Gordon Craig / mbed-dev

Forked.

Fork of mbed-dev by mbed official

targets/TARGET_TOSHIBA/TARGET_TMPM066/us_ticker.c@174:ed647f63e28d, 2017-12-19 (annotated)

Committer:
Dollyparton
Date:
Tue Dec 19 12:50:13 2017 +0000
Revision:
174:ed647f63e28d
Parent:
172:7d866c31b3c5 
Added RAW socket.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AnnaBridge 172:7d866c31b3c5 1 /* mbed Microcontroller Library
AnnaBridge 172:7d866c31b3c5 2 * (C)Copyright TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION 2017 All rights reserved
AnnaBridge 172:7d866c31b3c5 3 *
AnnaBridge 172:7d866c31b3c5 4 * Licensed under the Apache License, Version 2.0 (the "License");
AnnaBridge 172:7d866c31b3c5 5 * you may not use this file except in compliance with the License.
AnnaBridge 172:7d866c31b3c5 6 * You may obtain a copy of the License at
AnnaBridge 172:7d866c31b3c5 7 *
AnnaBridge 172:7d866c31b3c5 8 * http://www.apache.org/licenses/LICENSE-2.0
AnnaBridge 172:7d866c31b3c5 9 *
AnnaBridge 172:7d866c31b3c5 10 * Unless required by applicable law or agreed to in writing, software
AnnaBridge 172:7d866c31b3c5 11 * distributed under the License is distributed on an "AS IS" BASIS,
AnnaBridge 172:7d866c31b3c5 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
AnnaBridge 172:7d866c31b3c5 13 * See the License for the specific language governing permissions and
AnnaBridge 172:7d866c31b3c5 14 * limitations under the License.
AnnaBridge 172:7d866c31b3c5 15 */
AnnaBridge 172:7d866c31b3c5 16 #include "us_ticker_api.h"
AnnaBridge 172:7d866c31b3c5 17 #include "mbed_critical.h"
AnnaBridge 172:7d866c31b3c5 18
AnnaBridge 172:7d866c31b3c5 19 #define TMR16A_100US 0x960 // fsys = fc = 24MHz, Ttmra = 1/24us, 100us*24us = 2400 = 0x960
AnnaBridge 172:7d866c31b3c5 20 #define TMR16A_SYSCK ((uint32_t)0x00000001)
AnnaBridge 172:7d866c31b3c5 21 #define TMR16A_RUN ((uint32_t)0x00000001)
AnnaBridge 172:7d866c31b3c5 22 #define TMR16A_STOP ((uint32_t)0x00000000)
AnnaBridge 172:7d866c31b3c5 23 #define OVERFLOW_32BIT (0xFFFFFFFF / 0x64)
AnnaBridge 172:7d866c31b3c5 24
AnnaBridge 172:7d866c31b3c5 25 static uint8_t us_ticker_inited = 0; // Is ticker initialized yet?
AnnaBridge 172:7d866c31b3c5 26 static volatile uint32_t ticker_int_counter = 0; // Amount of overflows until user interrupt
AnnaBridge 172:7d866c31b3c5 27 static volatile uint32_t us_ticker = 0; // timer counter
AnnaBridge 172:7d866c31b3c5 28
AnnaBridge 172:7d866c31b3c5 29 void INT16A0_IRQHandler(void)
AnnaBridge 172:7d866c31b3c5 30 {
AnnaBridge 172:7d866c31b3c5 31 us_ticker++;
AnnaBridge 172:7d866c31b3c5 32
AnnaBridge 172:7d866c31b3c5 33 if (us_ticker > OVERFLOW_32BIT) {
AnnaBridge 172:7d866c31b3c5 34 us_ticker = 0;
AnnaBridge 172:7d866c31b3c5 35 }
AnnaBridge 172:7d866c31b3c5 36 }
AnnaBridge 172:7d866c31b3c5 37
AnnaBridge 172:7d866c31b3c5 38 void INT16A1_IRQHandler(void)
AnnaBridge 172:7d866c31b3c5 39 {
AnnaBridge 172:7d866c31b3c5 40 us_ticker_irq_handler();
AnnaBridge 172:7d866c31b3c5 41 }
AnnaBridge 172:7d866c31b3c5 42
AnnaBridge 172:7d866c31b3c5 43 // initialize us_ticker
AnnaBridge 172:7d866c31b3c5 44 void us_ticker_init(void)
AnnaBridge 172:7d866c31b3c5 45 {
