seo课程培训要多少钱,北京seo主管,深圳公司免费网站建设,qq直接登录网站无需下载这篇文章主要分为三个部分来阐述#xff0c;分别是I2C的基本知识#xff0c;软件I2C通讯#xff0c;硬件I2C通讯。I2C的基本知识这一块#xff0c;部分讲解以及图表来自b站江科大的up#xff0c;很感谢这位up#xff0c;大家可以关注一波。操作实现的时候#xff0c;up使… 这篇文章主要分为三个部分来阐述分别是I2C的基本知识软件I2C通讯硬件I2C通讯。I2C的基本知识这一块部分讲解以及图表来自b站江科大的up很感谢这位up大家可以关注一波。操作实现的时候up使用的是标准库讲解我是用是HAL库但都可以实现。
一、I2C的基本知识
1.基本的三种通讯方式
学过通讯的同学都知道基本的通讯方式有单工半双工全双工。那么这三种工作方式有啥区别吗我给大家举个例子 单工通讯就好比象棋里面的“卒”卒有啥特性没错一条路走到黑不走回头路说白了这种通讯方式就是“有去无回”。我只知道我可以通过这条线发过去但是我没法通过这条线反馈信息。 半双工通讯就好比你在狭窄的山路上开车你可以开入山里面也可以开出山里面但是山路狭窄在同一时刻同一路段只能允许一辆车通过。所以你你要想开入山里面就必须等到出山的车先开出来要想开出山里面就必须让开入山里面的车先开进去。说白了就是说你可以出入山里但是一定要确保你在开车的过程中山路上没有相反方向的车堵住你。所以半双工在同一时刻只能有一个方向的通讯。等到这个方向通讯完成你才可以选择下一次通讯的方向。 全双工通讯就好比我们现在的公路随时随地有来有回去的车道完全不对回来的车道有影响大家各走各的。 这三种通道各自有各自的优劣与使用场景感兴趣的同学可以自己百度百度。我们今天要说的就是I2C就是半双工通讯。
2.I2C通讯规则
①
起始条件:在SCL高电平的时候SDA由高电平变为低电平 ②
终止条件:在SCL高电平的时候SDA由高电平变为低电平 ③
发送一个字节:SCL低电平期间主机将数据位依次放到SDA线上高位先行然后释放SCL从机将在SCL高电平期间读取数据位所以SCL高电平期间SDA不允许有数据变化依次循环上述过程8次即可发送一个字节 ④
接收一个字节:SCL低电平期间从机将数据位依次放到SDA线上高位先行然后释放SCL主机将在SCL高电平期间读取数据位所以SCL高电平期间SDA不允许有数据变化依次循环上述过程8次即可接收一个字节主机在接收之前需要释放SDA就是要让SDA1 ⑤
发送应答:主机在接收完一个字节之后在下一个时钟发送一位数据数据0表示应答数据1表示非应答。
⑥
接收应答:主机在发送完一个字节之后在下一个时钟接收一位数据判断从机是否应答数据0表示应答数据1表示非应答主机在接收之前需要释放SDA。
请大家看清楚接受和发送的对象是谁不要混淆了。
3.硬件电路 第一张图告诉我们所有的从机设备都和主机的时序一样因此属于同步时序。主机的SDA连接着从机的SDA这是一张典型的一主多从模型图。主机想要和谁通讯就只需要输入对应的从机地址就行了。图中的两个R是为了保护电路的具体咋保护的呢
按道理说只要我们按照正常的时序就可以实现主机的SDA输出从机的SDA输入从机的SDA输出主机的SDA输入这没问题。但是如果时序没有协调好有可能会出现一方的SDA输出1一方的SDA输出0这样就相当于高低电平直接接在一起不就短路了吗
因此I2C的设计规定禁止所有的设备无论是主机还是从此内部的SDA,SCL电路都如第二张图所示输出强上拉的高电平采用外置弱上拉的电阻加开路输出的电路结构这样就不用担心短路的问题了如上图所示在输入时无论是SCL还是SDA的电路输入高低电平都无影响。但是在输出是因为SDA和SCL都是开漏模式因此当输出低电平时直接导通输出高电平时被截断处于浮空状态。但是浮空状态不稳定容易受到干扰因此有外接一个电阻R相当于让浮空的引脚与电阻相连完成弱上拉变相的输出高电平。
下面我以主机SDA为例给大家画一下等效图 无论是主机还是从机SDA和SCL都可以这样简化。如果你想了解为什么可以这样的简化你可以去b站上自己学一下场效应管的知识再结合第一第二张图片的电路你就懂了这里我就不细说效应管的知识了。
4.三种基本的I2C时序通讯
①指定地址写指定地址写入一个字节 如果想要写入多个字节在终止条件前面的应答位应答并且再次重复主机发送字节写内容及应答即可直到不想发送然后在写入终止条件。
②当前地址读 如果想要读入多个字节在终止条件前面的应答位应答并且再次重复从机发送字节写内容及应答即可直到不想发送然后在写入终止条件。
当前地址指针就是说这个指针目前指向那个寄存器。当我们写的时候会在该指针的位置写入写完后自动加1向下移动当我们读的时候会在该指针的位置读出读完后自动加1向下移动。
③指定地址读相当于把指定地址写的终止条件去掉然后和当前地址读结合起来。比如说我在指定地址写的时候选好了从机的8位储存器地址那么当前地址指针就要指向这里我们就在这里写接着应答然后开始执行当前地址读的序列那么就可以再当前的位置也就是我们指定的写入地址的位置读取出来数据。
二、软件I2C通讯
1.前提准备 这里还是依据51单片机的I2C模拟通讯来进行改编不熟悉的话可以回看一下51模拟I2C通讯实现OLED显示图片
2.代码部分运行出来是一条蛇
这里我们想要用PB7端口模拟SDA,PB6端口模拟SCL,同时根据第一部分介绍我们应该知道SDA,SCL都应该是开漏模式所以我们的PB7端口和PB6端口都会配置成开漏模式。
#include main.h
#include gpio.h/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#define OLED_I2C_SCL_CLK() __HAL_RCC_GPIOB_CLK_ENABLE()
#define OLED_I2C_SCL_GPIO GPIOB
#define OLED_I2C_SCL_PIN GPIO_PIN_6#define OLED_I2C_SDA_CLK() __HAL_RCC_GPIOB_CLK_ENABLE()
#define OLED_I2C_SDA_GPIO GPIOB
