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Dependents:   STM32_F103-C8T6basecanblink_led

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targets/TARGET_TOSHIBA/TARGET_TMPM46B/us_ticker.c@185:08ed48f1de7f, 2018-04-19 (annotated)

Committer:
AnnaBridge
Date:
Thu Apr 19 17:12:19 2018 +0100
Revision:
185:08ed48f1de7f
mbed-dev library. Release version 161

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AnnaBridge 185:08ed48f1de7f 1 /* mbed Microcontroller Library
AnnaBridge 185:08ed48f1de7f 2 * (C)Copyright TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION 2017 All rights reserved
AnnaBridge 185:08ed48f1de7f 3 *
AnnaBridge 185:08ed48f1de7f 4 * Licensed under the Apache License, Version 2.0 (the "License");
AnnaBridge 185:08ed48f1de7f 5 * you may not use this file except in compliance with the License.
AnnaBridge 185:08ed48f1de7f 6 * You may obtain a copy of the License at
AnnaBridge 185:08ed48f1de7f 7 *
AnnaBridge 185:08ed48f1de7f 8 * http://www.apache.org/licenses/LICENSE-2.0
AnnaBridge 185:08ed48f1de7f 9 *
AnnaBridge 185:08ed48f1de7f 10 * Unless required by applicable law or agreed to in writing, software
AnnaBridge 185:08ed48f1de7f 11 * distributed under the License is distributed on an "AS IS" BASIS,
AnnaBridge 185:08ed48f1de7f 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
AnnaBridge 185:08ed48f1de7f 13 * See the License for the specific language governing permissions and
AnnaBridge 185:08ed48f1de7f 14 * limitations under the License.
AnnaBridge 185:08ed48f1de7f 15 */
AnnaBridge 185:08ed48f1de7f 16 #include "us_ticker_api.h"
AnnaBridge 185:08ed48f1de7f 17 #include "tmpm46b_tmrb.h"
AnnaBridge 185:08ed48f1de7f 18
AnnaBridge 185:08ed48f1de7f 19 #define TMR16A_100US 0xFFFF
AnnaBridge 185:08ed48f1de7f 20 #define TMRB_CLK_DIV 0x3
AnnaBridge 185:08ed48f1de7f 21
AnnaBridge 185:08ed48f1de7f 22 static uint8_t us_ticker_inited = 0; // Is ticker initialized yet?
AnnaBridge 185:08ed48f1de7f 23 static volatile uint32_t us_ticker = 0; // timer counter
AnnaBridge 185:08ed48f1de7f 24
AnnaBridge 185:08ed48f1de7f 25 const ticker_info_t* us_ticker_get_info()
AnnaBridge 185:08ed48f1de7f 26 {
AnnaBridge 185:08ed48f1de7f 27 static const ticker_info_t info = {
AnnaBridge 185:08ed48f1de7f 28 1875000, // 1875000,
AnnaBridge 185:08ed48f1de7f 29 16 // 16 bit counter
AnnaBridge 185:08ed48f1de7f 30 };
AnnaBridge 185:08ed48f1de7f 31 return &info;
AnnaBridge 185:08ed48f1de7f 32 }
AnnaBridge 185:08ed48f1de7f 33
AnnaBridge 185:08ed48f1de7f 34 // initialize us_ticker
AnnaBridge 185:08ed48f1de7f 35 void us_ticker_init(void)
AnnaBridge 185:08ed48f1de7f 36 {
AnnaBridge 185:08ed48f1de7f 37 TMRB_InitTypeDef m_tmrb0;
