OLED显示方向算法调整方案

OLED显示算法调整

1 问题描述

	本次用的OLED 屏幕为SSD1317芯片驱动，96x96单色OLED。根据Datasheet上指令已经可以显示，但是方向不对。

== 该显示虽然没问题，但是和电路结合，方向很不方便，正常一般是有fpc的地方为下，本文章提供一种方案。先把调整好的图像放上。==

2 解决思路

	该屏幕显示设置了大小为96*12的缓冲，只要修改填充好的缓存，即可修改方向。
	为了修改方向，楼主的方案是将96*12字节的缓冲扩充 为96*96字节的bit缓冲，通过数组算法重新组合96*12的缓冲。
	本屏幕的显示模式为横向显示。

根据本屏幕的情况，算法如下：

static void Mem12_Cur96(void)
{
	uint8_t y, x, n;
	for (y = 0; y < 12; y++)
	{
		for (x = 0; x < 96; x++)
		{
			for (n = 0; n < 8; n++)
			{
				Mem[x + 96 * (n + y * 8)] = (CurrentMemory[y * 96 + x] >> n)
						& 0x01; 
			}
		}
	}
}

static void Mem96_Cur12(void)
{
	uint8_t y, x, n, num = 0;
	for (y = 0; y < 12; y++)
	{
		for (x = 0; x < 96; x++)
		{
			for (n = 0; n < 8; n++)
			{
				num |= (Mem[(95 - x) * 96 + 8 * y + n] << n);
			}
			CurrentMemory[(y) * 96 +  x] = num;
			num = 0;
		}
	}
}

---

该算法的主要是想就是明确两次转化关系，第一次扩充：

Mem[x + 96 * (n + y * 8)] = (CurrentMemory[y * 96 + x] >> n) & 0x01;
主要是把一个字节的每一位转化为8个数据。

第二次重新整理：

for (n = 0; n < 8; n++)
{
num |= (Mem[(95 - x) * 96 + 8 * y + n] << n);
}
CurrentMemory[(y) * 96 + x] = num;

---

3演示

成功旋转90度，但是旋转还是有问题，旋转错了方向。最后修改指令，修改参数，成功。

最后

粘上初始化代码：

static void Init_SSD1317(spi_device_handle_t spi)
{
	Oled_Write_Command(0xAE, spi); //Set Display Off
	Oled_Write_Command(0xD5, spi); //Display divide ratio/osc. freq. mode
	Oled_Write_Command(0xD1, spi); //
	Oled_Write_Command(0xA8, spi); //Multiplex ratio mode
	Oled_Write_Command(0x5F, spi);
	Oled_Write_Command(0xD3, spi); //Set Display Offset
	Oled_Write_Command(0x00, spi);
	Oled_Write_Command(0xA2, spi); //Set Display Start Line
	Oled_Write_Command(0x00, spi); //
	Oled_Write_Command(0xA1, spi); //Segment Re-map
	Oled_Write_Command(0xC8, spi); //Set COM Output Scan Direction
	Oled_Write_Command(0xDA, spi); //Common pads hardware: alternative
	Oled_Write_Command(0x12, spi);               //12
	Oled_Write_Command(0x20, spi); //Set memory addressing mode
	Oled_Write_Command(0x00, spi); //Horizontal Addressing Mode

	Oled_Write_Command(0xAD, spi); //Set Select external or internal IREF
	Oled_Write_Command(0x00, spi); //External IREF
	Oled_Write_Command(0x81, spi); //Contrast control
	Oled_Write_Command(0x9F, spi);
	Oled_Write_Command(0xD9, spi); //Set pre-charge period
	Oled_Write_Command(0x22, spi);
	Oled_Write_Command(0xDB, spi); //VCOM deselect level mode
	Oled_Write_Command(0x30, spi);
	Oled_Write_Command(0xA4, spi); //Set Entire Display On/Off
	Oled_Write_Command(0xA6, spi); //Set Normal Display
	OLED_Screen_Clear();
	Oled_Write_Command(0xAF, spi); //Set Display On
}

static void Mem12_Cur96(void)
{
	uint8_t y, x, n;
	for (y = 0; y < 12; y++)
	{
		for (x = 0; x < 96; x++)
		{
			for (n = 0; n < 8; n++)
			{
				Mem[x + 96 * (n + y * 8)] = (CurrentMemory[y * 96 + x] >> n)
						& 0x01;
			}
		}
	}
}

static void Mem96_Cur12(void)
{
	uint8_t y, x, n, num = 0;
	for (y = 0; y < 12; y++)
	{
		for (x = 0; x < 96; x++)
		{
			for (n = 0; n < 8; n++)
			{
				num |= (Mem[(95 - x) * 96 + 8 * y + n] << n);
			}
			CurrentMemory[(y) * 96 +  95 - x] = num;
			num = 0;
		}
	}

}

总结

楼主的办法有些消耗内存，如果大家有更好的办法，可以多多交流！