在stm32f103c8t6上使用的的0.96寸4针oled显示屏代码

以下是使用STM32F103C8T6控制0.96寸4针OLED显示屏的代码示例：

#include "stm32f10x.h"
#include "stm32f10x_spi.h"
#include "stm32f10x_gpio.h"

#define OLED_DC_PIN GPIO_Pin_5
#define OLED_DC_PORT GPIOB
#define OLED_RST_PIN GPIO_Pin_6
#define OLED_RST_PORT GPIOB
#define OLED_CS_PIN GPIO_Pin_7
#define OLED_CS_PORT GPIOB

void OLED_Init(void);
void OLED_Write_Command(uint8_t cmd);
void OLED_Write_Data(uint8_t data);
void OLED_Set_Pos(uint8_t x, uint8_t y);
void OLED_Fill_Screen(uint8_t data);
void OLED_Show_String(uint8_t x, uint8_t y, uint8_t *str);
void delay_ms(uint16_t n);

int main(void)
{
    OLED_Init();

    while(1)
    {
        OLED_Fill_Screen(0x00);
        OLED_Show_String(0, 0, "Hello World!");
        delay_ms(1000);
    }
}

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

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_SPI1, ENABLE);

    GPIO_InitStructure.GPIO_Pin = OLED_DC_PIN | OLED_RST_PIN | OLED_CS_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(OLED_DC_PORT, &GPIO_InitStructure);

    GPIO_SetBits(OLED_DC_PORT, OLED_CS_PIN | OLED_DC_PIN | OLED_RST_PIN);
    delay_ms(100);
    GPIO_ResetBits(OLED_RST_PORT, OLED_RST_PIN);
    delay_ms(20);
    GPIO_SetBits(OLED_RST_PORT, OLED_RST_PIN);
    delay_ms(100);

    SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
    SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Tx;
    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_2;
    SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
    SPI_Init(SPI1, &SPI_InitStructure);

    SPI_Cmd(SPI1, ENABLE);

    OLED_Write_Command(0xAE); //display off
    OLED_Write_Command(0x20); //Set Memory Addressing Mode
    OLED_Write_Command(0x10); //00,Horizontal Addressing Mode;01,Vertical Addressing Mode;10,Page Addressing Mode (RESET);11,Invalid
    OLED_Write_Command(0xB0); //Set Page Start Address for Page Addressing Mode,0-7
    OLED_Write_Command(0xC8); //Set COM Output Scan Direction
    OLED_Write_Command(0x00); //---set low column address
    OLED_Write_Command(0x10); //---set high column address
    OLED_Write_Command(0x40); //--set start line address
    OLED_Write_Command(0x81); //--set contrast control register
    OLED_Write_Command(0xFF);
    OLED_Write_Command(0xA1); //--set segment re-map 0 to 127
    OLED_Write_Command(0xA6); //--set normal display
    OLED_Write_Command(0xA8); //--set multiplex ratio(1 to 64)
    OLED_Write_Command(0x3F); //
    OLED_Write_Command(0xA4); //0xa4,Output follows RAM content;0xa5,Output ignores RAM content
    OLED_Write_Command(0xD3); //-set display offset
    OLED_Write_Command(0x00); //-not offset
    OLED_Write_Command(0xD5); //--set display clock divide ratio/oscillator frequency
    OLED_Write_Command(0xF0); //--set divide ratio
    OLED_Write_Command(0xD9); //--set pre-charge period
    OLED_Write_Command(0x22); //
    OLED_Write_Command(0xDA); //--set com pins hardware configuration
    OLED_Write_Command(0x12);
    OLED_Write_Command(0xDB); //--set vcomh
    OLED_Write_Command(0x20); //0x20,0.77xVcc
    OLED_Write_Command(0x8D); //--set DC-DC enable
    OLED_Write_Command(0x14); //
    OLED_Write_Command(0xAF); //--turn on oled panel
}

void OLED_Write_Command(uint8_t cmd)
{
    GPIO_ResetBits(OLED_DC_PORT, OLED_DC_PIN);
    GPIO_ResetBits(OLED_CS_PORT, OLED_CS_PIN);
    SPI_I2S_SendData(SPI1, cmd);
    while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY) == SET);
    GPIO_SetBits(OLED_CS_PORT, OLED_CS_PIN);
}

void OLED_Write_Data(uint8_t data)
{
    GPIO_SetBits(OLED_DC_PORT, OLED_DC_PIN);
    GPIO_ResetBits(OLED_CS_PORT, OLED_CS_PIN);
    SPI_I2S_SendData(SPI1, data);
    while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY) == SET);
    GPIO_SetBits(OLED_CS_PORT, OLED_CS_PIN);
}

void OLED_Set_Pos(uint8_t x, uint8_t y)
{
    OLED_Write_Command(0xB0 + y);
    OLED_Write_Command(((x & 0xF0) >> 4) | 0x10);
    OLED_Write_Command(x & 0x0F);
}

void OLED_Fill_Screen(uint8_t data)
{
    uint8_t i, j;
    for (i = 0; i < 8; i++)
    {
        OLED_Write_Command(0xB0 + i);
        OLED_Write_Command(0x00);
        OLED_Write_Command(0x10);
        for (j = 0; j < 128; j++)
        {
            OLED_Write_Data(data);
        }
    }
}

void OLED_Show_String(uint8_t x, uint8_t y, uint8_t *str)
{
    while (*str != '\0')
    {
        OLED_Set_Pos(x, y);
        uint8_t i;
        for (i = 0; i < 8; i++)
        {
            OLED_Write_Data(FONT8x8[(*str)][i]);
        }
        x += 8;
        str++;
    }
}

void delay_ms(uint16_t n)
{
    uint16_t i, j;
    for (i = 0; i < n; i++)
    {
        for (j = 0; j < 1141; j++);
    }
}

其中，`OLED_Init()`进行OLED屏幕初始化，`OLED_Write_Command()`和`OLED_Write_Data()`用于向OLED屏幕写入指令和数据，`OLED_Set_Pos()`用于设置OLED屏幕显示位置，`OLED_Fill_Screen()`用于填充整个OLED屏幕，`OLED_Show_String()`用于在指定位置显示字符串。注意，此代码中使用的是8x8大小的字体，需要提供相应的字体库。