Switching TLC5927 to Special Mode for Current Limiting changes

Using Arduino LEDs and Multiplexing
#1

Greeting all,

I’ve gotten my TLC5927 to work using the SPI library. However, getting it to go into Special Mode is a problem. You need to toggle the Output enable and Latch lines, and it doesn’t look like the SPI library is set up for this. So I wrote it by toggling these line with digitalWrite. No luck. Looks like a lot of people are using the TLC5927, can someone show me some code for for this. I want to set the current limiting.

Thanks,
Theron Wierenga

Code attached.

void SetBrightness()
{
  digitalWrite(cs1, LOW);
  delayMicroseconds(1);
  digitalWrite(oe1, HIGH);
  delayMicroseconds(1);
   
  digitalWrite(cs1, LOW);
  digitalWrite(oe1, HIGH);
  digitalWrite(clk, HIGH);    // Clk 1
  delayMicroseconds(1);
  digitalWrite(clk, LOW);
  digitalWrite(oe1, LOW);
  delayMicroseconds(1);
   
  digitalWrite(clk, HIGH);    // Clk 2
  delayMicroseconds(1);
  digitalWrite(clk, LOW);
  digitalWrite(oe1, HIGH);
  delayMicroseconds(1);
   
  digitalWrite(clk, HIGH);    // Clk 3
  delayMicroseconds(1);
  digitalWrite(clk, LOW);
  digitalWrite(cs1, HIGH);
  delayMicroseconds(1);
   
  digitalWrite(clk, HIGH);    // Clk 4
  delayMicroseconds(1);
  digitalWrite(clk, LOW);
  digitalWrite(cs1, LOW);
  delayMicroseconds(1);
   
  digitalWrite(clk, HIGH);    // Clk 5
  delayMicroseconds(1);
  digitalWrite(clk, LOW);
  delayMicroseconds(1);
   
//  digitalWrite(51, HIGH);
//  
//  for (int i = 0; i < 14; i++)
//  {
//    digitalWrite(clk, HIGH);
//   delayMicroseconds(1);
//  digitalWrite(clk, LOW);
//   delayMicroseconds(1);
//  }
//  
//   digitalWrite(cs1, HIGH);
//   delayMicroseconds(1);
//   digitalWrite(clk, HIGH);    // Clk 15
//   delayMicroseconds(1);
//  digitalWrite(clk, LOW);
//  digitalWrite(cs1, LOW);
//   delayMicroseconds(1);

   
     SPI.transfer(0x00); 
     SPI.transfer(0x00);
   
   // end data
   
  digitalWrite(clk, HIGH);    // Clk 1
  delayMicroseconds(1);
  digitalWrite(clk, LOW);
  digitalWrite(oe1, LOW);
  delayMicroseconds(1);
   
  digitalWrite(clk, HIGH);    // Clk 2
  delayMicroseconds(1);
  digitalWrite(clk, LOW);
  digitalWrite(oe1, HIGH);
  delayMicroseconds(1);
   
  digitalWrite(clk, HIGH);    // Clk 3
  delayMicroseconds(1);
  digitalWrite(clk, LOW);
  delayMicroseconds(1);
   
  digitalWrite(clk, HIGH);    // Clk 4
  delayMicroseconds(1);
  digitalWrite(clk, LOW);
  delayMicroseconds(1);
   
  digitalWrite(clk, HIGH);    // Clk 5
  delayMicroseconds(1);
  digitalWrite(clk, LOW);
  delayMicroseconds(1);
}
#2