Example program EX_RTCLK

[Aryan]

Hi,

This example came along with CCS compilor to read and write an external real time clock ds1302 using a keypad and LCD.

I am a bit confused with the code in this example EX_RTCLK.C .In this example the pin connections of ds1302 with the circuit is as follows

#define RTC_SCLK PIN_B1
#define RTC_RST PIN_B2

#define RTC_CE PIN_D0
#define RTC_IO PIN_D1
#define RTC_CLK PIN_D2
#define RTC_DATA PIN_D3

Can anyone pls advice what is the difference between RTC_SCLK and RTC_CLK. The driver example ds1302.c says the the real time clock to be connected according to following.

#define RTC_SCLK PIN_B1
#define RTC_IO PIN_B3
#define RTC_RST PIN_B2

I have connected ds1302 on port D on the pins as follows
#define RTC_CE PIN_D0
#define RTC_IO PIN_D1
#define RTC_CLK PIN_D2
#define RTC_DATA PIN_D3

Am I connecting it correctly?? The display I am getting by connecting ds1302 this way is as follows

FF/FF/FF
FF:FF:FF

Please can anyone advice
1) Which is the correct way of connecting the ds1302 ?
2) Why am I getting the erronous results by connecting the way I have done.

Regards
Aryan

[Guest]

You should be using RTC_SCLK. You can either modify your #define or rewire.

#define RTC_SCLK PIN_D2

[Aryan]

[Guest]

You did this in the EX_RTCLK.C file right? What ever is in the ds1302 driver file is not used since it is defined in the EX_RTCLK.C from the #ifndef.

[Guest]

By the way, do you have a crystal hooked up to the ds1302? Have you tested it to make sure it is running (oscilloscaope)?

[Guest]

another problem I see is that the RTC_RCT is no set right. RTC_CE = RTC_RST. Change RTC_RST in the EX_RTCLK.C to:

#define RTC_RST PIN_D0

[Aryan]

[DragonPIC]

welcome....
_________________
-Matt