#define OLED_I2C_SDA_PIN GPIO_PIN_7#define OLED_SCL_RESET() HAL_GPIO_WritePin(OLED_I2C_SCL_GPIO,OLED_I2C_SCL_PIN,GPIO_PIN_RESET) //SCL
#define OLED_SCL_SET() HAL_GPIO_WritePin(OLED_I2C_SCL_GPIO,OLED_I2C_SCL_PIN,GPIO_PIN_SET)#define OLED_SDA_RESET() HAL_GPIO_WritePin(OLED_I2C_SDA_GPIO,OLED_I2C_SDA_PIN,GPIO_PIN_RESET) //SDA
#define OLED_SDA_SET() HAL_GPIO_WritePin(OLED_I2C_SDA_GPIO,OLED_I2C_SDA_PIN,GPIO_PIN_SET)/* USER CODE END Includes *//* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
void MyI2C_Start(void)//起始条件
{OLED_SCL_SET();OLED_SDA_SET();OLED_SDA_RESET();OLED_SCL_RESET();}void MyI2C_Stop(void)//终止条件
{OLED_SCL_SET() ;OLED_SDA_RESET();OLED_SDA_SET();
}void MyI2C_SendByte(uint8_t Byte)//发送一个字节
{uint8_t i;uint8_t m,da;da Byte;OLED_SCL_RESET();for(i 0; i 8; i) {m da;m m0x80;if(m 0x80)OLED_SDA_SET();else OLED_SDA_RESET();da da 1;OLED_SCL_SET();OLED_SCL_RESET();}
}char MyI2C_SendAck()//发送应答
{char flag;OLED_SDA_SET();//释放SDAOLED_SCL_SET();flag HAL_GPIO_ReadPin(GPIOB,GPIO_PIN_7);OLED_SCL_RESET();return flag;
}/* USER CODE END PTD *//* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
void Oled_Write_Cmd(char dataCmd)//发送一个写命令字节
{MyI2C_Start();MyI2C_SendByte(0x78);MyI2C_SendAck(); MyI2C_SendByte(0x00);MyI2C_SendAck(); MyI2C_SendByte(dataCmd); MyI2C_SendAck(); MyI2C_Stop();
}void Oled_Write_Data(char dataData)//发送一个写数据字节
{MyI2C_Start();//起始条件MyI2C_SendByte(0x78);//发送从机地址MyI2C_SendAck();//应答MyI2C_SendByte(0x40);//开启写入命令0x00或写入数据0x40MyI2C_SendAck(); //应答MyI2C_SendByte(dataData);//写入具体的命令或者数据MyI2C_SendAck();MyI2C_Stop();//IIC结束
}void OLED_Init(void)
{Oled_Write_Cmd(0xAE);//--display offOled_Write_Cmd(0x00);//---set low column addressOled_Write_Cmd(0x10);//---set high column addressOled_Write_Cmd(0x40);//--set start line address Oled_Write_Cmd(0xB0);//--set page addressOled_Write_Cmd(0x81); // contract controlOled_Write_Cmd(0xFF);//--128 Oled_Write_Cmd(0xA1);//set segment remap Oled_Write_Cmd(0xA6);//--normal / reverseOled_Write_Cmd(0xA8);//--set multiplex ratio(1 to 64)Oled_Write_Cmd(0x3F);//--1/32 dutyOled_Write_Cmd(0xC8);//Com scan directionOled_Write_Cmd(0xD3);//-set display offsetOled_Write_Cmd(0x00);//Oled_Write_Cmd(0xD5);//set osc divisionOled_Write_Cmd(0x80);//Oled_Write_Cmd(0xD8);//set area color mode offOled_Write_Cmd(0x05);//Oled_Write_Cmd(0xD9);//Set Pre-Charge PeriodOled_Write_Cmd(0xF1);//Oled_Write_Cmd(0xDA);//set com pin configuartionOled_Write_Cmd(0x12);//Oled_Write_Cmd(0xDB);//set VcomhOled_Write_Cmd(0x30);//Oled_Write_Cmd(0x8D);//set charge pump enableOled_Write_Cmd(0x14);//Oled_Write_Cmd(0xAF);//--turn on oled panel
}/* USER CODE END PD *//* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
