Help with DE-DP14112 (3216 BiColor LED Display from Sure Electronics)

Other Hardware LEDs and Multiplexing
1

Hi, I need a little help from some of you guys who managed to get this display working. I just want to make sure I am transmitting the right bit patterns for set-up. Right now, my display remains dim...

Basically, I initialize the display and then write &B0101 to address 0x7 of IC #1 (the first addressed HT1632C controller).

I know the RC Master Mode and Com Option are not necessary, as these are the same as the default power-up state. But it makes not difference weather I transmit them or not.

Here's what I send. I have verified these states using the LEDs on the output pins of my AVR microcontroller. I have also created a delay to make sure the the bit patterns don't toggle too fast on the port for the display to be clocked in.

Here's what I transmit in sequence. I am showing the 4 lines to the display and then the binary states on each line in time, so like a timing diagram (hope that makes sense): :~

Select All ICs: I set CS low and then provide 4 positive clock pulses on Clk
CS =100000000001
Clk=010101010100

Set Command ID (transmit 100): I bit-bang on the Data line 100 while clocking WR from 0-1 at every bit
Data=110000
WR =010101

Sys Enable: I bit-bang 0000000010 while clocking WR from 0-1
Data=000000000000001100
WR =010101010101010101

LED On: I bit-bang 000000110
Data=000000000000111100
WR =010101010101010101

RC Master Mode: I bit-bang 000110000
Data=000000111100000000
WR =010101010101010101

Com Option: I bit-bang 001000000
Data=000011000000000000
WR =010101010101010101

Duty Cycle (set to 10/16): I bit-bang 101010010
Data=110011001100001100
WR =010101010101010101

Lastly, I write binary data &B0101 to address 0x7 to the first IC just to see if I get anything on the display:

Select IC #1: I set CS low and then provide 2 positive clock pulses on Clk
CS =00111
Clk=01010

Set Write Data Command ID (transmit 101): I bit-bang on the Data line 101 while clocking WR from 0-1 at every bit
Data=110011
WR =010101

Write &B0101 to address 0x7: I bit bang 0000111 as address and right after it 0101 as data while clocking WR from 0-1 at every bit
Data=0000000011111100110011
WR =0101010101010101010101

Any clue? Have I missed anything?

Thanks in advance for any hints! :slight_smile:

2

Sorry, the bit patterns don't seem to line up. Hope it still makes sense...