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Aimar
Joined: 05 Mar 2007
Posts: 4
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| I2C GRAPHIC LCD FOR PICS? |
 Posted: Tue Nov 06, 2007 8:22 am |
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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. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue Nov 06, 2007 4:27 pm |
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| Post the complete part number of the LCD. |
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Aimar
Joined: 05 Mar 2007
Posts: 4
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| Posted: Wed Nov 07, 2007 2:21 am |
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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();
} |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Wed Nov 07, 2007 1:45 pm |
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| 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
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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
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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.
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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
}
}
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With this function, you should be able to translate the driver given on
the AVR page to CCS code. |
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jemly
Joined: 13 May 2007
Posts: 34
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| BATRON LCD DISPLAY |
| Posted: Tue Mar 04, 2008 9:31 am |
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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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