IIC的再认识

IIC介绍

关于IIC的基本概念,其实在学习89C52的时候已经大致了解过了,且由于STM32支持了IIC协议,所以在STM32中使用IIC可以直接调用HAL库的库函数:

HAL_StatusTypeDef HAL_I2C_Mem_Write(I2C_HandleTypeDef *hi2c,
                                    uint16_t DevAddress,
                                    uint16_t MemAddress,
                                    uint16_t MemAddSize,
                                    uint8_t *pData,
                                    uint16_t Size,
                                    uint32_t Timeout)

参数一:I2C_HandleTypeDef *hi2c,I2C设备句柄

参数二:uint16_t DevAddress,目标器件的地址,七位地址必须左对齐

参数三:uint16_t MemAddress,目标器件的目标寄存器地址

参数四:uint16_t MemAddSize,目标器件内部寄存器地址数据长度

参数五:uint8_t *pData,待写的数据首地址

参数六:uint16_t Size,待写的数据长度

参数七:uint32_t Timeout,超时时间

返回值:HAL_StatusTypeDef,HAL状态(OK,busy,ERROR,TIMEOUT)

硬件介绍

同样使用之前用过的OLED,使用的是IIC协议:

IIC的再认识_第1张图片IIC的再认识_第2张图片

那么对于之前学习的概念,可以轻易的写出对于OLED写命令写数据的函数封装:

对OLED写命令:

void OLED_writecmd(uint8_t dataCmd)
{
    HAL_I2C_Mem_Write(&hi2c1, 0x78, 0x00, I2C_MEMADD_SIZE_8BIT, &dataCmd, 1, 0xff);
}

 对OLED写数据:

void OLED_writedata(uint8_t dataData)
{
    HAL_I2C_Mem_Write(&hi2c1, 0x78, 0x40, I2C_MEMADD_SIZE_8BIT, &dataData, 1, 0xff);
}

在STM32里再次实现OLED的显示

假如我选择页寻址模式显示以下图像的话:

由于这个图片之前我在取模软件中已经取过模,所以直接拿来用了:

code unsigned char bmpPic[] = { //使用unsigned可以使得原本从负数到正数的范围扩展到两倍的正数,适用于大量无符号数存在时
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xE0,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xC0,0xE0,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x10,
0x10,0x10,0x10,0x10,0x18,0x08,0x08,0x08,0x08,0x08,0xF8,0x18,0x08,0x08,0x08,0x08,
0x08,0x08,0x08,0x08,0x08,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xC0,0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0xE0,0xE0,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xC0,0x38,0x0F,0x01,0x07,0x1C,0x70,0xC0,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x80,0xF8,0x0F,0x01,0x01,0x0F,0x70,0xC0,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,0xFE,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0xC0,0x7E,0x03,0x07,0x3C,0xE0,0x80,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xC0,0x70,0x0E,0x03,0x00,0x00,0x07,0x1C,0x70,
0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0xE0,0x1E,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x03,0x1E,
0x70,0x80,0x00,0x00,0x00,0xF0,0x1F,0x00,0x00,0x00,0x00,0x00,0x00,0x03,0x1E,0xF0,
0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x07,0xFC,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x80,0xE0,0x3C,0x07,0x00,0x00,0x00,0x00,0x00,0x07,0x1C,0x70,0x80,0x00,
0x00,0x00,0x00,0x00,0x00,0xE0,0x3E,0x03,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x01,0x07,0x0C,0x30,0xC0,0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x30,0x3E,0x03,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x03,0x0C,0x0C,0x03,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x0F,0x78,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,
0x3F,0x60,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0xF0,0x1F,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x60,0x3C,0x07,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,0x0E,
0x38,0xE0,0xE0,0x3C,0x07,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x03,0x06,0x1C,0x70,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x01,0x03,0x0E,0x08,0x08,0x08,0x0C,0x06,0x03,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x01,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
};

CubeMX

1. 惯例配置

2. 点击左侧的I2C1,选择I2C:

IIC的再认识_第3张图片

2.1 在上图下方可以看到IIC的一些配置信息,此处暂时不做修改

IIC的再认识_第4张图片 

2.2 点击上图中的GPIO Setting:

IIC的再认识_第5张图片

所以OLED的SCLSDA应该分别接在 PB6PB7 !

