原创 【电子DIY设计】+基于HarmonyOS的OLED显示屏

    }

    data[(buff_size - 1) * 2] =

OLED

_CTRL_DATA;

OLED

_SendData(data, sizeof(data));

}

设定当前位置，我们为了设定显示位置，所以需要设置指针的位置。

void

OLED

_SetCursor(uint8_t x, uint8_t y) {

OLED

.CurrentX = x;

OLED

.CurrentY = y;

}

显示字符串

char

OLED

_DrawString(char* str, FontDef Font,

OLED

_COLOR color) {

    while (*str) {

        if (

OLED

_DrawChar(*str, Font, color) != *str) {

            return *str;

        }

        str++;

}

    return *str;

}

在屏幕缓冲区中绘制一个像素

；（也就是绘制一个像素点）

void

OLED

_DrawPixel(uint8_t x, uint8_t y,

OLED

_COLOR color) {

    if(x >=

OLED

_WIDTH || y >=

OLED

_HEIGHT) {

        return;

    }

    if(

OLED

.Inverted) {

        color = (

OLED

_COLOR)!color;

    }

    if(color == White) {

OLED

_Buffer[x + (y / 8) *

OLED

_WIDTH] |= 1 << (y % 8);

    } else {

OLED

_Buffer[x + (y / 8) *

OLED

_WIDTH] &= ~(1 << (y % 8));

    }

}

绘制区域

void

OLED

_DrawRegion(uint8_t x, uint8_t y, uint8_t w, uint8_t h, const uint8_t* data, uint32_t size, uint32_t stride)

{

    if (x + w >

OLED

_WIDTH || y + h >

OLED

_HEIGHT || w * h == 0) {

        printf("%dx%d @ %d,%d out of range or invalid!\r\n", w, h, x, y);

        return;

    }

    w = (w <=

OLED

_WIDTH ? w :

OLED

_WIDTH);

    h = (h <=

OLED

_HEIGHT ? h :

OLED

_HEIGHT);

    stride = (stride == 0 ? w : stride);

    uint8_t rows = size * 8 / stride;

    for (uint8_t i = 0; i < rows; i++) {

        uint32_t base = i * stride / 8;

        for (uint8_t j = 0; j < w; j++) {

            uint32_t idx = base + (j / 8);

            uint8_t byte = idx < size ? data[idx] : 0;

            uint8_t bit  = byte & (0x80 >> (j % 8));

OLED

_DrawPixel(x + j, y + i, bit ? White : Black);

        }

    }

}

显示中文

首先我们需要对文字取模，有很多取模工具，这里就不做介绍。这里着重介绍软件实现显示中文的效果。character数组存放汉字取模后的16进制数，这里选用字大小为16*16的，所以W和H都赋值为16，二维数组大小设定为32；

void

Oled

Chinese(void)

{

    const uint32_t W = 16, H = 16;

    uint8_t character[][32] = {

        {

           0x40,0x20,0x30,0x48,0x10,0xFC,0x02,0x88,0x9F,0xA8,0x64,0x88,0x24,0xA8,0x04,0x90,

           0x14,0x84,0x14,0xFE,0xE7,0x04,0x3C,0x24,0x29,0xF4,0x20,0x04,0x20,0x14,0x20,0x08,

        },{

           0x04,0x48,0x7F,0xFC,0x04,0x40,0x7F,0xFE,0x40,0x02,0x8F,0xE4,0x00,0x00,0x7F,0xFC,

           0x06,0x10,0x3B,0x30,0x05,0xC0,0x1A,0xA0,0x64,0x90,0x18,0x8E,0x62,0x84,0x01,0x00,

        },{

          0x01,0x00,0x21,0x08,0x21,0x08,0x3F,0xF8,0x22,0x28,0x22,0x20,0xFF,0x7C,0x22,0x44,

          0x22,0xA8,0x22,0x20,0x3E,0x20,0x22,0x20,0x22,0x50,0x22,0x48,0x3E,0x8E,0x21,0x04,

        },{

          0x04,0x00,0x02,0x00,0x01,0x00,0x01,0x00,0x01,0x00,0x02,0x80,0x02,0x80,0x02,0x80,

          0x04,0x40,0x04,0x40,0x08,0x20,0x08,0x20,0x10,0x10,0x20,0x10,0x40,0x0E,0x80,0x04,

        },

        {

            0x00,0x80,0x00,0xA0,0x00,0x90,0x00,0x84,0xFF,0xFE,0x00,0x80,0x00,0x80,0x3E,0x80,

            0x08,0x80,0x08,0x40,0x08,0x40,0x09,0x20,0x0E,0x22,0x70,0x12,0x20,0x0A,0x00,0x04

        }

    };

OLED

_Fill(Black);

    for (size_t i = 0; i < sizeof(character)/sizeof(character[0]); i++) {

OLED

_DrawRegion(i * W, 0, W, H, character, sizeof(character[0]), W);