oled12864与STM32实现I2C通信

要在STM32上实现与OLED12864的I2C通信，你需要完成以下步骤：

1. 确认OLED12864的I2C地址，一般为0x3C或0x3D。
2. 在STM32上配置I2C接口，设置时钟频率、地址模式等参数。
3. 初始化OLED12864，发送相应的初始化指令。
4. 发送数据到OLED12864，例如显示字符或图片等。
5. 关闭I2C接口和OLED12864。

以下是一个简单的例程，可以帮助你了解如何在STM32上实现I2C通信和控制OLED12864显示：

#include "stm32f10x.h"
#include "stm32f10x_i2c.h"
#include "oled12864.h"

#define OLED_I2C                I2C1
#define OLED_I2C_CLK            RCC_APB1Periph_I2C1
#define OLED_I2C_SCL_GPIO       GPIOB
#define OLED_I2C_SCL_PIN        GPIO_Pin_6
#define OLED_I2C_SDA_GPIO       GPIOB
#define OLED_I2C_SDA_PIN        GPIO_Pin_7
#define OLED_I2C_SPEED          400000
#define OLED_I2C_ADDR           0x3C

void I2C_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    I2C_InitTypeDef I2C_InitStructure;

    /* Enable I2C and GPIO clocks */
    RCC_APB1PeriphClockCmd(OLED_I2C_CLK, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);

    /* Configure I2C pins */
    GPIO_InitStructure.GPIO_Pin = OLED_I2C_SCL_PIN | OLED_I2C_SDA_PIN;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
    GPIO_Init(OLED_I2C_SCL_GPIO, &GPIO_InitStructure);

    /* Configure I2C */
    I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
    I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
    I2C_InitStructure.I2C_OwnAddress1 = 0x00;
    I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
    I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
    I2C_InitStructure.I2C_ClockSpeed = OLED_I2C_SPEED;
    I2C_Init(OLED_I2C, &I2C_InitStructure);

    /* Enable I2C */
    I2C_Cmd(OLED_I2C, ENABLE);
}

void OLED_Init(void)
{
    uint8_t init_cmd[] = {0xAE, 0xD5, 0x80, 0xA8, 0x3F, 0xD3, 0x00, 0x40, 0x8D, 0x14, 0x20, 0x00, 0xA1, 0xC8, 0xDA, 0x12, 0x81, 0xCF, 0xD9, 0xF1, 0xDB, 0x40, 0xA4, 0xA6, 0x2E, 0xAF};
    uint8_t i;

    /* Send initialization commands */
    for (i = 0; i < sizeof(init_cmd); i++) {
        OLED_WriteCommand(init_cmd[i]);
    }
}

void OLED_WriteCommand(uint8_t cmd)
{
    /* Send command */
    while (I2C_GetFlagStatus(OLED_I2C, I2C_FLAG_BUSY)) ;
    I2C_GenerateSTART(OLED_I2C, ENABLE);
    while (!I2C_CheckEvent(OLED_I2C, I2C_EVENT_MASTER_MODE_SELECT)) ;
    I2C_Send7bitAddress(OLED_I2C, OLED_I2C_ADDR, I2C_Direction_Transmitter);
    while (!I2C_CheckEvent(OLED_I2C, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)) ;
    I2C_SendData(OLED_I2C, 0x00);
    while (!I2C_CheckEvent(OLED_I2C, I2C_EVENT_MASTER_BYTE_TRANSMITTED)) ;
    I2C_SendData(OLED_I2C, cmd);
    while (!I2C_CheckEvent(OLED_I2C, I2C_EVENT_MASTER_BYTE_TRANSMITTED)) ;
    I2C_GenerateSTOP(OLED_I2C, ENABLE);
}

void OLED_WriteData(uint8_t data)
{
    /* Send data */
    while (I2C_GetFlagStatus(OLED_I2C, I2C_FLAG_BUSY)) ;
    I2C_GenerateSTART(OLED_I2C, ENABLE);
    while (!I2C_CheckEvent(OLED_I2C, I2C_EVENT_MASTER_MODE_SELECT)) ;
    I2C_Send7bitAddress(OLED_I2C, OLED_I2C_ADDR, I2C_Direction_Transmitter);
    while (!I2C_CheckEvent(OLED_I2C, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)) ;
    I2C_SendData(OLED_I2C, 0x40);
    while (!I2C_CheckEvent(OLED_I2C, I2C_EVENT_MASTER_BYTE_TRANSMITTED)) ;
    I2C_SendData(OLED_I2C, data);
    while (!I2C_CheckEvent(OLED_I2C, I2C_EVENT_MASTER_BYTE_TRANSMITTED)) ;
    I2C_GenerateSTOP(OLED_I2C, ENABLE);
}

int main(void)
{
    /* Configure I2C */
    I2C_Configuration();

    /* Initialize OLED */
    OLED_Init();

    /* Display "Hello, world!" */
    OLED_GotoXY(0, 0);
    OLED_Puts("Hello, world!");

    while (1) {
        /* Do something */
    }
}