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TLC59731: SPI C-Code not working

Michael Demuth
Prodigy 20 points
Part Number: TLC59731
Other Parts Discussed in Thread: TLC5973

Hello,

I just need a simple code example to get one single TLC59731 going.

As I understand I just need to send for bytes via SPI:

void set_rgb_led(signed int8 red, signed int8 green, signed int8 blue)
  {
  spi_write(0x3a); // init
  spi_write(red); // red
  spi_write(green); // green
  spi_write(blue); // blue
  }

But this does actually work somehow: when I continuosly write values from a counter into the RGB values the LEDs turn sometimes on and off.

But I am not able to have any control.

So what is missing or wrong?

  • 0
    TI__Expert 4445 points
    Hi Michael,
    Could you post what the data you send out with the waveform?
    Thanks!
    Summer
  • 0 in reply to Summer SU
    Prodigy 20 points

    I just got it:

    unsigned int16 pTime = 1; // in useconds
    void writeRgbZero()
   {
   output_high(rgb_out);
   delay_us(pTime);
   output_low(rgb_out);
   delay_us(pTime);
   delay_us(pTime);
   delay_us(pTime);
   delay_us(pTime);
   delay_us(pTime);
   }


void writeRgbOne()
   {
   output_high(rgb_out);
   delay_us(pTime);
   output_low(rgb_out);
   delay_us(pTime);
   delay_us(pTime);
   output_high(rgb_out);
   delay_us(pTime);
   output_low(rgb_out);
   delay_us(pTime);
   delay_us(pTime);
   }
void writeRgData(unsigned int8 data) 
   {
   if (bit_test(data,7)) writeRgbOne();
   else writeRgbZero();
   if (bit_test(data,6)) writeRgbOne();
   else writeRgbZero();
   if (bit_test(data,5)) writeRgbOne();
   else writeRgbZero();
   if (bit_test(data,4)) writeRgbOne();
   else writeRgbZero();
   if (bit_test(data,3)) writeRgbOne();
   else writeRgbZero();
   if (bit_test(data,2)) writeRgbOne();
   else writeRgbZero();
   if (bit_test(data,1)) writeRgbOne();
   else writeRgbZero();
   if (bit_test(data,0)) writeRgbOne();
   else writeRgbZero();
}

void set_rgb_led(signed int8 red, signed int8 green, signed int8 blue)
  {
  writeRgbZero();
  writeRgbZero();
  writeRgbOne();
  writeRgbOne();
  writeRgbOne(); 
  writeRgbZero();
  writeRgbOne();
  writeRgbZero();
  
  writeRgData(red); // red
  writeRgData(green); // green
  writeRgData(blue); // blue
  delay_us(pTime);
  delay_us(pTime);
  delay_us(pTime);
  delay_us(pTime);
  }

    Some sample code would be very helpful in adition to the datasheet.....

  • 0 in reply to Michael Demuth
    TI__Expert 4445 points

    Hi Micheal,

        I am sorry we have no sample code in the hand, but could you download sample code from ti outside.

    hackster.io/alpcaner92/tlc5973-led-driver-msp432-with-bluetooth-02d2ad becasue there is free project with MSP432 and TLC5973.

    Any more concern please let me know, thanks!

    Summer

  • 0 in reply to Michael Demuth
    TI__Genius 14295 points
    Hi Michael,

    I'll close this thread due to inactivity.

    You can reply to this thread directly if you have more questions and it will open again.

    If you think this helps, please click "Resolve".

    Thanks.
    Regards,
    Kenneth