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mbed SDK library sources

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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:

Import librarymbed

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_STM/TARGET_NUCLEO_F030R8/us_ticker.c@84:f54042cbc282, 2014-02-03 (annotated)

Committer:
mbed_official
Date:
Mon Feb 03 09:30:05 2014 +0000
Revision:
84:f54042cbc282
Parent:
76:aeb1df146756
Child:
87:085cde657901
Synchronized with git revision bbbd8699601c42149ccf0c37bc42bb6856ccc4c6



Full URL: https://github.com/mbedmicro/mbed/commit/bbbd8699601c42149ccf0c37bc42bb6856ccc4c6/



[NUCLEO_L152RE/F030_R8] SPI, I2C, Ticker, PWM updates

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 76:aeb1df146756 1 /* mbed Microcontroller Library
mbed_official 76:aeb1df146756 2 * Copyright (c) 2014, STMicroelectronics
mbed_official 76:aeb1df146756 3 * All rights reserved.
mbed_official 76:aeb1df146756 4 *
mbed_official 76:aeb1df146756 5 * Redistribution and use in source and binary forms, with or without
mbed_official 76:aeb1df146756 6 * modification, are permitted provided that the following conditions are met:
mbed_official 76:aeb1df146756 7 *
mbed_official 76:aeb1df146756 8 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 76:aeb1df146756 9 * this list of conditions and the following disclaimer.
mbed_official 76:aeb1df146756 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 76:aeb1df146756 11 * this list of conditions and the following disclaimer in the documentation
mbed_official 76:aeb1df146756 12 * and/or other materials provided with the distribution.
mbed_official 76:aeb1df146756 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 76:aeb1df146756 14 * may be used to endorse or promote products derived from this software
mbed_official 76:aeb1df146756 15 * without specific prior written permission.
mbed_official 76:aeb1df146756 16 *
mbed_official 76:aeb1df146756 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 76:aeb1df146756 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 76:aeb1df146756 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 76:aeb1df146756 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 76:aeb1df146756 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 76:aeb1df146756 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 76:aeb1df146756 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 76:aeb1df146756 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 76:aeb1df146756 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 76:aeb1df146756 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 76:aeb1df146756 27 */
mbed_official 76:aeb1df146756 28 #include <stddef.h>
mbed_official 76:aeb1df146756 29 #include "us_ticker_api.h"
mbed_official 76:aeb1df146756 30 #include "PeripheralNames.h"
mbed_official 76:aeb1df146756 31
mbed_official 84:f54042cbc282 32 // Timer selection:
mbed_official 84:f54042cbc282 33 #define TIM_MST TIM1
mbed_official 84:f54042cbc282 34 #define TIM_MST_UP_IRQ TIM1_BRK_UP_TRG_COM_IRQn
mbed_official 84:f54042cbc282 35 #define TIM_MST_OC_IRQ TIM1_CC_IRQn
mbed_official 84:f54042cbc282 36 #define TIM_MST_RCC RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE)
mbed_official 76:aeb1df146756 37
mbed_official 84:f54042cbc282 38 static int us_ticker_inited = 0;
mbed_official 84:f54042cbc282 39 static uint32_t SlaveCounter = 0;
mbed_official 84:f54042cbc282 40 static uint32_t us_ticker_int_counter = 0;
