irsan julfikar
test rtc
Revision 0:fa906a89a756, committed 2020-06-17
- Comitter:
- irsanjul
- Date:
- Wed Jun 17 08:46:25 2020 +0000
- Commit message:
- test rtc
Changed in this revision
| PCF85263AT.cpp | Show annotated file Show diff for this revision Revisions of this file |
| PCF85263AT.h | Show annotated file Show diff for this revision Revisions of this file |
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/PCF85263AT.cpp Wed Jun 17 08:46:25 2020 +0000
@@ -0,0 +1,128 @@
+#include "mbed.h"
+#include "PCF85263AT.h"
+
+extern Serial dbg;
+
+PCF85263AT::PCF85263AT(PinName sda, PinName scl) : i2c (sda, scl)
+{
+ i2c.frequency(100000);
+}
+
+PCF85263AT::~PCF85263AT()
+{
+
+}
+
+bool PCF85263AT::write(char adr, char data)
+{
+ w[0] = adr;
+ w[1] = data;
+ if (i2c.write(address, w, 2) != 0) return 0;
+
+ return true;
+}
+
+char PCF85263AT::read(char adr)
+{
+ char start = adr;
+ if (i2c.write(address, &start, 1, true) != 0) return 0;
+ if (i2c.read(address, r, 1) != 0) return 0;
+
+ return r[0];
+}
+
+time_t PCF85263AT::now()
+{
+ struct tm now;
+
+ char buffer[6];
+
+ buffer [0] = read(SEC);
+ buffer [1] = read(MIN);
+ buffer [2] = read(HOUR);
+ buffer [3] = read(DAY);
+ buffer [4] = read(MONTH);
+ buffer [5] = read(YEAR);
+
+ now.tm_sec = bcdToDecimal(buffer[0] & 0x7F);
+ now.tm_min = bcdToDecimal(buffer[1] & 0x7F);
+ now.tm_hour = bcdToDecimal(buffer[2] & 0x3F);
+ now.tm_mday = bcdToDecimal(buffer[3] & 0x3F);
+ now.tm_mon = bcdToDecimal(buffer[4] & 0x1F) - 1;
+ now.tm_year = bcdToDecimal(buffer[5] & 0xFF) + 2000 - 1900;
+
+ return mktime(&now);
+}
+
+bool PCF85263AT::set_time(time_t time)
+{
+ struct tm *now;
+ char buffer[9];
+
+ now = localtime(&time);
+
+ // send stop signal
+ buffer[0] = 0x01;
+ if(!write(STOPEN, buffer[0]))return 0;
+
+ // clear prescaler
+ buffer[0] = 0xA4;
+ if(!write(RESET, buffer[0]))return 0;
+
+ // set time
+ buffer[0] = decimalToBcd(now->tm_sec) & 0x7F; // VL = 0
+ buffer[1] = decimalToBcd(now->tm_min) & 0x7F;
+ buffer[2] = decimalToBcd(now->tm_hour) & 0x3F;
+ buffer[3] = decimalToBcd(now->tm_mday) & 0x3F;
+ buffer[4] = now->tm_wday + 1;
+ buffer[5] = decimalToBcd(now->tm_mon+1) & 0x1F;
+ buffer[6] = decimalToBcd(now->tm_year + 1900 - 2000);
+
+ if(!write(SEC, buffer[0]))return 0;
+ if(!write(MIN, buffer[1]))return 0;
+ if(!write(HOUR, buffer[2]))return 0;
+ if(!write(DAY, buffer[3]))return 0;
+ if(!write(WDAY, buffer[4]))return 0;
+ if(!write(MONTH, buffer[5]))return 0;
+ if(!write(YEAR, buffer[6]))return 0;
+
+ // clear stop signal
+ buffer[0] = 0x00;
+ if(!write(STOPEN, buffer[0]))return 0;
+
+ return true;
+}
+
+bool PCF85263AT::IsConnected()
+{
+ bool ok = false;
+
+ i2c.start();
+ i2c.stop();
+
+ if (i2c.read(address, &data[0], 1) != 0)
+ {
+// dbg.printf("PCF85263AT is not detected\r\n");
+ ok = false;
+ }
+ else
