(file, I2C_SLAVE, addr) < 0) { perror("Failed to acquire bus access and/or talk to slave."); return 1; } char buf[10]; if (read(file, buf, 10) != 10) { perror("Failed to read from the i2c bus."); } else { printf("Read: %s\n", buf); } close(file); return 0;...
摘要:本文是在海思平台上,通过 i2c_read 命令来读取 imx334 寄存器的值,通过和代码设置的寄存器的值来进行比较,根据读到的值和设置的值是否一致,从而来判断设置的是否正确,寄存器是否生效。 已知:imx334 的 I2C 地址是0x34 查看i2c_read用法 ~# i2c_read*** Board tools : ver0.0.1_20121120 *** [debug]...
项目之前研究了I2C通信协议的实现,完成FPGA对视频解码芯片SAA7111A的初始化配置,设计实现了I2C主机对从机(SAA7111A)32个寄存器的写操作,因此只简单实现了I2C的写时序。 这次重新梳理学习了I2C协议,借助黑金开发板设计I2C主机控制器完成对EEPROM(24LC02)的读写操作,设计单字节的写时序和随机读时序。通过按键将数据先...
ioctl(fd,I2C_TENBIT,0)。 ioctl(fd,I2C_SLAVE,0xA0>>1); read()与write()函数的使用 假设子地址为12,向有子地址的器件写进7个字节: unsigned char buf[8]={12,'s','j','s','u','n','n','y');write(fd,buf,9);/*写进7个字节,第1个字节为子地址*/ 从有子地址的I2C器件读取7个字节:...
以下是一个简单的I2C读取操作的代码示例: AI检测代码解析 importandroid.hardware.i2c.I2cDevice;importandroid.hardware.i2c.I2cManager;importandroid.content.Context;publicclassI2CReadExample{privateI2cDevicei2cDevice;publicI2CReadExample(Contextcontext,intdeviceAddr){I2cManageri2cManager=(I2cManager)context.getSystem...
I have called XMC_I2C_CH_MasterStart(XMC_I2C_CH_CMD_READ) from the i2c master and have confirmed up to ack reception. I cannot confirm the status of XMC_I2C_CH_STATUS_FLAG_RECEIVE_INDICATION after that. I will provide the software I created. ...
PI2C_READ Pi2cRead; BOOLEAN Pi2cRead( [in] IN PVOID HwDeviceExtension, [in] IN PI2C_CALLBACKS I2CCallbacks, [out] OUT PUCHAR Buffer, [in] IN ULONG Length ) {...} 参数[in] HwDeviceExtension指向微型端口驱动程序的每个适配器设备扩展的指针。[in] I2CCallbacks指向...
defpins.i2c_read_register(address: number, register: number, valueFormat: NumberFormat):number Devices connected to an I2C bus will often have registers where data values are set as status or action requests. Although the device is accessed at a single address, it can have multiple registers. ...
i2c read <register_address> <byte_count> 这些命令的具体语法和可用性可能会因U-Boot的版本和配置而异。因此,建议查阅你正在使用的U-Boot版本的官方文档或源代码,以获取最准确的信息。 此外,需要注意的是,读取I2C设备通常需要一定的硬件知识和经验,因为你需要知道设备的具体规格和通信协议。如果你不熟悉这些方面,...
AD7997 I2C read error问题定位及处理 出现I2C error 时,循环读AD7997的各VIN通道,返回值一直为7F00,错误原因是读超时,此时SCL为高电平,SDA为低电平,处理如下:1 CONVST管脚设置为低,高,低,重新power up AD7997,错误不可恢复,2 卸载AD7997驱动,重新加载,错误不可恢复,3 I2C驱动卸载,重新加载,...