void Oled_Screen_Clear(void){unsigned char i,n;for(i0;i8;i){Oled_Write_Cmd(0xb0i); Oled_Write_Cmd(0x00); Oled_Write_Cmd(0x10); for(n0;n128;n)Oled_Write_Data(0x00); }
}unsigned char bmpImager[] {/*-- 调入了一幅图像D:\无标题.bmp --*/
/*-- 宽度x高度128x64 --128x8x8*/
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x80,0x80,0x80,0x80,0xC0,0xC0,0xC0,0xC0,0xC0,0xC0,
0xC0,0xC0,0xC0,0x40,0x40,0xC0,0xC0,0xC0,0xC0,0xC0,0xC0,0xC0,0x80,0x80,0x80,0x80,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xC0,0xE0,0xF0,0xB8,
0x8C,0x8E,0x86,0x03,0x03,0x01,0x01,0x01,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x80,0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x61,0xE1,0xF1,
0xE1,0x63,0x03,0x06,0x0E,0x0C,0x18,0x70,0xE0,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,
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,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0xFF,0x81,0x81,
0x81,0x81,0x81,0xC1,0xC3,0x67,0x7E,0x3C,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x03,0x07,0x07,0x03,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x80,0x00,0x00,0x00,0x00,0xC0,0xF1,0x7F,0x1F,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x07,0x0F,0x3D,
0x71,0xE1,0xC1,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x18,0x18,0x10,0xF0,0xF0,
0xB0,0x30,0x30,0x30,0x30,0x30,0x30,0x30,0xF0,0xF0,0xB3,0x33,0x36,0x36,0x16,0x1E,
0x1E,0x1B,0x0F,0x0C,0x06,0x07,0x03,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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,
0x00,0x01,0x03,0x9F,0xFC,0xF0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0xFF,
0xFF,0x66,0x66,0x46,0x46,0x46,0x46,0x46,0x62,0x63,0x67,0x7F,0xFC,0xF0,0x80,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80,
0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80,0xC0,0xC0,0xC0,
0xC0,0xC0,0xC0,0x60,0x60,0x60,0xE0,0xA0,0x30,0x30,0x30,0x10,0x18,0x98,0xF8,0xFC,
0x6C,0x0C,0x04,0x06,0x06,0x06,0x62,0xF3,0xF3,0xDB,0xDB,0xDB,0xDB,0xF3,0x73,0x03,
0x03,0x0F,0x1F,0x3F,0x33,0x63,0x62,0x66,0x66,0x36,0x3E,0x1E,0x06,0x06,0x06,0x06,
0x06,0x3B,0x7B,0x6F,0xCD,0xCC,0xC4,0xCC,0xCC,0x6C,0x78,0x38,0x80,0xE0,0x7C,0x3F,
0x0F,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x08,0xEC,0xFF,0x7F,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x01,0x01,0x03,0x03,0x03,0x07,0x07,0x05,0x0D,0x0D,0x09,0x19,
0x19,0x19,0x31,0x31,0x31,0x61,0x61,0x61,0x61,0x41,0xC1,0xC0,0xC0,0xC0,0xC0,0xC0,
0xC0,0xC0,0xC0,0xC0,0xC0,0xC0,0xC0,0xC1,0xC1,0x43,0x63,0x63,0x63,0x31,0x31,0x30,
0x10,0x18,0x18,0x18,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,
0x0C,0x0C,0x18,0x18,0x18,0x30,0x30,0x30,0x60,0x60,0x60,0x60,0x60,0xE0,0xF0,0xF0,
