mbed library sources
Dependents: frdm_kl05z_gpio_test
Fork of mbed-src by
targets/hal/TARGET_STM/TARGET_DISCO_F407VG/us_ticker.c
- Committer:
- mbed_official
- Date:
- 2014-03-24
- Revision:
- 133:d4dda5c437f0
- Child:
- 242:7074e42da0b2
File content as of revision 133:d4dda5c437f0:
/* 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" #include "stm32f4xx_hal.h" // 32-bit timer selection #define TIM_MST TIM5 #define TIM_MST_IRQ TIM5_IRQn #define TIM_MST_RCC __TIM5_CLK_ENABLE() static TIM_HandleTypeDef TimMasterHandle; static int us_ticker_inited = 0; void us_ticker_init(void) { if (us_ticker_inited) return; us_ticker_inited = 1; // Enable timer clock TIM_MST_RCC; // Configure time base TimMasterHandle.Instance = TIM_MST; TimMasterHandle.Init.Period = 0xFFFFFFFF; TimMasterHandle.Init.Prescaler = (uint32_t)(SystemCoreClock / 2 / 1000000) - 1; // 1 µs tick TimMasterHandle.Init.ClockDivision = 0; TimMasterHandle.Init.CounterMode = TIM_COUNTERMODE_UP; TimMasterHandle.Init.RepetitionCounter = 0; HAL_TIM_OC_Init(&TimMasterHandle); NVIC_SetVector(TIM_MST_IRQ, (uint32_t)us_ticker_irq_handler); NVIC_EnableIRQ(TIM_MST_IRQ); // Enable timer HAL_TIM_OC_Start(&TimMasterHandle, TIM_CHANNEL_1); } 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 __HAL_TIM_SetCompare(&TimMasterHandle, TIM_CHANNEL_1, timestamp); // Enable IT __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC1); } void us_ticker_disable_interrupt(void) { __HAL_TIM_DISABLE_IT(&TimMasterHandle, TIM_IT_CC1); } void us_ticker_clear_interrupt(void) { __HAL_TIM_CLEAR_IT(&TimMasterHandle, TIM_IT_CC1); }