added prescaler for 16 bit pwm in LPC1347 target
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Diff: targets/hal/TARGET_Freescale/TARGET_K20XX/rtc_api.c
- Revision:
- 144:ef7eb2e8f9f7
- Parent:
- 0:9b334a45a8ff
--- a/targets/hal/TARGET_Freescale/TARGET_K20XX/rtc_api.c Tue Aug 02 14:07:36 2016 +0000 +++ b/targets/hal/TARGET_Freescale/TARGET_K20XX/rtc_api.c Fri Sep 02 15:07:44 2016 +0100 @@ -1,91 +1,91 @@ -/* mbed Microcontroller Library - * Copyright (c) 2006-2015 ARM Limited - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ -#include "rtc_api.h" - -static void init(void) { - // enable PORTC clock - SIM->SCGC5 |= SIM_SCGC5_PORTC_MASK; - - // enable RTC clock - SIM->SCGC6 |= SIM_SCGC6_RTC_MASK; - - // OSC32 as source - SIM->SOPT1 &= ~SIM_SOPT1_OSC32KSEL_MASK; - SIM->SOPT1 |= SIM_SOPT1_OSC32KSEL(0); -} - -void rtc_init(void) { - init(); - - // Enable the oscillator -#if defined (TARGET_K20D50M) - RTC->CR |= RTC_CR_OSCE_MASK; -#else - // Teensy3.1 requires 20pF MCU loading capacitors for 32KHz RTC oscillator - /* RTC->CR: SC2P=0,SC4P=1,SC8P=0,SC16P=1,CLKO=0,OSCE=1,UM=0,SUP=0,SPE=0,SWR=0 */ - RTC->CR |= RTC_CR_OSCE_MASK |RTC_CR_SC16P_MASK | RTC_CR_SC4P_MASK; -#endif - - //Configure the TSR. default value: 1 - RTC->TSR = 1; - - // enable counter - RTC->SR |= RTC_SR_TCE_MASK; -} - -void rtc_free(void) { - // [TODO] -} - -/* - * Little check routine to see if the RTC has been enabled - * 0 = Disabled, 1 = Enabled - */ -int rtc_isenabled(void) { - // even if the RTC module is enabled, - // as we use RTC_CLKIN and an external clock, - // we need to reconfigure the pins. That is why we - // call init() if the rtc is enabled - - // if RTC not enabled return 0 - SIM->SCGC5 |= SIM_SCGC5_PORTC_MASK; - SIM->SCGC6 |= SIM_SCGC6_RTC_MASK; - if ((RTC->SR & RTC_SR_TCE_MASK) == 0) - return 0; - - init(); - return 1; -} - -time_t rtc_read(void) { - return RTC->TSR; -} - -void rtc_write(time_t t) { - // disable counter - RTC->SR &= ~RTC_SR_TCE_MASK; - - // we do not write 0 into TSR - // to avoid invalid time - if (t == 0) - t = 1; - - // write seconds - RTC->TSR = t; - - // re-enable counter - RTC->SR |= RTC_SR_TCE_MASK; -} +/* mbed Microcontroller Library + * Copyright (c) 2006-2015 ARM Limited + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +#include "rtc_api.h" + +static void init(void) { + // enable PORTC clock + SIM->SCGC5 |= SIM_SCGC5_PORTC_MASK; + + // enable RTC clock + SIM->SCGC6 |= SIM_SCGC6_RTC_MASK; + + // OSC32 as source + SIM->SOPT1 &= ~SIM_SOPT1_OSC32KSEL_MASK; + SIM->SOPT1 |= SIM_SOPT1_OSC32KSEL(0); +} + +void rtc_init(void) { + init(); + + // Enable the oscillator +#if defined (TARGET_K20D50M) + RTC->CR |= RTC_CR_OSCE_MASK; +#else + // Teensy3.1 requires 20pF MCU loading capacitors for 32KHz RTC oscillator + /* RTC->CR: SC2P=0,SC4P=1,SC8P=0,SC16P=1,CLKO=0,OSCE=1,UM=0,SUP=0,SPE=0,SWR=0 */ + RTC->CR |= RTC_CR_OSCE_MASK |RTC_CR_SC16P_MASK | RTC_CR_SC4P_MASK; +#endif + + //Configure the TSR. default value: 1 + RTC->TSR = 1; + + // enable counter + RTC->SR |= RTC_SR_TCE_MASK; +} + +void rtc_free(void) { + // [TODO] +} + +/* + * Little check routine to see if the RTC has been enabled + * 0 = Disabled, 1 = Enabled + */ +int rtc_isenabled(void) { + // even if the RTC module is enabled, + // as we use RTC_CLKIN and an external clock, + // we need to reconfigure the pins. That is why we + // call init() if the rtc is enabled + + // if RTC not enabled return 0 + SIM->SCGC5 |= SIM_SCGC5_PORTC_MASK; + SIM->SCGC6 |= SIM_SCGC6_RTC_MASK; + if ((RTC->SR & RTC_SR_TCE_MASK) == 0) + return 0; + + init(); + return 1; +} + +time_t rtc_read(void) { + return RTC->TSR; +} + +void rtc_write(time_t t) { + // disable counter + RTC->SR &= ~RTC_SR_TCE_MASK; + + // we do not write 0 into TSR + // to avoid invalid time + if (t == 0) + t = 1; + + // write seconds + RTC->TSR = t; + + // re-enable counter + RTC->SR |= RTC_SR_TCE_MASK; +}