mbed official / mbed-dev

mbed library sources. Supersedes mbed-src.

Dependents:   Nucleo_Hello_Encoder BLE_iBeaconScan AM1805_DEMO DISCO-F429ZI_ExportTemplate1 ... more

targets/TARGET_TOSHIBA/TARGET_TMPM46B/us_ticker.c@189:f392fc9709a3, 2019-02-20 (annotated)

Committer:
AnnaBridge
Date:
Wed Feb 20 22:31:08 2019 +0000
Revision:
189:f392fc9709a3
Parent:
188:bcfe06ba3d64 
mbed library release version 165

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AnnaBridge 184:08ed48f1de7f 1 /* mbed Microcontroller Library
AnnaBridge 188:bcfe06ba3d64 2 * (C)Copyright TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION 2018 All rights reserved
AnnaBridge 184:08ed48f1de7f 3 *
AnnaBridge 184:08ed48f1de7f 4 * Licensed under the Apache License, Version 2.0 (the "License");
AnnaBridge 184:08ed48f1de7f 5 * you may not use this file except in compliance with the License.
AnnaBridge 184:08ed48f1de7f 6 * You may obtain a copy of the License at
AnnaBridge 184:08ed48f1de7f 7 *
AnnaBridge 184:08ed48f1de7f 8 * http://www.apache.org/licenses/LICENSE-2.0
AnnaBridge 184:08ed48f1de7f 9 *
AnnaBridge 184:08ed48f1de7f 10 * Unless required by applicable law or agreed to in writing, software
AnnaBridge 184:08ed48f1de7f 11 * distributed under the License is distributed on an "AS IS" BASIS,
AnnaBridge 184:08ed48f1de7f 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
AnnaBridge 184:08ed48f1de7f 13 * See the License for the specific language governing permissions and
AnnaBridge 184:08ed48f1de7f 14 * limitations under the License.
AnnaBridge 184:08ed48f1de7f 15 */
AnnaBridge 188:bcfe06ba3d64 16 #include <stdbool.h>
AnnaBridge 184:08ed48f1de7f 17 #include "us_ticker_api.h"
AnnaBridge 184:08ed48f1de7f 18 #include "tmpm46b_tmrb.h"
AnnaBridge 184:08ed48f1de7f 19
AnnaBridge 188:bcfe06ba3d64 20 #define MAX_TICK_16_BIT 0xFFFF
AnnaBridge 188:bcfe06ba3d64 21 #define TMRB_CLK_DIV 0x3
AnnaBridge 184:08ed48f1de7f 22
AnnaBridge 188:bcfe06ba3d64 23 static bool us_ticker_inited = false; // Is ticker initialized yet?
AnnaBridge 184:08ed48f1de7f 24
AnnaBridge 184:08ed48f1de7f 25 const ticker_info_t* us_ticker_get_info()
AnnaBridge 184:08ed48f1de7f 26 {
AnnaBridge 184:08ed48f1de7f 27 static const ticker_info_t info = {
AnnaBridge 184:08ed48f1de7f 28 1875000, // 1875000,
AnnaBridge 184:08ed48f1de7f 29 16 // 16 bit counter
AnnaBridge 184:08ed48f1de7f 30 };
AnnaBridge 184:08ed48f1de7f 31 return &info;
