takashi kadono / Mbed OS Nucleo446_SSD1331

Color Oled(SSD1331) connect to STMicroelectronics Nucleo-F466

Dependencies:   ssd1331

mbed-os/targets/TARGET_Freescale/TARGET_MCUXpresso_MCUS/TARGET_MCU_K64F/us_ticker.c@3:f3764f852aa8, 2018-10-11 (annotated)

Committer:
kadonotakashi
Date:
Thu Oct 11 02:27:46 2018 +0000
Revision:
3:f3764f852aa8
Parent:
0:8fdf9a60065b 
Nucreo 446 + SSD1331 test version;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
kadonotakashi 0:8fdf9a60065b 1 /* mbed Microcontroller Library
kadonotakashi 0:8fdf9a60065b 2 * Copyright (c) 2006-2018 ARM Limited
kadonotakashi 0:8fdf9a60065b 3 *
kadonotakashi 0:8fdf9a60065b 4 * Licensed under the Apache License, Version 2.0 (the "License");
kadonotakashi 0:8fdf9a60065b 5 * you may not use this file except in compliance with the License.
kadonotakashi 0:8fdf9a60065b 6 * You may obtain a copy of the License at
kadonotakashi 0:8fdf9a60065b 7 *
kadonotakashi 0:8fdf9a60065b 8 * http://www.apache.org/licenses/LICENSE-2.0
kadonotakashi 0:8fdf9a60065b 9 *
kadonotakashi 0:8fdf9a60065b 10 * Unless required by applicable law or agreed to in writing, software
kadonotakashi 0:8fdf9a60065b 11 * distributed under the License is distributed on an "AS IS" BASIS,
kadonotakashi 0:8fdf9a60065b 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
kadonotakashi 0:8fdf9a60065b 13 * See the License for the specific language governing permissions and
kadonotakashi 0:8fdf9a60065b 14 * limitations under the License.
kadonotakashi 0:8fdf9a60065b 15 */
kadonotakashi 0:8fdf9a60065b 16 #include <stddef.h>
kadonotakashi 0:8fdf9a60065b 17 #include "us_ticker_api.h"
kadonotakashi 0:8fdf9a60065b 18 #include "PeripheralNames.h"
kadonotakashi 0:8fdf9a60065b 19 #include "fsl_pit.h"
kadonotakashi 0:8fdf9a60065b 20 #include "fsl_clock_config.h"
kadonotakashi 0:8fdf9a60065b 21
kadonotakashi 0:8fdf9a60065b 22 const ticker_info_t* us_ticker_get_info()
kadonotakashi 0:8fdf9a60065b 23 {
kadonotakashi 0:8fdf9a60065b 24 static const ticker_info_t info = {
kadonotakashi 0:8fdf9a60065b 25 1000000, // 1 MHz
kadonotakashi 0:8fdf9a60065b 26 32 // 32 bit counter
kadonotakashi 0:8fdf9a60065b 27 };
kadonotakashi 0:8fdf9a60065b 28 return &info;
kadonotakashi 0:8fdf9a60065b 29 }
kadonotakashi 0:8fdf9a60065b 30
kadonotakashi 0:8fdf9a60065b 31 static bool us_ticker_inited = false;
kadonotakashi 0:8fdf9a60065b 32
kadonotakashi 0:8fdf9a60065b 33 static void pit_isr(void)
kadonotakashi 0:8fdf9a60065b 34 {
kadonotakashi 0:8fdf9a60065b 35 PIT_ClearStatusFlags(PIT, kPIT_Chnl_3, PIT_TFLG_TIF_MASK);
kadonotakashi 0:8fdf9a60065b 36 PIT_ClearStatusFlags(PIT, kPIT_Chnl_2, PIT_TFLG_TIF_MASK);
kadonotakashi 0:8fdf9a60065b 37 PIT_StopTimer(PIT, kPIT_Chnl_2);
kadonotakashi 0:8fdf9a60065b 38 PIT_StopTimer(PIT, kPIT_Chnl_3);
kadonotakashi 0:8fdf9a60065b 39
kadonotakashi 0:8fdf9a60065b 40 us_ticker_irq_handler();
kadonotakashi 0:8fdf9a60065b 41 }
kadonotakashi 0:8fdf9a60065b 42
kadonotakashi 0:8fdf9a60065b 43 /** Initialize the high frequency ticker
kadonotakashi 0:8fdf9a60065b 44 *
kadonotakashi 0:8fdf9a60065b 45 */
kadonotakashi 0:8fdf9a60065b 46 void us_ticker_init(void)
kadonotakashi 0:8fdf9a60065b 47 {
kadonotakashi 0:8fdf9a60065b 48 /* Common for ticker/timer. */
kadonotakashi 0:8fdf9a60065b 49 uint32_t busClock;
kadonotakashi 0:8fdf9a60065b 50 /* Structure to initialize PIT. */
kadonotakashi 0:8fdf9a60065b 51 pit_config_t pitConfig;
kadonotakashi 0:8fdf9a60065b 52
kadonotakashi 0:8fdf9a60065b 53 PIT_GetDefaultConfig(&pitConfig);
