NHD-0216CW-AB3 and an Arduino Micro
I'm having some (I think) timing/command issues with the NHD-0216CW-AB3 and an Arduino Micro.
I've attached a pic of the first character cut off on both lines and I'm at a loss.
I have seen different delay times used in various spots, some not having any. As well a different commands used for the same purpose (like 0xC0 vs 0xA0)
I've tried various delays and even commented some out. I don't see much of a difference. I'm a pretty green amateur at this stuff so any help would be greatly appericated!
Here is my code cobbled together from forum posts here, the us2066 git hub, the mouser ino sketch, and the datasheet example:
(try not to laugh at it ) :p
/* Setup for parallel 6800 mode
* nhd-0216CW-AB3 oled -> Arduino micro rev 3
* (us2066 controller)
*
* Data bits
* pin - name port - pin
* 7 (DB0) - portb 0 (ss pin used as digital 17)
* 8 (DB1) - portb 1 (sck pin used as digital 15)
* 9 (DB2) - portb 2 (mosi pin used as digital 16)
* 10 (DB3) - portb 3 (miso pin used as digital 14)
* 11 (DB4) - portb 4 (digital 8)
* 12 (DB5) - portb 5 (digital 9)
* 13 (DB6) - portb 6 (digital 10)
* 14 (DB7) - portb 7 (digital 11)
* Interface signal select
* pin - name port - pin
* 17 (BS0) - portd 0 - (digital pin 3) For 6800 8-bit parallel: 0
* 18 (BS1) - portd 1 - (digital pin 2) 0
* 19 (BS2) - portd 4 - (digital pin 4) 1
* Power supply
* pin - name pin
* 1 (VSS) - GND
* 2 (VDD) - 5V
* 3 (REGVDD) - 5V
* 20 (VSS) - GND
* Operation signals
* pin - name
* 4 - D/C - portf 0 (analog pin A5)
* 5 - R/W - portf 1 (analog pin A4)
* 6 - E - portf 4 (analog pin A3)
* 15 - /CS - portf 5 (analog pin A2)
* 16 - /RES - porff 6 (analog pin A1)
*
*Unused pins
* - portd 3 (digital pin 1) (tx)
* - portd 2 (digital pin 2) (rx)
* - portc 6 (digital pin 5)
* - portd 7 (digital pin 6)
* - porte 6 (digital pin 7)
* - portd 6 (digital pin 12)
* - portc 7 (digital pin 13)
* - portf 7 (analog pin A0)
*/
void setup() {
//B76543210 - most -> least
//DDRX sets output/input
//PORTX sets high/low
DDRD = B00010011; // bs2, bs1, bs0 are outputs.
DDRB = 0xFF; //Port b set to all output
DDRF = B01110011; // /res, /cs, e , r/w, d/c
PORTD = B00010000; // bs2 high, bs1 low, bs0 low: 6800 parallel 8-bit
PORTF = B01000000; // /res high (don't reset), /cs low (only 1 display), E, R/W low (always write), D/C
PORTB = 0x00;
delay(10); //delay
command(0x2A); //function set (extended command set)
command(0x71); //function selection A
data(0x5C); // Set 5V on REGVDD
command(0x28); //function set (fundamental command set)
command(0x08); //display off, cursor off, blink off
command(0x2A); //function set (extended command set)
command(0x79); //OLED command set enabled
command(0xD5); //set display clock divide ratio/oscillator frequency
command(0x70); //set display clock divide ratio/oscillator frequency
command(0x78); //OLED command set disabled
command(0x08); //extended function set (2‐lines)
command(0x06); //COM SEG direction
command(0x72); //function selection B
data(0x01); //ROM CGRAM selection (40? 00?)
command(0x2A); //function set (extended command set)
command(0x79); //OLED command set enabled
command(0xDA); //set SEG pins hardware configuration
command(0x10); //set SEG pins hardware configuration
command(0xDC); //function selection C
command(0x00); //function selection C
command(0x81); //set contrast control
command(0x7F); //set contrast control
command(0xD9); //set phase length
command(0xF1); //set phase length
command(0xDB); //set VCOMH deselect level
command(0x40); //set VCOMH deselect level
command(0x78); //OLED command set disabled
command(0x28); //function set (fundamental command set)
command(0x01); //clear display
delay(2);
command(0x80); //set DDRAM address to 0x00
command(0x0C); //display ON
delay(100); //delay
}
unsigned char text5[] = {"Newhaven Display"};
unsigned char text6[] = {" 2X16 Character "};
unsigned char text7[] = {" Slim Design "};
unsigned char text8[] = {"0123456789abcdef"};
void loop() {
command(0x01); //clear display
delay(2);
command(0x02); //return home
for(int i = 0; i < 16; i++){
data(text5[i]);
}
command(0xC0); //
for(int i = 0; i < 16; i++){
data(text6[i]);
}
delay(2000);
command(0x01);//clear display
delay(2);
command(0x02); //return home
for(int i = 0; i < 16; i++){
data(text7[i]);
}
command(0xC0);
for(int i = 0; i < 16; i++){
data(text8[i]);
}
delay(2000);
}
void command(unsigned char c){ //To send commands
PORTB = c; //command on port
PORTF &= B11111110; //D/C set to LOW for command
PORTF &= ~B00010000; //e high
delay(1);
PORTF |= B00010000; //e low
}
void data(unsigned char d){ //To send data
PORTB = d; //data on port
PORTF |= B00000001; //d/c high for data
PORTF &= ~B00010000; //e high
delay(1);
PORTF |= B00010000; //e low
}
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Got it working.
My first attempt I didn't use ports at all, got garbage output (used bitread to feed the data lines)
Found a post on here that recommend nothing but port registers. Faster? ok sounds good.
Finally remebered to try port register data and directwrite on everything else.
and bam. perfect output now.0 -
Glad to hear you are up and running!
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Oh, I forgot the 'why' part.
The full timing cycle (tCYCLE) is 400ns.
Port register manipulation is a lot faster than directwrite. (250ns vs 70042ns)
So,it would need timing delays to get it work right.0 -
Can you send the code you added to get this working?
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The change is to the data and command functions:
void command(unsigned char c){ //To send commands
PORTB = c; //command on port
digitalWrite(DC, LOW);
latch();
}
void data(unsigned char d){ //To send data
PORTB = d; //data on port
digitalWrite(DC, HIGH);
latch();
}in my original code you can see that it was all port manipulation, now it is a combination of ports and digitalwrites
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