mbed library sources
Dependents: frdm_kl05z_gpio_test
Fork of mbed-src by
targets/hal/TARGET_STM/TARGET_NUCLEO_L152RE/us_ticker.c
- Committer:
- mbed_official
- Date:
- 2014-02-19
- Revision:
- 100:0412b5443284
- Parent:
- 96:c359415e941f
- Child:
- 174:8bb9f3a33240
File content as of revision 100:0412b5443284:
/* mbed Microcontroller Library * Copyright (c) 2014, STMicroelectronics * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * 3. Neither the name of STMicroelectronics nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include <stddef.h> #include "us_ticker_api.h" #include "PeripheralNames.h" // 32-bit timer selection #define TIM_MST TIM5 #define TIM_MST_IRQ TIM5_IRQn #define TIM_MST_RCC RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE) static int us_ticker_inited = 0; void us_ticker_init(void) { TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; if (us_ticker_inited) return; us_ticker_inited = 1; // Enable timer clock TIM_MST_RCC; // Configure time base TIM_TimeBaseStructInit(&TIM_TimeBaseStructure); TIM_TimeBaseStructure.TIM_Period = 0xFFFFFFFF; TIM_TimeBaseStructure.TIM_Prescaler = (uint16_t)(SystemCoreClock / 1000000) - 1; // 1 µs tick TIM_TimeBaseStructure.TIM_ClockDivision = 0; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseInit(TIM_MST, &TIM_TimeBaseStructure); NVIC_SetVector(TIM_MST_IRQ, (uint32_t)us_ticker_irq_handler); NVIC_EnableIRQ(TIM_MST_IRQ); // Enable timer TIM_Cmd(TIM_MST, ENABLE); } uint32_t us_ticker_read() { if (!us_ticker_inited) us_ticker_init(); return TIM_MST->CNT; } void us_ticker_set_interrupt(unsigned int timestamp) { // Set new output compare value TIM_SetCompare1(TIM_MST, timestamp); // Enable IT TIM_ITConfig(TIM_MST, TIM_IT_CC1, ENABLE); } void us_ticker_disable_interrupt(void) { TIM_ITConfig(TIM_MST, TIM_IT_CC1, DISABLE); } void us_ticker_clear_interrupt(void) { TIM_ClearITPendingBit(TIM_MST, TIM_IT_CC1); }