Tedd OKANO
"PCF2127A" : RTC chip with TCXO and quartz crystal demo Please refer >> http://mbed.org/users/okano/notebook/nxp_pcf2172a-demo-code/
Information
Latest version is available on components page.
Revision 0:e13d786ba650, committed 2010-06-05
- Comitter:
- okano
- Date:
- Sat Jun 05 02:18:50 2010 +0000
- Commit message:
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/NXP_PCF2127A.h Sat Jun 05 02:18:50 2010 +0000
@@ -0,0 +1,201 @@
+/*
+ * PCF2127A (Integrated RTC, TCXO and quartz crystal) demo
+ * (library)
+ *
+ * PCF2127A is a "real time clock (RTC)" module which is including a Xtal and TCXO
+ * http://www.nxp.com/pip/PCF2127A_2.html
+ *
+ * This is a just simple operation sample of the PCF2127A.
+ * In this sample, the PCF2127A is interfaced by I2C through pin9 and 10 of mbed.
+ * And also the mbed-pin8 is connected to RTC's /INT pin.
+ * The RTC chip is set to generate periodical interrupt in every seconds.
+ * This interrupt triggers the update of the terminal and LCD screen.
+ *
+ * RTC initializing part is ported from...
+ * http://mbed.org/users/roen/notebook/real-time/
+ *
+ * Released under the MIT License: http://mbed.org/license/mit
+ *
+ * revision 1.0 05-Jun-2010 (a) 1st release
+ * revision 1.1 05-Jun-2010 (a) class name changed
+ *
+ */
+
+
+#ifndef MBED_NXP_PCF2127A
+#define MBED_NXP_PCF2127A
+
+
+#include "mbed.h"
+
+
+// PCF2127A IIC address
+#define PCF2127A_addr 0xA2
+
+// PCF2127A registers
+#define Control_1 0x00
+#define Control_2 0x01
+#define Control_3 0x02
+#define Seconds 0x03
+#define Minutes 0x04
+#define Hours 0x05
+#define Days 0x06
+#define Weekdays 0x07
+#define Months 0x08
+#define Years 0x09
+#define Second_alarm 0x0A
+#define Minute_alarm 0x0B
+#define Hour_alarm 0x0C
+#define Day_alarm 0x0D
+#define Weekday_alarm 0x0E
+#define CLKOUT_ctl 0x0F
+#define Watchdg_tim_ctl 0x10
+#define Watchdg_tim_val 0x11
+#define Timestp_ctl 0x12
+#define Sec_timestp 0x13
+#define Min_timestp 0x14
+#define Hour_timestp 0x15
+#define Day_timestp 0x16
+#define Mon_timestp 0x17
+#define Year_timestp 0x18
+#define Aging_offset 0x19
+
+class NXP_PCF2127A {
+public:
+
+ NXP_PCF2127A(
+ PinName sda,
+ PinName sdl,
+ char dev_address = PCF2127A_addr,
+ char vControl_1 = 0x03,
+ char vControl_2 = 0x00,
+ char vControl_3 = 0x60
+ )
+ : i2c( sda, sdl ), device_address( dev_address ) {
+ set_register( Control_1, vControl_1 );
+ set_register( Control_2, vControl_2 );
+ set_register( Control_3, vControl_3 );
+ }
+
+ ~NXP_PCF2127A() {
+ }
+
+ int is_init_required( void ) {
+ return ( read_register( Seconds ) & 0x80 ? 1 : 0 );
+ }
+
+ void set_time( void ) {
+ struct tm dt, *dtp;
+ char buf[ 8 ];
+ char c;
+
+ dtp = &dt;
+
+//#define TIME_SETTING_TEST
+#ifndef TIME_SETTING_TEST
+ printf("Enter current date and time:\r\n");
+ printf("YYYY MM DD HH MM SS[enter]\r\n");
+ 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) );
+ 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) );
+
+#else
+ dtp->tm_year = 2010;
+ dtp->tm_mon = 12;
+ dtp->tm_mday = 31;
+ dtp->tm_hour = 23;
+ dtp->tm_min = 59;
+ dtp->tm_sec = 50;
+
+#endif
+
+ // adjust for tm structure required values
+ dtp->tm_year = dtp->tm_year - 1900;
+ dtp->tm_mon = dtp->tm_mon - 1;
+
+ buf[ 0 ] = Seconds;
+ buf[ 1 ] = i2bcd( dtp->tm_sec );
+ buf[ 2 ] = i2bcd( dtp->tm_min );
+ buf[ 3 ] = i2bcd( dtp->tm_hour );
+ buf[ 4 ] = i2bcd( dtp->tm_mday );
+ buf[ 5 ] = i2bcd( dtp->tm_wday );
+ buf[ 6 ] = i2bcd( dtp->tm_mon + 1 );
+ buf[ 7 ] = i2bcd( dtp->tm_year - 100 );
+
+ c = read_register( Seconds );
+ while ( c == read_register( Seconds ) )
+ ;
