void OLED_display_on(void) { oled_write_byte(0x8d, OLED_CMD); oled_write_byte(0x14, OLED_CMD); oled_write_byte(0xaf, OLED_CMD); } void OLED_display_off(void) { oled_write_byte(0x8d, OLED_CMD); oled_write_byte(0x10, OLED_CMD); oled_write_byte(0xae, OLED_CMD);

这段代码是用于 OLED 显示屏控制的。其中，OLED_display_on() 函数用于打开 OLED 显示屏，而 OLED_display_off() 函数则用于关闭 OLED 显示屏。

具体来说，OLED_display_on() 函数通过向 OLED 显示屏发送三个命令字节，分别为 0x8d、0x14 和 0xaf，来打开 OLED 显示屏。其中，第一个命令字节为设置 DC-DC 电源模式/开关电源模式，第二个命令字节为设置 DC-DC 电源输出电压，第三个命令字节为打开 OLED 显示屏。

而 OLED_display_off() 函数则通过向 OLED 显示屏发送三个命令字节，分别为 0x8d、0x10 和 0xae，来关闭 OLED 显示屏。其中，第一个命令字节和第二个命令字节与 OLED_display_on() 函数相同，第三个命令字节为关闭 OLED 显示屏。

相关问题

使用stm32f103c8t6和ZE08甲醛传感器建立联系，同时使用SPI通信的OLED模块显示甲醛浓度，传感器接PB10和11，OLED接PA5和7传输数据，程序设计

以下是使用stm32f103c8t6和ZE08甲醛传感器建立联系，同时使用SPI通信的OLED模块显示甲醛浓度的程序设计：

#include "stm32f10x.h"

#define OLED_DC_Pin GPIO_Pin_5
#define OLED_DC_Port GPIOA
#define OLED_CS_Pin GPIO_Pin_7
#define OLED_CS_Port GPIOA

void OLED_GPIO_init(void);
void OLED_write_cmd(unsigned char command);
void OLED_write_data(unsigned char data);
void OLED_init(void);
void OLED_show_str(unsigned char x, unsigned char y, unsigned char *str);

void SPI1_init(void);
void SPI1_send_byte(unsigned char byte);
unsigned char SPI1_receive_byte(void);

void USART2_init(void);
void USART2_send_byte(unsigned char byte);

void delay_ms(unsigned int ms);

int main(void)
{
    unsigned char buf[10];
    float concentration;
    unsigned char str[10];

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB, ENABLE);

    OLED_GPIO_init();
    OLED_init();

    SPI1_init();

    USART2_init();

    while(1)
    {
        GPIO_ResetBits(GPIOB, GPIO_Pin_10);
        delay_ms(1000);
        SPI1_send_byte(0xFF);
        buf[0] = SPI1_receive_byte();
        buf[1] = SPI1_receive_byte();
        buf[2] = SPI1_receive_byte();
        buf[3] = SPI1_receive_byte();
        GPIO_SetBits(GPIOB, GPIO_Pin_10);

        concentration = ((buf[0] * 256) + buf[1]) / 1000.0;
        sprintf((char *)str, "%.2f mg/m3", concentration);
        OLED_show_str(0, 1, str);

        USART2_send_byte(buf[0]);
        USART2_send_byte(buf[1]);
        USART2_send_byte(buf[2]);
        USART2_send_byte(buf[3]);
        USART2_send_byte('\n');

        delay_ms(5000);
    }
}

void OLED_GPIO_init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    GPIO_InitStructure.GPIO_Pin = OLED_DC_Pin | OLED_CS_Pin;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
}

void OLED_write_cmd(unsigned char command)
{
    GPIO_ResetBits(OLED_DC_Port, OLED_DC_Pin);
    GPIO_ResetBits(OLED_CS_Port, OLED_CS_Pin);
    SPI1_send_byte(command);
    GPIO_SetBits(OLED_CS_Port, OLED_CS_Pin);
}

void OLED_write_data(unsigned char data)
{
    GPIO_SetBits(OLED_DC_Port, OLED_DC_Pin);
    GPIO_ResetBits(OLED_CS_Port, OLED_CS_Pin);
    SPI1_send_byte(data);
    GPIO_SetBits(OLED_CS_Port, OLED_CS_Pin);
}

