LCD power OFF ON

Projects Programming
1

After downloading the program the screen is blank, I have to turn power OFF and ON to see texts ?

#include "ST7565.h"
//ST7565 glcd(SDA, SCL, DC, RST, CS5)
ST7565 glcd(PB7, PB6, PB5, PB4, PB3);
void setup()   {
 //glcd.begin(0);// glcd.begin(10);, glcd.begin(brightness);
  glcd.begin(0);
 delay(10);
}
void loop()
{
  glcd.clear();
  glcd.drawstring(0, 1, "TEST  23434 45675");
  glcd.display();
}
2

Can you post a schematic of your setup please?

Are all grounds connected together?
What LCD do you have, can you post a link to that please?

It sounds to me like something like a reset connection you have missed connecting up on the LCD.

3

ST7565 [https://www.aliexpress.com/item/1005004706328499.html?

stm32f103 , SDA= PB7, SCL = PB6

st7565
st7565490×532 202 KB

stm32f103 reset button is not working

4

So I will take the answer to this as no.

If you want help then please post a schematic. The bit of a picture you posted isn't even a schematic.

5

bloop
bloop490×532 202 KB

6

st7565 b
st7565 b1132×964 119 KB

7

I know with a lot of these screens you have to turn on the backlight to get the screen to work.
you should try,

#define BACKLIGHT_LED 4

Setup()
pinMode(BACKLIGHT_LED, OUTPUT);
digitalWrite(BACKLIGHT_LED, LOW);

9

Thanks it is working. Now I am trying to use PB10 and PB11 instead of PB6 and PB7 , but it is not working.


#include "ST7565.h"
/////////////////
#include <Wire.h>
TwoWire Wire2(PB11, PB10);
/////////////////
//ST7565 glcd(SDA, SCL, DC, RST, CS5)
ST7565 glcd(PB7, PB6, PB5, PB4, PB3);
void setup()   {
  
  Wire2.begin();
  Wire2.setClock(400000);
 
  glcd.begin(0);
 delay(10);
}
void loop()
{
  glcd.clear();
  glcd.drawstring(0, 1, "TEST  23434 45675 6");
  glcd.display();
}
10

Don't you have a conflict with your pin assignments?

You have TwoWire Wire2 seems to be using those 2 pins(PB10,PB11)

11

Yes I have, even if I change this line

ST7565 glcd(PB7, PB6, PB5, PB4, PB3);

to

ST7565 glcd(PB11, PB10, PB5, PB4, PB3);


#include "ST7565.h"
/////////////////
#include <Wire.h>
TwoWire Wire2(PB11, PB10);
/////////////////
//ST7565 glcd(SDA, SCL, DC, RST, CS5)
ST7565 glcd(PB11, PB10, PB5, PB4, PB3);
void setup()   {
  
  Wire2.begin();
  Wire2.setClock(400000);
 
  glcd.begin(0);
 delay(10);
}
void loop()
{
  glcd.clear();
  glcd.drawstring(0, 1, "TEST  23434 45675 6");
  glcd.display();
}
12

You lost me here.
You're using an SPI screen and doing something with I2C?
Maybe you should explain what you are trying to accomplish with your project and then maybe it will make more sense.

13

In stm32f103 there are 3 I2C, the LCD is working on default pins PB6 and PB7, I am trying to remap them to PB10 and PB11

pb
pb720×346 219 KB

14

You can't use the same pins for both I2C and the SPI lines, they are not the same thing.

Pins marked SCL1 SDA1, and SCL2, SDA2, and SCL3, SDA3 in the pale grey colour are I2C lines.

The purple colored labels marked SCK1 and SCK 2 are the clock lines for the SPI interface, along with the MOSI, MISO, data lines and the NSS ( the device select that needs to be driven low to select the device)

15

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