mirror of https://github.com/ARMmbed/mbed-os.git
121 lines
3.3 KiB
C
121 lines
3.3 KiB
C
/* mbed Microcontroller Library
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* (C)Copyright TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION 2018 All rights reserved
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdbool.h>
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#include "us_ticker_api.h"
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#include "tmpm066_tmrb.h"
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#include "tmpm066_intifsd.h"
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#define MAX_TICK_16_BIT 0xFFFF
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static bool us_ticker_inited = false; // Is ticker initialized yet?
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void INTTB7_IRQHandler(void)
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{
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us_ticker_irq_handler();
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}
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const ticker_info_t* us_ticker_get_info()
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{
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static const ticker_info_t info = {
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3000000, // 3MHz,
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16 // 16 bit counter
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};
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return &info;
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}
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// initialize us_ticker
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void us_ticker_init(void)
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{
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TMRB_InitTypeDef m_tmrb0;
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if (us_ticker_inited) {
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us_ticker_disable_interrupt();
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return;
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}
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us_ticker_inited = true;
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// TSB_TB7 using free-run
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m_tmrb0.Mode = TMRB_INTERVAL_TIMER;
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m_tmrb0.ClkDiv = TMRB_CLK_DIV_8;
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m_tmrb0.UpCntCtrl = TMRB_FREE_RUN;
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m_tmrb0.TrailingTiming = MAX_TICK_16_BIT;
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m_tmrb0.LeadingTiming = MAX_TICK_16_BIT;
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// Enable channel 0
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TMRB_Enable(TSB_TB7);
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// Stops and clear count operation
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TMRB_SetRunState(TSB_TB7, TMRB_STOP);
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// Mask All interrupts
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TMRB_SetINTMask(TSB_TB7, TMRB_MASK_MATCH_LEADINGTIMING_INT | TMRB_MASK_MATCH_TRAILINGTIMING_INT | TMRB_MASK_OVERFLOW_INT);
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// Initialize timer
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TMRB_Init(TSB_TB7, &m_tmrb0);
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// Starts TSB_TB7
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TMRB_SetRunState(TSB_TB7, TMRB_RUN);
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}
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uint32_t us_ticker_read(void)
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{
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uint32_t ret_val = 0;
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if (!us_ticker_inited) {
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us_ticker_init();
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}
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ret_val = (uint32_t)TMRB_GetUpCntValue(TSB_TB7);
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return ret_val;
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}
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void us_ticker_set_interrupt(timestamp_t timestamp)
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{
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NVIC_DisableIRQ(INTTB7_IRQn);
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NVIC_ClearPendingIRQ(INTTB7_IRQn);
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TMRB_ChangeTrailingTiming(TSB_TB7, timestamp);
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//Mask all Interrupts except trailing edge interrupt
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TMRB_SetINTMask(TSB_TB7, TMRB_MASK_MATCH_LEADINGTIMING_INT | TMRB_MASK_OVERFLOW_INT);
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NVIC_EnableIRQ(INTTB7_IRQn);
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}
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void us_ticker_fire_interrupt(void)
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{
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NVIC_SetPendingIRQ(INTTB7_IRQn);
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NVIC_EnableIRQ(INTTB7_IRQn);
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}
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void us_ticker_disable_interrupt(void)
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{
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// Mask All interrupts
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TMRB_SetINTMask(TSB_TB7, TMRB_MASK_MATCH_LEADINGTIMING_INT | TMRB_MASK_MATCH_TRAILINGTIMING_INT | TMRB_MASK_OVERFLOW_INT);
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// Also clear and disable interrupts by NVIC
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NVIC_ClearPendingIRQ(INTTB7_IRQn);
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NVIC_DisableIRQ(INTTB7_IRQn);
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}
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void us_ticker_clear_interrupt(void)
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{
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INTIFSD_ClearINTReq(INTIFSD_INT_SRC_TMRB_7_MDOVF);
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NVIC_ClearPendingIRQ(INTTB7_IRQn);
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}
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void us_ticker_free(void)
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{
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TMRB_SetINTMask(TSB_TB7, TMRB_MASK_MATCH_LEADINGTIMING_INT | TMRB_MASK_MATCH_TRAILINGTIMING_INT | TMRB_MASK_OVERFLOW_INT);
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NVIC_ClearPendingIRQ(INTTB7_IRQn);
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NVIC_DisableIRQ(INTTB7_IRQn);
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TMRB_SetRunState(TSB_TB7, TMRB_STOP);
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TMRB_Disable(TSB_TB7);
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}
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