- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Hello,
Please tell me how to implement a simple I2C slave application.
I want to make a I2C slave application using PSoC 5LP.
Attaching project is a simple I2C slave project file.
Connecting PSoC with I2C Master with two pullup registers, I monitored signal line by the oscilloscope.
No signal was founded and slave status was always 0.
The I2C master was working when I connected another I2C slave module.
Thank you.
Solved! Go to Solution.
- Labels:
-
PSoC 5 Device Programming
-
PSoC 5LP
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
The slave cannot send data to the master, only the master can read from the slave.
Byte I2C interface is quite simple: After setting up the component and starting it you use
I2C_MasterSendStart(DeviceAddress,I2C_WRITE_XFER_MODE); // Initialize a transaction for writing
I2C_MasterWriteByte(Register); // Indicate which register you want to write to
I2C_MasterWriteByte(Value); // Write to register
I2C_MasterSendStop(); // End of transaction
When you want to read from a device you use (example for reading two bytes
I2C_MasterSendStart(DeviceAddress,I2C_WRITE_XFER_MODE); // Initialize a transaction for writing
I2C_MasterWrite(Register); // Indicate which register you want to write to
I2C_MasterSendRestart(DeviceAddress,I2C_READ_XFER_MODE);
I2C_MasterReadByte(I2C_ACK_DATA); // Read from register
I2C_MasterReadByte(I2C_NAK_DATA); // Read from register, last byte is NAKed
I2C_MasterSendStop(); // End of transaction
Not too difficult. Keep in mind that most of the APIs (except those for reading a byte) return a status byte which, when non-zero indicate an error condition.
The high-level APIs must be used in this way:
Writing to slave Count bytes
I2C_MasterWriteBuf(SlaveAddress,DataPtr,Count,I2C_MODE_COMPLETE_XFER);
Reading from Slave sending register/command byte first:
I2C_MasterWriteBuf(SlaveAddress,&RegAddress,1,I2C_MODE_NO_STOP);
I2C_MasterReadBuf(SlaveAddress,DataPtr,Count,I2C_MODE_REPEAT_START);
Bob
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
When you are using a CY8CKIT-059: Pin p0_3 has a bypass cap that will not work as I2C terminal.
Bob
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Dear Bob,
Thank you for your comment.
I could get the data from I2C Master when I changed the I2C pin.
The slave can get the data from the master, but can't send the data to the master.
The maste don't get correct data.
Could you give an advice about data sending to the maseter?
Thank you,
Yuya
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
The slave cannot send data to the master, only the master can read from the slave.
Byte I2C interface is quite simple: After setting up the component and starting it you use
I2C_MasterSendStart(DeviceAddress,I2C_WRITE_XFER_MODE); // Initialize a transaction for writing
I2C_MasterWriteByte(Register); // Indicate which register you want to write to
I2C_MasterWriteByte(Value); // Write to register
I2C_MasterSendStop(); // End of transaction
When you want to read from a device you use (example for reading two bytes
I2C_MasterSendStart(DeviceAddress,I2C_WRITE_XFER_MODE); // Initialize a transaction for writing
I2C_MasterWrite(Register); // Indicate which register you want to write to
I2C_MasterSendRestart(DeviceAddress,I2C_READ_XFER_MODE);
I2C_MasterReadByte(I2C_ACK_DATA); // Read from register
I2C_MasterReadByte(I2C_NAK_DATA); // Read from register, last byte is NAKed
I2C_MasterSendStop(); // End of transaction
Not too difficult. Keep in mind that most of the APIs (except those for reading a byte) return a status byte which, when non-zero indicate an error condition.
The high-level APIs must be used in this way:
Writing to slave Count bytes
I2C_MasterWriteBuf(SlaveAddress,DataPtr,Count,I2C_MODE_COMPLETE_XFER);
Reading from Slave sending register/command byte first:
I2C_MasterWriteBuf(SlaveAddress,&RegAddress,1,I2C_MODE_NO_STOP);
I2C_MasterReadBuf(SlaveAddress,DataPtr,Count,I2C_MODE_REPEAT_START);
Bob