编写DHT11和OLED驱动代码

以下是DHT11和OLED驱动代码的示例：

DHT11驱动代码：

#include <msp430.h>

#define DHT11_PIN BIT4

void DHT11_Start(void)
{
    P4DIR |= DHT11_PIN;  //设置P4.4为输出
    P4OUT &= ~DHT11_PIN; //使P4.4输出低电平
    __delay_cycles(18000);  //延时18ms
    P4OUT |= DHT11_PIN;  //使P4.4输出高电平
    __delay_cycles(40);  //延时40us
    P4DIR &= ~DHT11_PIN;  //设置P4.4为输入
}

int DHT11_Check_Response(void)
{
    int response = 0;
    __delay_cycles(40);  //延时40us
    if(!(P4IN & DHT11_PIN))  //判断是否为低电平响应
    {
        __delay_cycles(80);  //延时80us
        if(P4IN & DHT11_PIN)  //判断是否为高电平响应
        {
            response = 1;
        }
    }
    while(P4IN & DHT11_PIN);  //等待低电平结束
    return response;
}

void DHT11_Read_Data(int *data, int pin)
{
    int i, j = 0;
    for(i=0; i<5; i++)
    {
        data[i] = 0;
    }
    DHT11_Start();  //发送开始信号
    if(DHT11_Check_Response())  //等待响应
    {
        for(i=0; i<40; i++)
        {
            while(!(P4IN & DHT11_PIN));  //等待高电平开始位
            __delay_cycles(30);  //延时30us
            if(P4IN & DHT11_PIN)  //判断是否为高电平数据位
            {
                j |= (1<<(7-(i%8))); //将数据存入j中
            }
            if(i%8 == 7)
            {
                data[i/8] = j;
                j = 0;
            }
        }
    }
}

OLED驱动代码：

#include <msp430.h>

#define OLED_SCL BIT7
#define OLED_SDA BIT6
#define OLED_RST BIT5
#define OLED_DC BIT4

void OLED_Write_Command(unsigned char command)
{
    UCB1IFG &= ~UCRXIFG;  //清除接收标志位
    UCB1TXBUF = command;  //写入命令
    while(!(UCB1IFG & UCTXIFG));  //等待发送完成
}

void OLED_Write_Data(unsigned char data)
{
    UCB1IFG &= ~UCRXIFG;  //清除接收标志位
    UCB1TXBUF = data;  //写入数据
    while(!(UCB1IFG & UCTXIFG));  //等待发送完成
}

void OLED_Init(void)
{
    P4DIR |= OLED_RST;  //设置P4.5为输出
    P4OUT &= ~OLED_RST; //使P4.5输出低电平
    __delay_cycles(20000);  //延时20ms
    P4OUT |= OLED_RST;  //使P4.5输出高电平
    __delay_cycles(20000);  //延时20ms

    UCB1CTLW0 |= UCSWRST;  //软件复位UCB1模块
    UCB1CTLW0 |= UCMST + UCMODE_3 + UCSYNC;  //主模式，3线SPI，同步通信
    UCB1CTLW0 |= UCSSEL_2;  //时钟源选择SMCLK
    UCB1BRW = 0x02;  //时钟分频为SMCLK/2
    UCB1CTLW0 &= ~UCSWRST;  //释放UCB1模块
    P4DIR |= OLED_SCL + OLED_SDA + OLED_DC;  //设置OLED引脚为输出
    OLED_Write_Command(0xAE);  //关闭OLED显示
    OLED_Write_Command(0xD5);  //设置时钟分频因子
    OLED_Write_Command(0x80);  //时钟分频因子为80h
    OLED_Write_Command(0xA8);  //设置显示偏移
    OLED_Write_Command(0x3F);  //偏移量为3Fh
    OLED_Write_Command(0xD3);  //设置显示开始行
    OLED_Write_Command(0x00);  //开始行为0
    OLED_Write_Command(0x40);  //设置显示位置
    OLED_Write_Command(0x8D);  //设置电荷泵
    OLED_Write_Command(0x14);  //开启电荷泵
    OLED_Write_Command(0x20);  //设置内存地址模式
    OLED_Write_Command(0x02);  //地址模式为页寻址模式
    OLED_Write_Command(0xA1);  //设置段重定向
    OLED_Write_Command(0xC8);  //设置COM扫描方向
    OLED_Write_Command(0xDA);  //设置COM硬件引脚配置
    OLED_Write_Command(0x12);  //设置COM引脚配置
    OLED_Write_Command(0x81);  //设置对比度控制
    OLED_Write_Command(0xCF);  //对比度为CFh
    OLED_Write_Command(0xD9);  //设置预充电周期
    OLED_Write_Command(0xF1);  //预充电周期为F1h
    OLED_Write_Command(0xDB);  //设置VCOMH
    OLED_Write_Command(0x40);  //VCOMH为40h
    OLED_Write_Command(0xA4);  //关闭全局显示开启
    OLED_Write_Command(0xA6);  //设置正常显示模式
    OLED_Write_Command(0xAF);  //开启OLED显示
}

void OLED_Set_Pos(unsigned char x, unsigned char y)
{
    OLED_Write_Command(0xB0 + y);  //设置页地址（0~7）
    OLED_Write_Command(((x & 0xf0) >> 4) | 0x10);  //设置高位列地址
    OLED_Write_Command((x & 0x0f) | 0x01);  //设置低位列地址
}

void OLED_ShowString(unsigned char x, unsigned char y, char *str)
{
    unsigned char c = 0;
    while(str[c] != '\0')
    {
        OLED_ShowChar(x, y, str[c]);
        x += 8;
        c++;
    }
}

void OLED_ShowChar(unsigned char x, unsigned char y, unsigned char chr)
{
    unsigned char c = 0, i = 0;
    c = chr - 32;
    if(x > 120)
    {
        x = 0;
        y++;
    }
    OLED_Set_Pos(x, y);
    for(i=0; i<8; i++)
    {
        OLED_Write_Data(OLED_ASCII[c][i]);
    }
}

注：这里的OLED_ASCII数组为OLED显示的ASCII码对应点阵，需要根据具体OLED屏幕型号进行调整。