mbed library sources
Dependents: frdm_kl05z_gpio_test
Fork of mbed-src by
Diff: targets/hal/TARGET_STM/TARGET_NUCLEO_F072RB/us_ticker.c
- Revision:
- 219:993c9b0acbcc
- Child:
- 304:89b9c3a9a045
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/targets/hal/TARGET_STM/TARGET_NUCLEO_F072RB/us_ticker.c Mon Jun 02 09:45:07 2014 +0100 @@ -0,0 +1,84 @@ +/* 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 TIM2 +#define TIM_MST_IRQ TIM2_IRQn +#define TIM_MST_RCC __TIM2_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; + + // Update the SystemCoreClock variable + SystemCoreClockUpdate(); + + // Enable timer clock + TIM_MST_RCC; + + // Configure time base + TimMasterHandle.Instance = TIM_MST; + TimMasterHandle.Init.Period = 0xFFFFFFFF; + TimMasterHandle.Init.Prescaler = (uint32_t)(SystemCoreClock / 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); +}