u8g2lib驱动SSD1322屏幕刷新慢的解决方法

在构造器中优先选择带HW的

class U8G2_SSD1322_NHD_256X64_F_2ND_4W_HW_SPI : public U8G2 {
  public: U8G2_SSD1322_NHD_256X64_F_2ND_4W_HW_SPI(const u8g2_cb_t *rotation, uint8_t cs, uint8_t dc, uint8_t reset = U8X8_PIN_NONE) : U8G2() {
    u8g2_Setup_ssd1322_nhd_256x64_f(&u8g2, rotation, u8x8_byte_arduino_2nd_hw_spi, u8x8_gpio_and_delay_arduino);
    u8x8_SetPin_4Wire_HW_SPI(getU8x8(), cs, dc, reset);
  }
};

其实和SPI还有WIRE库的关系不大

#include <Arduino.h>
#include <U8g2lib.h>
#include <SPI.h>
#include <Wire.h>

#define SCREEN_WIDTH 256
#define SCREEN_HEIGHT 64

//U8G2_SSD1322_NHD_256X64_F_4W_SW_SPI display(U8G2_R0, /* clock=*/ 18, /* data=*/ 19, /* cs=*/ 17, /* dc=*/ 15, /* reset=*/ 14);
U8G2_SSD1322_NHD_256X64_F_4W_HW_SPI display(U8G2_R0,  /* cs=*/ 17, /* dc=*/ 15, /* reset=*/ 14);
//U8G2_SSD1322_NHD_256X64_F_2ND_4W_HW_SPI display(U8G2_R0, /* clock=*/ 18, /* data=*/ 19, /* cs=*/ 17, /* dc=*/ 15, /* reset=*/ 14);
// 'logo', 256x64px
//logo区域 看着眼晕

SetBusClock应该在begin之前

void setup(void) 
{
  display.setBusClock(150000000);
  display.begin();
  //display.setPowerSave(0);
}

构造器的规则。

    构造器的名字包括以下几方面：

No	Description	Example
1	Prefix	U8G2
2	Display Controller	SSD1306
3	Display Name	128X64_NONAME
4	Buffer Size	1, 2 or F (full frame buffer)
5	Communication	4W_SW_SPI

    它们之间使用"_"连接起来。其中：

• BufferSize，缓存大小

BufferSize	Description
1	保持一页的缓冲区，用于firstPage/nextPage的PageMode.
2	保持两页的缓冲区，用于firstPage/nextPage的PageMode..
F	获取整个屏幕的缓冲区，ram消耗大，一般用在ram空间比较大的arduino板子.

• Communication，通信协议

Communication	Description
4W_SW_SPI	4-wire (clock, data, cs and dc) software emulated SPI
4W_HW_SPI	4-wire (clock, data, cs and dc) hardware SPI (based on Arduino SPI library)
2ND_4W_HW_SPI	If supported, second 4-wire hardware SPI (based on Arduino SPI library)
3W_SW_SPI	3-wire (clock, data and cs) software emulated SPI
SW_I2C	Software emulated I2C/TWI
HW_I2C	Hardware I2C based on the Arduino Wire library
2ND_HW_I2C	If supported, use second hardware I2C (Arduino Wire lib)
6800	8-bit parallel interface, 6800 protocol
8080	8-bit parallel interface, 8080 protocol

• Rotation （软件模拟总线前提下的构造器的第一个参数）

Rotation/Mirror	Description
U8G2_R0	No rotation, landscape
U8G2_R1	90 degree clockwise rotation
U8G2_R2	180 degree clockwise rotation
U8G2_R3	270 degree clockwise rotation
U8G2_MIRROR	No rotation, landscape, display content is mirrored (v2.6.x)