Revision 0:47c63ed3af91, committed 2016-01-22

Comitter:

irsanjul

Date:

Fri Jan 22 08:50:40 2016 +0000

Commit message:

my prototype PCF8563's library

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/PCF8563.cpp	Fri Jan 22 08:50:40 2016 +0000
@@ -0,0 +1,118 @@
+#include "mbed.h"
+#include "PCF8563.h"
+
+extern Serial dbg;
+
+PCF8563::PCF8563(PinName sda, PinName scl) : pcf8563_i2c (sda, scl)
+{
+    pcf8563_i2c.frequency(PCF8563_FREQ);
+}
+
+time_t PCF8563::now()
+{
+    struct tm now;
+    char start = 0x02;
+    char buffer[7];
+    
+    if(pcf8563_i2c.write(W8563_ADDR, &start, 1) != 0) return 0;
+    if(pcf8563_i2c.read(R8563_ADDR, buffer, 7) != 0) return 0;
+    
+    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[5] & 0x1F) - 1;
+    now.tm_year = bcdToDecimal(buffer[6]) + 2000 - 1900;
+    
+    return mktime(&now);
+}
+
+bool PCF8563::set_time(time_t time)
+{
+    struct tm *now;
+    char buffer[8];
+    
+    now = localtime(&time);
+    
+    buffer[0] = 0x02; // memory address
+    buffer[1] = decimalToBcd(now->tm_sec) & 0x7F; // VL = 0
+    buffer[2] = decimalToBcd(now->tm_min) & 0x7F;
+    buffer[3] = decimalToBcd(now->tm_hour) & 0x3F;
+    buffer[4] = now->tm_wday + 1;
+    buffer[5] = decimalToBcd(now->tm_mday) & 0x3F;
+    buffer[6] = decimalToBcd(now->tm_mon+1) & 0x1F;
+    buffer[7] = decimalToBcd(now->tm_year + 1900 - 2000);
+    
+    if(pcf8563_i2c.write(W8563_ADDR, buffer, 9) != 0) return 0;
+    
+    return true;
+}
+
+bool PCF8563::set_alarm(time_t time)
+{
+    struct tm *now;
+    char buffer[5];
+    
+    now = localtime(&time);
+    
+    buffer[0] = 0x09; // memory address
+    buffer[1] = decimalToBcd(now->tm_min) & 0x80;
+    buffer[2] = decimalToBcd(now->tm_hour) & 0x80;
+    buffer[3] = decimalToBcd(now->tm_mday) & 0x80;
+    buffer[4] = (now->tm_wday + 1) & 0x80;
+    if(pcf8563_i2c.write(W8563_ADDR, buffer, 4) != 0) return 0;
+    
+    char Int[2];
+    Int[0] = 0x01; // control address
+    Int[1] = 0x02; // set AIE to 1 for INT pin
+    if(pcf8563_i2c.write(W8563_ADDR, Int, 2) != 0) return 0;
+    
+    return true;
+}
+
+bool PCF8563::alarmOff()
+{
+    char start = 0x01;
+    char buffer;
+    
+    if(pcf8563_i2c.write(W8563_ADDR, &start, 1) != 0) return 0;
+    //if(pcf8563_i2c.read(R8563_ADDR, buffer, 1) != 0) return 0;
+    
+    pcf8563_i2c.start();
+    pcf8563_i2c.write(R8563_ADDR);
+    buffer = pcf8563_i2c.read(0);
+    pcf8563_i2c.stop();
+    
+    buffer = buffer - 0x08; // clear AF to turn off alarm
+    
+    char send[2];
+    send[0] = 0x01; //control 1 address
+    send[1] = buffer;
+    if(pcf8563_i2c.write(W8563_ADDR, send, 2) != 0) return 0;
+    
+    return true;
+}
+
+bool PCF8563::check_alarm()
+{
+    char start = 0x01;
+    char buffer;
+    
+    if(pcf8563_i2c.write(W8563_ADDR, &start, 1) != 0) return 0;
+    //if(pcf8563_i2c.read(R8563_ADDR, buffer, 1) != 0) return 0;
+    
+    pcf8563_i2c.start();
+    pcf8563_i2c.write(R8563_ADDR);
+    buffer = pcf8563_i2c.read(0);
+    pcf8563_i2c.stop();
+    
+    buffer = buffer & 0x08;
+    if(buffer == 0x08)
+    {
+        dbg.printf("== ALARM ON ==\r\n");
+        wait_ms(200);
+        
+        alarmOff();
+    }
+    return true;
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/PCF8563.h	Fri Jan 22 08:50:40 2016 +0000
@@ -0,0 +1,61 @@
+#ifndef PCF8563_H
+#define PCF8563_H
+
+#define W8563_ADDR     0xA2    // I2C address for write
+#define R8563_ADDR     0xA3    // I2C address for read
+#define PCF8563_FREQ     400000  // bus speed 400 kHz
+
+class PCF8563
+{
+public:
+    PCF8563(PinName sda, PinName scl);
+
+    /** Read current real time from PCF8563
+     *
+     * @returns
+     *   current time on success,
+     *   0 on error (I2C fail, clock not set)
+     */
+    time_t now();
+    
+    /** Write current real time to PCF8563
+     *
+     * @param time Real time to set up
+     * @returns
+     *   true on success,
+     *   false on error (I2C fail)
+     */
+    bool set_time(time_t time);
+    
+    /** Write alarm time to PCF8563
+     * @param time is set time for alarm
+     * @returns
+     *    true on success,
+     *    false on error
+     */
+    bool set_alarm(time_t time);
+    
+    /**
+     */
+    bool alarmOff();
+    
+    /**
+     */
+    bool check_alarm();
+    
+    /**
+     */
+    
+private:
+    I2C pcf8563_i2c;
+
+    static int bcdToDecimal(int bcd) {
+        return ((bcd & 0xF0) >> 4) * 10 + (bcd & 0x0F);
+    }
+
+    static int decimalToBcd(int dec) {
+        return (dec % 10) + ((dec / 10) << 4);
+    }
+};
+
+#endif