msp430f5529olediic代码

以下是 MSP430F5529 和 OLED 屏幕之间的连接和基本 I2C 代码示例：

连接：

MSP430F5529 LaunchPad | SSD1306 OLED
------------ | -------------
P3.0 (I2C SDA) | SDA
P3.1 (I2C SCL) | SCL

代码：

#include <msp430.h>

#define SSD1306_WIDTH 128
#define SSD1306_HEIGHT 64
#define SSD1306_I2C_ADDRESS 0x3C

void delay(unsigned int t)
{
    while (t--)
        __delay_cycles(1000);
}

void i2c_init(void)
{
    // 配置 I2C 端口
    P3SEL |= BIT0 | BIT1;

    // 配置 I2C 控制寄存器
    UCB0CTL1 |= UCSWRST;
    UCB0CTL0 |= UCMST | UCMODE_3 | UCSYNC;
    UCB0CTL1 |= UCSSEL_2;
    UCB0BR0 = 80;
    UCB0BR1 = 0;
    UCB0I2CSA = SSD1306_I2C_ADDRESS;
    UCB0CTL1 &= ~UCSWRST;
}

void i2c_write(unsigned char data)
{
    // 开始传输
    UCB0CTL1 |= UCTR + UCTXSTT;

    // 等待传输完成
    while (!(UCB0IFG & UCTXIFG))
        ;

    // 发送数据
    UCB0TXBUF = data;

    // 等待传输完成
    while (!(UCB0IFG & UCTXIFG))
        ;

    // 结束传输
    UCB0CTL1 |= UCTXSTP;
}

void ssd1306_init(void)
{
    // 初始化 OLED
    i2c_write(0xAE); // 关闭显示
    i2c_write(0xD5); // 设置时钟分频因子
    i2c_write(0x80);
    i2c_write(0xA8); // 设置多路复用比率
    i2c_write(0x3F);
    i2c_write(0xD3); // 设置显示偏移
    i2c_write(0x00);
    i2c_write(0x40); // 设置显示开始行
    i2c_write(0x8D); // 设置电荷泵
    i2c_write(0x14);
    i2c_write(0x20); // 内存地址模式
    i2c_write(0x00);
    i2c_write(0xA1); // 段重定向设置
    i2c_write(0xC8); // 扫描方向设置
    i2c_write(0xDA); // 设置 COM 硬件引脚配置
    i2c_write(0x12);
    i2c_write(0x81); // 对比度设置
    i2c_write(0xCF);
    i2c_write(0xD9); // 设置预充电周期
    i2c_write(0xF1);
    i2c_write(0xDB); // VCOMH 电压倍率设置
    i2c_write(0x40);
    i2c_write(0xA4); // 关闭全局显示
    i2c_write(0xA6); // 设置显示方式
    i2c_write(0xAF); // 开启显示
}

void ssd1306_clear(void)
{
    unsigned char i, j;

    for (i = 0; i < 8; i++)
    {
        i2c_write(0xB0 + i); // 设置页地址
        i2c_write(0x00); // 设置列地址低位
        i2c_write(0x10); // 设置列地址高位
        for (j = 0; j < SSD1306_WIDTH; j++)
            i2c_write(0x00); // 清空一页数据
    }
}

void ssd1306_set_pos(unsigned char x, unsigned char y)
{
    i2c_write(0xB0 + y); // 设置页地址
    i2c_write(((x & 0xF0) >> 4) | 0x10); // 设置列地址高位
    i2c_write((x & 0x0F) | 0x00); // 设置列地址低位
}

void ssd1306_draw_pixel(unsigned char x, unsigned char y)
{
    ssd1306_set_pos(x, y);
    i2c_write(0x01);
}

void ssd1306_draw_line(unsigned char x1, unsigned char y1, unsigned char x2, unsigned char y2)
{
    unsigned char i, dx = x2 - x1, dy = y2 - y1;

    if (dx == 0)
    {
        for (i = 0; i <= dy; i++)
            ssd1306_draw_pixel(x1, y1 + i);
    }
    else if (dy == 0)
    {
        for (i = 0; i <= dx; i++)
            ssd1306_draw_pixel(x1 + i, y1);
    }
    else
    {
        float k = (float)dy / dx;

        if (k < 1)
        {
            for (i = 0; i <= dx; i++)
                ssd1306_draw_pixel(x1 + i, y1 + k * i);
        }
        else
        {
            for (i = 0; i <= dy; i++)
                ssd1306_draw_pixel(x1 + i / k, y1 + i);
        }
    }
}

int main(void)
{
    WDTCTL = WDTPW + WDTHOLD; // 关闭看门狗

    i2c_init(); // 初始化 I2C
    ssd1306_init(); // 初始化 OLED
    ssd1306_clear(); // 清空 OLED 屏幕

    ssd1306_draw_line(0, 0, 127, 63); // 在屏幕上绘制一条对角线

    while (1)
        ;

    return 0;
}