====== lamaPLC: st756x display drivers ======
The ST7567 and ST7565 are the two most common "COV" (Chip-on-Glass) controllers for monochrome graphic LCDs. While they share the same basic command set, they represent different generations of hardware integration.
{{ :display:st7567a_1.png?150|ST7567 Display}}
|< 100%>|
^Feature^ST7565^ST7567|
^Release Era|Older (Legacy)|Newer (Current Standard)|
^External Caps|5–9 capacitors needed|0–2 capacitors needed|
^Default Bias|Usually 1/9 or 1/7|Usually 1/9|
^Interface|Parallel / SPI|Parallel / SPI / I²C|
^Power Consumption|Low|Ultra-Low|
^Best For|Heavy-duty industrial gear|Tiny DIY modules, I2C displays|
^Types|-|GM12864|

**Software Differences**

While they are "command compatible," you usually cannot swap them in code without minor tweaks:

  * **Initialization:** The ST7567 requires a specific //"Power Control"// command (0x2F) and //"Booster Ratio"// command (0xF8) that may differ in value from the ST7565.
  * **Contrast (Electronic Volume):** The range of contrast values varies; an ST7565 setting might make an ST7567 screen appear completely black or invisible.
  * **Addressing:** If you see a 4-pixel shift on your screen, you are likely using an ST7565 driver with an ST7567 chip (or vice versa), as their internal RAM start addresses can differ.

==== GM12864 ====
GM12864 refers to a family of 128x64-pixel graphical LCD and OLED display modules commonly used in Arduino and DIY electronics projects. The most frequent variant is the GM12864-59N, which features an I²C interface and a 2.14-inch screen

**Variants**
|< 100%>|
^Model^Interface^Driver^Type|
^GM12864-59N|I²C|ST7567S|LCD|
^GM12864-03A|SPI|ST7567|LCD|
^GM12864-01A|SPI|ST7567A|LCD (with COG panel)|
^GME12864-41|I²C/SPI|SSD1315|OLED|

**Note:** The I²C address is often ''0x3F'' or ''0x3C''. Users sometimes report issues with pre-installed zener diodes causing signal interference on some boards.
===== I²C topics on lamaPLC =====
{{topic>i2c}}

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{{tag>Display driver i2c SPI LCD COG OLED ST7565 ST7567 GM12864 GM12864-59N GM12864-03A GM12864-01A GME12864-41}}
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