0xF0,0xF0,0xF0,0xF0,0xD8,0xD8,0xD8,0xDC,0xFC,0xF6,0xF6,0xE3,0xE3,0xE3,0x63,0x63,
0x63,0x62,0x66,0x36,0x36,0x36,0x1E,0x1E,0x0E,0x0E,0x06,0x07,0x03,0x00,0x00,0x00,
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,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
};void Oled_Show_Image(unsigned char *image)
{unsigned char i; unsigned int j;for(i0;i8;i){Oled_Write_Cmd(0xB0 i);//page0--page7//每个page从0列Oled_Write_Cmd(0x00);Oled_Write_Cmd(0x10);//0到127列依次写入0每写入数据列地址自动偏移for(j 128 * i; j(128 * (i1));j){Oled_Write_Data(image[j]);}}
}
/* USER CODE END PM *//* Private variables ---------------------------------------------------------*//* USER CODE BEGIN PV *//* USER CODE END PV *//* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
/* USER CODE BEGIN PFP *//* USER CODE END PFP *//* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 *//* USER CODE END 0 *//*** brief The application entry point.* retval int*/
int main(void)
{/* USER CODE BEGIN 1 *//* USER CODE END 1 *//* MCU Configuration--------------------------------------------------------*//* Reset of all peripherals, Initializes the Flash interface and the Systick. */HAL_Init();/* USER CODE BEGIN Init *//* USER CODE END Init *//* Configure the system clock */SystemClock_Config();/* USER CODE BEGIN SysInit *//* USER CODE END SysInit *//* Initialize all configured peripherals */MX_GPIO_Init();/* USER CODE BEGIN 2 */OLED_Init();//2. 选择一个位置//2.1 确认页寻址模式Oled_Write_Cmd(0x20);Oled_Write_Cmd(0x02);Oled_Screen_Clear();Oled_Show_Image(bmpImager);/* USER CODE END 2 *//* Infinite loop *//* USER CODE BEGIN WHILE */while (1){/* USER CODE END WHILE *//* USER CODE BEGIN 3 */}/* USER CODE END 3 */
}
3.stm32cube配置
SYS,RCC照旧
GPIO的配置如下图PB6,7配置一样 三、硬件I2C通讯
1.前提准备 我们的32单片机是有I2C外设的而51里面没有I2C外设因此我们的32单片机既可以用硬件I2C通讯也可以模拟I2C通讯。这里我们要实现的是利用32单片机和HAL库重新做一下OLED显示图片oled的操作说明和图片的操作细节可以再http://t.csdnimg.cn/Bk61c和http://t.csdnimg.cn/A8htshttp://t.csdnimg.cn/Bk61c和 里面看一下。 我们使用硬件I2C后可以直接调用直接调用库函数来控制寄存器让寄存器控制硬件电路的状态从而来控制SDA和SCL的时序。诸如起始终止条件接受发送字节应答之类的我们不用软件I2C那样自己手动控制SDA和SCL的时序只需要用库函数即可控制硬件调制出我们需要的时序。那么既然硬件那么好为啥还要软件I2C?我玩个梗加个外设可以得加钱。
2.代码部分运行出来是女孩头像
先说一下我们要用的函数
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)
它的作用是以阻塞方式将一定数量的数据写入特定的内存地址下面看看参数
参数一I2C_HandleTypeDef *hi2c选择哪一个I2C通道的地址
参数二uint16_t DevAddress目标器件的地址七位地址必须左对齐外加最后一位读写位
参数三uint16_t MemAddress目标器件的目标寄存器地址或者指令控制字
参数四uint16_t MemAddSize目标器件内部寄存器地址数据长度及一个数据有多大这里可以选择8位或者16位
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_StatusTypeDefHAL状态OKbusyERRORTIMEOUT
沿着51单片机显示图片的程序我们继续修改
#include main.h
#include i2c.h
