MacroRat / MouseCode

Mouse code for the MacroRat

Dependencies:   ITG3200 QEI

mbed-dev/targets/TARGET_NUVOTON/TARGET_NUC472/us_ticker.c@46:b156ef445742, 2017-06-03 (annotated)

Committer:
sahilmgandhi
Date:
Sat Jun 03 00:22:44 2017 +0000
Revision:
46:b156ef445742
Parent:
18:6a4db94011d3 
Final code for internal battlebot competition.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
sahilmgandhi 18:6a4db94011d3 1 /* mbed Microcontroller Library
sahilmgandhi 18:6a4db94011d3 2 * Copyright (c) 2015-2016 Nuvoton
sahilmgandhi 18:6a4db94011d3 3 *
sahilmgandhi 18:6a4db94011d3 4 * Licensed under the Apache License, Version 2.0 (the "License");
sahilmgandhi 18:6a4db94011d3 5 * you may not use this file except in compliance with the License.
sahilmgandhi 18:6a4db94011d3 6 * You may obtain a copy of the License at
sahilmgandhi 18:6a4db94011d3 7 *
sahilmgandhi 18:6a4db94011d3 8 * http://www.apache.org/licenses/LICENSE-2.0
sahilmgandhi 18:6a4db94011d3 9 *
sahilmgandhi 18:6a4db94011d3 10 * Unless required by applicable law or agreed to in writing, software
sahilmgandhi 18:6a4db94011d3 11 * distributed under the License is distributed on an "AS IS" BASIS,
sahilmgandhi 18:6a4db94011d3 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
sahilmgandhi 18:6a4db94011d3 13 * See the License for the specific language governing permissions and
sahilmgandhi 18:6a4db94011d3 14 * limitations under the License.
sahilmgandhi 18:6a4db94011d3 15 */
sahilmgandhi 18:6a4db94011d3 16
sahilmgandhi 18:6a4db94011d3 17 #include "us_ticker_api.h"
sahilmgandhi 18:6a4db94011d3 18 #include "sleep_api.h"
sahilmgandhi 18:6a4db94011d3 19 #include "mbed_assert.h"
sahilmgandhi 18:6a4db94011d3 20 #include "nu_modutil.h"
sahilmgandhi 18:6a4db94011d3 21 #include "nu_miscutil.h"
sahilmgandhi 18:6a4db94011d3 22 #include "mbed_critical.h"
sahilmgandhi 18:6a4db94011d3 23
sahilmgandhi 18:6a4db94011d3 24 // us_ticker tick = us = timestamp
sahilmgandhi 18:6a4db94011d3 25 #define US_PER_TICK 1
sahilmgandhi 18:6a4db94011d3 26 #define US_PER_SEC (1000 * 1000)
sahilmgandhi 18:6a4db94011d3 27
sahilmgandhi 18:6a4db94011d3 28 #define TMR0HIRES_CLK_PER_SEC (1000 * 1000)
sahilmgandhi 18:6a4db94011d3 29 #define TMR1HIRES_CLK_PER_SEC (1000 * 1000)
sahilmgandhi 18:6a4db94011d3 30
sahilmgandhi 18:6a4db94011d3 31 #define US_PER_TMR0HIRES_CLK (US_PER_SEC / TMR0HIRES_CLK_PER_SEC)
sahilmgandhi 18:6a4db94011d3 32 #define US_PER_TMR1HIRES_CLK (US_PER_SEC / TMR1HIRES_CLK_PER_SEC)
sahilmgandhi 18:6a4db94011d3 33
sahilmgandhi 18:6a4db94011d3 34 #define US_PER_TMR0HIRES_INT (1000 * 1000 * 10)
sahilmgandhi 18:6a4db94011d3 35 #define TMR0HIRES_CLK_PER_TMR0HIRES_INT ((uint32_t) ((uint64_t) US_PER_TMR0HIRES_INT * TMR0HIRES_CLK_PER_SEC / US_PER_SEC))
sahilmgandhi 18:6a4db94011d3 36
sahilmgandhi 18:6a4db94011d3 37
sahilmgandhi 18:6a4db94011d3 38 static void tmr0_vec(void);
sahilmgandhi 18:6a4db94011d3 39 static void tmr1_vec(void);
sahilmgandhi 18:6a4db94011d3 40 static void us_ticker_arm_cd(void);
sahilmgandhi 18:6a4db94011d3 41
sahilmgandhi 18:6a4db94011d3 42 static int us_ticker_inited = 0;
sahilmgandhi 18:6a4db94011d3 43 static volatile uint32_t counter_major = 0;
sahilmgandhi 18:6a4db94011d3 44 static volatile uint32_t cd_major_minor_us = 0;
sahilmgandhi 18:6a4db94011d3 45 static volatile uint32_t cd_minor_us = 0;
sahilmgandhi 18:6a4db94011d3 46
sahilmgandhi 18:6a4db94011d3 47 // NOTE: PCLK is set up in mbed_sdk_init(), invocation of which must be before C++ global object constructor. See init_api.c for details.
