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Dependents:   STM32_F103-C8T6basecanblink_led

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targets/TARGET_NUVOTON/TARGET_NANO100/us_ticker.c@183:a56a73fd2a6f, 2018-03-20 (annotated)

Committer:
AnnaBridge
Date:
Tue Mar 20 16:56:18 2018 +0000
Revision:
183:a56a73fd2a6f
Parent:
174:b96e65c34a4d
Child:
185:08ed48f1de7f
mbed-dev library. Release version 160

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AnnaBridge 174:b96e65c34a4d 1 /* mbed Microcontroller Library
AnnaBridge 174:b96e65c34a4d 2 * Copyright (c) 2015-2017 Nuvoton
AnnaBridge 174:b96e65c34a4d 3 *
AnnaBridge 174:b96e65c34a4d 4 * Licensed under the Apache License, Version 2.0 (the "License");
AnnaBridge 174:b96e65c34a4d 5 * you may not use this file except in compliance with the License.
AnnaBridge 174:b96e65c34a4d 6 * You may obtain a copy of the License at
AnnaBridge 174:b96e65c34a4d 7 *
AnnaBridge 174:b96e65c34a4d 8 * http://www.apache.org/licenses/LICENSE-2.0
AnnaBridge 174:b96e65c34a4d 9 *
AnnaBridge 174:b96e65c34a4d 10 * Unless required by applicable law or agreed to in writing, software
AnnaBridge 174:b96e65c34a4d 11 * distributed under the License is distributed on an "AS IS" BASIS,
AnnaBridge 174:b96e65c34a4d 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
AnnaBridge 174:b96e65c34a4d 13 * See the License for the specific language governing permissions and
AnnaBridge 174:b96e65c34a4d 14 * limitations under the License.
AnnaBridge 174:b96e65c34a4d 15 */
AnnaBridge 183:a56a73fd2a6f 16
AnnaBridge 174:b96e65c34a4d 17 #include "us_ticker_api.h"
AnnaBridge 174:b96e65c34a4d 18 #include "sleep_api.h"
AnnaBridge 174:b96e65c34a4d 19 #include "mbed_assert.h"
AnnaBridge 174:b96e65c34a4d 20 #include "nu_modutil.h"
AnnaBridge 174:b96e65c34a4d 21 #include "nu_miscutil.h"
AnnaBridge 174:b96e65c34a4d 22
AnnaBridge 183:a56a73fd2a6f 23 /* Micro seconds per second */
AnnaBridge 183:a56a73fd2a6f 24 #define NU_US_PER_SEC 1000000
AnnaBridge 183:a56a73fd2a6f 25 /* Timer clock per us_ticker tick */
AnnaBridge 183:a56a73fd2a6f 26 #define NU_TMRCLK_PER_TICK 1
AnnaBridge 183:a56a73fd2a6f 27 /* Timer clock per second */
AnnaBridge 183:a56a73fd2a6f 28 #define NU_TMRCLK_PER_SEC (1000 * 1000)
AnnaBridge 183:a56a73fd2a6f 29 /* Timer max counter bit size */
AnnaBridge 183:a56a73fd2a6f 30 #define NU_TMR_MAXCNT_BITSIZE 24
AnnaBridge 183:a56a73fd2a6f 31 /* Timer max counter */
AnnaBridge 183:a56a73fd2a6f 32 #define NU_TMR_MAXCNT ((1 << NU_TMR_MAXCNT_BITSIZE) - 1)
AnnaBridge 174:b96e65c34a4d 33
AnnaBridge 183:a56a73fd2a6f 34 /* NOTE: Don't add static modifier here. These IRQ handler symbols are for linking.
