erkin yucel / mbed-os

mbed os with nrf51 internal bandgap enabled to read battery level

Dependents:   BLE_file_test BLE_Blink ExternalEncoder

targets/TARGET_STM/TARGET_STM32L0/us_ticker.c@0:f269e3021894, 2016-10-23 (annotated)

Committer:
elessair
Date:
Sun Oct 23 15:10:02 2016 +0000
Revision:
0:f269e3021894
Initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
elessair 0:f269e3021894 1 /* mbed Microcontroller Library
elessair 0:f269e3021894 2 * Copyright (c) 2015, STMicroelectronics
elessair 0:f269e3021894 3 * All rights reserved.
elessair 0:f269e3021894 4 *
elessair 0:f269e3021894 5 * Redistribution and use in source and binary forms, with or without
elessair 0:f269e3021894 6 * modification, are permitted provided that the following conditions are met:
elessair 0:f269e3021894 7 *
elessair 0:f269e3021894 8 * 1. Redistributions of source code must retain the above copyright notice,
elessair 0:f269e3021894 9 * this list of conditions and the following disclaimer.
elessair 0:f269e3021894 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
elessair 0:f269e3021894 11 * this list of conditions and the following disclaimer in the documentation
elessair 0:f269e3021894 12 * and/or other materials provided with the distribution.
elessair 0:f269e3021894 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
elessair 0:f269e3021894 14 * may be used to endorse or promote products derived from this software
elessair 0:f269e3021894 15 * without specific prior written permission.
elessair 0:f269e3021894 16 *
elessair 0:f269e3021894 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
elessair 0:f269e3021894 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
elessair 0:f269e3021894 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
elessair 0:f269e3021894 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
elessair 0:f269e3021894 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
elessair 0:f269e3021894 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
elessair 0:f269e3021894 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
elessair 0:f269e3021894 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
elessair 0:f269e3021894 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
elessair 0:f269e3021894 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
elessair 0:f269e3021894 27 */
elessair 0:f269e3021894 28 #include <stddef.h>
elessair 0:f269e3021894 29 #include <stdbool.h>
elessair 0:f269e3021894 30 #include "us_ticker_api.h"
elessair 0:f269e3021894 31 #include "PeripheralNames.h"
elessair 0:f269e3021894 32
elessair 0:f269e3021894 33 // Timer selection
elessair 0:f269e3021894 34 #define TIM_MST TIM21
elessair 0:f269e3021894 35
elessair 0:f269e3021894 36 static TIM_HandleTypeDef TimMasterHandle;
elessair 0:f269e3021894 37 static int us_ticker_inited = 0;
elessair 0:f269e3021894 38
elessair 0:f269e3021894 39 volatile uint16_t SlaveCounter = 0;
elessair 0:f269e3021894 40 volatile uint32_t oc_int_part = 0;
elessair 0:f269e3021894 41 volatile uint16_t oc_rem_part = 0;
elessair 0:f269e3021894 42
elessair 0:f269e3021894 43 void set_compare(uint16_t count)
elessair 0:f269e3021894 44 {
elessair 0:f269e3021894 45 TimMasterHandle.Instance = TIM_MST;
elessair 0:f269e3021894 46 // Set new output compare value
elessair 0:f269e3021894 47 __HAL_TIM_SetCompare(&TimMasterHandle, TIM_CHANNEL_1, count);
elessair 0:f269e3021894 48 // Enable IT
elessair 0:f269e3021894 49 __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC1);
elessair 0:f269e3021894 50 }
elessair 0:f269e3021894 51
elessair 0:f269e3021894 52 void us_ticker_init(void)
