NXP_PCF2127A - "PCF2127A" : RTC chip with TCXO and quartz crysta…

Users » okano » Code » NXP_PCF2127A

Tedd OKANO / Mbed 2 deprecated NXP_PCF2127A

"PCF2127A" : RTC chip with TCXO and quartz crystal demo Please refer >> http://mbed.org/users/okano/notebook/nxp_pcf2172a-demo-code/

Dependencies: mbed

Information

Latest version is available on components page.

NXP_PCF2127A.h@0:e13d786ba650, 2010-06-05 (annotated)

Committer:: okano
Date:: Sat Jun 05 02:18:50 2010 +0000
Revision:: 0:e13d786ba650

Who changed what in which revision?

User	Revision	Line number	New contents of line
okano	0:e13d786ba650	1	/*
okano	0:e13d786ba650	2	* PCF2127A (Integrated RTC, TCXO and quartz crystal) demo
okano	0:e13d786ba650	3	* (library)
okano	0:e13d786ba650	4	*
okano	0:e13d786ba650	5	* PCF2127A is a "real time clock (RTC)" module which is including a Xtal and TCXO
okano	0:e13d786ba650	6	* http://www.nxp.com/pip/PCF2127A_2.html
okano	0:e13d786ba650	7	*
okano	0:e13d786ba650	8	* This is a just simple operation sample of the PCF2127A.
okano	0:e13d786ba650	9	* In this sample, the PCF2127A is interfaced by I2C through pin9 and 10 of mbed.
okano	0:e13d786ba650	10	* And also the mbed-pin8 is connected to RTC's /INT pin.
okano	0:e13d786ba650	11	* The RTC chip is set to generate periodical interrupt in every seconds.
okano	0:e13d786ba650	12	* This interrupt triggers the update of the terminal and LCD screen.
okano	0:e13d786ba650	13	*
okano	0:e13d786ba650	14	* RTC initializing part is ported from...
okano	0:e13d786ba650	15	* http://mbed.org/users/roen/notebook/real-time/
okano	0:e13d786ba650	16	*
okano	0:e13d786ba650	17	* Released under the MIT License: http://mbed.org/license/mit
okano	0:e13d786ba650	18	*
okano	0:e13d786ba650	19	* revision 1.0 05-Jun-2010 (a) 1st release
okano	0:e13d786ba650	20	* revision 1.1 05-Jun-2010 (a) class name changed
okano	0:e13d786ba650	21	*
okano	0:e13d786ba650	22	*/
okano	0:e13d786ba650	23
okano	0:e13d786ba650	24
okano	0:e13d786ba650	25	#ifndef MBED_NXP_PCF2127A
okano	0:e13d786ba650	26	#define MBED_NXP_PCF2127A
okano	0:e13d786ba650	27
okano	0:e13d786ba650	28
okano	0:e13d786ba650	29	#include "mbed.h"
okano	0:e13d786ba650	30
okano	0:e13d786ba650	31
okano	0:e13d786ba650	32	// PCF2127A IIC address
okano	0:e13d786ba650	33	#define PCF2127A_addr 0xA2
okano	0:e13d786ba650	34
okano	0:e13d786ba650	35	// PCF2127A registers
okano	0:e13d786ba650	36	#define Control_1 0x00
okano	0:e13d786ba650	37	#define Control_2 0x01
okano	0:e13d786ba650	38	#define Control_3 0x02
okano	0:e13d786ba650	39	#define Seconds 0x03
okano	0:e13d786ba650	40	#define Minutes 0x04
okano	0:e13d786ba650	41	#define Hours 0x05
okano	0:e13d786ba650	42	#define Days 0x06
okano	0:e13d786ba650	43	#define Weekdays 0x07
okano	0:e13d786ba650	44	#define Months 0x08
okano	0:e13d786ba650	45	#define Years 0x09
okano	0:e13d786ba650	46	#define Second_alarm 0x0A
okano	0:e13d786ba650	47	#define Minute_alarm 0x0B
okano	0:e13d786ba650	48	#define Hour_alarm 0x0C
okano	0:e13d786ba650	49	#define Day_alarm 0x0D
okano	0:e13d786ba650	50	#define Weekday_alarm 0x0E
okano	0:e13d786ba650	51	#define CLKOUT_ctl 0x0F
okano	0:e13d786ba650	52	#define Watchdg_tim_ctl 0x10
okano	0:e13d786ba650	53	#define Watchdg_tim_val 0x11
okano	0:e13d786ba650	54	#define Timestp_ctl 0x12
okano	0:e13d786ba650	55	#define Sec_timestp 0x13
okano	0:e13d786ba650	56	#define Min_timestp 0x14
okano	0:e13d786ba650	57	#define Hour_timestp 0x15
