msp430f5529olediic代码
时间: 2023-07-09 13:45:37 浏览: 132
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:
```c
#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;
}
```
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