I2C commands with a 7-bit device address of 0x55 (8 bits = 0xAA to read and 0xAB to write). Each standard command has an associated command code pair, as indicated in Table 12-1, Standard Commands. Each protocol has specific means to access the data at each command code. Data RAM ...
用I2C通讯计算CRC的提示: I2C write command: DEVADDR-W + REG_ADDR + MASTER_DATA_MSB + MASTER_DATA_LSB + CRC CRC is calculated with bits from B39 to B8 I2C read sequence: DEVADDR-W + REG_ADDR + I2C_REPEAT_START + DEVADDR-R + SLAVE_DATA_MSB + SLAVE_DATA_LSB + CRC CRC is calculate...
void WriteDataLCM(uchar dataW); void WriteCommandLCM(uchar CMD,uchar Attribc); void DisplayOneChar(uchar X,uchar Y,uchar DData); void conversion(uint temp_data); void Single_Write_ADXL345(uchar REG_Address,uchar REG_data); //单个写入数据 uchar Single_Read_ADXL345(uchar REG_Address); /...
这个函数里面,从注释可以知道,对于128x64分辨率的屏,会分为8页进行发送;每个页面发送开始的时候,会调用三次ssd1306_WriteCommand函数。 实际上可以不需要重复调用ssd1306_WriteCommand函数: voidssd1306_UpdateScreen(void){uint8_tcmd[]={0X21,// 设置列起始和结束地址0X00,// 列起始地址 00X7F,// 列终止地...
从上面的代码可以看出,sx1_i2c_write_byte主要完成了以下功能: 1、通过调用i2c_get_adapter(0)函数获取指定索引的I2C适配器对象并赋值给adap变量。 2、初始化一个structi2c_msg类型的数组msg,该数组包含一个元素用于I2C消息的传输。 3、设置msg结构体中的字段: ...
LCD_WriteCommand(0x38);//八位数据接口,两行显示,5*7点阵 LCD_WriteCommand(0x0c);//显示开,光标关,闪烁关 LCD_WriteCommand(0x06);//数据读写操作后,光标自动加一,画面不动 LCD_WriteCommand(0x01);//光标复位,清屏 } /** * @brief 在LCD1602指定位置上显示一个字符 ...
Linux系统(也就是内核)为每个I2C适配器生成了一个主设备号为89的设备节点(次设备号为0-255),它并没有针对特定的I2C外设而设计,只是提供了通用的read(),write(),和ioctl()等文件操作接口,在用户空间的应用层就可以借用这些接口访问挂接在适配器上的I2C设备的存储空间或寄存器,并控制I2C设备的工作方式。 ...
void iic_write (unsigned char slave_addr, unsigned char addr, unsigned char data) { //从设备寻址 I2C5.I2CDS = slave_addr; I2C5.I2CCON = 1<<7 | 1<<6 | 1<<5;/*ENABLE ACK BIT, PRESCALER:512, ,ENABLE RX/TX */ I2C5.I2CSTAT = 0x3 << 6 | 1<<5 | 1<<4;/*Master Trans...
if command == "write": _writeMemory(handle, device, addr, length, 0) # 7.向 i2c 从设备写入字节流 地址、字节长度、FLAG、指向数据的指针 print("Wrote to EEPROM") elif command == "read": _readMemory(handle, device, addr, length) # 8.从 i2c 从设备读取字节流 地址、字节长度、FLAG、指...
(struct i2c_adapter *adap, u16 addr, unsigned short flags, char read_write, u8 command, int size, union i2c_smbus_data *data); /* To determine what the adapter supports */ u32 (*functionality) (struct i2c_adapter *); #if IS_ENABLED(CONFIG_I2C_SLAVE) int (*reg_slave)(struct i2c...