okano	0:e13d786ba650	58	#define Day_timestp 0x16
okano	0:e13d786ba650	59	#define Mon_timestp 0x17
okano	0:e13d786ba650	60	#define Year_timestp 0x18
okano	0:e13d786ba650	61	#define Aging_offset 0x19
okano	0:e13d786ba650	62
okano	0:e13d786ba650	63	class NXP_PCF2127A {
okano	0:e13d786ba650	64	public:
okano	0:e13d786ba650	65
okano	0:e13d786ba650	66	NXP_PCF2127A(
okano	0:e13d786ba650	67	PinName sda,
okano	0:e13d786ba650	68	PinName sdl,
okano	0:e13d786ba650	69	char dev_address = PCF2127A_addr,
okano	0:e13d786ba650	70	char vControl_1 = 0x03,
okano	0:e13d786ba650	71	char vControl_2 = 0x00,
okano	0:e13d786ba650	72	char vControl_3 = 0x60
okano	0:e13d786ba650	73	)
okano	0:e13d786ba650	74	: i2c( sda, sdl ), device_address( dev_address ) {
okano	0:e13d786ba650	75	set_register( Control_1, vControl_1 );
okano	0:e13d786ba650	76	set_register( Control_2, vControl_2 );
okano	0:e13d786ba650	77	set_register( Control_3, vControl_3 );
okano	0:e13d786ba650	78	}
okano	0:e13d786ba650	79
okano	0:e13d786ba650	80	~NXP_PCF2127A() {
okano	0:e13d786ba650	81	}
okano	0:e13d786ba650	82
okano	0:e13d786ba650	83	int is_init_required( void ) {
okano	0:e13d786ba650	84	return ( read_register( Seconds ) & 0x80 ? 1 : 0 );
okano	0:e13d786ba650	85	}
okano	0:e13d786ba650	86
okano	0:e13d786ba650	87	void set_time( void ) {
okano	0:e13d786ba650	88	struct tm dt, *dtp;
okano	0:e13d786ba650	89	char buf[ 8 ];
okano	0:e13d786ba650	90	char c;
okano	0:e13d786ba650	91
okano	0:e13d786ba650	92	dtp = &dt;
okano	0:e13d786ba650	93
okano	0:e13d786ba650	94	//#define TIME_SETTING_TEST
okano	0:e13d786ba650	95	#ifndef TIME_SETTING_TEST
okano	0:e13d786ba650	96	printf("Enter current date and time:\r\n");
okano	0:e13d786ba650	97	printf("YYYY MM DD HH MM SS[enter]\r\n");
okano	0:e13d786ba650	98	scanf("%d %d %d %d %d %d", &(dtp->tm_year), &(dtp->tm_mon), &(dtp->tm_mday), &(dtp->tm_hour), &(dtp->tm_min), &(dtp->tm_sec) );
okano	0:e13d786ba650	99	printf("%d/%d/%d - %d:%d:%d\r\n", (dtp->tm_year), (dtp->tm_mon), (dtp->tm_mday), (dtp->tm_hour), (dtp->tm_min), (dtp->tm_sec) );
okano	0:e13d786ba650	100
okano	0:e13d786ba650	101	#else
okano	0:e13d786ba650	102	dtp->tm_year = 2010;
okano	0:e13d786ba650	103	dtp->tm_mon = 12;
okano	0:e13d786ba650	104	dtp->tm_mday = 31;
okano	0:e13d786ba650	105	dtp->tm_hour = 23;
okano	0:e13d786ba650	106	dtp->tm_min = 59;
okano	0:e13d786ba650	107	dtp->tm_sec = 50;
okano	0:e13d786ba650	108
okano	0:e13d786ba650	109	#endif
okano	0:e13d786ba650	110
okano	0:e13d786ba650	111	// adjust for tm structure required values
okano	0:e13d786ba650	112	dtp->tm_year = dtp->tm_year - 1900;
okano	0:e13d786ba650	113	dtp->tm_mon = dtp->tm_mon - 1;
okano	0:e13d786ba650	114
okano	0:e13d786ba650	115	buf[ 0 ] = Seconds;
okano	0:e13d786ba650	116	buf[ 1 ] = i2bcd( dtp->tm_sec );
okano	0:e13d786ba650	117	buf[ 2 ] = i2bcd( dtp->tm_min );
okano	0:e13d786ba650	118	buf[ 3 ] = i2bcd( dtp->tm_hour );
okano	0:e13d786ba650	119	buf[ 4 ] = i2bcd( dtp->tm_mday );
okano	0:e13d786ba650	120	buf[ 5 ] = i2bcd( dtp->tm_wday );
okano	0:e13d786ba650	121	buf[ 6 ] = i2bcd( dtp->tm_mon + 1 );
okano	0:e13d786ba650	122	buf[ 7 ] = i2bcd( dtp->tm_year - 100 );
okano	0:e13d786ba650	123
okano	0:e13d786ba650	124	c = read_register( Seconds );
okano	0:e13d786ba650	125	while ( c == read_register( Seconds ) )
okano	0:e13d786ba650	126	;
okano	0:e13d786ba650	127
okano	0:e13d786ba650	128	i2c.write( device_address, buf, 8 );