AnnaBridge 185:08ed48f1de7f 38 TMRB_FFOutputTypeDef FFStruct;
AnnaBridge 185:08ed48f1de7f 39
AnnaBridge 185:08ed48f1de7f 40 if (us_ticker_inited) {
AnnaBridge 185:08ed48f1de7f 41 return;
AnnaBridge 185:08ed48f1de7f 42 }
AnnaBridge 185:08ed48f1de7f 43 us_ticker_inited = 1;
AnnaBridge 185:08ed48f1de7f 44
AnnaBridge 185:08ed48f1de7f 45 // Enable channel 0
AnnaBridge 185:08ed48f1de7f 46 TMRB_Enable(TSB_TB0);
AnnaBridge 185:08ed48f1de7f 47 // Stops and clear count operation
AnnaBridge 185:08ed48f1de7f 48 TMRB_SetRunState(TSB_TB0, TMRB_STOP);
AnnaBridge 185:08ed48f1de7f 49 // Disable to TBxFF0 reverse trigger
AnnaBridge 185:08ed48f1de7f 50 FFStruct.FlipflopCtrl = TMRB_FLIPFLOP_CLEAR;
AnnaBridge 185:08ed48f1de7f 51 FFStruct.FlipflopReverseTrg =TMRB_DISABLE_FLIPFLOP;
AnnaBridge 185:08ed48f1de7f 52 TMRB_SetFlipFlop(TSB_TB0, &FFStruct);
AnnaBridge 185:08ed48f1de7f 53
AnnaBridge 185:08ed48f1de7f 54 // TSB_TB0 using free-run
AnnaBridge 185:08ed48f1de7f 55 m_tmrb0.Mode = TMRB_INTERVAL_TIMER;
AnnaBridge 185:08ed48f1de7f 56 m_tmrb0.ClkDiv = TMRB_CLK_DIV;
AnnaBridge 185:08ed48f1de7f 57 m_tmrb0.UpCntCtrl = TMRB_AUTO_CLEAR;
AnnaBridge 185:08ed48f1de7f 58 m_tmrb0.TrailingTiming = TMR16A_100US;
AnnaBridge 185:08ed48f1de7f 59 m_tmrb0.LeadingTiming = TMR16A_100US;
AnnaBridge 185:08ed48f1de7f 60 TMRB_Init(TSB_TB0, &m_tmrb0);
AnnaBridge 185:08ed48f1de7f 61
AnnaBridge 185:08ed48f1de7f 62 // Enable TMRB when system is in idle mode
AnnaBridge 185:08ed48f1de7f 63 TMRB_SetIdleMode(TSB_TB0, ENABLE);
AnnaBridge 185:08ed48f1de7f 64 // Starts TSB_TB0
AnnaBridge 185:08ed48f1de7f 65 TMRB_SetRunState(TSB_TB0, TMRB_RUN);
AnnaBridge 185:08ed48f1de7f 66 }
AnnaBridge 185:08ed48f1de7f 67
AnnaBridge 185:08ed48f1de7f 68 uint32_t us_ticker_read(void)
AnnaBridge 185:08ed48f1de7f 69 {
AnnaBridge 185:08ed48f1de7f 70 uint32_t ret_val = 0;
AnnaBridge 185:08ed48f1de7f 71
AnnaBridge 185:08ed48f1de7f 72 if (!us_ticker_inited) {
AnnaBridge 185:08ed48f1de7f 73 us_ticker_init();
AnnaBridge 185:08ed48f1de7f 74 }
AnnaBridge 185:08ed48f1de7f 75
AnnaBridge 185:08ed48f1de7f 76 ret_val = (uint32_t)TMRB_GetUpCntValue(TSB_TB0);
AnnaBridge 185:08ed48f1de7f 77
AnnaBridge 185:08ed48f1de7f 78 return ret_val;
AnnaBridge 185:08ed48f1de7f 79 }
AnnaBridge 185:08ed48f1de7f 80
AnnaBridge 185:08ed48f1de7f 81 void us_ticker_set_interrupt(timestamp_t timestamp)
AnnaBridge 185:08ed48f1de7f 82 {
AnnaBridge 185:08ed48f1de7f 83 TMRB_InitTypeDef m_tmrb1;
AnnaBridge 185:08ed48f1de7f 84 TMRB_FFOutputTypeDef FFStruct;
AnnaBridge 185:08ed48f1de7f 85
AnnaBridge 185:08ed48f1de7f 86 const uint32_t now_ticks = us_ticker_read();
AnnaBridge 185:08ed48f1de7f 87 uint32_t delta_ticks =
