Revision 13:10e564536e23, committed 2015-03-08

Comitter:

charly

Date:

Sun Mar 08 21:12:29 2015 +0000

Parent:

12:88f82e47b6a1

Commit message:

added Methods for reading and manipulating (inc/dec) the Calibration-Register of RTC

Changed in this revision

diff -r 88f82e47b6a1 -r 10e564536e23 Rtc_Mcp97410.cpp
--- a/Rtc_Mcp97410.cpp	Fri Jan 16 21:17:52 2015 +0000
+++ b/Rtc_Mcp97410.cpp	Sun Mar 08 21:12:29 2015 +0000
@@ -232,6 +232,74 @@
     }
 }
 
+
+uint8_t Rtc_Mcp97410::readTrim()
+{
+    uint8_t  trim;
+    if (readRTC(ADDR_CAL, (char *) &trim, 1)) {
+        INFO("OSCTRIM: %02X \n", trim);
+        return trim;
+    } else {
+        return 0;
+    }
+}
+
+bool Rtc_Mcp97410::incTrim()
+{
+    uint8_t  trim;
+    uint8_t  trim_val;
+    uint8_t  trim_sign;
+
+    readRTC(ADDR_CAL, (char *) &trim, 1);
+    trim_val = 0x7F&trim;
+    trim_sign= trim >> 7;
+    if (trim_sign == 1) {
+        // positive: inc
+        if (trim_val < 0x7F) {
+            trim_val = trim_val++;
+        }
+    } else {
+        // negative: dec
+        if (trim_val != 0) {
+            trim_val = trim_val--;
+        } else {
+            // change sign
+            trim_sign = 1;
+        }
+    }
+    trim = trim_sign <<7 | trim_val;
+    INFO("incTrim: New TRIM: %02X\n", trim);
+    return writeRTC(ADDR_CAL, (char *) &trim, 1);
+}
+
+bool Rtc_Mcp97410::decTrim()
+{
+    uint8_t  trim;
+    uint8_t  trim_val;
+    uint8_t  trim_sign;
+
+    readRTC(ADDR_CAL, (char *) &trim, 1);
+    trim_val = 0x7F&trim;
+    trim_sign= trim >> 7;
+    if (trim_sign == 0) {
+        // negative: inc
+        if (trim_val < 0x7F) {
+            trim_val = trim_val++;
+        }
+    } else {
+        // positive: dec
+        if (trim_val != 0) {
+            trim_val = trim_val--;
+        } else {
+            // change sign
+            trim_sign = 0;
+        }
+    }
+    trim = trim_sign <<7 | trim_val;
+    INFO("decTrim: New TRIM: %02X\n", trim);
+    return writeRTC(ADDR_CAL, (char *) &trim, 1);
+}
+
 bool Rtc_Mcp97410::disableEEPROMWrite()
 {
     // protect all EEPROM from write operations
@@ -280,7 +348,7 @@
     // write 0x55 and then 0xAA to the EEUNLOCK-register
     char reg =0x00;
     bool result = true;
-    
+
     reg = 0x55;
     result &= writeRTC(ADDR_ULID,&reg,1);
     reg = 0xAA;

diff -r 88f82e47b6a1 -r 10e564536e23 Rtc_Mcp97410.h
--- a/Rtc_Mcp97410.h	Fri Jan 16 21:17:52 2015 +0000
+++ b/Rtc_Mcp97410.h	Sun Mar 08 21:12:29 2015 +0000
@@ -223,8 +223,29 @@
     */
     bool disableEEPROMWrite();    
 
-
+    /** read the OSCTRIM-Register (0x08)
+    *
+    * -127 .. +127
+    * bit 7 is Sign
+    * bit 0:6 Trim-Value
+    */
+    uint8_t readTrim();
+    
+    /** Increment TRIM-Value
+    *
+    * Increment TRIM-Value by one 
+    */
+    bool incTrim();
+    
+    /** Derement TRIM-Value
+    *
+    * Decrement TRIM-Value by one 
+    */
+    bool decTrim();
+    
+       
     /** read from EEPROM
+    *
     * address from 0x00 to 0x7F
     * all 128 Bytes can be read in one chunk
     *
@@ -237,6 +258,7 @@
     bool readEEPROM(int address, char* buffer, int len);
     
     /** write to EEPROM
+    *
     * address from 0x00 to 0x7F
     * only maximum 8 Bytes can be written in one chunk
     *