Johannes Stratmann / mbed-dev

added prescaler for 16 bit pwm in LPC1347 target

Fork of mbed-dev by mbed official

targets/hal/TARGET_NUVOTON/TARGET_NUC472/sleep.c@144:ef7eb2e8f9f7, 2016-09-02 (annotated)

Committer:
<>
Date:
Fri Sep 02 15:07:44 2016 +0100
Revision:
144:ef7eb2e8f9f7
This updates the lib to the mbed lib v125

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 144:ef7eb2e8f9f7 1 /* mbed Microcontroller Library
<> 144:ef7eb2e8f9f7 2 * Copyright (c) 2015-2016 Nuvoton
<> 144:ef7eb2e8f9f7 3 *
<> 144:ef7eb2e8f9f7 4 * Licensed under the Apache License, Version 2.0 (the "License");
<> 144:ef7eb2e8f9f7 5 * you may not use this file except in compliance with the License.
<> 144:ef7eb2e8f9f7 6 * You may obtain a copy of the License at
<> 144:ef7eb2e8f9f7 7 *
<> 144:ef7eb2e8f9f7 8 * http://www.apache.org/licenses/LICENSE-2.0
<> 144:ef7eb2e8f9f7 9 *
<> 144:ef7eb2e8f9f7 10 * Unless required by applicable law or agreed to in writing, software
<> 144:ef7eb2e8f9f7 11 * distributed under the License is distributed on an "AS IS" BASIS,
<> 144:ef7eb2e8f9f7 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 144:ef7eb2e8f9f7 13 * See the License for the specific language governing permissions and
<> 144:ef7eb2e8f9f7 14 * limitations under the License.
<> 144:ef7eb2e8f9f7 15 */
<> 144:ef7eb2e8f9f7 16
<> 144:ef7eb2e8f9f7 17 #include "sleep_api.h"
<> 144:ef7eb2e8f9f7 18 #include "serial_api.h"
<> 144:ef7eb2e8f9f7 19 #include "lp_ticker_api.h"
<> 144:ef7eb2e8f9f7 20
<> 144:ef7eb2e8f9f7 21 #if DEVICE_SLEEP
<> 144:ef7eb2e8f9f7 22
<> 144:ef7eb2e8f9f7 23 #include "cmsis.h"
<> 144:ef7eb2e8f9f7 24 #include "device.h"
<> 144:ef7eb2e8f9f7 25 #include "objects.h"
<> 144:ef7eb2e8f9f7 26 #include "PeripheralPins.h"
<> 144:ef7eb2e8f9f7 27
<> 144:ef7eb2e8f9f7 28 void us_ticker_prepare_sleep(struct sleep_s *obj);
<> 144:ef7eb2e8f9f7 29 void us_ticker_wakeup_from_sleep(struct sleep_s *obj);
<> 144:ef7eb2e8f9f7 30 static void mbed_enter_sleep(struct sleep_s *obj);
<> 144:ef7eb2e8f9f7 31 static void mbed_exit_sleep(struct sleep_s *obj);
<> 144:ef7eb2e8f9f7 32
<> 144:ef7eb2e8f9f7 33 int serial_allow_powerdown(void);
<> 144:ef7eb2e8f9f7 34 int spi_allow_powerdown(void);
<> 144:ef7eb2e8f9f7 35 int i2c_allow_powerdown(void);
<> 144:ef7eb2e8f9f7 36 int pwmout_allow_powerdown(void);
<> 144:ef7eb2e8f9f7 37
<> 144:ef7eb2e8f9f7 38 /**
<> 144:ef7eb2e8f9f7 39 * Enter Idle mode.
<> 144:ef7eb2e8f9f7 40 */
<> 144:ef7eb2e8f9f7 41 void sleep(void)
<> 144:ef7eb2e8f9f7 42 {
<> 144:ef7eb2e8f9f7 43 struct sleep_s sleep_obj;
<> 144:ef7eb2e8f9f7 44 sleep_obj.powerdown = 0;
<> 144:ef7eb2e8f9f7 45 mbed_enter_sleep(&sleep_obj);
<> 144:ef7eb2e8f9f7 46 mbed_exit_sleep(&sleep_obj);
<> 144:ef7eb2e8f9f7 47 }
<> 144:ef7eb2e8f9f7 48
<> 144:ef7eb2e8f9f7 49 /**
<> 144:ef7eb2e8f9f7 50 * Enter Power-down mode while no peripheral is active; otherwise, enter Idle mode.
<> 144:ef7eb2e8f9f7 51 */
<> 144:ef7eb2e8f9f7 52 void deepsleep(void)
<> 144:ef7eb2e8f9f7 53 {
<> 144:ef7eb2e8f9f7 54 struct sleep_s sleep_obj;
<> 144:ef7eb2e8f9f7 55 sleep_obj.powerdown = 1;
<> 144:ef7eb2e8f9f7 56 mbed_enter_sleep(&sleep_obj);
<> 144:ef7eb2e8f9f7 57 mbed_exit_sleep(&sleep_obj);
<> 144:ef7eb2e8f9f7 58 }
<> 144:ef7eb2e8f9f7 59
<> 144:ef7eb2e8f9f7 60 static void mbed_enter_sleep(struct sleep_s *obj)
