com 以上程序,定义了2个类,1个是HwInit类,这个类的核心程序是execute_commands()函数,是对command_list的解析。因此我们需要预先约定一套指令。 第2个类是I2CInterface,主要是初始化接口,并定义标准的读写函数,一共有5个通用函数需要实现: write_command(command) write_data(data) read_data(length) write_comm...
static int adv7533_i2c_write(uint8_t slave_addr, uint8_t reg, uint8_t value) { int ret = 0; uint8_t tx_data[2] = {reg, value}; /* Send commands via I2C */ struct i2c_msg msgs[1] = { { .addr = slave_addr, .flags = I2C_M_WR, // 0 .len = 2, .buf = tx_data...
i2c commands at the u-boot command line (as long as you set CONFIG_SYS_I2C_SOFT_SPEED and CONFIG_SYS_I2C_SOFT_SLAVE for defining speed and slave address 2 changes: 1 addition & 1 deletion 2 arch/arm/cpu/armv8/fsl-layerscape/soc.c Original file line numberDiff line numberDiff line ...
在IIC子系统中,用struct i2c_client来描述一个具体的IIC设备(IIC从机)。73行,如果没有IIC设备的话就直接返回0,表示匹配不成功。 77行,用of的方式进行匹配,应该是设备树方面的,具体没了解过。 82行,如果驱动的id table存在则调用83行的i2c_match_id函数进行匹配: ...
To reset the index back to the beginning of the array, use the following commands. void I2C_SlaveClearReadBuf(void) void I2C_SlaveClearWriteBuf(void) This resets the index back to zero. The next byte the I2C master reads or writes to is the first byte in the array. Before using ...
CCG1 I2C commands Anonymous Not applicable 4 Jan 2016 Hello, I am working on CCG1 type-C USB controller and as per the document, we have the I2C data line to configure registers. But I couldn't find the slave address and I2C commands to communicate. Is there any document for ...
MATLAB sends commands to the adapter board, which is the I2C controller device, in order to communicate with the chip, which is the I2C peripheral device. The i2c object in MATLAB always has the role of I2C controller and cannot be used in the peripheral role. Use fread and fwrite on ...
Get command: host side Start Get Send Command frame (0x00 + 0xFF) Wait for ACK or NACK frame NACK ACK Receive data frame: - number of bytes - protocol version - list of supported commands Wait for ACK or NACK frame ACK NACK End of Get Figure 3. Get command: device side Start Get...
这个函数也很简单,首先调用get_free_i2c_dev()分配并初始化了一个struct i2c_dev结构,使i2c_dev->adap指向操作的adapter.之后,该i2c_dev会被链入链表i2c_dev_list中。再分别以I2C_MAJOR,、adap->nr为主次设备号创建了一个device。如果此时系统配置了udev或者是hotplug,那么就在/dev下自动创建相关的设备节点了。
2. bq28z610是I2C接口, bqstudio 也可以用Advanced Comm来读取数据。在TRM文件里,Table 12-1. Standard Commands里的数据都是可以直接读取对应的地址即可 3.简单来说,在TRM文件里Table 12-2. AltManufacturerAccess() Command List 里面所列的命令 先看ACCESS这一列,