mbed library sources
Dependents: frdm_kl05z_gpio_test
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Diff: vendor/NXP/LPC1768/hal/rtc_api.c
- Revision:
- 10:3bc89ef62ce7
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/vendor/NXP/LPC1768/hal/rtc_api.c Fri Jun 14 17:49:17 2013 +0100 @@ -0,0 +1,113 @@ +/* mbed Microcontroller Library + * Copyright (c) 2006-2013 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" + +// ensure rtc is running (unchanged if already running) + +/* Setup the RTC based on a time structure, ensuring RTC is enabled + * + * Can be clocked by a 32.768KHz oscillator or prescale divider based on the APB clock + * - We want to use the 32khz clock, allowing for sleep mode + * + * Most registers are not changed by a Reset + * - We must initialize these registers between power-on and setting the RTC into operation + + * Clock Control Register + * RTC_CCR[0] : Enable - 0 = Disabled, 1 = Enabled + * RTC_CCR[1] : Reset - 0 = Normal, 1 = Reset + * RTC_CCR[4] : Clock Source - 0 = Prescaler, 1 = 32k Xtal + * + * The RTC may already be running, so we should set it up + * without impacting if it is the case + */ +void rtc_init(void) { + LPC_SC->PCONP |= 0x200; // Ensure power is on + LPC_RTC->CCR = 0x00; + + LPC_RTC->CCR |= 1 << 0; // Ensure the RTC is enabled +} + +void rtc_free(void) { + // [TODO] +} + +/* + * Little check routine to see if the RTC has been enabled + * + * Clock Control Register + * RTC_CCR[0] : 0 = Disabled, 1 = Enabled + * + */ +int rtc_isenabled(void) { + return(((LPC_RTC->CCR) & 0x01) != 0); +} + +/* + * RTC Registers + * RTC_SEC Seconds 0-59 + * RTC_MIN Minutes 0-59 + * RTC_HOUR Hour 0-23 + * RTC_DOM Day of Month 1-28..31 + * RTC_DOW Day of Week 0-6 + * RTC_DOY Day of Year 1-365 + * RTC_MONTH Month 1-12 + * RTC_YEAR Year 0-4095 + * + * struct tm + * tm_sec seconds after the minute 0-61 + * tm_min minutes after the hour 0-59 + * tm_hour hours since midnight 0-23 + * tm_mday day of the month 1-31 + * tm_mon months since January 0-11 + * tm_year years since 1900 + * tm_wday days since Sunday 0-6 + * tm_yday days since January 1 0-365 + * tm_isdst Daylight Saving Time flag + */ +time_t rtc_read(void) { + // Setup a tm structure based on the RTC + struct tm timeinfo; + timeinfo.tm_sec = LPC_RTC->SEC; + timeinfo.tm_min = LPC_RTC->MIN; + timeinfo.tm_hour = LPC_RTC->HOUR; + timeinfo.tm_mday = LPC_RTC->DOM; + timeinfo.tm_mon = LPC_RTC->MONTH - 1; + timeinfo.tm_year = LPC_RTC->YEAR - 1900; + + // Convert to timestamp + time_t t = mktime(&timeinfo); + + return t; +} + +void rtc_write(time_t t) { + // Convert the time in to a tm + struct tm *timeinfo = localtime(&t); + + // Pause clock, and clear counter register (clears us count) + LPC_RTC->CCR |= 2; + + // Set the RTC + LPC_RTC->SEC = timeinfo->tm_sec; + LPC_RTC->MIN = timeinfo->tm_min; + LPC_RTC->HOUR = timeinfo->tm_hour; + LPC_RTC->DOM = timeinfo->tm_mday; + LPC_RTC->MONTH = timeinfo->tm_mon + 1; + LPC_RTC->YEAR = timeinfo->tm_year + 1900; + + // Restart clock + LPC_RTC->CCR &= ~((uint32_t)2); +}