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I2C GRAPHIC LCD FOR PICS?

 
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Aimar



Joined: 05 Mar 2007
Posts: 4

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I2C GRAPHIC LCD FOR PICS?
PostPosted: Tue Nov 06, 2007 8:22 am     Reply with quote
Hello everybody:

I'm trying to ue a BATRON I2C GRAPHIC LCD with a 16F88 PIC but as the datasheet is so bad and nobody has any experience with this one I was thinking to change by other one.

Any suggestion?


Thnks a lot.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Tue Nov 06, 2007 4:27 pm     Reply with quote
Post the complete part number of the LCD.
Aimar



Joined: 05 Mar 2007
Posts: 4

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PostPosted: Wed Nov 07, 2007 2:21 am     Reply with quote
The LCD is this one:


BATRON BT96040AV1 LCD 96x40 (STE200S controller)

I have got an AVER code supplyed for BATRON but it uses many libraries that I can't in CCS so I have been checking a litte part of code.

In this part I have a little problem, I don't know wht does the iic_command do to make a similar function in CCS.

/********** CODE *****************/

void init_LCD
{

int kont=0xc0;

iic_start();
iic_write(0x78); //Slave Adr
iic_command(0x38); // H1=0, H0=0
iic_command(0x0C); //normal mode
iic_command(0x3e); //func2_d
iic_command(0x08); //mux49
iic_command(0x3e); //func2_d
iic_command(0x02); //part disable
iic_command(0x3d); //func1_d
iic_command(kont); //vop+cont
iic_command(0x38); //func0_d
iic_command(0x05); //vlcd_range
iic_command(0x3d); //func1_d
iic_command(0x13); //bias
iic_command(0x3d); //func1_d
iic_command(0x05); //tc
iic_command(0x38); //func0_d
iic_command(0x12); //cp
iic_command(0x3d); //func1_d
iic_command(0x02); //v
iic_command(0x0c); //data mode
iic_command(0x3e); //func2_d
iic_command(0x06); //frame
iic_command(0x38);
iic_command(0x00);
iic_command(0x3b);
iic_command(0x01);
iic_command(0x38);
iic_command(0x02);
iic_stop();
}
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Wed Nov 07, 2007 1:45 pm     Reply with quote
Quote:
(STE200S controller)
I have got an AVER code supplyed for

It's the STE2004S controller and it's AVR code.
Accuracy is important in electronics.

Someone on this AVR forum says he has a working driver. It's posted
about halfway down this page:
http://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&t=53045

It could be translated to CCS. It has a special function called
"i2c_start_wait()". The AVR ASM code for that function is contained
in a file called i2c_master.zip, which is about halfway down this page:
http://homepage.hispeed.ch/peterfleury/avr-software.html
The function description is:
Quote:

void i2c_start_wait( unsigned char addr)

Issues a start condition and sends address and transfer direction.
If device is busy, use ack polling to wait until device ready

Parameters: addr
address and transfer direction of I2C device

Returns: none


Here is the ASM code for the function:
Code:

i2c_start_wait:
  mov __tmp_reg__,r24

i2c_start_wait1:
  sbi      SDA_DDR,SDA        ;force SDA low (do i2c start)
  rcall    i2c_delay_T2       ;delay T/2
 
  mov r24, __tmp_reg__
  rcall    i2c_write          ;send the address
 
  tst      r24                ;if device not busy -> done
  breq     i2c_start_wait_done
 
  rcall    i2c_stop           ;terminate write operation
  rjmp     i2c_start_wait1    ;device busy, poll ack again
i2c_start_wait_done:
  ret



Page 67 of this Microchip Tutorial on i2c describes ACK polling:
http://ww1.microchip.com/downloads/en/devicedoc/i2c.pdf
Referring to an eeprom, it says:
Quote:

When the EEPROM ACK’s the control byte, it is ready for new commands.
EEPROM will NACK data if busy, so test again.


Here is the CCS explanation of their i2c_write() function, with respect
to the returned value (ACK or NACK):
Quote:

i2c_write (data)
Parameters: data is an 8 bit int
Returns: This function returns the ACK Bit.
0 means ACK, 1 means NO ACK, 2 means there was a collision if in
multi-master mode.

This means that if the i2c_write() function returns a 1, we should stay
in the ACK polling loop.

Based on all this knowledge, we can now translate the AVR function
to CCS C source code. It could be written in a more compact way,
but this method allows you to easily see the translation from ASM:
Code:

void i2c_start_wait(int8 addr)
{
int8 ack_status;

while(1)
  {
   i2c_start();
   ack_status = i2c_write(addr);
   if(ack_status == 0)   // Did we get an ACK ?
      break;             // If so, exit loop
   i2c_stop();           // If got a NACK, remain in loop
  }

}


With this function, you should be able to translate the driver given on
the AVR page to CCS code.
jemly



Joined: 13 May 2007
Posts: 34

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BATRON LCD DISPLAY
PostPosted: Tue Mar 04, 2008 9:31 am     Reply with quote
Hi,

I'm just about to start work using a 96*40 dot BATRON display and came across this post. Did anyone finish getting the driver software written for this? Just wondering so I don't spend too much time 'reinventing the wheel!'

Thanks.
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