AnnaBridge 185:08ed48f1de7f 88 timestamp >= now_ticks ? timestamp - now_ticks : (uint32_t)((uint64_t) timestamp + 0xFFFF - now_ticks);
AnnaBridge 185:08ed48f1de7f 89
AnnaBridge 185:08ed48f1de7f 90 if (delta_ticks == 0) {
AnnaBridge 185:08ed48f1de7f 91 /* The requested delay is less than the minimum resolution of this counter. */
AnnaBridge 185:08ed48f1de7f 92 delta_ticks = 1;
AnnaBridge 185:08ed48f1de7f 93 }
AnnaBridge 185:08ed48f1de7f 94
AnnaBridge 185:08ed48f1de7f 95 // Ticker interrupt handle
AnnaBridge 185:08ed48f1de7f 96 TMRB_Enable(TSB_TB1);
AnnaBridge 185:08ed48f1de7f 97 TMRB_SetRunState(TSB_TB1, TMRB_STOP);
AnnaBridge 185:08ed48f1de7f 98 NVIC_SetVector(INTTB1_IRQn, (uint32_t)us_ticker_irq_handler);
AnnaBridge 185:08ed48f1de7f 99 NVIC_EnableIRQ(INTTB1_IRQn);
AnnaBridge 185:08ed48f1de7f 100
AnnaBridge 185:08ed48f1de7f 101 // Split delta for preventing the Multiply overflowing
AnnaBridge 185:08ed48f1de7f 102 FFStruct.FlipflopCtrl = TMRB_FLIPFLOP_CLEAR;
AnnaBridge 185:08ed48f1de7f 103 FFStruct.FlipflopReverseTrg = TMRB_DISABLE_FLIPFLOP;
AnnaBridge 185:08ed48f1de7f 104 TMRB_SetFlipFlop(TSB_TB1, &FFStruct);
AnnaBridge 185:08ed48f1de7f 105
AnnaBridge 185:08ed48f1de7f 106 // TSB_TB0 using free-run
AnnaBridge 185:08ed48f1de7f 107 m_tmrb1.Mode = TMRB_INTERVAL_TIMER;
AnnaBridge 185:08ed48f1de7f 108 m_tmrb1.ClkDiv = TMRB_CLK_DIV;
AnnaBridge 185:08ed48f1de7f 109 m_tmrb1.UpCntCtrl = TMRB_AUTO_CLEAR;
AnnaBridge 185:08ed48f1de7f 110 m_tmrb1.TrailingTiming = delta_ticks;
AnnaBridge 185:08ed48f1de7f 111 m_tmrb1.LeadingTiming = delta_ticks;
AnnaBridge 185:08ed48f1de7f 112 TMRB_Init(TSB_TB1, &m_tmrb1);
AnnaBridge 185:08ed48f1de7f 113 TMRB_SetINTMask(TSB_TB1,TMRB_MASK_OVERFLOW_INT | TMRB_MASK_MATCH_LEADING_INT);
AnnaBridge 185:08ed48f1de7f 114 // Enable TMRB when system is in idle mode
AnnaBridge 185:08ed48f1de7f 115 TMRB_SetIdleMode(TSB_TB1, ENABLE);
AnnaBridge 185:08ed48f1de7f 116 TMRB_SetRunState(TSB_TB1, TMRB_RUN);
AnnaBridge 185:08ed48f1de7f 117 }
AnnaBridge 185:08ed48f1de7f 118
AnnaBridge 185:08ed48f1de7f 119 void us_ticker_fire_interrupt(void)
AnnaBridge 185:08ed48f1de7f 120 {
AnnaBridge 185:08ed48f1de7f 121 NVIC_SetPendingIRQ(INTTB1_IRQn);
AnnaBridge 185:08ed48f1de7f 122 }
AnnaBridge 185:08ed48f1de7f 123
AnnaBridge 185:08ed48f1de7f 124 void us_ticker_disable_interrupt(void)
AnnaBridge 185:08ed48f1de7f 125 {
AnnaBridge 185:08ed48f1de7f 126 // Also disable interrupts by NVIC
AnnaBridge 185:08ed48f1de7f 127 NVIC_DisableIRQ(INTTB1_IRQn);
AnnaBridge 185:08ed48f1de7f 128 }
AnnaBridge 185:08ed48f1de7f 129
AnnaBridge 185:08ed48f1de7f 130 void us_ticker_clear_interrupt(void)
AnnaBridge 185:08ed48f1de7f 131 {
AnnaBridge 185:08ed48f1de7f 132 // No flag to clear
AnnaBridge 185:08ed48f1de7f 133 }