AnnaBridge 172:7d866c31b3c5 46 // Enable clock supply to TA0
AnnaBridge 172:7d866c31b3c5 47 CG_SetFcPeriphA(CG_FC_PERIPH_TMR16A, ENABLE);
AnnaBridge 172:7d866c31b3c5 48 if (us_ticker_inited) {
AnnaBridge 172:7d866c31b3c5 49 return;
AnnaBridge 172:7d866c31b3c5 50 }
AnnaBridge 172:7d866c31b3c5 51 us_ticker_inited = 1;
AnnaBridge 172:7d866c31b3c5 52
AnnaBridge 172:7d866c31b3c5 53 // Stops and clear count operation
AnnaBridge 172:7d866c31b3c5 54 TSB_T16A0->RUN = TMR16A_STOP;
AnnaBridge 172:7d866c31b3c5 55 TSB_T16A0->CR = TMR16A_SYSCK;
AnnaBridge 172:7d866c31b3c5 56 // Permits INTTA0 interrupt
AnnaBridge 172:7d866c31b3c5 57 NVIC_EnableIRQ(INT16A0_IRQn);
AnnaBridge 172:7d866c31b3c5 58 // Match counter set to max value
AnnaBridge 172:7d866c31b3c5 59 TSB_T16A0->RG = TMR16A_100US;
AnnaBridge 172:7d866c31b3c5 60 TSB_T16A0->RUN = TMR16A_RUN;
AnnaBridge 172:7d866c31b3c5 61 }
AnnaBridge 172:7d866c31b3c5 62
AnnaBridge 172:7d866c31b3c5 63 uint32_t us_ticker_read(void)
AnnaBridge 172:7d866c31b3c5 64 {
AnnaBridge 172:7d866c31b3c5 65 uint32_t ret_val = 0;
AnnaBridge 172:7d866c31b3c5 66
AnnaBridge 172:7d866c31b3c5 67 if (!us_ticker_inited) {
AnnaBridge 172:7d866c31b3c5 68 us_ticker_init();
AnnaBridge 172:7d866c31b3c5 69 }
AnnaBridge 172:7d866c31b3c5 70
AnnaBridge 172:7d866c31b3c5 71 uint32_t tickerbefore = 0;
AnnaBridge 172:7d866c31b3c5 72 do {
AnnaBridge 172:7d866c31b3c5 73 tickerbefore = us_ticker;
AnnaBridge 172:7d866c31b3c5 74 ret_val = (us_ticker * 100);
AnnaBridge 172:7d866c31b3c5 75 } while (tickerbefore != us_ticker);
AnnaBridge 172:7d866c31b3c5 76
AnnaBridge 172:7d866c31b3c5 77 return ret_val;
AnnaBridge 172:7d866c31b3c5 78 }
AnnaBridge 172:7d866c31b3c5 79
AnnaBridge 172:7d866c31b3c5 80 void us_ticker_set_interrupt(timestamp_t timestamp)
AnnaBridge 172:7d866c31b3c5 81 {
AnnaBridge 172:7d866c31b3c5 82 uint32_t delta = 0;
AnnaBridge 172:7d866c31b3c5 83
AnnaBridge 172:7d866c31b3c5 84 // Stops and clear count operation
AnnaBridge 172:7d866c31b3c5 85 TSB_T16A1->RUN = TMR16A_STOP;
AnnaBridge 172:7d866c31b3c5 86 TSB_T16A1->CR = TMR16A_SYSCK;
AnnaBridge 172:7d866c31b3c5 87 // Set the compare register
AnnaBridge 172:7d866c31b3c5 88 delta = (timestamp - us_ticker_read());
AnnaBridge 172:7d866c31b3c5 89 TSB_T16A1->RG = delta;
AnnaBridge 172:7d866c31b3c5 90 // Set Interrupt
AnnaBridge 172:7d866c31b3c5 91 NVIC_EnableIRQ(INT16A1_IRQn);
AnnaBridge 172:7d866c31b3c5 92 // Start TMR_TA1 timer
AnnaBridge 172:7d866c31b3c5 93 TSB_T16A1->RUN = TMR16A_RUN;
AnnaBridge 172:7d866c31b3c5 94 }
AnnaBridge 172:7d866c31b3c5 95
AnnaBridge 172:7d866c31b3c5 96 void us_ticker_fire_interrupt(void)
AnnaBridge 172:7d866c31b3c5 97 {
AnnaBridge 172:7d866c31b3c5 98 NVIC_SetPendingIRQ(INT16A1_IRQn);
AnnaBridge 172:7d866c31b3c5 99 }
AnnaBridge 172:7d866c31b3c5 100
AnnaBridge 172:7d866c31b3c5 101 void us_ticker_disable_interrupt(void)
AnnaBridge 172:7d866c31b3c5 102 {
AnnaBridge 172:7d866c31b3c5 103 NVIC_DisableIRQ(INT16A1_IRQn);
AnnaBridge 172:7d866c31b3c5 104 }
AnnaBridge 172:7d866c31b3c5 105
AnnaBridge 172:7d866c31b3c5 106 void us_ticker_clear_interrupt(void)
AnnaBridge 172:7d866c31b3c5 107 {
AnnaBridge 172:7d866c31b3c5 108 //no flags to clear
AnnaBridge 172:7d866c31b3c5 109 }