AVR-Chat

anyone ever married an Atmega32 to a Dallas RTC?



	
		
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Yes I have.
I started with a "AT90S2313 Development Board" from Futurlec. And moved up
to the "ATMega(32) Development Board" from the same. They both use a DS1307
on the I2C buss. It has 56 bytes of ram and is battery backup.
I also have an IO expander (MPC23016) on the same buss. But it is not pretty
when the Avr is talking to the RTC and the MCP interrupts.
I used software I2C and Bascom.

JoeT

-----Original Message-----
From: Nunya [mailto:dactie2000@yahoo.com]
Sent: Tuesday, June 08, 2004 8:39 PM
To: AVR-Chat@yahoogroups.com
Subject: [AVR-Chat] Atmega and Dallas RTC


anyone ever married an Atmega32 to a Dallas RTC?

You need a status flag or state byte.

If one interrupt happens while the other is active, you
wait to service the request until the first task is
complete.

Jim Wagner

On Wed, 9 Jun 2004 23:59:47 -0500
 "joseph torelli" <joetorelli@intergate.com> wrote:
> 
> 
> 
> 
> Yes I have.
> I started with a "AT90S2313 Development Board"
> from Futurlec. And moved up
> to the "ATMega(32) Development Board" from the
> same. They both use a DS1307
> on the I2C buss. It has 56 bytes of ram and is battery
> backup.
> I also have an IO expander (MPC23016) on the same buss.
> But it is not pretty
> when the Avr is talking to the RTC and the MCP
> interrupts.
> I used software I2C and Bascom.
> 
> JoeT
> 
> -----Original Message-----
> From: Nunya [mailto:dactie2000@yahoo.com]
> Sent: Tuesday, June 08, 2004 8:39 PM
> To: AVR-Chat@yahoogroups.com
> Subject: [AVR-Chat] Atmega and Dallas RTC
> 
> 
> anyone ever married an Atmega32 to a Dallas RTC?
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
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At 11:35 AM 6/10/2004 -0400, James Wagner wrote:

>You need a status flag or state byte.
>
>If one interrupt happens while the other is active, you
>wait to service the request until the first task is
>complete.


>> I also have an IO expander (MPC23016) on the same buss.
>> But it is not pretty
>> when the Avr is talking to the RTC and the MCP
>> interrupts.
>> I used software I2C and Bascom.


Why would you not just CLI while the RTC is in progress, and SEI when it's done?