please import one of the official mbed library releases:

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The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

Last commit 20 Feb 2019 by mbed official

targets/hal/TARGET_Freescale/TARGET_KPSDK_MCUS/TARGET_K64F/us_ticker.c@149:1fb5f62b92bd, 2014-04-03 (annotated)

Committer:
mbed_official
Date:
Thu Apr 03 11:45:06 2014 +0100
Revision:
149:1fb5f62b92bd
Parent:
targets/hal/TARGET_Freescale/TARGET_KSDK_MCUS/TARGET_K64F/us_ticker.c@146:f64d43ff0c18
Child:
304:89b9c3a9a045
Synchronized with git revision 220c0bb39ceee40016e1e86350c058963d01ed42



Full URL: https://github.com/mbedmicro/mbed/commit/220c0bb39ceee40016e1e86350c058963d01ed42/

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 146:f64d43ff0c18 1 /* mbed Microcontroller Library
mbed_official 146:f64d43ff0c18 2 * Copyright (c) 2006-2013 ARM Limited
mbed_official 146:f64d43ff0c18 3 *
mbed_official 146:f64d43ff0c18 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 146:f64d43ff0c18 5 * you may not use this file except in compliance with the License.
mbed_official 146:f64d43ff0c18 6 * You may obtain a copy of the License at
mbed_official 146:f64d43ff0c18 7 *
mbed_official 146:f64d43ff0c18 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 146:f64d43ff0c18 9 *
mbed_official 146:f64d43ff0c18 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 146:f64d43ff0c18 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 146:f64d43ff0c18 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 146:f64d43ff0c18 13 * See the License for the specific language governing permissions and
mbed_official 146:f64d43ff0c18 14 * limitations under the License.
mbed_official 146:f64d43ff0c18 15 */
mbed_official 146:f64d43ff0c18 16 #include <stddef.h>
mbed_official 146:f64d43ff0c18 17 #include "us_ticker_api.h"
mbed_official 146:f64d43ff0c18 18 #include "PeripheralNames.h"
mbed_official 146:f64d43ff0c18 19 #include "fsl_pit_hal.h"
mbed_official 146:f64d43ff0c18 20 #include "fsl_sim_hal.h"
mbed_official 146:f64d43ff0c18 21 #include "fsl_clock_manager.h"
mbed_official 146:f64d43ff0c18 22 #include "fsl_clock_configs.h"
mbed_official 146:f64d43ff0c18 23
mbed_official 146:f64d43ff0c18 24 static void pit_init(void);
mbed_official 146:f64d43ff0c18 25 static void lptmr_init(void);
mbed_official 146:f64d43ff0c18 26
mbed_official 146:f64d43ff0c18 27 static int us_ticker_inited = 0;
mbed_official 146:f64d43ff0c18 28
mbed_official 146:f64d43ff0c18 29 void us_ticker_init(void) {
mbed_official 146:f64d43ff0c18 30 if (us_ticker_inited) {
mbed_official 146:f64d43ff0c18 31 return;
mbed_official 146:f64d43ff0c18 32 }
mbed_official 146:f64d43ff0c18 33 us_ticker_inited = 1;
mbed_official 146:f64d43ff0c18 34
mbed_official 146:f64d43ff0c18 35 pit_init();
mbed_official 146:f64d43ff0c18 36 lptmr_init();
mbed_official 146:f64d43ff0c18 37 }
mbed_official 146:f64d43ff0c18 38
mbed_official 146:f64d43ff0c18 39
mbed_official 146:f64d43ff0c18 40 uint32_t us_ticker_read() {
mbed_official 146:f64d43ff0c18 41 if (!us_ticker_inited) {
mbed_official 146:f64d43ff0c18 42 us_ticker_init();
mbed_official 146:f64d43ff0c18 43 }
mbed_official 146:f64d43ff0c18 44
mbed_official 146:f64d43ff0c18 45 return ~(pit_hal_read_timer_count(1));
mbed_official 146:f64d43ff0c18 46 }
