在keil里写oled显示 spi驱动代码

以下是一个简单的使用SPI驱动OLED显示屏的Keil代码示例：

#include "stm32f10x.h"

#define OLED_CS_LOW()   GPIO_ResetBits(GPIOB, GPIO_Pin_12)
#define OLED_CS_HIGH()  GPIO_SetBits(GPIOB, GPIO_Pin_12)
#define OLED_DC_LOW()   GPIO_ResetBits(GPIOB, GPIO_Pin_13)
#define OLED_DC_HIGH()  GPIO_SetBits(GPIOB, GPIO_Pin_13)

void OLED_Write_Command(uint8_t cmd) {
    OLED_DC_LOW();
    SPI_I2S_SendData(SPI2, cmd);
    while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_BSY) == SET);
}

void OLED_Write_Data(uint8_t data) {
    OLED_DC_HIGH();
    SPI_I2S_SendData(SPI2, data);
    while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_BSY) == SET);
}

void OLED_Init() {
    GPIO_InitTypeDef GPIO_InitStructure;
    SPI_InitTypeDef SPI_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE);
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOB, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
    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_1Line_Tx;
    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_16;
    SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
    SPI_Init(SPI2, &SPI_InitStructure);

    GPIO_SetBits(GPIOB, GPIO_Pin_12);

    SPI_Cmd(SPI2, ENABLE);

    OLED_Write_Command(0xAE); // display off
    OLED_Write_Command(0xD5); // set display clock divide ratio/oscillator frequency
    OLED_Write_Command(0x80);
    OLED_Write_Command(0xA8); // set multiplex ratio
    OLED_Write_Command(0x3F);
    OLED_Write_Command(0xD3); // set display offset
    OLED_Write_Command(0x00);
    OLED_Write_Command(0x40); // set display start line
    OLED_Write_Command(0x8D); // set charge pump
    OLED_Write_Command(0x14);
    OLED_Write_Command(0x20); // set memory mode
    OLED_Write_Command(0x00);
    OLED_Write_Command(0xA1); // set segment remap
    OLED_Write_Command(0xC8); // set COM scan direction
    OLED_Write_Command(0xDA); // set COM pins hardware configuration
    OLED_Write_Command(0x12);
    OLED_Write_Command(0x81); // set contrast control
    OLED_Write_Command(0xCF);
    OLED_Write_Command(0xD9); // set pre-charge period
    OLED_Write_Command(0xF1);
    OLED_Write_Command(0xDB); // set VCOMH deselect level
    OLED_Write_Command(0x40);
    OLED_Write_Command(0xA4); // disable entire display on
    OLED_Write_Command(0xA6); // set normal display
    OLED_Write_Command(0xAF); // display on
}

void OLED_Clear() {
    for (uint16_t i = 0; i < 1024; ++i) {
        OLED_Write_Data(0x00);
    }
}

void OLED_Draw_Pixel(uint8_t x, uint8_t y) {
    OLED_Write_Command(0x20); // set memory addressing mode
    OLED_Write_Command(0x00); // horizontal addressing mode
    OLED_Write_Command(0x21); // set column address
    OLED_Write_Command(x);
    OLED_Write_Command(x);
    OLED_Write_Command(0x22); // set page address
    OLED_Write_Command(y / 8);
    OLED_Write_Command(y / 8);
    OLED_Write_Data(1 << (y % 8));
}

int main() {
    OLED_Init();
    OLED_Clear();
    OLED_Draw_Pixel(10, 20);
    while (1);
}

这个代码示例使用SPI2控制OLED显示屏，使用了GPIOB的12、13、14、15四个引脚。代码中OLED_Write_Command和OLED_Write_Data函数用于向OLED发送命令和数据，OLED_Init函数用于初始化OLED显示屏，OLED_Clear函数用于清空屏幕，OLED_Draw_Pixel函数用于在指定的像素位置绘制一个像素。