Add a function for determining day of week from calendar date and rename dayofweek to day like in datasheet.

2 files changed, 9 insertions, 4 deletions

diff --git a/ds3231.c b/ds3231.c
index c7cd797..b70a09b 100755
--- a/ds3231.c
+++ b/ds3231.c
@@ -24,6 +24,10 @@ int DEC_2_BCD(int to_convert) {
     return ((to_convert / 10) << 4) + (to_convert % 10);

 }

 

+unsigned int Get_DayOfWeek(unsigned int y, unsigned int m,  unsigned int d) {

+    return (d += m < 3 ? y-- : y - 2, 23*m/9 + d + 4 + y/4- y/100 + y/400)%7 + 1; // 01 - 07, 01 = Sunday

+}

+

 void Read_Alarms_Temp() {

     I2C_Master_Start(); // Start I2C

     I2C_Master_Write(0xD0); // RTC chip address

@@ -59,11 +63,11 @@ void Set_Date() {
     I2C_Master_Stop();

 }

 

-void Set_DayOfWeek() {

+void Set_DayOfWeek(int dow) {

     I2C_Master_Start(); // Start I2C

     I2C_Master_Write(0xD0); // RTC Chip address

     I2C_Master_Write(3); // send register address

-    I2C_Master_Write(dayOfWeek); //update day of week

+    I2C_Master_Write(dow); //update day of week

     I2C_Master_Stop();

 }

 

@@ -89,7 +93,7 @@ void Update_Current_Date_Time() {
     sec = BCD_2_DEC(I2C_Master_Read(1)); // Read sec from register 00h

     min = BCD_2_DEC(I2C_Master_Read(1)); // Read min from register 01h

     hour = BCD_2_DEC(I2C_Master_Read(1)); // Read hour from register 02h

-    weekday = I2C_Master_Read(1); // Read day from register 03h

+    day = I2C_Master_Read(1); // Read day from register 03h

     date = BCD_2_DEC(I2C_Master_Read(1)); // Read date from register 04h

     month = BCD_2_DEC(I2C_Master_Read(1)); // Read month from register 05h

     year = BCD_2_DEC(I2C_Master_Read(1)); // Read year from register 06h

diff --git a/ds3231.h b/ds3231.h
index c6a326a..3131310 100755
--- a/ds3231.h
+++ b/ds3231.h
@@ -2,9 +2,10 @@
 

 int BCD_2_DEC(int);

 int DEC_2_BCD(int);

+unsigned int Get_DayOfWeek(unsigned int, unsigned int,  unsigned int);

 void Read_Alarms_Temp(void);

 void Set_Date(void);

-void Set_DayOfWeek(void);

+void Set_DayOfWeek(int);

 void Set_Time(void);

 void Update_Current_Date_Time(void);

 void Write_Alarms(void);
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