kadonotakashi 0:8fdf9a60065b 54 PIT_Init(PIT, &pitConfig);
kadonotakashi 0:8fdf9a60065b 55
kadonotakashi 0:8fdf9a60065b 56 busClock = CLOCK_GetFreq(kCLOCK_BusClk);
kadonotakashi 0:8fdf9a60065b 57
kadonotakashi 0:8fdf9a60065b 58 /* Let the timer to count if re-init. */
kadonotakashi 0:8fdf9a60065b 59 if (!us_ticker_inited) {
kadonotakashi 0:8fdf9a60065b 60
kadonotakashi 0:8fdf9a60065b 61 PIT_SetTimerPeriod(PIT, kPIT_Chnl_0, busClock / 1000000 - 1);
kadonotakashi 0:8fdf9a60065b 62 PIT_SetTimerPeriod(PIT, kPIT_Chnl_1, 0xFFFFFFFF);
kadonotakashi 0:8fdf9a60065b 63 PIT_SetTimerChainMode(PIT, kPIT_Chnl_1, true);
kadonotakashi 0:8fdf9a60065b 64 PIT_StartTimer(PIT, kPIT_Chnl_0);
kadonotakashi 0:8fdf9a60065b 65 PIT_StartTimer(PIT, kPIT_Chnl_1);
kadonotakashi 0:8fdf9a60065b 66 }
kadonotakashi 0:8fdf9a60065b 67
kadonotakashi 0:8fdf9a60065b 68 /* Configure interrupt generation counters and disable ticker interrupts. */
kadonotakashi 0:8fdf9a60065b 69 PIT_StopTimer(PIT, kPIT_Chnl_3);
kadonotakashi 0:8fdf9a60065b 70 PIT_StopTimer(PIT, kPIT_Chnl_2);
kadonotakashi 0:8fdf9a60065b 71 PIT_SetTimerPeriod(PIT, kPIT_Chnl_2, busClock / 1000000 - 1);
kadonotakashi 0:8fdf9a60065b 72 PIT_SetTimerChainMode(PIT, kPIT_Chnl_3, true);
kadonotakashi 0:8fdf9a60065b 73 PIT_ClearStatusFlags(PIT, kPIT_Chnl_3, PIT_TFLG_TIF_MASK);
kadonotakashi 0:8fdf9a60065b 74 NVIC_SetVector(PIT3_IRQn, (uint32_t) pit_isr);
kadonotakashi 0:8fdf9a60065b 75 NVIC_EnableIRQ(PIT3_IRQn);
kadonotakashi 0:8fdf9a60065b 76 PIT_DisableInterrupts(PIT, kPIT_Chnl_3, kPIT_TimerInterruptEnable);
kadonotakashi 0:8fdf9a60065b 77
kadonotakashi 0:8fdf9a60065b 78 us_ticker_inited = true;
kadonotakashi 0:8fdf9a60065b 79 }
kadonotakashi 0:8fdf9a60065b 80
kadonotakashi 0:8fdf9a60065b 81 /** Read the current counter
kadonotakashi 0:8fdf9a60065b 82 *
kadonotakashi 0:8fdf9a60065b 83 * @return The current timer's counter value in ticks
kadonotakashi 0:8fdf9a60065b 84 */
kadonotakashi 0:8fdf9a60065b 85 uint32_t us_ticker_read()
kadonotakashi 0:8fdf9a60065b 86 {
kadonotakashi 0:8fdf9a60065b 87 return ~(PIT_GetCurrentTimerCount(PIT, kPIT_Chnl_1));
kadonotakashi 0:8fdf9a60065b 88 }
kadonotakashi 0:8fdf9a60065b 89
kadonotakashi 0:8fdf9a60065b 90 /** Disable us ticker interrupt
kadonotakashi 0:8fdf9a60065b 91 *
kadonotakashi 0:8fdf9a60065b 92 */
kadonotakashi 0:8fdf9a60065b 93 void us_ticker_disable_interrupt(void)
kadonotakashi 0:8fdf9a60065b 94 {
kadonotakashi 0:8fdf9a60065b 95 PIT_DisableInterrupts(PIT, kPIT_Chnl_3, kPIT_TimerInterruptEnable);
kadonotakashi 0:8fdf9a60065b 96 }
kadonotakashi 0:8fdf9a60065b 97
kadonotakashi 0:8fdf9a60065b 98 /** Clear us ticker interrupt
kadonotakashi 0:8fdf9a60065b 99 *
kadonotakashi 0:8fdf9a60065b 100 */
kadonotakashi 0:8fdf9a60065b 101 void us_ticker_clear_interrupt(void)
kadonotakashi 0:8fdf9a60065b 102 {
kadonotakashi 0:8fdf9a60065b 103 PIT_ClearStatusFlags(PIT, kPIT_Chnl_3, PIT_TFLG_TIF_MASK);
kadonotakashi 0:8fdf9a60065b 104 }
kadonotakashi 0:8fdf9a60065b 105
kadonotakashi 0:8fdf9a60065b 106 /** Set interrupt for specified timestamp
kadonotakashi 0:8fdf9a60065b 107 *
kadonotakashi 0:8fdf9a60065b 108 * @param timestamp The time in ticks when interrupt should be generated
kadonotakashi 0:8fdf9a60065b 109 */
kadonotakashi 0:8fdf9a60065b 110 void us_ticker_set_interrupt(timestamp_t timestamp)
kadonotakashi 0:8fdf9a60065b 111 {
kadonotakashi 0:8fdf9a60065b 112 /* We get here absolute interrupt time which takes into account counter overflow.