sahilmgandhi 18:6a4db94011d3 48 // NOTE: Choose clock source of timer:
sahilmgandhi 18:6a4db94011d3 49 // 1. HIRC: Be the most accurate but might cause unknown HardFault.
sahilmgandhi 18:6a4db94011d3 50 // 2. HXT: Less accurate and cannot pass mbed-drivers test.
sahilmgandhi 18:6a4db94011d3 51 // 3. PCLK(HXT): Less accurate but can pass mbed-drivers test.
sahilmgandhi 18:6a4db94011d3 52 // NOTE: TIMER_0 for normal counter, TIMER_1 for countdown.
sahilmgandhi 18:6a4db94011d3 53 static const struct nu_modinit_s timer0hires_modinit = {TIMER_0, TMR0_MODULE, CLK_CLKSEL1_TMR0SEL_PCLK, 0, TMR0_RST, TMR0_IRQn, (void *) tmr0_vec};
sahilmgandhi 18:6a4db94011d3 54 static const struct nu_modinit_s timer1hires_modinit = {TIMER_1, TMR1_MODULE, CLK_CLKSEL1_TMR1SEL_PCLK, 0, TMR1_RST, TMR1_IRQn, (void *) tmr1_vec};
sahilmgandhi 18:6a4db94011d3 55
sahilmgandhi 18:6a4db94011d3 56 #define TMR_CMP_MIN 2
sahilmgandhi 18:6a4db94011d3 57 #define TMR_CMP_MAX 0xFFFFFFu
sahilmgandhi 18:6a4db94011d3 58
sahilmgandhi 18:6a4db94011d3 59 void us_ticker_init(void)
sahilmgandhi 18:6a4db94011d3 60 {
sahilmgandhi 18:6a4db94011d3 61 if (us_ticker_inited) {
sahilmgandhi 18:6a4db94011d3 62 return;
sahilmgandhi 18:6a4db94011d3 63 }
sahilmgandhi 18:6a4db94011d3 64
sahilmgandhi 18:6a4db94011d3 65 counter_major = 0;
sahilmgandhi 18:6a4db94011d3 66 cd_major_minor_us = 0;
sahilmgandhi 18:6a4db94011d3 67 cd_minor_us = 0;
sahilmgandhi 18:6a4db94011d3 68 us_ticker_inited = 1;
sahilmgandhi 18:6a4db94011d3 69
sahilmgandhi 18:6a4db94011d3 70 // Reset IP
sahilmgandhi 18:6a4db94011d3 71 SYS_ResetModule(timer0hires_modinit.rsetidx);
sahilmgandhi 18:6a4db94011d3 72 SYS_ResetModule(timer1hires_modinit.rsetidx);
sahilmgandhi 18:6a4db94011d3 73
sahilmgandhi 18:6a4db94011d3 74 // Select IP clock source
sahilmgandhi 18:6a4db94011d3 75 CLK_SetModuleClock(timer0hires_modinit.clkidx, timer0hires_modinit.clksrc, timer0hires_modinit.clkdiv);
sahilmgandhi 18:6a4db94011d3 76 CLK_SetModuleClock(timer1hires_modinit.clkidx, timer1hires_modinit.clksrc, timer1hires_modinit.clkdiv);
sahilmgandhi 18:6a4db94011d3 77 // Enable IP clock
sahilmgandhi 18:6a4db94011d3 78 CLK_EnableModuleClock(timer0hires_modinit.clkidx);
sahilmgandhi 18:6a4db94011d3 79 CLK_EnableModuleClock(timer1hires_modinit.clkidx);
sahilmgandhi 18:6a4db94011d3 80
sahilmgandhi 18:6a4db94011d3 81 // Timer for normal counter
sahilmgandhi 18:6a4db94011d3 82 uint32_t clk_timer0 = TIMER_GetModuleClock((TIMER_T *) NU_MODBASE(timer0hires_modinit.modname));
sahilmgandhi 18:6a4db94011d3 83 uint32_t prescale_timer0 = clk_timer0 / TMR0HIRES_CLK_PER_SEC - 1;