mbed_official 84:f54042cbc282 41 static uint16_t us_ticker_int_remainder = 0;
mbed_official 84:f54042cbc282 42
mbed_official 84:f54042cbc282 43 // Used to increment the slave counter
mbed_official 84:f54042cbc282 44 static void tim_update_irq_handler(void) {
mbed_official 84:f54042cbc282 45 SlaveCounter++;
mbed_official 84:f54042cbc282 46 if (TIM_GetITStatus(TIM_MST, TIM_IT_Update) == SET) {
mbed_official 84:f54042cbc282 47 TIM_ClearITPendingBit(TIM_MST, TIM_IT_Update);
mbed_official 84:f54042cbc282 48 }
mbed_official 84:f54042cbc282 49 }
mbed_official 76:aeb1df146756 50
mbed_official 84:f54042cbc282 51 // Used by interrupt system
mbed_official 84:f54042cbc282 52 static void tim_oc_irq_handler(void) {
mbed_official 84:f54042cbc282 53 // Clear interrupt flag
mbed_official 84:f54042cbc282 54 if (TIM_GetITStatus(TIM_MST, TIM_IT_CC1) == SET) {
mbed_official 84:f54042cbc282 55 TIM_ClearITPendingBit(TIM_MST, TIM_IT_CC1);
mbed_official 84:f54042cbc282 56 }
mbed_official 84:f54042cbc282 57
mbed_official 84:f54042cbc282 58 if (us_ticker_int_counter > 0) {
mbed_official 84:f54042cbc282 59 TIM_SetCompare1(TIM_MST, 0xFFFF);
mbed_official 84:f54042cbc282 60 us_ticker_int_counter--;
mbed_official 84:f54042cbc282 61 } else {
mbed_official 84:f54042cbc282 62 if (us_ticker_int_remainder > 0) {
mbed_official 84:f54042cbc282 63 TIM_SetCompare1(TIM_MST, us_ticker_int_remainder);
mbed_official 84:f54042cbc282 64 us_ticker_int_remainder = 0;
mbed_official 84:f54042cbc282 65 } else {
mbed_official 84:f54042cbc282 66 // This function is going to disable the interrupts if there are
mbed_official 84:f54042cbc282 67 // no other events in the queue
mbed_official 84:f54042cbc282 68 us_ticker_irq_handler();
mbed_official 84:f54042cbc282 69 }
mbed_official 84:f54042cbc282 70 }
mbed_official 84:f54042cbc282 71 }
mbed_official 76:aeb1df146756 72
mbed_official 84:f54042cbc282 73 void us_ticker_init(void) {
mbed_official 76:aeb1df146756 74 TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
mbed_official 84:f54042cbc282 75
mbed_official 76:aeb1df146756 76 if (us_ticker_inited) return;
mbed_official 76:aeb1df146756 77 us_ticker_inited = 1;
mbed_official 76:aeb1df146756 78
mbed_official 84:f54042cbc282 79 // Enable Timer clock
mbed_official 76:aeb1df146756 80 TIM_MST_RCC;
mbed_official 76:aeb1df146756 81
mbed_official 84:f54042cbc282 82 // Configure time base
mbed_official 76:aeb1df146756 83 TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
mbed_official 76:aeb1df146756 84 TIM_TimeBaseStructure.TIM_Period = 0xFFFF;
mbed_official 76:aeb1df146756 85 TIM_TimeBaseStructure.TIM_Prescaler = (uint16_t)(SystemCoreClock / 1000000) - 1; // 1 µs tick
mbed_official 76:aeb1df146756 86 TIM_TimeBaseStructure.TIM_ClockDivision = 0;
mbed_official 76:aeb1df146756 87 TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
mbed_official 76:aeb1df146756 88 TIM_TimeBaseInit(TIM_MST, &TIM_TimeBaseStructure);
mbed_official 84:f54042cbc282 89
mbed_official 84:f54042cbc282 90 // Configure interrupts
mbed_official 84:f54042cbc282 91 TIM_ITConfig(TIM_MST, TIM_IT_Update, ENABLE);
mbed_official 84:f54042cbc282 92 TIM_ITConfig(TIM_MST, TIM_IT_CC1, ENABLE);
mbed_official 76:aeb1df146756 93
mbed_official 84:f54042cbc282 94 // For 32-bit counter
mbed_official 84:f54042cbc282 95 NVIC_SetVector(TIM_MST_UP_IRQ, (uint32_t)tim_update_irq_handler);
mbed_official 84:f54042cbc282 96 NVIC_EnableIRQ(TIM_MST_UP_IRQ);
mbed_official 84:f54042cbc282 97
mbed_official 84:f54042cbc282 98 // For ouput compare