AnnaBridge 184:08ed48f1de7f 32 }
AnnaBridge 184:08ed48f1de7f 33
AnnaBridge 184:08ed48f1de7f 34 // initialize us_ticker
AnnaBridge 184:08ed48f1de7f 35 void us_ticker_init(void)
AnnaBridge 184:08ed48f1de7f 36 {
AnnaBridge 184:08ed48f1de7f 37 TMRB_InitTypeDef m_tmrb0;
AnnaBridge 184:08ed48f1de7f 38
AnnaBridge 184:08ed48f1de7f 39 if (us_ticker_inited) {
AnnaBridge 188:bcfe06ba3d64 40 us_ticker_disable_interrupt();
AnnaBridge 184:08ed48f1de7f 41 return;
AnnaBridge 184:08ed48f1de7f 42 }
AnnaBridge 188:bcfe06ba3d64 43 us_ticker_inited = true;
AnnaBridge 188:bcfe06ba3d64 44
AnnaBridge 188:bcfe06ba3d64 45 // TSB_TB0 using free-run
AnnaBridge 188:bcfe06ba3d64 46 m_tmrb0.Mode = TMRB_INTERVAL_TIMER;
AnnaBridge 188:bcfe06ba3d64 47 m_tmrb0.ClkDiv = TMRB_CLK_DIV;
AnnaBridge 188:bcfe06ba3d64 48 m_tmrb0.UpCntCtrl = TMRB_FREE_RUN;
AnnaBridge 188:bcfe06ba3d64 49 m_tmrb0.TrailingTiming = MAX_TICK_16_BIT;
AnnaBridge 188:bcfe06ba3d64 50 m_tmrb0.LeadingTiming = MAX_TICK_16_BIT;
AnnaBridge 184:08ed48f1de7f 51
AnnaBridge 184:08ed48f1de7f 52 // Enable channel 0
AnnaBridge 184:08ed48f1de7f 53 TMRB_Enable(TSB_TB0);
AnnaBridge 184:08ed48f1de7f 54 // Stops and clear count operation
AnnaBridge 184:08ed48f1de7f 55 TMRB_SetRunState(TSB_TB0, TMRB_STOP);
AnnaBridge 188:bcfe06ba3d64 56 // Mask All interrupts
AnnaBridge 188:bcfe06ba3d64 57 TMRB_SetINTMask(TSB_TB0, TMRB_MASK_MATCH_LEADING_INT | TMRB_MASK_MATCH_TRAILING_INT | TMRB_MASK_OVERFLOW_INT);
AnnaBridge 184:08ed48f1de7f 58 TMRB_Init(TSB_TB0, &m_tmrb0);
AnnaBridge 184:08ed48f1de7f 59 // Enable TMRB when system is in idle mode
AnnaBridge 184:08ed48f1de7f 60 TMRB_SetIdleMode(TSB_TB0, ENABLE);
AnnaBridge 184:08ed48f1de7f 61 // Starts TSB_TB0
AnnaBridge 184:08ed48f1de7f 62 TMRB_SetRunState(TSB_TB0, TMRB_RUN);
AnnaBridge 188:bcfe06ba3d64 63 NVIC_SetVector(INTTB0_IRQn, (uint32_t)us_ticker_irq_handler);
AnnaBridge 184:08ed48f1de7f 64 }
AnnaBridge 184:08ed48f1de7f 65
AnnaBridge 184:08ed48f1de7f 66 uint32_t us_ticker_read(void)
AnnaBridge 184:08ed48f1de7f 67 {
AnnaBridge 184:08ed48f1de7f 68 uint32_t ret_val = 0;
AnnaBridge 184:08ed48f1de7f 69
AnnaBridge 184:08ed48f1de7f 70 if (!us_ticker_inited) {
AnnaBridge 184:08ed48f1de7f 71 us_ticker_init();
AnnaBridge 184:08ed48f1de7f 72 }
AnnaBridge 184:08ed48f1de7f 73
AnnaBridge 184:08ed48f1de7f 74 ret_val = (uint32_t)TMRB_GetUpCntValue(TSB_TB0);
AnnaBridge 184:08ed48f1de7f 75
AnnaBridge 184:08ed48f1de7f 76 return ret_val;