sahilmgandhi 18:6a4db94011d3 84 MBED_ASSERT((prescale_timer0 != (uint32_t) -1) && prescale_timer0 <= 127);
sahilmgandhi 18:6a4db94011d3 85 MBED_ASSERT((clk_timer0 % TMR0HIRES_CLK_PER_SEC) == 0);
sahilmgandhi 18:6a4db94011d3 86 uint32_t cmp_timer0 = TMR0HIRES_CLK_PER_TMR0HIRES_INT;
sahilmgandhi 18:6a4db94011d3 87 MBED_ASSERT(cmp_timer0 >= TMR_CMP_MIN && cmp_timer0 <= TMR_CMP_MAX);
sahilmgandhi 18:6a4db94011d3 88 ((TIMER_T *) NU_MODBASE(timer0hires_modinit.modname))->CTL = TIMER_PERIODIC_MODE | prescale_timer0 | TIMER_CTL_CNTDATEN_Msk;
sahilmgandhi 18:6a4db94011d3 89 ((TIMER_T *) NU_MODBASE(timer0hires_modinit.modname))->CMP = cmp_timer0;
sahilmgandhi 18:6a4db94011d3 90
sahilmgandhi 18:6a4db94011d3 91 NVIC_SetVector(timer0hires_modinit.irq_n, (uint32_t) timer0hires_modinit.var);
sahilmgandhi 18:6a4db94011d3 92 NVIC_SetVector(timer1hires_modinit.irq_n, (uint32_t) timer1hires_modinit.var);
sahilmgandhi 18:6a4db94011d3 93
sahilmgandhi 18:6a4db94011d3 94 NVIC_EnableIRQ(timer0hires_modinit.irq_n);
sahilmgandhi 18:6a4db94011d3 95 NVIC_EnableIRQ(timer1hires_modinit.irq_n);
sahilmgandhi 18:6a4db94011d3 96
sahilmgandhi 18:6a4db94011d3 97 TIMER_EnableInt((TIMER_T *) NU_MODBASE(timer0hires_modinit.modname));
sahilmgandhi 18:6a4db94011d3 98 TIMER_Start((TIMER_T *) NU_MODBASE(timer0hires_modinit.modname));
sahilmgandhi 18:6a4db94011d3 99 }
sahilmgandhi 18:6a4db94011d3 100
sahilmgandhi 18:6a4db94011d3 101 uint32_t us_ticker_read()
sahilmgandhi 18:6a4db94011d3 102 {
sahilmgandhi 18:6a4db94011d3 103 if (! us_ticker_inited) {
sahilmgandhi 18:6a4db94011d3 104 us_ticker_init();
sahilmgandhi 18:6a4db94011d3 105 }
sahilmgandhi 18:6a4db94011d3 106
sahilmgandhi 18:6a4db94011d3 107 TIMER_T * timer0_base = (TIMER_T *) NU_MODBASE(timer0hires_modinit.modname);
sahilmgandhi 18:6a4db94011d3 108
sahilmgandhi 18:6a4db94011d3 109 do {
sahilmgandhi 18:6a4db94011d3 110 uint32_t major_minor_us;
sahilmgandhi 18:6a4db94011d3 111 uint32_t minor_us;
sahilmgandhi 18:6a4db94011d3 112
sahilmgandhi 18:6a4db94011d3 113 // NOTE: As TIMER_CNT = TIMER_CMP and counter_major has increased by one, TIMER_CNT doesn't change to 0 for one tick time.
sahilmgandhi 18:6a4db94011d3 114 // NOTE: As TIMER_CNT = TIMER_CMP or TIMER_CNT = 0, counter_major (ISR) may not sync with TIMER_CNT. So skip and fetch stable one at the cost of 1 clock delay on this read.
sahilmgandhi 18:6a4db94011d3 115 do {
sahilmgandhi 18:6a4db94011d3 116 core_util_critical_section_enter();
sahilmgandhi 18:6a4db94011d3 117
sahilmgandhi 18:6a4db94011d3 118 // NOTE: Order of reading minor_us/carry here is significant.
