Replies: 12 comments 14 replies
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Do you mean st75256? How is your PCB configured related to the interface? |
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Thanks. Don't have the ST75256 yet; just trying to see which 4 pins of the 20 would be used re: clock, reset, RW/data/mosi, & chip select. Perhaps I should wait and see what connector the LCD arrives with, but from reading your notes there are only four of the 20 pins (besides power & ground) that need to be connected to Arduino: D13 (clock), D11 (RW/data/mosi), D10 (RS/chip select) & D8 (reset). Thanks again. |
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Arduino side is simple: You can use any pins (although I mostly use the above mentioned pins for Arduino). However the display controller expects certain signals at specific pins. I once created an overview:
Note, that there are three names for the Register Select line: In the datasheets you will find any of the three names, but they all mean the same, see also here: https://github.com/olikraus/u8g2/wiki/u8g2setupcpp#wiring This means: Do not get confused between CS and RS. They denote two different signals and both are required. When ordering your display, you usually need to order the display pre-configured for a specific interface (SPI, I2C, parallel, etc). |
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How the Elegoo LCD came pre-pinned ready to connect to the breadboard. Would this work for the ST75256 & ST7565? Thanks.
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Sure, if you apply the correct wiring. |
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Thank you tremendously. Will see how it goes when I get the device.
Will also need a larger board to run the u8g2 programs.
Thanks again, so very much appreciated.
Brent
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…------- Original Message -------
On Thursday, December 1st, 2022 at 2:14 PM, olikraus ***@***.***> wrote:
Arduino side is simple: You can use any pins (although I mostly use the above mentioned pins for Arduino). However the display controller expects certain signals at specific pins. I once created an overview:
https://github.com/olikraus/u8g2/blob/master/doc/controller_interface.txt
You controller is mentioned in line 25. This information is taken from the datasheet of the ST75256 and yes, you need to connect all three pins D1, D2 and D3 with the data line (MOSI).
Actually you need to connect five lines:
Description Suggested Arduino Pin Display Pin
SPI Clock D13 D0
MOSI D11 D1, D2, D3
Chip Select D10 CS
Register Select, Command/Data D9 A0 (RS)
Display Reset D8 RES
Not that there are three names for the Register Select line:
RS = A0 = DC
In the datasheets you will find any of the three names, but they all mean the same, see also here: https://github.com/olikraus/u8g2/wiki/u8g2setupcpp#wiring
This means: Do not get confused between CS and RS. They denote two different signals and both are required.
When ordering your display, you usually need to order the display pre-configured for a specific interface (SPI, I2C, parallel, etc).
If you have ordered a display, configured for parallel interface, but you want SPI, then some solder bridges need to be modified. In most cases there are hints regarding this on the PCB (look here for an example: https://github.com/olikraus/u8g2/wiki/gallery#20-jun-2021-uc1638-lg196962)
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When you send 3 different data lines from the LCD to 1 Arduino input does the Arduino MCU parse each data cache from each of the 3 data lines or is there a loss of complexity on the Arduino side of things?
Thanks.
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…------- Original Message -------
On Thursday, December 1st, 2022 at 2:14 PM, olikraus ***@***.***> wrote:
Arduino side is simple: You can use any pins (although I mostly use the above mentioned pins for Arduino). However the display controller expects certain signals at specific pins. I once created an overview:
https://github.com/olikraus/u8g2/blob/master/doc/controller_interface.txt
You controller is mentioned in line 25. This information is taken from the datasheet of the ST75256 and yes, you need to connect all three pins D1, D2 and D3 with the data line (MOSI).
Actually you need to connect five lines:
Description Suggested Arduino Pin Display Pin
SPI Clock D13 D0
MOSI D11 D1, D2, D3
Chip Select D10 CS
Register Select, Command/Data D9 A0 (RS)
Display Reset D8 RES
Not that there are three names for the Register Select line:
RS = A0 = DC
In the datasheets you will find any of the three names, but they all mean the same, see also here: https://github.com/olikraus/u8g2/wiki/u8g2setupcpp#wiring
This means: Do not get confused between CS and RS. They denote two different signals and both are required.
When ordering your display, you usually need to order the display pre-configured for a specific interface (SPI, I2C, parallel, etc).
If you have ordered a display, configured for parallel interface, but you want SPI, then some solder bridges need to be modified. In most cases there are hints regarding this on the PCB (look here for an example: https://github.com/olikraus/u8g2/wiki/gallery#20-jun-2021-uc1638-lg196962)
—
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You need to connect three pins from the display to one pin of the Arduino |
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Am using the breadboard to connect LCD ST75256 D1/D2/D3 to the same line and then connect then end of the line on the breadboard to Arduino D11; is this sufficient to combine the data from 3 pins into 1 Arduino pin? So far it is not working for me; perhaps there is some other problem that I can't see. Thanks. |
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Maybe. Did you connect the other pins auf the display as specified in the datasheet? |
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What does this mean? Thanks.
…--- do not connect
LHZ 3.3V, GND or unconnected
L/H connect to 3.3V or GND
3V3 connect to 3.3V
GND connect to ground (0V)
CLK SPI ClockDAT SPI Data
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------- Original Message -------
On Friday, December 2nd, 2022 at 9:34 AM, olikraus ***@***.***> wrote:
You need to connect three pins from the display to one pin of the Arduino
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I just quoted the information from the datasheet. Note: data is sent from Arduino to display |
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Yes I did, checking it twice & thrice. You mentioned a solder bridge for a parallel connection: have no idea if this is SPI or parallel. Thanks.
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On Thursday, December 22nd, 2022 at 11:32 AM, olikraus ***@***.***> wrote:
Maybe. Did you connect the other pins auf the display as specified in the datasheet?
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Well, then you need to figure out: There is no common suggestion or solution. The datasheet of your display should contain all the details. I could have a look on it, but you also didn't send a picture of your PCB. |
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It's ok. Thanks. Got it to flicker when the data arrives. It's the 20-pin data at the top of this discussion. |
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Sure, but the solder bridge are on the other side |
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[20221222_145808.jpg]
Thanks.
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…------- Original Message -------
On Thursday, December 22nd, 2022 at 12:01 PM, olikraus ***@***.***> wrote:
> have no idea if this is SPI or parallel.
Well, then you need to figure out: There is no common suggestion or solution. The datasheet of your display should contain all the details. I could have a look on it, but you also didn't send a picture of your PCB.
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I don't see an image here if you wanted to send one. |
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Sorry. Thanks. |
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Nice. As you can see, there are several solder Bridges. R3, R5 and R7 are closed with a 0 ohm resistor. This is S configuration, which probably means 4 wire SPI. |
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You could also post a picture of your complete wiring, so that we can crosscheck it here. |
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Pin 18 (D0) to Arduino D13 |
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Pin 5 is not required but you need 3.3V at pin 7. |
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Won't light-up with pin 7, only with pin 5. Everything is connected except the pins 1-4. Will look for a 1uF cap. Thanks. |
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pin 7 will light up the background LED (which is somehow irrelevant). |
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Thank you & thanks again for all your help with this.
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…------- Original Message -------
On Friday, December 23rd, 2022 at 3:56 PM, olikraus ***@***.***> wrote:
> Won't light-up with pin 7, only with pin 5.
pin 7 will light up the background LED (which is somehow irrelevant).
pin 5 will power up the graphics controller ST75256 of the display. Without the graphics controller you can only see some boring backlight.
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Which pin is Clock or RW, Data, mosi. Reset is 9. Chip Select is 8 or 10?
Thanks.
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