AnnaBridge 184:08ed48f1de7f 77 }
AnnaBridge 184:08ed48f1de7f 78
AnnaBridge 184:08ed48f1de7f 79 void us_ticker_set_interrupt(timestamp_t timestamp)
AnnaBridge 184:08ed48f1de7f 80 {
AnnaBridge 188:bcfe06ba3d64 81 NVIC_DisableIRQ(INTTB0_IRQn);
AnnaBridge 188:bcfe06ba3d64 82 NVIC_ClearPendingIRQ(INTTB0_IRQn);
AnnaBridge 188:bcfe06ba3d64 83 TMRB_ChangeTrailingTiming(TSB_TB0, timestamp);
AnnaBridge 188:bcfe06ba3d64 84 // Mask all Interrupts except trailing edge interrupt
AnnaBridge 188:bcfe06ba3d64 85 TMRB_SetINTMask(TSB_TB0, TMRB_MASK_MATCH_LEADING_INT | TMRB_MASK_OVERFLOW_INT);
AnnaBridge 188:bcfe06ba3d64 86 NVIC_EnableIRQ(INTTB0_IRQn);
AnnaBridge 184:08ed48f1de7f 87 }
AnnaBridge 184:08ed48f1de7f 88
AnnaBridge 184:08ed48f1de7f 89 void us_ticker_fire_interrupt(void)
AnnaBridge 184:08ed48f1de7f 90 {
AnnaBridge 188:bcfe06ba3d64 91 NVIC_SetPendingIRQ(INTTB0_IRQn);
AnnaBridge 188:bcfe06ba3d64 92 NVIC_EnableIRQ(INTTB0_IRQn);
AnnaBridge 184:08ed48f1de7f 93 }
AnnaBridge 184:08ed48f1de7f 94
AnnaBridge 184:08ed48f1de7f 95 void us_ticker_disable_interrupt(void)
AnnaBridge 184:08ed48f1de7f 96 {
AnnaBridge 188:bcfe06ba3d64 97 // Mask All interrupts
AnnaBridge 188:bcfe06ba3d64 98 TMRB_SetINTMask(TSB_TB0, TMRB_MASK_MATCH_LEADING_INT | TMRB_MASK_MATCH_TRAILING_INT | TMRB_MASK_OVERFLOW_INT);
AnnaBridge 188:bcfe06ba3d64 99 // Also clear and disable interrupts by NVIC
AnnaBridge 188:bcfe06ba3d64 100 NVIC_ClearPendingIRQ(INTTB0_IRQn);
AnnaBridge 188:bcfe06ba3d64 101 NVIC_DisableIRQ(INTTB0_IRQn);
AnnaBridge 184:08ed48f1de7f 102 }
AnnaBridge 184:08ed48f1de7f 103
AnnaBridge 184:08ed48f1de7f 104 void us_ticker_clear_interrupt(void)
AnnaBridge 184:08ed48f1de7f 105 {
AnnaBridge 188:bcfe06ba3d64 106 NVIC_ClearPendingIRQ(INTTB0_IRQn);
AnnaBridge 184:08ed48f1de7f 107 }
AnnaBridge 188:bcfe06ba3d64 108
AnnaBridge 188:bcfe06ba3d64 109 void us_ticker_free(void)
AnnaBridge 188:bcfe06ba3d64 110 {
AnnaBridge 188:bcfe06ba3d64 111 TMRB_SetINTMask(TSB_TB0, TMRB_MASK_MATCH_LEADING_INT | TMRB_MASK_MATCH_TRAILING_INT | TMRB_MASK_OVERFLOW_INT);
AnnaBridge 188:bcfe06ba3d64 112 NVIC_ClearPendingIRQ(INTTB0_IRQn);
AnnaBridge 188:bcfe06ba3d64 113 NVIC_DisableIRQ(INTTB0_IRQn);
AnnaBridge 188:bcfe06ba3d64 114 TMRB_SetRunState(TSB_TB0, TMRB_STOP);
AnnaBridge 188:bcfe06ba3d64 115 TMRB_Disable(TSB_TB0);
AnnaBridge 188:bcfe06ba3d64 116 us_ticker_inited = false;
AnnaBridge 188:bcfe06ba3d64 117 }