void OLED_init(void)
{
    OLED_write_cmd(0xAE); // display off
    OLED_write_cmd(0x20); // addressing mode
    OLED_write_cmd(0x10); // horizontal addressing mode
    OLED_write_cmd(0xb0); // set page start address
    OLED_write_cmd(0xc8); // set COM output scan direction
    OLED_write_cmd(0x00); // set low column address
    OLED_write_cmd(0x10); // set high column address
    OLED_write_cmd(0x40); // set start line address
    OLED_write_cmd(0x81); // set contrast control register
    OLED_write_cmd(0xff); // set contrast to maximum
    OLED_write_cmd(0xa1); // set segment re-map 95 to 0
    OLED_write_cmd(0xa6); // set normal display
    OLED_write_cmd(0xa8); // set multiplex ratio
    OLED_write_cmd(0x3f); // 1/64 duty
    OLED_write_cmd(0xa4); // display all on/resume to display
    OLED_write_cmd(0xd3); // set display offset
    OLED_write_cmd(0x00); // not offset
    OLED_write_cmd(0xd5); // set display clock divide ratio/oscillator frequency
    OLED_write_cmd(0xf0); // set divide ratio
    OLED_write_cmd(0xd9); // set pre-charge period
    OLED_write_cmd(0x22); // set pre-charge period
    OLED_write_cmd(0xda); // set COM pins hardware configuration
    OLED_write_cmd(0x12);
    OLED_write_cmd(0xdb); // set vcomh
    OLED_write_cmd(0x20); // 0.77xVcc
    OLED_write_cmd(0x8d); // set charge pump enable/disable
    OLED_write_cmd(0x14); // enable charge pump
    OLED_write_cmd(0xaf); // turn on oled panel
}

void OLED_show_str(unsigned char x, unsigned char y, unsigned char *str)
{
    unsigned char i, j;

    for(i = 0; str[i] != '\0'; i++)
    {
        for(j = 0; j < 6; j++)
        {
            OLED_write_data(F6x8[(str[i] - 32) * 6 + j]);
        }
    }
}

void SPI1_init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    SPI_InitTypeDef SPI_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOB, &GPIO_InitStructure);

    SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
    SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
    SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
    SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
    SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
    SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
    SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;
    SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
    SPI_Init(SPI1, &SPI_InitStructure);

    SPI_Cmd(SPI1, ENABLE);
}

void SPI1_send_byte(unsigned char byte)
{
    while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);
    SPI_I2S_SendData(SPI1, byte);
    while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);
    SPI_I2S_ReceiveData(SPI1);
}

unsigned char SPI1_receive_byte(void)
{
    while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);
    SPI_I2S_SendData(SPI1, 0xFF);
    while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);
    return SPI_I2S_ReceiveData(SPI1);
}

void USART2_init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    USART_InitTypeDef USART_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    USART_InitStructure.USART_BaudRate = 115200;
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;
    USART_InitStructure.USART_StopBits = USART_StopBits_1;
    USART_InitStructure.USART_Parity = USART_Parity_No;
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    USART_InitStructure.USART_Mode = USART_Mode_Tx;
    USART_Init(USART2, &USART_InitStructure);

    USART_Cmd(USART2, ENABLE);
}

void USART2_send_byte(unsigned char byte)
{
    while(USART_GetFlagStatus(USART2, USART_FLAG_TC) == RESET);
    USART_SendData(USART2, byte);
}

void delay_ms(unsigned int ms)
{
    unsigned int i, j;

    for(i = 0; i < ms; i++)
    {
        for(j = 0; j < 1000; j++);
    }
}

注意事项：

1. 在使用 SPI 通信时，需要先拉低从机的片选引脚（本例中为 PB10），并在传输完数据后再拉高。
2. OLED 模块使用的是 I2C 通信，本例中未使用 I2C，而是采用了自己定义的一组字符库（F6x8），因此 OLED 模块只能显示英文字母和数字，并且是单色的。如果需要显示中文或多种颜色，需要使用 I2C 通信，并且设置不同的字符库和颜色值。

