请问从属I2c读取图像不工作该怎么办？

嗨，我在PIC18F4680上有一个主I2C，它从温度传感器读出指令，然后用PIC18F46K22在从模式下向另一个板发送命令。在从奴隶PIC获取信息时，我有一个问题，我正在寻找（我猜）两个可能的答案。所有与温度传感器的I2C通信工作良好，并且从从属PIC写入也很好。因此：1。由于奴隶不能发起通信，所以主人必须轮询它并询问它是否有什么要说的。这就是我现在所拥有的，但是我不能让主人从奴隶那里读书。2。有一个多主总线，在需要的时候让第二个PIC写到总线上（还没有尝试过）。我附加了3个带有主代码和从代码的文件，以及一个由两个板使用define来选择内容的第三个文件。前2个文件大多是MCC生成的代码。当接收到READ_REQUEST时，我写信给从机端的SSP1BUF，我无法在主机端读取该信息。如果我想让他们做多主的话，我真的不知道如何修改主代码以便在“奴隶”条件下接收。先谢谢你，



      以下为原文

    Hi, I have a Master I2C on a PIC18F4680 that reads from a temperature sensor and sends commands to another board with a PIC18F46K22 in Slave mode. I have a problem when getting information back from the slave pic and I'm looking for (I guess) two possible answers. All I2C communication with the temperature sensor works fine, and writing to the Slave PIC also works fine.

So:
1. Since a Slave cannot initiate communication, the Master would have to poll it and ask if it has anything to say. This is how I have it now, but I cannot get the Master to read from the Slave.
2. Have a multi-master bus and have the second PIC write to the bus when needed (haven't tried this yet).
void I2C1_StatusCallback(I2C1_SLAVE_DRIVER_STATUS i2c_bus_state)
{
switch (i2c_bus_state)
{
case I2C1_SLAVE_WRITE_REQUEST:
messageForMe = (I2C1_targetAddress == I2C_Address);
// Address received, check if it's for me and reset message pointers
break;
case I2C1_SLAVE_WRITE_COMPLETED:
if (messageForMe)
{
// Receive Byte
I2C_Input.Buffer[I2C_Input.inPointer] = I2C1_slaveWriteData;
I2C_Input.inPointer = (I2C_Input.inPointer + 1) % BUFFER_SIZE;
if (I2C1_slaveWriteData == EOT) messageForMe = NO;
}
break;
case I2C1_SLAVE_READ_REQUEST:
// Send Message
if (I2C_Output.outPointer != I2C_Output.inPointer)
{
//MOTOR_REF_LED_ON();
SSP1BUF = I2C_Output.Buffer[I2C_Output.outPointer];
I2C_Output.outPointer = (I2C_Output.outPointer + 1) % BUFFER_SIZE;
}
else
{
//MOTOR_REF_LED_OFF();
SSP1BUF = EOT;
}
break;
case I2C1_SLAVE_READ_COMPLETED:
// Send Message
if (I2C_Output.outPointer != I2C_Output.inPointer)
{
MOTOR_REF_LED_ON();
SSP1BUF = I2C_Output.Buffer[I2C_Output.outPointer];
I2C_Output.outPointer = (I2C_Output.outPointer + 1) % BUFFER_SIZE;
}
else
{
MOTOR_REF_LED_OFF();
SSP1BUF = EOT;
}
break;
default:
break;
} // end switch(i2c_bus_state)
}
I'm attaching 3 files with the master and slave code and a 3rd file that is used by both boards with a #define to select stuff. The first 2 files are mostly code generated by MCC. I'm writing to SSP1BUF on the Slave side when a READ_REQUEST is received but I'm not being able to read that information on the Master side. And I'm not really sure how to modify the Master code to receive in a "Slave" condition if I want them to work as multi-master.

Any ideas will be very appreciated! Thank you in advance,
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I2C_Controller.zip (10.20 KB) - downloaded 53 times