okano	0:e13d786ba650	129	}
okano	0:e13d786ba650	130
okano	0:e13d786ba650	131
okano	0:e13d786ba650	132	time_t time( time_t *tp ) {
okano	0:e13d786ba650	133	struct tm dt, *dtp;
okano	0:e13d786ba650	134	time_t t;
okano	0:e13d786ba650	135	char buf[ 8 ] = { Seconds };
okano	0:e13d786ba650	136
okano	0:e13d786ba650	137	dtp = &dt;
okano	0:e13d786ba650	138
okano	0:e13d786ba650	139	i2c.write( device_address, buf, 1 );
okano	0:e13d786ba650	140	i2c.read( device_address, buf, 7 );
okano	0:e13d786ba650	141
okano	0:e13d786ba650	142	dtp->tm_sec = bcd2i( buf[ 0 ] );
okano	0:e13d786ba650	143	dtp->tm_min = bcd2i( buf[ 1 ] );
okano	0:e13d786ba650	144	dtp->tm_hour = bcd2i( buf[ 2 ] );
okano	0:e13d786ba650	145	dtp->tm_mday = bcd2i( buf[ 3 ] );
okano	0:e13d786ba650	146	dtp->tm_wday = bcd2i( buf[ 4 ] );
okano	0:e13d786ba650	147	dtp->tm_mon = bcd2i( buf[ 5 ] ) - 1;
okano	0:e13d786ba650	148	dtp->tm_year = bcd2i( buf[ 6 ] ) + 100;
okano	0:e13d786ba650	149
okano	0:e13d786ba650	150	t = mktime( dtp );
okano	0:e13d786ba650	151
okano	0:e13d786ba650	152	if ( tp )
okano	0:e13d786ba650	153	*tp = t;
okano	0:e13d786ba650	154
okano	0:e13d786ba650	155	return( t );
okano	0:e13d786ba650	156	}
okano	0:e13d786ba650	157
okano	0:e13d786ba650	158	void set_alarm( char addr, char s ) {
okano	0:e13d786ba650	159	char v;
okano	0:e13d786ba650	160
okano	0:e13d786ba650	161	v = i2bcd( s );
okano	0:e13d786ba650	162	set_register( addr, v );
okano	0:e13d786ba650	163	}
okano	0:e13d786ba650	164
okano	0:e13d786ba650	165	void clear_intr( void ) {
okano	0:e13d786ba650	166	set_register( Control_2, 0x00 );
okano	0:e13d786ba650	167	}
okano	0:e13d786ba650	168
okano	0:e13d786ba650	169	private:
okano	0:e13d786ba650	170	I2C i2c;
okano	0:e13d786ba650	171	char device_address;
okano	0:e13d786ba650	172
okano	0:e13d786ba650	173	void set_register( char addr, char data ) {
okano	0:e13d786ba650	174	char b[ 2 ];
okano	0:e13d786ba650	175
okano	0:e13d786ba650	176	b[ 0 ] = addr;
okano	0:e13d786ba650	177	b[ 1 ] = data;
okano	0:e13d786ba650	178
okano	0:e13d786ba650	179	i2c.write( device_address, b, 2 );
okano	0:e13d786ba650	180	}
okano	0:e13d786ba650	181
okano	0:e13d786ba650	182	char read_register( char addr ) {
okano	0:e13d786ba650	183	char data;
okano	0:e13d786ba650	184
okano	0:e13d786ba650	185	data = addr;
okano	0:e13d786ba650	186	i2c.write( device_address, &data, 1 );
okano	0:e13d786ba650	187	i2c.read( device_address, &data, 1 );
okano	0:e13d786ba650	188
okano	0:e13d786ba650	189	return ( data );
okano	0:e13d786ba650	190	}
okano	0:e13d786ba650	191
okano	0:e13d786ba650	192	char i2bcd( char n ) {
okano	0:e13d786ba650	193	return ( ((n / 10) << 4) \| (n % 10) );
okano	0:e13d786ba650	194	}
okano	0:e13d786ba650	195
okano	0:e13d786ba650	196	char bcd2i( char bcd ) {
okano	0:e13d786ba650	197	return ( ((bcd >> 4) * 10) + (bcd & 0x0F) );
okano	0:e13d786ba650	198	}
okano	0:e13d786ba650	199	}
okano	0:e13d786ba650	200	;
okano	0:e13d786ba650	201	#endif // end of "#ifndef MBED_NXP_PCF2127A"

Repository toolbox

Export to desktop IDE

Build repository

Repository details

Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	05 Jun 2010
Imports:	17
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	1
Followers:	2

Information

NXP_PCF2127A.h@0:e13d786ba650, 2010-06-05 (annotated)

Who changed what in which revision?

Repository toolbox

Repository details

Important Information for this Arm website

Access Warning