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04/05/07 15:41
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 		 #136690 - Stuck in no ACK
Responding to: ???'s previous message
Asif Ali said:
It really worked and now i have came to know that the MCu is stucked in Ack, well sir (its my habit to say sir), well does any one know that how to over come that ACK ?

the code is this
Save This Code

ACK:        SETB SDA
BACK:       SETB SCK
            JB SDA,LEDX     ;if SDA is high then go to LEDX LABEL
EXIT:       CLR SCK         ;if SDA is low then clear the SCK
            RET	            ;Go back
LEDX:       CLR LED         ;Clear the LED pin for tracking
            SJMP BACK       ;Go back to BACK and check it again


DareDevil



Dear Asif,

You never want to sit in a loop waiting for ACK. If the eeprom does not want to ACK you, then you let higher code handle it. The most common cause is that the bus was busy, or the eeprom did not get addressed (ie did not respond to the 0xA0 address).

By all means use an LED to show what is happening, but just let it set/clr the LED and then bring your CLK low and return. Let your calling code handle the no_ACK situation.

David

List of 74 messages in thread
TopicAuthorDate
How To Write the Data to EEPROM (Seial)            01/01/70 00:00      
   Slow the i2c clock            01/01/70 00:00      
      Well i am using 12 MHz with 8051            01/01/70 00:00      
         Speed            01/01/70 00:00      
         this is upon you to determine            01/01/70 00:00      
   the poor developer's "logic analyzer"....            01/01/70 00:00      
   What happens in the real hardware?            01/01/70 00:00      
      writing IS broken - but in several ways            01/01/70 00:00      
         I I Sir, i will use spaces for next, :-)            01/01/70 00:00      
            delay for write plus the real error            01/01/70 00:00      
      Sir i'v used P1 to see that data is written or not            01/01/70 00:00      
         Order of magnitude!            01/01/70 00:00      
         is it 100kHz or 1000kHz?            01/01/70 00:00      
      I dont have osciloscop :-(            01/01/70 00:00      
   In real world the P1 is High,            01/01/70 00:00      
   Code Comments            01/01/70 00:00      
      again "I I SIR", well sir i have got your Point,            01/01/70 00:00      
         to Asif (and others)            01/01/70 00:00      
   I2C Part number ...            01/01/70 00:00      
   Even the NOPs and delay wont working            01/01/70 00:00      
   I have Codded this in C,But still not working :-(            01/01/70 00:00      
      not a good idea            01/01/70 00:00      
      Asif,s C Code for I2C            01/01/70 00:00      
         You missed the point            01/01/70 00:00      
            Point taken            01/01/70 00:00      
   are you sure they are IIC, not SMB            01/01/70 00:00      
      To be very Honest i dont know tha its IIC or SMB            01/01/70 00:00      
         try this            01/01/70 00:00      
   Have you looked here?            01/01/70 00:00      
      Working code...            01/01/70 00:00      
         advice to Asif            01/01/70 00:00      
            i know that i dont have to Copy Paste,, :-)            01/01/70 00:00      
               WoW i have EEPROM Programmer,            01/01/70 00:00      
                  is it working at all?            01/01/70 00:00      
            What about the A0, A1... pins on the 24C04            01/01/70 00:00      
   Well sir Here are Comparision of C and ASM(My Way)            01/01/70 00:00      
      I few I2C questions            01/01/70 00:00      
         it is not uncommon to list IIC addresses this way,            01/01/70 00:00      
            I was askin for schematics...            01/01/70 00:00      
               Here is the Schematics,            01/01/70 00:00      
                  Pardon??            01/01/70 00:00      
                     Well sir it means this ckt is Dummy            01/01/70 00:00      
                        OK            01/01/70 00:00      
                           Well i am straight forward programmer :-)            01/01/70 00:00      
                           Well the Hardware Circuit is Exactly same as it.            01/01/70 00:00      
                              Not at all!            01/01/70 00:00      
                     Recheck it Sir i have added labels, :-)            01/01/70 00:00      
                        but            01/01/70 00:00      
                        and blinkey?            01/01/70 00:00      
                           It really worked :-) MCu is stucked at ACK            01/01/70 00:00      
                              Stuck at ACK            01/01/70 00:00      
                              Stuck in no ACK            01/01/70 00:00      
                                 Sorry i havent understood, forgive my dumbness            01/01/70 00:00      
                                    Stuck in ACK (Reminds me of work)            01/01/70 00:00      
                                    Still Stuck?            01/01/70 00:00      
                                       Sir i am gonna use the Acknowledge polling tech:-)            01/01/70 00:00      
                                          one note            01/01/70 00:00      
                                             Nice note:-) but it Clocking was wrong,            01/01/70 00:00      
                                       Sir i am gonna use the Acknowledge polling tech:-)            01/01/70 00:00      
   Here is working Code, :-)            01/01/70 00:00      
      for your benefit and others            01/01/70 00:00      
         Havent Gotten your Idea ?            01/01/70 00:00      
            The idea is            01/01/70 00:00      
               WoW i have Gotten the IDEA , thanks            01/01/70 00:00      
   The Problem Solved Successfully,Thanks everybody            01/01/70 00:00      
      You have the code working now            01/01/70 00:00      
         Thanks David            01/01/70 00:00      
         Partially agree            01/01/70 00:00      
            100% agreed            01/01/70 00:00      
            I was rying to help !!            01/01/70 00:00      
               true and untrue            01/01/70 00:00      
                  C Loops are not Perfect, agreed            01/01/70 00:00      
                  C timing loops            01/01/70 00:00      
                     then don't call it C            01/01/70 00:00      

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