+
+ i2c.write( device_address, buf, 8 );
+ }
+
+
+ time_t time( time_t *tp ) {
+ struct tm dt, *dtp;
+ time_t t;
+ char buf[ 8 ] = { Seconds };
+
+ dtp = &dt;
+
+ i2c.write( device_address, buf, 1 );
+ i2c.read( device_address, buf, 7 );
+
+ dtp->tm_sec = bcd2i( buf[ 0 ] );
+ dtp->tm_min = bcd2i( buf[ 1 ] );
+ dtp->tm_hour = bcd2i( buf[ 2 ] );
+ dtp->tm_mday = bcd2i( buf[ 3 ] );
+ dtp->tm_wday = bcd2i( buf[ 4 ] );
+ dtp->tm_mon = bcd2i( buf[ 5 ] ) - 1;
+ dtp->tm_year = bcd2i( buf[ 6 ] ) + 100;
+
+ t = mktime( dtp );
+
+ if ( tp )
+ *tp = t;
+
+ return( t );
+ }
+
+ void set_alarm( char addr, char s ) {
+ char v;
+
+ v = i2bcd( s );
+ set_register( addr, v );
+ }
+
+ void clear_intr( void ) {
+ set_register( Control_2, 0x00 );
+ }
+
+private:
+ I2C i2c;
+ char device_address;
+
+ void set_register( char addr, char data ) {
+ char b[ 2 ];
+
+ b[ 0 ] = addr;
+ b[ 1 ] = data;
+
+ i2c.write( device_address, b, 2 );
+ }
+
+ char read_register( char addr ) {
+ char data;
+
+ data = addr;
+ i2c.write( device_address, &data, 1 );
+ i2c.read( device_address, &data, 1 );
+
+ return ( data );
+ }
+
+ char i2bcd( char n ) {
+ return ( ((n / 10) << 4) | (n % 10) );
+ }
+
+ char bcd2i( char bcd ) {
+ return ( ((bcd >> 4) * 10) + (bcd & 0x0F) );
+ }
+}
+;
+#endif // end of "#ifndef MBED_NXP_PCF2127A"
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Sat Jun 05 02:18:50 2010 +0000
@@ -0,0 +1,89 @@
+/*
+ * PCF2127A (Integrated RTC, TCXO and quartz crystal) demo
+ *
+ * PCF2127A is a "real time clock (RTC)" module which is including a Xtal and TCXO
+ * http://www.nxp.com/pip/PCF2127A_2.html
+ *
+ * This is a just simple operation sample of the PCF2127A.
+ * In this sample, the PCF2127A is interfaced by I2C through pin9 and 10 of mbed.
+ * And also the mbed-pin8 is connected to RTC's /INT pin.
+ * The RTC chip is set to generate periodical interrupt in every seconds.
+ * This interrupt triggers the update of the terminal and LCD screen.
+ *
+ * RTC initializing part is ported from...
+ * http://mbed.org/users/roen/notebook/real-time/
+ *
+ * Released under the MIT License: http://mbed.org/license/mit
+ *
+ * revision 1.0 05-Jun-2010 (a) 1st release
+ * revision 1.1 05-Jun-2010 (a) class name changed
+ *
+ */
+
+#include "mbed.h"
+#include "TextLCD.h"
+#include "NXP_PCF2127A.h"
+
+TextLCD lcd(p24, p25, p26, p27, p28, p29, p30); // rs, rw, e, d0, d1, d2, d3
+NXP_PCF2127A rtc( p9, p10 );
+InterruptIn intr( p8 );
+BusOut leds( LED4, LED3, LED2, LED1 );
+
+void time_intr( void );
+void led_ctrl( void );
+
+int main() {
+ printf( "----------------- PCF2127 demo started.\r\n" );
+
+ leds = 1;
+
+ if ( rtc.is_init_required() ) {
+ lcd.locate( 0, 0 );
+ lcd.printf( "please set time from terminal" );
+
+ rtc.set_time();
+
+ lcd.cls();
+ }
+
+ intr.fall( &time_intr );
+
+ while ( 1 )
+ ;
+}
+
+
+void time_intr( void ) {
+ struct tm dt, *dtp;
+ time_t t;
+ char s[ 30 ];
+ dtp = &dt;
+
+ rtc.clear_intr();
+
+ t = rtc.time( NULL );
+ dtp = localtime( &t );
+
+ strftime( s, 30, "%H:%M:%S, %Y/%b/%d %a", dtp );
+ printf( "%s\r\n", s );
+
+ strftime( s, 20, "%H:%M:%S PCF2127", dtp );
+ lcd.locate( 0, 0 );
+ lcd.printf( "%s", s );
+
+ strftime( s, 20, "%Y/%b/%d(%a)", dtp );
+ lcd.locate( 0, 1 );
+ lcd.printf( "%s", s );
+
+ led_ctrl();
+}
+
+
+void led_ctrl( void )
+{
+ static char direction = true;
+
+ leds = direction ? leds << 1 : leds >> 1;
+ direction = (leds & 0x9) ? !direction : direction;
+}
+
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Sat Jun 05 02:18:50 2010 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/49a220cc26e0