什么是通用呼叫地址，它在 I2C 中的用途是什么？
What is General Call Address and what is the purpose of it in I2C?
我想知道I2C (0x00) 中的通用调用地址是什么。如果我们有一个主机和一些从机，我们可以通过我们的主机使用这个地址与这些从机通信吗？
I2C 规范 v.6 (https://www.i2c-bus.org/specification/) 的第 3.2.10 节清楚地描述了通用调用的目的。
3.2.10General call address
The general call address is for addressing every device connected to the I2C-bus at the
same time. However, if a device does not need any of the data supplied within the general
call structure, it can ignore this address. If a device does require data from a general call
address, it behaves as a slave-receiver. The master does not actually know how many
devices are responsive to the general call. The second and following bytes are received
by every slave-receiver capable of handling this data. A slave that cannot process one of
these bytes must ignore it. The meaning of the general call address is always specified in
the second byte (see Figure 30).
您可以使用它与您的奴隶通信，但有三个限制。
- General call只能写数据到slave，不能读
- 每个slave都应该接收general call，你不能用它来寻址特定的设备，或者你必须在general call消息体中对设备地址进行编码，然后在slave中解码。
- 有标准的普通呼叫消息格式。您不应将标准代码用于您自己的功能。
我想知道I2C (0x00) 中的通用调用地址是什么。如果我们有一个主机和一些从机，我们可以通过我们的主机使用这个地址与这些从机通信吗？
I2C 规范 v.6 (https://www.i2c-bus.org/specification/) 的第 3.2.10 节清楚地描述了通用调用的目的。
3.2.10General call address
The general call address is for addressing every device connected to the I2C-bus at the same time. However, if a device does not need any of the data supplied within the general call structure, it can ignore this address. If a device does require data from a general call address, it behaves as a slave-receiver. The master does not actually know how many devices are responsive to the general call. The second and following bytes are received by every slave-receiver capable of handling this data. A slave that cannot process one of these bytes must ignore it. The meaning of the general call address is always specified in the second byte (see Figure 30).
您可以使用它与您的奴隶通信，但有三个限制。
- General call只能写数据到slave，不能读
- 每个slave都应该接收general call，你不能用它来寻址特定的设备，或者你必须在general call消息体中对设备地址进行编码，然后在slave中解码。
- 有标准的普通呼叫消息格式。您不应将标准代码用于您自己的功能。