sahilmgandhi 18:6a4db94011d3 119 minor_us = TIMER_GetCounter(timer0_base) * US_PER_TMR0HIRES_CLK;
sahilmgandhi 18:6a4db94011d3 120 uint32_t carry = (timer0_base->INTSTS & TIMER_INTSTS_TIF_Msk) ? 1 : 0;
sahilmgandhi 18:6a4db94011d3 121 // When TIMER_CNT approaches TIMER_CMP and will wrap soon, we may get carry but TIMER_CNT not wrapped. Hanlde carefully carry == 1 && TIMER_CNT is near TIMER_CMP.
sahilmgandhi 18:6a4db94011d3 122 if (carry && minor_us > (US_PER_TMR0HIRES_INT / 2)) {
sahilmgandhi 18:6a4db94011d3 123 major_minor_us = (counter_major + 1) * US_PER_TMR0HIRES_INT;
sahilmgandhi 18:6a4db94011d3 124 }
sahilmgandhi 18:6a4db94011d3 125 else {
sahilmgandhi 18:6a4db94011d3 126 major_minor_us = (counter_major + carry) * US_PER_TMR0HIRES_INT + minor_us;
sahilmgandhi 18:6a4db94011d3 127 }
sahilmgandhi 18:6a4db94011d3 128
sahilmgandhi 18:6a4db94011d3 129 core_util_critical_section_exit();
sahilmgandhi 18:6a4db94011d3 130 }
sahilmgandhi 18:6a4db94011d3 131 while (minor_us == 0 || minor_us == US_PER_TMR0HIRES_INT);
sahilmgandhi 18:6a4db94011d3 132
sahilmgandhi 18:6a4db94011d3 133 return (major_minor_us / US_PER_TICK);
sahilmgandhi 18:6a4db94011d3 134 }
sahilmgandhi 18:6a4db94011d3 135 while (0);
sahilmgandhi 18:6a4db94011d3 136 }
sahilmgandhi 18:6a4db94011d3 137
sahilmgandhi 18:6a4db94011d3 138 void us_ticker_disable_interrupt(void)
sahilmgandhi 18:6a4db94011d3 139 {
sahilmgandhi 18:6a4db94011d3 140 TIMER_DisableInt((TIMER_T *) NU_MODBASE(timer1hires_modinit.modname));
sahilmgandhi 18:6a4db94011d3 141 }
sahilmgandhi 18:6a4db94011d3 142
sahilmgandhi 18:6a4db94011d3 143 void us_ticker_clear_interrupt(void)
sahilmgandhi 18:6a4db94011d3 144 {
sahilmgandhi 18:6a4db94011d3 145 TIMER_ClearIntFlag((TIMER_T *) NU_MODBASE(timer1hires_modinit.modname));
sahilmgandhi 18:6a4db94011d3 146 }
sahilmgandhi 18:6a4db94011d3 147
sahilmgandhi 18:6a4db94011d3 148 void us_ticker_set_interrupt(timestamp_t timestamp)
sahilmgandhi 18:6a4db94011d3 149 {
sahilmgandhi 18:6a4db94011d3 150 TIMER_Stop((TIMER_T *) NU_MODBASE(timer1hires_modinit.modname));
sahilmgandhi 18:6a4db94011d3 151
sahilmgandhi 18:6a4db94011d3 152 int delta = (int) (timestamp - us_ticker_read());
sahilmgandhi 18:6a4db94011d3 153 if (delta > 0) {
sahilmgandhi 18:6a4db94011d3 154 cd_major_minor_us = delta * US_PER_TICK;
sahilmgandhi 18:6a4db94011d3 155 us_ticker_arm_cd();
sahilmgandhi 18:6a4db94011d3 156 }
sahilmgandhi 18:6a4db94011d3 157 else {
sahilmgandhi 18:6a4db94011d3 158 cd_major_minor_us = cd_minor_us = 0;
sahilmgandhi 18:6a4db94011d3 159 /**
sahilmgandhi 18:6a4db94011d3 160 * This event was in the past. Set the interrupt as pending, but don't process it here.
sahilmgandhi 18:6a4db94011d3 161 * This prevents a recurive loop under heavy load which can lead to a stack overflow.