#include gpio.h/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes *//* USER CODE END Includes *//* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD *//* USER CODE END PTD *//* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD *//* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM *//* USER CODE END PM *//* Private variables ---------------------------------------------------------*//* USER CODE BEGIN PV */
void Oled_Write_Cmd(uint8_t dataCmd)
{HAL_I2C_Mem_Write(hi2c1, 0x78, 0x00, I2C_MEMADD_SIZE_8BIT,dataCmd, 1, 0xff);
}void Oled_Write_Data(uint8_t dataData)
{HAL_I2C_Mem_Write(hi2c1, 0x78, 0x40, I2C_MEMADD_SIZE_8BIT,dataData, 1, 0xff);
}void Oled_Init(void){Oled_Write_Cmd(0xAE);//--display offOled_Write_Cmd(0x00);//---set low column addressOled_Write_Cmd(0x10);//---set high column addressOled_Write_Cmd(0x40);//--set start line address Oled_Write_Cmd(0xB0);//--set page addressOled_Write_Cmd(0x81); // contract controlOled_Write_Cmd(0xFF);//--128 Oled_Write_Cmd(0xA1);//set segment remap Oled_Write_Cmd(0xA6);//--normal / reverseOled_Write_Cmd(0xA8);//--set multiplex ratio(1 to 64)Oled_Write_Cmd(0x3F);//--1/32 dutyOled_Write_Cmd(0xC8);//Com scan directionOled_Write_Cmd(0xD3);//-set display offsetOled_Write_Cmd(0x00);//Oled_Write_Cmd(0xD5);//set osc divisionOled_Write_Cmd(0x80);//Oled_Write_Cmd(0xD8);//set area color mode offOled_Write_Cmd(0x05);//Oled_Write_Cmd(0xD9);//Set Pre-Charge PeriodOled_Write_Cmd(0xF1);//Oled_Write_Cmd(0xDA);//set com pin configuartionOled_Write_Cmd(0x12);//Oled_Write_Cmd(0xDB);//set VcomhOled_Write_Cmd(0x30);//Oled_Write_Cmd(0x8D);//set charge pump enableOled_Write_Cmd(0x14);//Oled_Write_Cmd(0xAF);//--turn on oled panel
}void Oled_Screen_Clear(void){char i,n;Oled_Write_Cmd (0x20); //set memory addressing modeOled_Write_Cmd (0x02); //page addressing modefor(i0;i8;i){Oled_Write_Cmd(0xb0i); //éè??ò3μ??·¨0~7?Oled_Write_Cmd(0x00); //éè????ê??????aáDμíμ??·Oled_Write_Cmd(0x10); //éè????ê??????aáD??μ??· for(n0;n128;n)Oled_Write_Data(0x00); }
}unsigned char bmpImager[] {/*-- 调入了一幅图像D:\无标题.bmp --*/
/*-- 宽度x高度128x64 --128x8x8*/
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0xF0,0x08,0x0C,0x04,0x06,0x06,0x0C,0x04,0x0C,0xFC,0x1C,0x74,0xFC,0xF8,
0xF0,0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x01,0x07,0x04,0x88,0xF8,0x08,0x08,0x0C,0x06,0x01,0x00,0x00,0x01,0x1F,
0x7F,0xFF,0xDC,0xF8,0xE0,0xC0,0x40,0xC0,0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xE0,0x10,0x18,0x08,0x0C,
0x04,0x04,0x06,0x02,0x01,0x01,0x00,0x00,0x00,0x00,0xFF,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x3F,0x60,0xC0,0x80,0x80,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x3F,0xE0,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,