+ {
+// dbg.printf("PCF85263AT is detected\r\n");
+ ok = true;
+ }
+
+ data[0] = 0;
+ i2c.start();
+ i2c.stop();
+
+ return ok;
+}
+
+bool PCF85263AT::software_reset()
+{
+ char buffer = 0x2C;
+
+ if(!write(RESET, buffer)) return 0;
+
+ return 1;
+}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/PCF85263AT.h Wed Jun 17 08:46:25 2020 +0000
@@ -0,0 +1,83 @@
+#ifndef PCF85263AT_H
+#define PCF85263AT_H
+
+#include "mbed.h"
+
+#define address 0xA2
+
+class PCF85263AT
+{
+public:
+
+ enum RegisterName
+ {
+ // Time and Date Register | Bit 7 | Bit 6 | Bit 5 | Bit 4 | Bit 3 | Bit 2 | Bit 1 | Bit 0 |
+ MSEC = 0x00, // Mili Second | ( 0 - 99 ) |
+ SEC = 0x01, // Second | OS | ( 0 - 59 ) |
+ MIN = 0x02, // Minute | EMON | ( 0 - 59 ) |
+ HOUR = 0x03, // Hour | X | X | AM/PM | ( 1 - 12 ) |
+ // Hour | X | X | ( 0 - 23 ) |
+ DAY = 0x04, // Day | X | X | ( 1 - 31 ) |
+ WDAY = 0x05, // Day of week | X | X | X | X | X | ( 0 - 6 ) |
+ MONTH = 0x06, // month | X | X | X | ( 1 - 12 ) |
+ YEAR = 0x07, // year | ( 0 - 99 ) |
+
+ // Alarm1 register
+ SECALARM = 0x08, // Second1 | X | ( 0 - 59 ) |
+ MINALARM = 0x09, // Minute1 | X | ( 0 - 59 ) |
+ HOURALARM = 0x0A, // Hour1 | X | X | AM/PM | ( 1 - 12 ) |
+ // Hour1 | X | X | ( 0 - 23 ) |
+ DAYALARM = 0x0B, // Day | X | X | ( 1 - 31 ) |
+ MONALARM = 0x0C, // Day of week | X | X | X | ( 1 - 12 ) |
+
+ // Alarm2 register
+ MINALARM2 = 0x0D, // Minute1 | X | ( 0 - 59 ) |
+ HOURALARM2 = 0x0E, // Hour1 | X | X | AM/PM | ( 1 - 12 ) |
+ WDAYALARM2 = 0x0F, // Day | X | X | X | X | X | ( 0 - 6 ) |
+
+ // RTC Alarm Enable
+ ALARMEN = 0x10, // Alarm Enable |WDAY2E | HR2E | MIN2E | MON1E | DAYE | HR1E | MIN1E | SEC1E |
+
+ // OFFSET Register
+ OFFSET = 0x24, // Offset | [7:0] |
+
+ // CONTROL REGISTER
+ OSCI = 0x25, // Oscilator | CLKIV | OFFM | 12_24 | LOWJ | OSCD[1:0] | CL[1:0] |
+ BTRSW = 0x26, // BatterySwitch| X | X | X | BSOFF | BSRR | BSM[1:0] | BSTH |
+ PINIO = 0x27, // Pin I/O | CLKPM | TSPULL| TSL | TSIM | TSPM[1:0] | INTAPM[1:0] |
+ FUNCT = 0x28, // Fungtion | 100TH | PI [2:0] | RTCM | STOPM | COF[2:0] |
+ FLAG = 0x2B, // Flags | PIF | A2F | A1F | WDF | BSF | TSR3F | TSR2F | TSR1F |
+
+ // STOP
+ STOPEN = 0x2E, // Stop Enable | X | X | X | X | X | X | X | STOP |
+
+ // RESET
+ RESET = 0x2F // Reset RTC | CPR | 0 | 1 | 0 | SR | 1 | 0 | CTS |
+ };
+
+ bool write(char adr, char data);
+ char read(char adr);
+ time_t now();
+ bool set_time(time_t time);
+ bool IsConnected();
+ bool software_reset();
+
+ PCF85263AT(PinName sda, PinName scl);
+ ~PCF85263AT();
+
+private:
+ I2C i2c;
+ char data[64];
+ char w[32];
+ char r[32];
+
+ static int bcdToDecimal(int bcd) {
+ return ((bcd & 0xF0) >> 4) * 10 + (bcd & 0x0F);
+ }
+
+ static int decimalToBcd(int dec) {
+ return (dec % 10) + ((dec / 10) << 4);
+ }
+};
+
+#endif // PCF85263AT_H