sahilmgandhi 18:6a4db94011d3 162 */
sahilmgandhi 18:6a4db94011d3 163 NVIC_SetPendingIRQ(timer1hires_modinit.irq_n);
sahilmgandhi 18:6a4db94011d3 164 }
sahilmgandhi 18:6a4db94011d3 165 }
sahilmgandhi 18:6a4db94011d3 166
sahilmgandhi 18:6a4db94011d3 167 static void tmr0_vec(void)
sahilmgandhi 18:6a4db94011d3 168 {
sahilmgandhi 18:6a4db94011d3 169 TIMER_ClearIntFlag((TIMER_T *) NU_MODBASE(timer0hires_modinit.modname));
sahilmgandhi 18:6a4db94011d3 170 counter_major ++;
sahilmgandhi 18:6a4db94011d3 171 }
sahilmgandhi 18:6a4db94011d3 172
sahilmgandhi 18:6a4db94011d3 173 static void tmr1_vec(void)
sahilmgandhi 18:6a4db94011d3 174 {
sahilmgandhi 18:6a4db94011d3 175 TIMER_ClearIntFlag((TIMER_T *) NU_MODBASE(timer1hires_modinit.modname));
sahilmgandhi 18:6a4db94011d3 176 cd_major_minor_us = (cd_major_minor_us > cd_minor_us) ? (cd_major_minor_us - cd_minor_us) : 0;
sahilmgandhi 18:6a4db94011d3 177 if (cd_major_minor_us == 0) {
sahilmgandhi 18:6a4db94011d3 178 // NOTE: us_ticker_set_interrupt() may get called in us_ticker_irq_handler();
sahilmgandhi 18:6a4db94011d3 179 us_ticker_irq_handler();
sahilmgandhi 18:6a4db94011d3 180 }
sahilmgandhi 18:6a4db94011d3 181 else {
sahilmgandhi 18:6a4db94011d3 182 us_ticker_arm_cd();
sahilmgandhi 18:6a4db94011d3 183 }
sahilmgandhi 18:6a4db94011d3 184 }
sahilmgandhi 18:6a4db94011d3 185
sahilmgandhi 18:6a4db94011d3 186 static void us_ticker_arm_cd(void)
sahilmgandhi 18:6a4db94011d3 187 {
sahilmgandhi 18:6a4db94011d3 188 TIMER_T * timer1_base = (TIMER_T *) NU_MODBASE(timer1hires_modinit.modname);
sahilmgandhi 18:6a4db94011d3 189
sahilmgandhi 18:6a4db94011d3 190 cd_minor_us = cd_major_minor_us;
sahilmgandhi 18:6a4db94011d3 191
sahilmgandhi 18:6a4db94011d3 192 // Reset 8-bit PSC counter, 24-bit up counter value and CNTEN bit
sahilmgandhi 18:6a4db94011d3 193 timer1_base->CTL |= TIMER_CTL_RSTCNT_Msk;
sahilmgandhi 18:6a4db94011d3 194 // One-shot mode, Clock = 1 MHz
sahilmgandhi 18:6a4db94011d3 195 uint32_t clk_timer1 = TIMER_GetModuleClock((TIMER_T *) NU_MODBASE(timer1hires_modinit.modname));
sahilmgandhi 18:6a4db94011d3 196 uint32_t prescale_timer1 = clk_timer1 / TMR1HIRES_CLK_PER_SEC - 1;
sahilmgandhi 18:6a4db94011d3 197 MBED_ASSERT((prescale_timer1 != (uint32_t) -1) && prescale_timer1 <= 127);
sahilmgandhi 18:6a4db94011d3 198 MBED_ASSERT((clk_timer1 % TMR1HIRES_CLK_PER_SEC) == 0);
sahilmgandhi 18:6a4db94011d3 199 timer1_base->CTL &= ~(TIMER_CTL_OPMODE_Msk | TIMER_CTL_PSC_Msk | TIMER_CTL_CNTDATEN_Msk);
sahilmgandhi 18:6a4db94011d3 200 timer1_base->CTL |= TIMER_ONESHOT_MODE | prescale_timer1 | TIMER_CTL_CNTDATEN_Msk;
sahilmgandhi 18:6a4db94011d3 201
sahilmgandhi 18:6a4db94011d3 202 uint32_t cmp_timer1 = cd_minor_us / US_PER_TMR1HIRES_CLK;
sahilmgandhi 18:6a4db94011d3 203 cmp_timer1 = NU_CLAMP(cmp_timer1, TMR_CMP_MIN, TMR_CMP_MAX);
sahilmgandhi 18:6a4db94011d3 204 timer1_base->CMP = cmp_timer1;
sahilmgandhi 18:6a4db94011d3 205
sahilmgandhi 18:6a4db94011d3 206 TIMER_EnableInt(timer1_base);
sahilmgandhi 18:6a4db94011d3 207 TIMER_Start(timer1_base);
sahilmgandhi 18:6a4db94011d3 208 }