mbed_official 146:f64d43ff0c18 47 /******************************************************************************
mbed_official 146:f64d43ff0c18 48 * Timer for us timing.
mbed_official 146:f64d43ff0c18 49 ******************************************************************************/
mbed_official 146:f64d43ff0c18 50 static void pit_init(void) {
mbed_official 146:f64d43ff0c18 51 uint32_t busClock;
mbed_official 146:f64d43ff0c18 52
mbed_official 146:f64d43ff0c18 53 clock_hal_set_gate(kSimClockModulePIT, 0, true);
mbed_official 146:f64d43ff0c18 54 pit_hal_enable();
mbed_official 146:f64d43ff0c18 55 clock_manager_get_frequency(kBusClock, &busClock);
mbed_official 146:f64d43ff0c18 56 pit_hal_set_timer_period_count(0, busClock / 1000000 - 1);
mbed_official 146:f64d43ff0c18 57 pit_hal_set_timer_period_count(1, 0xFFFFFFFF);
mbed_official 146:f64d43ff0c18 58 pit_hal_configure_timer_chain(1, true);
mbed_official 146:f64d43ff0c18 59
mbed_official 146:f64d43ff0c18 60 pit_hal_timer_start(0);
mbed_official 146:f64d43ff0c18 61 pit_hal_timer_start(1);
mbed_official 146:f64d43ff0c18 62 }
mbed_official 146:f64d43ff0c18 63
mbed_official 146:f64d43ff0c18 64 /******************************************************************************
mbed_official 146:f64d43ff0c18 65 * Timer Event
mbed_official 146:f64d43ff0c18 66 *
mbed_official 146:f64d43ff0c18 67 * It schedules interrupts at given (32bit)us interval of time.
mbed_official 146:f64d43ff0c18 68 * It is implemented used the 16bit Low Power Timer that remains powered in all
mbed_official 146:f64d43ff0c18 69 * power modes.
mbed_official 146:f64d43ff0c18 70 ******************************************************************************/
mbed_official 146:f64d43ff0c18 71 static void lptmr_isr(void);
mbed_official 146:f64d43ff0c18 72
mbed_official 146:f64d43ff0c18 73 static void lptmr_init(void) {
mbed_official 146:f64d43ff0c18 74 clock_hal_set_gate(kSimClockModuleLPTIMER, 0, true);
mbed_official 146:f64d43ff0c18 75
mbed_official 146:f64d43ff0c18 76 /* Set interrupt handler */
mbed_official 146:f64d43ff0c18 77 NVIC_SetVector(LPTimer_IRQn, (uint32_t)lptmr_isr);
mbed_official 146:f64d43ff0c18 78 NVIC_EnableIRQ(LPTimer_IRQn);
mbed_official 146:f64d43ff0c18 79
mbed_official 146:f64d43ff0c18 80 /* TODO: check clock manager, due to nonstandard 50 MHz */
mbed_official 146:f64d43ff0c18 81 //No suitable external oscillator clock -> Use fast internal oscillator (4MHz / divider)
mbed_official 146:f64d43ff0c18 82 MCG->C1 |= MCG_C1_IRCLKEN_MASK;
mbed_official 146:f64d43ff0c18 83 MCG->C2 |= MCG_C2_IRCS_MASK;
mbed_official 146:f64d43ff0c18 84 LPTMR0->PSR = LPTMR_PSR_PCS(0);
mbed_official 146:f64d43ff0c18 85 switch (MCG->SC & MCG_SC_FCRDIV_MASK) {
mbed_official 146:f64d43ff0c18 86 case MCG_SC_FCRDIV(0): //4MHz
mbed_official 146:f64d43ff0c18 87 LPTMR0->PSR |= LPTMR_PSR_PRESCALE(1);
mbed_official 146:f64d43ff0c18 88 break;
mbed_official 146:f64d43ff0c18 89 case MCG_SC_FCRDIV(1): //2MHz
mbed_official 146:f64d43ff0c18 90 LPTMR0->PSR |= LPTMR_PSR_PRESCALE(0);
mbed_official 146:f64d43ff0c18 91 break;
mbed_official 146:f64d43ff0c18 92 default: //1MHz or anything else, in which case we put it on 1MHz
mbed_official 146:f64d43ff0c18 93 MCG->SC &= ~MCG_SC_FCRDIV_MASK;
mbed_official 146:f64d43ff0c18 94 MCG->SC |= MCG_SC_FCRDIV(2);
mbed_official 146:f64d43ff0c18 95 LPTMR0->PSR |= LPTMR_PSR_PBYP_MASK;