AnnaBridge 183:a56a73fd2a6f 35 Vector table relocation is not actually supported for low-resource target. */
AnnaBridge 183:a56a73fd2a6f 36 void TMR0_IRQHandler(void);
AnnaBridge 174:b96e65c34a4d 37
AnnaBridge 183:a56a73fd2a6f 38 static const struct nu_modinit_s timer0_modinit = {TIMER_0, TMR0_MODULE, CLK_CLKSEL1_TMR0_S_HXT, 0, TMR0_RST, TMR0_IRQn, (void *) TMR0_IRQHandler};
AnnaBridge 183:a56a73fd2a6f 39
AnnaBridge 183:a56a73fd2a6f 40 #define TIMER_MODINIT timer0_modinit
AnnaBridge 183:a56a73fd2a6f 41
AnnaBridge 183:a56a73fd2a6f 42 static int ticker_inited = 0;
AnnaBridge 174:b96e65c34a4d 43
AnnaBridge 174:b96e65c34a4d 44 #define TMR_CMP_MIN 2
AnnaBridge 174:b96e65c34a4d 45 #define TMR_CMP_MAX 0xFFFFFFu
AnnaBridge 174:b96e65c34a4d 46
AnnaBridge 174:b96e65c34a4d 47 void us_ticker_init(void)
AnnaBridge 174:b96e65c34a4d 48 {
AnnaBridge 183:a56a73fd2a6f 49 if (ticker_inited) {
AnnaBridge 174:b96e65c34a4d 50 return;
AnnaBridge 174:b96e65c34a4d 51 }
AnnaBridge 183:a56a73fd2a6f 52 ticker_inited = 1;
AnnaBridge 183:a56a73fd2a6f 53
AnnaBridge 174:b96e65c34a4d 54 // Reset IP
AnnaBridge 183:a56a73fd2a6f 55 SYS_ResetModule(TIMER_MODINIT.rsetidx);
AnnaBridge 183:a56a73fd2a6f 56
AnnaBridge 174:b96e65c34a4d 57 // Select IP clock source
AnnaBridge 183:a56a73fd2a6f 58 CLK_SetModuleClock(TIMER_MODINIT.clkidx, TIMER_MODINIT.clksrc, TIMER_MODINIT.clkdiv);
AnnaBridge 183:a56a73fd2a6f 59
AnnaBridge 174:b96e65c34a4d 60 // Enable IP clock
AnnaBridge 183:a56a73fd2a6f 61 CLK_EnableModuleClock(TIMER_MODINIT.clkidx);
AnnaBridge 174:b96e65c34a4d 62
AnnaBridge 174:b96e65c34a4d 63 // Timer for normal counter
AnnaBridge 183:a56a73fd2a6f 64 uint32_t clk_timer = TIMER_GetModuleClock((TIMER_T *) NU_MODBASE(TIMER_MODINIT.modname));
AnnaBridge 183:a56a73fd2a6f 65 uint32_t prescale_timer = clk_timer / NU_TMRCLK_PER_SEC - 1;
AnnaBridge 183:a56a73fd2a6f 66 MBED_ASSERT((prescale_timer != (uint32_t) -1) && prescale_timer <= 127);
AnnaBridge 183:a56a73fd2a6f 67 MBED_ASSERT((clk_timer % NU_TMRCLK_PER_SEC) == 0);
AnnaBridge 183:a56a73fd2a6f 68 uint32_t cmp_timer = TMR_CMP_MAX;
AnnaBridge 183:a56a73fd2a6f 69 MBED_ASSERT(cmp_timer >= TMR_CMP_MIN && cmp_timer <= TMR_CMP_MAX);
AnnaBridge 183:a56a73fd2a6f 70 ((TIMER_T *) NU_MODBASE(TIMER_MODINIT.modname))->CTL = TIMER_CONTINUOUS_MODE;
AnnaBridge 183:a56a73fd2a6f 71 ((TIMER_T *) NU_MODBASE(TIMER_MODINIT.modname))->PRECNT = prescale_timer;
AnnaBridge 183:a56a73fd2a6f 72 ((TIMER_T *) NU_MODBASE(TIMER_MODINIT.modname))->CMPR = cmp_timer;
AnnaBridge 183:a56a73fd2a6f 73
AnnaBridge 183:a56a73fd2a6f 74 NVIC_SetVector(TIMER_MODINIT.irq_n, (uint32_t) TIMER_MODINIT.var);
AnnaBridge 183:a56a73fd2a6f 75
AnnaBridge 183:a56a73fd2a6f 76 NVIC_EnableIRQ(TIMER_MODINIT.irq_n);
AnnaBridge 183:a56a73fd2a6f 77
AnnaBridge 183:a56a73fd2a6f 78 TIMER_EnableInt((TIMER_T *) NU_MODBASE(TIMER_MODINIT.modname));
AnnaBridge 183:a56a73fd2a6f 79 TIMER_Start((TIMER_T *) NU_MODBASE(TIMER_MODINIT.modname));
AnnaBridge 174:b96e65c34a4d 80 }
AnnaBridge 174:b96e65c34a4d 81
AnnaBridge 174:b96e65c34a4d 82 uint32_t us_ticker_read()
AnnaBridge 174:b96e65c34a4d 83 {
AnnaBridge 183:a56a73fd2a6f 84 if (! ticker_inited) {
AnnaBridge 174:b96e65c34a4d 85 us_ticker_init();
AnnaBridge 174:b96e65c34a4d 86 }
AnnaBridge 174:b96e65c34a4d 87
AnnaBridge 183:a56a73fd2a6f 88 TIMER_T * timer_base = (TIMER_T *) NU_MODBASE(TIMER_MODINIT.modname);
AnnaBridge 174:b96e65c34a4d 89
AnnaBridge 183:a56a73fd2a6f 90 return (TIMER_GetCounter(timer_base) / NU_TMRCLK_PER_TICK);
AnnaBridge 174:b96e65c34a4d 91 }
AnnaBridge 174:b96e65c34a4d 92
AnnaBridge 174:b96e65c34a4d 93 void us_ticker_set_interrupt(timestamp_t timestamp)
AnnaBridge 174:b96e65c34a4d 94 {
AnnaBridge 183:a56a73fd2a6f 95 /* In continuous mode, counter will be reset to zero with the following sequence:
AnnaBridge 183:a56a73fd2a6f 96 * 1. Stop counting
AnnaBridge 183:a56a73fd2a6f 97 * 2. Configure new CMP value
AnnaBridge 183:a56a73fd2a6f 98 * 3. Restart counting
AnnaBridge 183:a56a73fd2a6f 99 *
AnnaBridge 183:a56a73fd2a6f 100 * This behavior is not what we want. To fix it, we could configure new CMP value
AnnaBridge 183:a56a73fd2a6f 101 * without stopping counting first.