elessair 0:f269e3021894 53 {
elessair 0:f269e3021894 54 if (us_ticker_inited) return;
elessair 0:f269e3021894 55 us_ticker_inited = 1;
elessair 0:f269e3021894 56
elessair 0:f269e3021894 57 HAL_InitTick(0); // The passed value is not used
elessair 0:f269e3021894 58 }
elessair 0:f269e3021894 59
elessair 0:f269e3021894 60 uint32_t us_ticker_read()
elessair 0:f269e3021894 61 {
elessair 0:f269e3021894 62 volatile uint16_t cntH_old, cntH, cntL;
elessair 0:f269e3021894 63
elessair 0:f269e3021894 64 if (!us_ticker_inited) us_ticker_init();
elessair 0:f269e3021894 65
elessair 0:f269e3021894 66 do {
elessair 0:f269e3021894 67 // For some reason on L0xx series we need to read and clear the
elessair 0:f269e3021894 68 // overflow flag which give extra time to propelry handle possible
elessair 0:f269e3021894 69 // hiccup after ~60s
elessair 0:f269e3021894 70 if (__HAL_TIM_GET_FLAG(&TimMasterHandle, TIM_FLAG_CC1OF) == SET) {
elessair 0:f269e3021894 71 __HAL_TIM_CLEAR_FLAG(&TimMasterHandle, TIM_FLAG_CC1OF);
elessair 0:f269e3021894 72 }
elessair 0:f269e3021894 73 cntH_old = SlaveCounter;
elessair 0:f269e3021894 74 if (__HAL_TIM_GET_FLAG(&TimMasterHandle, TIM_FLAG_UPDATE) == SET) {
elessair 0:f269e3021894 75 cntH_old += 1;
elessair 0:f269e3021894 76 }
elessair 0:f269e3021894 77 cntL = TIM_MST->CNT;
elessair 0:f269e3021894 78
elessair 0:f269e3021894 79 cntH = SlaveCounter;
elessair 0:f269e3021894 80 if (__HAL_TIM_GET_FLAG(&TimMasterHandle, TIM_FLAG_UPDATE) == SET) {
elessair 0:f269e3021894 81 cntH += 1;
elessair 0:f269e3021894 82 }
elessair 0:f269e3021894 83 } while(cntH_old != cntH);
elessair 0:f269e3021894 84
elessair 0:f269e3021894 85 // Glue the upper and lower part together to get a 32 bit timer
elessair 0:f269e3021894 86 return (uint32_t)(cntH << 16 | cntL);
elessair 0:f269e3021894 87 }
elessair 0:f269e3021894 88
elessair 0:f269e3021894 89 void us_ticker_set_interrupt(timestamp_t timestamp)
elessair 0:f269e3021894 90 {
elessair 0:f269e3021894 91 int delta = (int)((uint32_t)timestamp - us_ticker_read());
elessair 0:f269e3021894 92 uint16_t cval = TIM_MST->CNT;
elessair 0:f269e3021894 93
elessair 0:f269e3021894 94 if (delta <= 0) { // This event was in the past
elessair 0:f269e3021894 95 us_ticker_irq_handler();
elessair 0:f269e3021894 96 } else {
elessair 0:f269e3021894 97 oc_int_part = (uint32_t)(delta >> 16);
elessair 0:f269e3021894 98 oc_rem_part = (uint16_t)(delta & 0xFFFF);
elessair 0:f269e3021894 99 if (oc_rem_part <= (0xFFFF - cval)) {
elessair 0:f269e3021894 100 set_compare(cval + oc_rem_part);
elessair 0:f269e3021894 101 oc_rem_part = 0;
elessair 0:f269e3021894 102 } else {
elessair 0:f269e3021894 103 set_compare(0xFFFF);
elessair 0:f269e3021894 104 oc_rem_part = oc_rem_part - (0xFFFF - cval);
elessair 0:f269e3021894 105 }
elessair 0:f269e3021894 106 }
elessair 0:f269e3021894 107 }
elessair 0:f269e3021894 108
elessair 0:f269e3021894 109 void us_ticker_disable_interrupt(void)
elessair 0:f269e3021894 110 {
elessair 0:f269e3021894 111 TimMasterHandle.Instance = TIM_MST;
elessair 0:f269e3021894 112 __HAL_TIM_DISABLE_IT(&TimMasterHandle, TIM_IT_CC1);
elessair 0:f269e3021894 113 }
elessair 0:f269e3021894 114
elessair 0:f269e3021894 115 void us_ticker_clear_interrupt(void)
elessair 0:f269e3021894 116 {
elessair 0:f269e3021894 117 TimMasterHandle.Instance = TIM_MST;
elessair 0:f269e3021894 118 if (__HAL_TIM_GET_FLAG(&TimMasterHandle, TIM_FLAG_CC1) == SET) {
elessair 0:f269e3021894 119 __HAL_TIM_CLEAR_FLAG(&TimMasterHandle, TIM_FLAG_CC1);
elessair 0:f269e3021894 120 }
elessair 0:f269e3021894 121 }