mbed_official 146:f64d43ff0c18 96 }
mbed_official 146:f64d43ff0c18 97 }
mbed_official 146:f64d43ff0c18 98
mbed_official 146:f64d43ff0c18 99 void us_ticker_disable_interrupt(void) {
mbed_official 146:f64d43ff0c18 100 BW_LPTMR_CSR_TIE(0);
mbed_official 146:f64d43ff0c18 101 }
mbed_official 146:f64d43ff0c18 102
mbed_official 146:f64d43ff0c18 103 void us_ticker_clear_interrupt(void) {
mbed_official 146:f64d43ff0c18 104 // we already clear interrupt in lptmr_isr
mbed_official 146:f64d43ff0c18 105 }
mbed_official 146:f64d43ff0c18 106
mbed_official 146:f64d43ff0c18 107 static uint32_t us_ticker_int_counter = 0;
mbed_official 146:f64d43ff0c18 108 static uint16_t us_ticker_int_remainder = 0;
mbed_official 146:f64d43ff0c18 109
mbed_official 146:f64d43ff0c18 110 static void lptmr_set(unsigned short count) {
mbed_official 146:f64d43ff0c18 111 HW_LPTMR_CSR_WR(0);
mbed_official 146:f64d43ff0c18 112 BW_LPTMR_CMR_COMPARE(count);
mbed_official 146:f64d43ff0c18 113 BW_LPTMR_CSR_TIE(1);
mbed_official 146:f64d43ff0c18 114 BW_LPTMR_CSR_TEN(1);
mbed_official 146:f64d43ff0c18 115 }
mbed_official 146:f64d43ff0c18 116
mbed_official 146:f64d43ff0c18 117 static void lptmr_isr(void) {
mbed_official 146:f64d43ff0c18 118 // write 1 to TCF to clear the LPT timer compare flag
mbed_official 146:f64d43ff0c18 119 BW_LPTMR_CSR_TCF(1);
mbed_official 146:f64d43ff0c18 120
mbed_official 146:f64d43ff0c18 121 if (us_ticker_int_counter > 0) {
mbed_official 146:f64d43ff0c18 122 lptmr_set(0xFFFF);
mbed_official 146:f64d43ff0c18 123 us_ticker_int_counter--;
mbed_official 146:f64d43ff0c18 124 } else {
mbed_official 146:f64d43ff0c18 125 if (us_ticker_int_remainder > 0) {
mbed_official 146:f64d43ff0c18 126 lptmr_set(us_ticker_int_remainder);
mbed_official 146:f64d43ff0c18 127 us_ticker_int_remainder = 0;
mbed_official 146:f64d43ff0c18 128 } else {
mbed_official 146:f64d43ff0c18 129 // This function is going to disable the interrupts if there are
mbed_official 146:f64d43ff0c18 130 // no other events in the queue
mbed_official 146:f64d43ff0c18 131 us_ticker_irq_handler();
mbed_official 146:f64d43ff0c18 132 }
mbed_official 146:f64d43ff0c18 133 }
mbed_official 146:f64d43ff0c18 134 }
mbed_official 146:f64d43ff0c18 135
mbed_official 146:f64d43ff0c18 136 void us_ticker_set_interrupt(unsigned int timestamp) {
mbed_official 146:f64d43ff0c18 137 int delta = (int)(timestamp - us_ticker_read());
mbed_official 146:f64d43ff0c18 138 if (delta <= 0) {
mbed_official 146:f64d43ff0c18 139 // This event was in the past:
mbed_official 146:f64d43ff0c18 140 us_ticker_irq_handler();
mbed_official 146:f64d43ff0c18 141 return;
mbed_official 146:f64d43ff0c18 142 }
mbed_official 146:f64d43ff0c18 143
mbed_official 146:f64d43ff0c18 144 us_ticker_int_counter = (uint32_t)(delta >> 16);
mbed_official 146:f64d43ff0c18 145 us_ticker_int_remainder = (uint16_t)(0xFFFF & delta);
mbed_official 146:f64d43ff0c18 146 if (us_ticker_int_counter > 0) {
mbed_official 146:f64d43ff0c18 147 lptmr_set(0xFFFF);
mbed_official 146:f64d43ff0c18 148 us_ticker_int_counter--;
mbed_official 146:f64d43ff0c18 149 } else {
mbed_official 146:f64d43ff0c18 150 lptmr_set(us_ticker_int_remainder);
mbed_official 146:f64d43ff0c18 151 us_ticker_int_remainder = 0;
mbed_official 146:f64d43ff0c18 152 }
mbed_official 146:f64d43ff0c18 153 }