树莓派使用wiringpi驱动oled屏幕

好的，树莓派使用wiringpi驱动oled屏幕的具体步骤如下：

1.安装wiringpi库

在终端中输入以下命令进行安装：

sudo apt-get update
sudo apt-get install wiringpi

2.连接oled屏幕

将oled屏幕的SDA和SCL引脚分别连接到树莓派的GPIO2和GPIO3引脚上。

3.编写代码

使用wiringpi库编写代码来控制oled屏幕的显示。以下是一个简单的示例：

#include <wiringPi.h>
#include <wiringPiI2C.h>

#define OLED_ADDR 0x3c

int fd;

void write_cmd(unsigned char cmd)
{
    wiringPiI2CWriteReg8(fd, 0x00, cmd);
}

void write_data(unsigned char data)
{
    wiringPiI2CWriteReg8(fd, 0x40, data);
}

void OLED_Init()
{
    write_cmd(0xAE); // display off
    write_cmd(0x20); // set memory addressing mode
    write_cmd(0x00); // horizontal addressing mode
    write_cmd(0x21); // set column address
    write_cmd(0x00); // start column
    write_cmd(0x7F); // end column
    write_cmd(0x22); // set page address
    write_cmd(0x00); // start page
    write_cmd(0x07); // end page
    write_cmd(0xB0); // set page start address
    write_cmd(0xC8); // flip vertically
    write_cmd(0x00); // set low column address
    write_cmd(0x10); // set high column address
    write_cmd(0x40); // set display start line
    write_cmd(0x81); // set contrast control
    write_cmd(0xFF); // set maximum contrast
    write_cmd(0xA1); // set segment remap
    write_cmd(0xA6); // set normal display
    write_cmd(0xA8); // set multiplex ratio
    write_cmd(0x3F); // set maximum multiplex ratio
    write_cmd(0xA4); // set display mode
    write_cmd(0xD3); // set display offset
    write_cmd(0x00); // set offset to 0
    write_cmd(0xD5); // set display clock divide ratio/oscillator frequency
    write_cmd(0xF0); // set divide ratio and oscillator frequency
    write_cmd(0xD9); // set pre-charge period
    write_cmd(0x22); // set pre-charge period to 2 DCLKs
    write_cmd(0xDA); // set COM pins hardware configuration
    write_cmd(0x12); // set alternate COM pins
    write_cmd(0xDB); // set VCOMH
    write_cmd(0x40); // set VCOMH to 0.83 VCC
    write_cmd(0x8D); // set charge pump
    write_cmd(0x14); // enable charge pump
    write_cmd(0xAF); // display on
}

void OLED_Clear()
{
    int i, j;
    for (i = 0; i < 8; i++)
    {
        write_cmd(0xB0 + i);
        write_cmd(0x00);
        write_cmd(0x10);
        for (j = 0; j < 128; j++)
        {
            write_data(0x00);
        }
    }
}

void OLED_ShowString(unsigned char x, unsigned char y, unsigned char *str)
{
    unsigned char c = 0, i = 0, j = 0;
    while (str[j] != '\0')
    {
        c = str[j] - 32;
        if (x > 120)
        {
            x = 0;
            y++;
        }
        write_cmd(0xB0 + y);
        write_cmd((x & 0x0F) | 0x10);
        write_cmd((x >> 4) | 0x00);
        for (i = 0; i < 8; i++)
        {
            write_data(pgm_read_byte(font8x16 + c * 16 + i));
        }
        write_cmd(0xB0 + y);
        write_cmd((x & 0x0F) | 0x10);
        write_cmd((x >> 4) | 0x00);
        for (i = 8; i < 16; i++)
        {
            write_data(pgm_read_byte(font8x16 + c * 16 + i));
        }
        x += 8;
        j++;
    }
}

int main(int argc, char **argv)
{
    if (wiringPiSetup() < 0)
    {
        fprintf(stderr, "Failed to setup wiringPi\n");
        return 1;
    }

    if ((fd = wiringPiI2CSetup(OLED_ADDR)) < 0)
    {
        fprintf(stderr, "Failed to setup I2C device: %s\n", strerror(errno));
        return 1;
    }

    OLED_Init();
    OLED_Clear();
    OLED_ShowString(0, 0, "Hello, world!");
    return 0;
}

这段代码实现了oled屏幕的初始化、清屏和显示字符串等功能。

4.编译运行

在终端中输入以下命令进行编译：

gcc -o oled oled.c -lwiringPi

然后运行程序：

sudo ./oled

此时，oled屏幕应该可以显示出“Hello, world!”这个字符串了。