3. 惯例配置生成代码:

 

 

Keil

unsigned char bmpPic[] = { //使用unsigned可以使得原本从负数到正数的范围扩展到两倍的正数,适用于大量无符号数存在时
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xC0,0xE0,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x10,
0x10,0x10,0x10,0x10,0x18,0x08,0x08,0x08,0x08,0x08,0xF8,0x18,0x08,0x08,0x08,0x08,
0x08,0x08,0x08,0x08,0x08,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xC0,0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0xE0,0xE0,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xC0,0x38,0x0F,0x01,0x07,0x1C,0x70,0xC0,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x80,0xF8,0x0F,0x01,0x01,0x0F,0x70,0xC0,0x00,0x00,
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0x00,0x00,0x00,0x00,0x00,0xC0,0x7E,0x03,0x07,0x3C,0xE0,0x80,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xC0,0x70,0x0E,0x03,0x00,0x00,0x07,0x1C,0x70,
0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0xE0,0x1E,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x03,0x1E,
0x70,0x80,0x00,0x00,0x00,0xF0,0x1F,0x00,0x00,0x00,0x00,0x00,0x00,0x03,0x1E,0xF0,
0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x07,0xFC,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x80,0xE0,0x3C,0x07,0x00,0x00,0x00,0x00,0x00,0x07,0x1C,0x70,0x80,0x00,
0x00,0x00,0x00,0x00,0x00,0xE0,0x3E,0x03,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x01,0x07,0x0C,0x30,0xC0,0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x30,0x3E,0x03,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x03,0x0C,0x0C,0x03,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x0F,0x78,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,
0x3F,0x60,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0xF0,0x1F,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x60,0x3C,0x07,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,0x0E,
0x38,0xE0,0xE0,0x3C,0x07,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x03,0x06,0x1C,0x70,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x01,0x03,0x0E,0x08,0x08,0x08,0x0C,0x06,0x03,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x01,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
};

void OLED_writecmd(uint8_t dataCmd)
{
    HAL_I2C_Mem_Write(&hi2c1, 0x78, 0x00, I2C_MEMADD_SIZE_8BIT, &dataCmd, 1, 0xff);
}

void OLED_writedata(uint8_t dataData)
{
    HAL_I2C_Mem_Write(&hi2c1, 0x78, 0x40, I2C_MEMADD_SIZE_8BIT, &dataData, 1, 0xff);
}

void Oled_Init()
{
	OLED_writecmd(0xAE);//--display off
	OLED_writecmd(0x00);//---set low column address
	OLED_writecmd(0x10);//---set high column address
	OLED_writecmd(0x40);//--set start line address  
	OLED_writecmd(0xB0);//--set page address
	OLED_writecmd(0x81); // contract control
	OLED_writecmd(0xFF);//--128   
	OLED_writecmd(0xA1);//set segment remap 
	OLED_writecmd(0xA6);//--normal / reverse
	OLED_writecmd(0xA8);//--set multiplex ratio(1 to 64)
	OLED_writecmd(0x3F);//--1/32 duty
	OLED_writecmd(0xC8);//Com scan direction
	OLED_writecmd(0xD3);//-set display offset
	OLED_writecmd(0x00);//
	
	OLED_writecmd(0xD5);//set osc division
	OLED_writecmd(0x80);//
	
	OLED_writecmd(0xD8);//set area color mode off
	OLED_writecmd(0x05);//
	
	OLED_writecmd(0xD9);//Set Pre-Charge Period
	OLED_writecmd(0xF1);//
	
	OLED_writecmd(0xDA);//set com pin configuartion
	OLED_writecmd(0x12);//
	
	OLED_writecmd(0xDB);//set Vcomh
	OLED_writecmd(0x30);//
	
	OLED_writecmd(0x8D);//set charge pump enable
	OLED_writecmd(0x14);//
	
	OLED_writecmd(0xAF);//--turn on oled panel		
}
 
void Oled_Clear()
{
	int i;
	int j;
	
	for(i = 0; i<8; i++){
		OLED_writecmd(0xB0 + i);//依次选择每一页
		OLED_writecmd(0x00);//选择0列
	  OLED_writecmd(0x10);//选择0列
		for(j = 0; j<128; j++){
			OLED_writedata(0x00);//由于地址会自动偏移,所以只要重复写128次全0,就可以清一个PAGE
		}
	}
}
 
void print_pic(unsigned char *pic)
{
	unsigned int i;//使用unsigned可以使得原本从负数到正数的范围扩展到两倍的正数,适用于大量无符号数存在时
	unsigned int j;//使用unsigned可以使得原本从负数到正数的范围扩展到两倍的正数,适用于大量无符号数存在时
	
	for(i = 0; i<8; i++){
		OLED_writecmd(0xB0 + i);//依次选择每一page
		OLED_writecmd(0x00);//选择0列
	  OLED_writecmd(0x10);//选择0列
		for(j = 128*i; j<(128*(i+1)); j++){ 
			OLED_writedata(pic[j]);
		}
	}
}

int main(void)
{	
	Oled_Init();
	Oled_Clear();
	
	OLED_writecmd(0x20);//页寻址模式
	OLED_writecmd(0x02);//页寻址模式
	
	print_pic(bmpPic);


  while (1)
  {

  }

}

实现效果 

IIC的再认识_第6张图片

 

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