kadonotakashi 0:8fdf9a60065b 113 * Since we use additional count-down timer to generate interrupt we need to calculate
kadonotakashi 0:8fdf9a60065b 114 * load value based on time-stamp.
kadonotakashi 0:8fdf9a60065b 115 */
kadonotakashi 0:8fdf9a60065b 116 const uint32_t now_ticks = us_ticker_read();
kadonotakashi 0:8fdf9a60065b 117 uint32_t delta_ticks =
kadonotakashi 0:8fdf9a60065b 118 timestamp >= now_ticks ? timestamp - now_ticks : (uint32_t)((uint64_t) timestamp + 0xFFFFFFFF - now_ticks);
kadonotakashi 0:8fdf9a60065b 119
kadonotakashi 0:8fdf9a60065b 120 if (delta_ticks == 0) {
kadonotakashi 0:8fdf9a60065b 121 /* The requested delay is less than the minimum resolution of this counter. */
kadonotakashi 0:8fdf9a60065b 122 delta_ticks = 1;
kadonotakashi 0:8fdf9a60065b 123 }
kadonotakashi 0:8fdf9a60065b 124
kadonotakashi 0:8fdf9a60065b 125 PIT_StopTimer(PIT, kPIT_Chnl_3);
kadonotakashi 0:8fdf9a60065b 126 PIT_StopTimer(PIT, kPIT_Chnl_2);
kadonotakashi 0:8fdf9a60065b 127 PIT_SetTimerPeriod(PIT, kPIT_Chnl_3, delta_ticks);
kadonotakashi 0:8fdf9a60065b 128 PIT_EnableInterrupts(PIT, kPIT_Chnl_3, kPIT_TimerInterruptEnable);
kadonotakashi 0:8fdf9a60065b 129 PIT_StartTimer(PIT, kPIT_Chnl_3);
kadonotakashi 0:8fdf9a60065b 130 PIT_StartTimer(PIT, kPIT_Chnl_2);
kadonotakashi 0:8fdf9a60065b 131 }
kadonotakashi 0:8fdf9a60065b 132
kadonotakashi 0:8fdf9a60065b 133 /** Fire us ticker interrupt
kadonotakashi 0:8fdf9a60065b 134 *
kadonotakashi 0:8fdf9a60065b 135 */
kadonotakashi 0:8fdf9a60065b 136 void us_ticker_fire_interrupt(void)
kadonotakashi 0:8fdf9a60065b 137 {
kadonotakashi 0:8fdf9a60065b 138 NVIC_SetPendingIRQ(PIT3_IRQn);
kadonotakashi 0:8fdf9a60065b 139 }
kadonotakashi 0:8fdf9a60065b 140
kadonotakashi 0:8fdf9a60065b 141 void us_ticker_free(void)
kadonotakashi 0:8fdf9a60065b 142 {
kadonotakashi 0:8fdf9a60065b 143 PIT_StartTimer(PIT, kPIT_Chnl_3);
kadonotakashi 0:8fdf9a60065b 144 PIT_StartTimer(PIT, kPIT_Chnl_2);
kadonotakashi 0:8fdf9a60065b 145 PIT_StartTimer(PIT, kPIT_Chnl_1);
kadonotakashi 0:8fdf9a60065b 146 PIT_StartTimer(PIT, kPIT_Chnl_0);
kadonotakashi 0:8fdf9a60065b 147
kadonotakashi 0:8fdf9a60065b 148 PIT_DisableInterrupts(PIT, kPIT_Chnl_3, kPIT_TimerInterruptEnable);
kadonotakashi 0:8fdf9a60065b 149 NVIC_DisableIRQ(PIT3_IRQn);
kadonotakashi 0:8fdf9a60065b 150
kadonotakashi 0:8fdf9a60065b 151 us_ticker_inited = false;
kadonotakashi 0:8fdf9a60065b 152 }