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driving of module

 
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Christophe



Joined: 10 May 2005
Posts: 323
Location: Belgium

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driving of module
PostPosted: Tue May 17, 2005 3:24 am     Reply with quote
Hello,

http://expand.xs4all.nl/uploadarchief/download.do?file=CELL_V6_15.pdf

This is the datasheet of the module I need to drive (it is a braille-cell - makes blind people able to read).

I wanted to know if I can use the SPI module for driving this? And if yes, what is the configuration of it?
ckielstra



Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands

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PostPosted: Tue May 17, 2005 5:40 am     Reply with quote
Your circuit uses 10 data bits while SPI uses 8 data bits, this makes it impossible to use SPI.

Writing your own function to output this data is very easy:
Code:

#define CLOCK_PIN   PIN_B1
#define DATA_PIN    PIN_B2
#define STROBE_PIN  PIN_B3

write_braille(int16 Data)
{
  int8 i;

  for (i=0; i<10; i++)
  {
    // Output data bit
    if ( bit_test(Data, i) )
      output_high(DATA_PIN);
    else
      output_low(DATA_PIN);
   
    delay_us(1);

    // Clock pulse
    output_high(CLOCK_PIN);
    delay_us(1);
    output_low(CLOCK_PIN);
  }

  // Strobe pulse
  delay_us(1);
  output_high(STROBE_PIN);
  delay_us(1);
  output_low(STROBE_PIN);
}

main()
{
  // Initialize outputs
  output_low(CLOCK_PIN);
  output_low(DATA_PIN);
  output_low(SROBE_PIN);
 
  write_braille(0x101);
  write_braille(0x102);
  write_braille(0x103);

  while(TRUE)
    ; // loop forever
}
Christophe



Joined: 10 May 2005
Posts: 323
Location: Belgium

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PostPosted: Tue May 17, 2005 6:51 am     Reply with quote
heel erg bedankt! I'm sure I can use this.. The only thing is that I don't really know how to drive the cells :-s
The producer gives very few information
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