Diff: PCF85263AT.cpp

Revision:

0:fa906a89a756

--- /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;
+}