AnnaBridge 183:a56a73fd2a6f 102 */
AnnaBridge 183:a56a73fd2a6f 103 TIMER_T * timer_base = (TIMER_T *) NU_MODBASE(TIMER_MODINIT.modname);
AnnaBridge 183:a56a73fd2a6f 104
AnnaBridge 183:a56a73fd2a6f 105 /* NOTE: Because H/W timer requests min compare value, our implementation would have alarm delay of
AnnaBridge 183:a56a73fd2a6f 106 * (TMR_CMP_MIN - interval_clk) clocks when interval_clk is between [1, TMR_CMP_MIN). */
AnnaBridge 183:a56a73fd2a6f 107 uint32_t cmp_timer = timestamp * NU_TMRCLK_PER_TICK;
AnnaBridge 183:a56a73fd2a6f 108 cmp_timer = NU_CLAMP(cmp_timer, TMR_CMP_MIN, TMR_CMP_MAX);
AnnaBridge 183:a56a73fd2a6f 109 timer_base->CMPR = cmp_timer;
AnnaBridge 183:a56a73fd2a6f 110 }
AnnaBridge 183:a56a73fd2a6f 111
AnnaBridge 183:a56a73fd2a6f 112 void us_ticker_disable_interrupt(void)
AnnaBridge 183:a56a73fd2a6f 113 {
AnnaBridge 183:a56a73fd2a6f 114 TIMER_DisableInt((TIMER_T *) NU_MODBASE(TIMER_MODINIT.modname));
AnnaBridge 183:a56a73fd2a6f 115 }
AnnaBridge 183:a56a73fd2a6f 116
AnnaBridge 183:a56a73fd2a6f 117 void us_ticker_clear_interrupt(void)
AnnaBridge 183:a56a73fd2a6f 118 {
AnnaBridge 183:a56a73fd2a6f 119 TIMER_ClearIntFlag((TIMER_T *) NU_MODBASE(TIMER_MODINIT.modname));
AnnaBridge 174:b96e65c34a4d 120 }
AnnaBridge 174:b96e65c34a4d 121
AnnaBridge 174:b96e65c34a4d 122 void us_ticker_fire_interrupt(void)
AnnaBridge 174:b96e65c34a4d 123 {
AnnaBridge 183:a56a73fd2a6f 124 // NOTE: This event was in the past. Set the interrupt as pending, but don't process it here.
AnnaBridge 183:a56a73fd2a6f 125 // This prevents a recursive loop under heavy load which can lead to a stack overflow.
AnnaBridge 183:a56a73fd2a6f 126 NVIC_SetPendingIRQ(TIMER_MODINIT.irq_n);
AnnaBridge 183:a56a73fd2a6f 127 }
AnnaBridge 183:a56a73fd2a6f 128
AnnaBridge 183:a56a73fd2a6f 129 const ticker_info_t* us_ticker_get_info()
AnnaBridge 183:a56a73fd2a6f 130 {
AnnaBridge 183:a56a73fd2a6f 131 static const ticker_info_t info = {
AnnaBridge 183:a56a73fd2a6f 132 NU_TMRCLK_PER_SEC / NU_TMRCLK_PER_TICK,
AnnaBridge 183:a56a73fd2a6f 133 NU_TMR_MAXCNT_BITSIZE
AnnaBridge 183:a56a73fd2a6f 134 };
AnnaBridge 183:a56a73fd2a6f 135 return &info;
AnnaBridge 174:b96e65c34a4d 136 }
AnnaBridge 174:b96e65c34a4d 137
AnnaBridge 174:b96e65c34a4d 138 void TMR0_IRQHandler(void)
AnnaBridge 174:b96e65c34a4d 139 {
AnnaBridge 183:a56a73fd2a6f 140 TIMER_ClearIntFlag((TIMER_T *) NU_MODBASE(TIMER_MODINIT.modname));
AnnaBridge 174:b96e65c34a4d 141
AnnaBridge 183:a56a73fd2a6f 142 // NOTE: us_ticker_set_interrupt() may get called in us_ticker_irq_handler();
AnnaBridge 183:a56a73fd2a6f 143 us_ticker_irq_handler();
AnnaBridge 174:b96e65c34a4d 144 }