shao ziyang / mbed-src-kl05

mbed library sources

Dependents:   frdm_kl05z_gpio_test

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_NUCLEO_F401RE/us_ticker.c@100:0412b5443284, 2014-02-19 (annotated)

Committer:
mbed_official
Date:
Wed Feb 19 17:15:16 2014 +0000
Revision:
100:0412b5443284
Parent:
96:c359415e941f
Child:
172:2f4f8c56b261
Synchronized with git revision 32764eb5d53a8f94e397b2246dba1007e1d30737



Full URL: https://github.com/mbedmicro/mbed/commit/32764eb5d53a8f94e397b2246dba1007e1d30737/



Change us_ticker timer (32-bit) on Nucleo L152RE and F401RE

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 87:085cde657901 1 /* mbed Microcontroller Library
mbed_official 87:085cde657901 2 * Copyright (c) 2014, STMicroelectronics
mbed_official 87:085cde657901 3 * All rights reserved.
mbed_official 87:085cde657901 4 *
mbed_official 87:085cde657901 5 * Redistribution and use in source and binary forms, with or without
mbed_official 87:085cde657901 6 * modification, are permitted provided that the following conditions are met:
mbed_official 87:085cde657901 7 *
mbed_official 87:085cde657901 8 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 87:085cde657901 9 * this list of conditions and the following disclaimer.
mbed_official 87:085cde657901 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 87:085cde657901 11 * this list of conditions and the following disclaimer in the documentation
mbed_official 87:085cde657901 12 * and/or other materials provided with the distribution.
mbed_official 87:085cde657901 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 87:085cde657901 14 * may be used to endorse or promote products derived from this software
mbed_official 87:085cde657901 15 * without specific prior written permission.
mbed_official 87:085cde657901 16 *
mbed_official 87:085cde657901 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 87:085cde657901 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 87:085cde657901 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 87:085cde657901 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 87:085cde657901 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 87:085cde657901 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 87:085cde657901 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 87:085cde657901 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 87:085cde657901 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 87:085cde657901 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 87:085cde657901 27 */
mbed_official 87:085cde657901 28 #include <stddef.h>
mbed_official 87:085cde657901 29 #include "us_ticker_api.h"
mbed_official 87:085cde657901 30 #include "PeripheralNames.h"
mbed_official 87:085cde657901 31 #include "stm32f4xx_hal.h"
mbed_official 87:085cde657901 32
mbed_official 100:0412b5443284 33 // 32-bit timer selection
mbed_official 100:0412b5443284 34 #define TIM_MST TIM5
mbed_official 100:0412b5443284 35 #define TIM_MST_IRQ TIM5_IRQn
mbed_official 100:0412b5443284 36 #define TIM_MST_RCC __TIM5_CLK_ENABLE()
mbed_official 87:085cde657901 37
mbed_official 87:085cde657901 38 static TIM_HandleTypeDef TimMasterHandle;
mbed_official 100:0412b5443284 39 static int us_ticker_inited = 0;
mbed_official 87:085cde657901 40
mbed_official 87:085cde657901 41 void us_ticker_init(void) {
mbed_official 87:085cde657901 42 if (us_ticker_inited) return;
mbed_official 87:085cde657901 43 us_ticker_inited = 1;
mbed_official 87:085cde657901 44
mbed_official 100:0412b5443284 45 // Enable timer clock
mbed_official 87:085cde657901 46 TIM_MST_RCC;
mbed_official 87:085cde657901 47
mbed_official 87:085cde657901 48 // Configure time base
mbed_official 87:085cde657901 49 TimMasterHandle.Instance = TIM_MST;
mbed_official 100:0412b5443284 50 TimMasterHandle.Init.Period = 0xFFFFFFFF;
mbed_official 87:085cde657901 51 TimMasterHandle.Init.Prescaler = (uint32_t)(SystemCoreClock / 1000000) - 1; // 1 µs tick
mbed_official 87:085cde657901 52 TimMasterHandle.Init.ClockDivision = 0;
mbed_official 87:085cde657901 53 TimMasterHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
mbed_official 87:085cde657901 54 TimMasterHandle.Init.RepetitionCounter = 0;
mbed_official 87:085cde657901 55 HAL_TIM_OC_Init(&TimMasterHandle);
mbed_official 87:085cde657901 56
mbed_official 100:0412b5443284 57 NVIC_SetVector(TIM_MST_IRQ, (uint32_t)us_ticker_irq_handler);
mbed_official 100:0412b5443284 58 NVIC_EnableIRQ(TIM_MST_IRQ);
mbed_official 87:085cde657901 59
mbed_official 87:085cde657901 60 // Enable timer
mbed_official 87:085cde657901 61 HAL_TIM_OC_Start(&TimMasterHandle, TIM_CHANNEL_1);
mbed_official 87:085cde657901 62 }
mbed_official 87:085cde657901 63
mbed_official 87:085cde657901 64 uint32_t us_ticker_read() {
mbed_official 87:085cde657901 65 if (!us_ticker_inited) us_ticker_init();
mbed_official 100:0412b5443284 66 return TIM_MST->CNT;
mbed_official 87:085cde657901 67 }
mbed_official 87:085cde657901 68
mbed_official 87:085cde657901 69 void us_ticker_set_interrupt(unsigned int timestamp) {
mbed_official 100:0412b5443284 70 // Set new output compare value
mbed_official 100:0412b5443284 71 __HAL_TIM_SetCompare(&TimMasterHandle, TIM_CHANNEL_1, timestamp);
mbed_official 100:0412b5443284 72 // Enable IT
mbed_official 100:0412b5443284 73 __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC1);
mbed_official 87:085cde657901 74 }
mbed_official 87:085cde657901 75
mbed_official 87:085cde657901 76 void us_ticker_disable_interrupt(void) {
mbed_official 87:085cde657901 77 __HAL_TIM_DISABLE_IT(&TimMasterHandle, TIM_IT_CC1);
mbed_official 87:085cde657901 78 }
mbed_official 87:085cde657901 79
mbed_official 87:085cde657901 80 void us_ticker_clear_interrupt(void) {
mbed_official 100:0412b5443284 81 __HAL_TIM_CLEAR_IT(&TimMasterHandle, TIM_IT_CC1);
mbed_official 87:085cde657901 82 }