mbed_official 84:f54042cbc282 99 NVIC_SetVector(TIM_MST_OC_IRQ, (uint32_t)tim_oc_irq_handler);
mbed_official 84:f54042cbc282 100 NVIC_EnableIRQ(TIM_MST_OC_IRQ);
mbed_official 76:aeb1df146756 101
mbed_official 84:f54042cbc282 102 // Enable timer
mbed_official 76:aeb1df146756 103 TIM_Cmd(TIM_MST, ENABLE);
mbed_official 76:aeb1df146756 104 }
mbed_official 76:aeb1df146756 105
mbed_official 76:aeb1df146756 106 uint32_t us_ticker_read() {
mbed_official 76:aeb1df146756 107 uint32_t counter, counter2;
mbed_official 76:aeb1df146756 108 if (!us_ticker_inited) us_ticker_init();
mbed_official 76:aeb1df146756 109 // A situation might appear when Master overflows right after Slave is read and before the
mbed_official 76:aeb1df146756 110 // new (overflowed) value of Master is read. Which would make the code below consider the
mbed_official 76:aeb1df146756 111 // previous (incorrect) value of Slave and the new value of Master, which would return a
mbed_official 76:aeb1df146756 112 // value in the past. Avoid this by computing consecutive values of the timer until they
mbed_official 76:aeb1df146756 113 // are properly ordered.
mbed_official 84:f54042cbc282 114 counter = (uint32_t)(SlaveCounter << 16);
mbed_official 76:aeb1df146756 115 counter += (uint32_t)TIM_GetCounter(TIM_MST);
mbed_official 76:aeb1df146756 116 while (1) {
mbed_official 84:f54042cbc282 117 counter2 = (uint32_t)(SlaveCounter << 16);
mbed_official 76:aeb1df146756 118 counter2 += (uint32_t)TIM_GetCounter(TIM_MST);
mbed_official 76:aeb1df146756 119 if (counter2 > counter) {
mbed_official 76:aeb1df146756 120 break;
mbed_official 76:aeb1df146756 121 }
mbed_official 76:aeb1df146756 122 counter = counter2;
mbed_official 76:aeb1df146756 123 }
mbed_official 76:aeb1df146756 124 return counter2;
mbed_official 76:aeb1df146756 125 }
mbed_official 76:aeb1df146756 126
mbed_official 76:aeb1df146756 127 void us_ticker_set_interrupt(unsigned int timestamp) {
mbed_official 84:f54042cbc282 128 int delta = (int)(timestamp - us_ticker_read());
mbed_official 84:f54042cbc282 129
mbed_official 84:f54042cbc282 130 if (delta <= 0) { // This event was in the past
mbed_official 84:f54042cbc282 131 us_ticker_irq_handler();
mbed_official 84:f54042cbc282 132 return;
mbed_official 76:aeb1df146756 133 }
mbed_official 76:aeb1df146756 134 else {
mbed_official 84:f54042cbc282 135 us_ticker_int_counter = (uint32_t)(delta >> 16);
mbed_official 84:f54042cbc282 136 us_ticker_int_remainder = (uint16_t)(delta & 0xFFFF);
mbed_official 84:f54042cbc282 137 if (us_ticker_int_counter > 0) { // means delta > 0xFFFF
mbed_official 84:f54042cbc282 138 TIM_SetCompare1(TIM_MST, 0xFFFF);
mbed_official 84:f54042cbc282 139 us_ticker_int_counter--;
mbed_official 84:f54042cbc282 140 } else {
mbed_official 84:f54042cbc282 141 TIM_SetCompare1(TIM_MST, us_ticker_int_remainder);
mbed_official 84:f54042cbc282 142 us_ticker_int_remainder = 0;
mbed_official 84:f54042cbc282 143 }
mbed_official 76:aeb1df146756 144 }
mbed_official 76:aeb1df146756 145 }
mbed_official 76:aeb1df146756 146
mbed_official 76:aeb1df146756 147 void us_ticker_disable_interrupt(void) {
mbed_official 76:aeb1df146756 148 TIM_ITConfig(TIM_MST, TIM_IT_CC1, DISABLE);
mbed_official 76:aeb1df146756 149 }
mbed_official 76:aeb1df146756 150
mbed_official 76:aeb1df146756 151 void us_ticker_clear_interrupt(void) {
mbed_official 84:f54042cbc282 152 if (TIM_GetITStatus(TIM_MST, TIM_IT_CC1) == SET) {
mbed_official 84:f54042cbc282 153 TIM_ClearITPendingBit(TIM_MST, TIM_IT_CC1);
mbed_official 84:f54042cbc282 154 }
mbed_official 76:aeb1df146756 155 }