<> 144:ef7eb2e8f9f7 61 {
<> 144:ef7eb2e8f9f7 62 // Check if serial allows entering power-down mode
<> 144:ef7eb2e8f9f7 63 if (obj->powerdown) {
<> 144:ef7eb2e8f9f7 64 obj->powerdown = serial_allow_powerdown();
<> 144:ef7eb2e8f9f7 65 }
<> 144:ef7eb2e8f9f7 66 // Check if spi allows entering power-down mode
<> 144:ef7eb2e8f9f7 67 if (obj->powerdown) {
<> 144:ef7eb2e8f9f7 68 obj->powerdown = spi_allow_powerdown();
<> 144:ef7eb2e8f9f7 69 }
<> 144:ef7eb2e8f9f7 70 // Check if i2c allows entering power-down mode
<> 144:ef7eb2e8f9f7 71 if (obj->powerdown) {
<> 144:ef7eb2e8f9f7 72 obj->powerdown = i2c_allow_powerdown();
<> 144:ef7eb2e8f9f7 73 }
<> 144:ef7eb2e8f9f7 74 // Check if pwmout allows entering power-down mode
<> 144:ef7eb2e8f9f7 75 if (obj->powerdown) {
<> 144:ef7eb2e8f9f7 76 obj->powerdown = pwmout_allow_powerdown();
<> 144:ef7eb2e8f9f7 77 }
<> 144:ef7eb2e8f9f7 78 // TODO: Check if other peripherals allow entering power-down mode
<> 144:ef7eb2e8f9f7 79
<> 144:ef7eb2e8f9f7 80 obj->start_us = lp_ticker_read();
<> 144:ef7eb2e8f9f7 81 // Let us_ticker prepare for power-down or reject it.
<> 144:ef7eb2e8f9f7 82 us_ticker_prepare_sleep(obj);
<> 144:ef7eb2e8f9f7 83
<> 144:ef7eb2e8f9f7 84 // NOTE(STALE): To pass mbed-drivers test, timer requires to be fine-grained, so its implementation needs HIRC rather than LIRC/LXT as its clock source.
<> 144:ef7eb2e8f9f7 85 // But as CLK_PowerDown()/CLK_Idle() is called, HIRC will be disabled and timer cannot keep counting and alarm. To overcome the dilemma,
<> 144:ef7eb2e8f9f7 86 // just make CPU halt and compromise power saving.
<> 144:ef7eb2e8f9f7 87 // NOTE: As CLK_PowerDown()/CLK_Idle() is called, HIRC/HXT will be disabled in normal mode, but not in ICE mode. This may cause confusion in development.
<> 144:ef7eb2e8f9f7 88
<> 144:ef7eb2e8f9f7 89 if (obj->powerdown) { // Power-down mode (HIRC/HXT disabled, LIRC/LXT enabled)
<> 144:ef7eb2e8f9f7 90 SYS_UnlockReg();
<> 144:ef7eb2e8f9f7 91 CLK_PowerDown();
<> 144:ef7eb2e8f9f7 92 SYS_LockReg();
<> 144:ef7eb2e8f9f7 93 }
<> 144:ef7eb2e8f9f7 94 else { // CPU halt mode (HIRC/HXT enabled, LIRC/LXT enabled)
<> 144:ef7eb2e8f9f7 95 // NOTE: NUC472's CLK_Idle() will also disable HIRC/HXT.
<> 144:ef7eb2e8f9f7 96 SYS_UnlockReg();
<> 144:ef7eb2e8f9f7 97 SCB->SCR &= ~SCB_SCR_SLEEPDEEP_Msk;
<> 144:ef7eb2e8f9f7 98 CLK->PWRCTL &= ~CLK_PWRCTL_PDEN_Msk;
<> 144:ef7eb2e8f9f7 99 __WFI();
<> 144:ef7eb2e8f9f7 100 SYS_LockReg();
<> 144:ef7eb2e8f9f7 101 }
<> 144:ef7eb2e8f9f7 102 __NOP();
<> 144:ef7eb2e8f9f7 103 __NOP();
<> 144:ef7eb2e8f9f7 104 __NOP();
<> 144:ef7eb2e8f9f7 105 __NOP();
<> 144:ef7eb2e8f9f7 106
<> 144:ef7eb2e8f9f7 107 obj->end_us = lp_ticker_read();
<> 144:ef7eb2e8f9f7 108 obj->period_us = (obj->end_us > obj->start_us) ? (obj->end_us - obj->start_us) : (uint32_t) ((uint64_t) obj->end_us + 0xFFFFFFFFu - obj->start_us);
<> 144:ef7eb2e8f9f7 109 // Let us_ticker recover from power-down.
<> 144:ef7eb2e8f9f7 110 us_ticker_wakeup_from_sleep(obj);
<> 144:ef7eb2e8f9f7 111 }
<> 144:ef7eb2e8f9f7 112
<> 144:ef7eb2e8f9f7 113 static void mbed_exit_sleep(struct sleep_s *obj)
<> 144:ef7eb2e8f9f7 114 {
<> 144:ef7eb2e8f9f7 115 // TODO: TO BE CONTINUED
<> 144:ef7eb2e8f9f7 116
<> 144:ef7eb2e8f9f7 117 (void)obj;
<> 144:ef7eb2e8f9f7 118 }
<> 144:ef7eb2e8f9f7 119
<> 144:ef7eb2e8f9f7 120 #endif