0x03,0x06,0x1C,0xF0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x07,0xFC,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x08,0x08,0x88,0xE8,0x38,0x0E,0x09,0x08,
0x08,0x88,0xE8,0x18,0x08,0x08,0x08,0x00,0x00,0xFF,0x89,0x89,0x89,0xFF,0x00,0xFF,
0x89,0x89,0x89,0x89,0xFF,0x00,0x00,0x04,0x04,0x84,0x74,0x6F,0xA4,0x24,0x24,0x24,
0x24,0xA4,0x64,0x04,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x80,0xF0,0x1F,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0x7F,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x10,0x10,0x10,0x08,0x09,0x09,0x06,0x06,
0x06,0x05,0x08,0x08,0x10,0x10,0x00,0x00,0x0C,0x03,0x10,0x10,0x10,0x1F,0x18,0x07,
0x00,0x00,0x10,0x10,0x1F,0x00,0x10,0x08,0x06,0x11,0x10,0x08,0x09,0x0A,0x06,0x06,
0x0B,0x08,0x10,0x10,0x10,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xF0,
0x1E,0x03,0x00,0x00,0xC0,0x60,0x30,0x0C,0x04,0x06,0x02,0x01,0x01,0x00,0x00,0x00,
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,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,
0x1E,0x60,0x78,0x0F,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,};void Oled_Show_Image(unsigned char *image)
{unsigned char i; unsigned int j;for(i0;i8;i){Oled_Write_Cmd(0xB0 i);//page0--page7//每个page从0列Oled_Write_Cmd(0x00);Oled_Write_Cmd(0x10);//0到127列依次写入0每写入数据列地址自动偏移for(j 128 * i; j(128 * (i1));j){Oled_Write_Data(image[j]);}}
}/* USER CODE END PV *//* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
/* USER CODE BEGIN PFP *//* USER CODE END PFP *//* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 *//* USER CODE END 0 *//*** brief The application entry point.* retval int*/
int main(void)
{/* USER CODE BEGIN 1 *//* USER CODE END 1 *//* MCU Configuration--------------------------------------------------------*//* Reset of all peripherals, Initializes the Flash interface and the Systick. */HAL_Init();/* USER CODE BEGIN Init *//* USER CODE END Init *//* Configure the system clock */SystemClock_Config();/* USER CODE BEGIN SysInit *//* USER CODE END SysInit *//* Initialize all configured peripherals */MX_GPIO_Init();MX_I2C1_Init();/* USER CODE BEGIN 2 *///1. OLED初始化Oled_Init();//2. 选择一个位置//2.1 确认页寻址模式Oled_Write_Cmd(0x20);Oled_Write_Cmd(0x02);Oled_Screen_Clear();Oled_Show_Image(bmpImager);/* USER CODE END 2 *//* Infinite loop *//* USER CODE BEGIN WHILE */while (1){/* USER CODE END WHILE *//* USER CODE BEGIN 3 */}/* USER CODE END 3 */
}
3.stm32cube的配置
SYS,RCC照旧不变。I2C1里面如下图选择 这里要说一点就是stm32可以作为主机或者从机是用。实验里面只要stm32产生起始条件我们把stm32当做主机使用因此从机模式里面我们压根就没有管保持他的默认形式就行。 最后我想说的是无论是HAL还是标准库都可以实现我们的需求。标准库写的麻烦但是可以染你在写程序的时候更多关注于手册的细节HAL库看似比较简单方便但是他是高度集成的里面很多细节不是那么容易看出来的因为HAL库封装的程度太高了各取所需吧。
