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rtc.c
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1 /*
2 * @brief RTC example
3 *
4 * @note
5 * Copyright(C) NXP Semiconductors, 2012
6 * All rights reserved.
7 *
8 * @par
9 * Software that is described herein is for illustrative purposes only
10 * which provides customers with programming information regarding the
11 * LPC products. This software is supplied "AS IS" without any warranties of
12 * any kind, and NXP Semiconductors and its licensor disclaim any and
13 * all warranties, express or implied, including all implied warranties of
14 * merchantability, fitness for a particular purpose and non-infringement of
15 * intellectual property rights. NXP Semiconductors assumes no responsibility
16 * or liability for the use of the software, conveys no license or rights under any
17 * patent, copyright, mask work right, or any other intellectual property rights in
18 * or to any products. NXP Semiconductors reserves the right to make changes
19 * in the software without notification. NXP Semiconductors also makes no
20 * representation or warranty that such application will be suitable for the
21 * specified use without further testing or modification.
22 *
23 * @par
24 * Permission to use, copy, modify, and distribute this software and its
25 * documentation is hereby granted, under NXP Semiconductors' and its
26 * licensor's relevant copyrights in the software, without fee, provided that it
27 * is used in conjunction with NXP Semiconductors microcontrollers. This
28 * copyright, permission, and disclaimer notice must appear in all copies of
29 * this code.
30 */
31
32 #include "board.h"
33
67 /*****************************************************************************
68 * Private types/enumerations/variables
69 ****************************************************************************/
70
71 static volatile bool fIntervalReached;
72 static volatile bool fAlarmTimeMatched;
73 static volatile bool On0, On1;
74
75 /*****************************************************************************
76 * Public types/enumerations/variables
77 ****************************************************************************/
78
79 /*****************************************************************************
80 * Private functions
81 ****************************************************************************/
82
83 /* Gets and shows the current time and date */
84 static void showTime(IP_RTC_TIME_T *pTime)
85 {
86 DEBUGOUT("Time: %.2d:%.2d:%.2d %.2d/%.2d/%.4d\r\n", pTime->time[RTC_TIMETYPE_HOUR],
87 pTime->time[RTC_TIMETYPE_MINUTE],
88 pTime->time[RTC_TIMETYPE_SECOND],
89 pTime->time[RTC_TIMETYPE_MONTH],
90 pTime->time[RTC_TIMETYPE_DAYOFMONTH],
91 pTime->time[RTC_TIMETYPE_YEAR]);
92 }
93
94 /*****************************************************************************
95 * Public functions
96 ****************************************************************************/
97
102 void RTC_IRQHandler(void)
103 {
104 uint32_t sec;
105
106 /* Toggle heart beat LED for each second field change interrupt */
107 if (Chip_RTC_GetIntPending(LPC_RTC, RTC_INT_COUNTER_INCREASE)) {
108 /* Clear pending interrupt */
109 Chip_RTC_ClearIntPending(LPC_RTC, RTC_INT_COUNTER_INCREASE);
110 On0 = (bool) !On0;
111 Board_LED_Set(0, On0);
112 }
113
114 /* display timestamp every 5 seconds in the background */
115 sec = Chip_RTC_GetTime(LPC_RTC, RTC_TIMETYPE_SECOND);
116 if (!(sec % 5)) {
117 fIntervalReached = true; /* set flag for background */
118 }
119
120 /* Check for alarm match */
121 if (Chip_RTC_GetIntPending(LPC_RTC, RTC_INT_ALARM)) {
122 /* Clear pending interrupt */
123 Chip_RTC_ClearIntPending(LPC_RTC, RTC_INT_ALARM);
124 fAlarmTimeMatched = true; /* set alarm handler flag */
125 }
126 }
127
132 int main(void)
133 {
134 IP_RTC_TIME_T FullTime;
135
136 Board_Init();
137
138 fIntervalReached = 0;
139 fAlarmTimeMatched = 0;
140 On0 = On1 = false;
141 Board_LED_Set(2, false);
142
143 DEBUGSTR("The RTC operates on a 1 Hz clock.\r\n" \
144 "Register writes can take up to 2 cycles.\r\n" \
145 "It will take a few seconds to fully\r\n" \
146 "initialize it and start it running.\r\n\r\n");
147
148 DEBUGSTR("We'll print a timestamp every 5 seconds.\r\n" \
149 "...and another when the alarm occurs.\r\n");
150
151 Chip_RTC_Init(LPC_RTC);
152
153 /* Set current time for RTC 2:00:00PM, 2012-10-05 */
154 FullTime.time[RTC_TIMETYPE_SECOND] = 0;
155 FullTime.time[RTC_TIMETYPE_MINUTE] = 0;
156 FullTime.time[RTC_TIMETYPE_HOUR] = 14;
157 FullTime.time[RTC_TIMETYPE_DAYOFMONTH] = 5;
158 FullTime.time[RTC_TIMETYPE_DAYOFWEEK] = 5;
159 FullTime.time[RTC_TIMETYPE_DAYOFYEAR] = 279;
160 FullTime.time[RTC_TIMETYPE_MONTH] = 10;
161 FullTime.time[RTC_TIMETYPE_YEAR] = 2012;
162
163 Chip_RTC_SetFullTime(LPC_RTC, &FullTime);
164
165 /* Set ALARM time for 17 seconds from time */
166 FullTime.time[RTC_TIMETYPE_SECOND] = 17;
167 Chip_RTC_SetFullAlarmTime(LPC_RTC, &FullTime);
168
169 /* Set the RTC to generate an interrupt on each second */
170 Chip_RTC_CntIncrIntConfig(LPC_RTC, RTC_AMR_CIIR_IMSEC, ENABLE);
171
172 /* Enable matching for alarm for second, minute, hour fields only */
173 Chip_RTC_AlarmIntConfig(LPC_RTC, RTC_AMR_CIIR_IMSEC | RTC_AMR_CIIR_IMMIN | RTC_AMR_CIIR_IMHOUR, ENABLE);
174
175 /* Clear interrupt pending */
176 Chip_RTC_ClearIntPending(LPC_RTC, RTC_INT_COUNTER_INCREASE | RTC_INT_ALARM);
177
178 /* Enable RTC interrupt in NVIC */
179 NVIC_EnableIRQ((IRQn_Type) RTC_IRQn);
180
181 /* Enable RTC (starts increase the tick counter and second counter register) */
182 Chip_RTC_Enable(LPC_RTC, ENABLE);
183
184 /* Loop forever */
185 while (1) {
186 if (fIntervalReached) { /* Every 5s */
187 fIntervalReached = 0;
188
189 On1 = (bool) !On1;
190 Board_LED_Set(1, On1);
191
192 /* read and display time */
193 Chip_RTC_GetFullTime(LPC_RTC, &FullTime);
194 showTime(&FullTime);
195 }
196
197 if (fAlarmTimeMatched) {
198 fAlarmTimeMatched = false;
199
200 /* announce event */
201 DEBUGSTR("ALARM triggered!\r\n");
202 Board_LED_Set(2, true);
203
204 /* read and display time */
205 Chip_RTC_GetFullTime(LPC_RTC, &FullTime);
206 showTime(&FullTime);
207 }
208 }
209 }
210