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F1 Evaluation Platform User’s Guide
5.6
USING THE I 2 C? DRIVER
The supplied software includes an I 2 C Master mode driver with the following features:
1.
2.
3.
4.
5.
6.
Interrupt driven or polled
Queued requests
Minimum memory requirements
Uses Restart to maximize bus bandwidth
Multiple atomic I 2 C transactions allowed at each queue entry
Completion flag for each queued block of I 2 C commands.
5.6.1
I 2 C Data Structures
Two data structures are defined to simplify interactions with the I 2 C driver.
5.6.1.1 I2C_RESULTS_T
The I2C_RESULTS_T is an enumerated type with the following enumerations:
TABLE 5-1:
I2C_RESULTS_T
I2C_REQUEST_PENDING
I2C_REQUEST_COMPLETE
I2C_REQUEST_STUCK_START
I2C_REQUEST_ADDRESS_NO_ACK
I2C_REQUEST_DATA_NO_ACK
I2C_REQUEST_LOST_STATE
Request is in the queue or in process but it is not
done.
The request is finished successfully.
The request was aborted. The start condition did
not clear correctly.
The request was aborted. No ACK occurred on
the address, so the target device must not exist
or is not functioning.
The request was aborted. Not all of the data
could be sent because the device did not ACK a
byte.
The I 2 C state machine had a RAM corruption
and the default case caught the failure. This will
infinite loop so you should never see it.
The data completion flag for an I 2 C request is of type I2C_RESULTS_T . This flag will
be I2C_REQUEST_PENDING until the request is complete. If the request completed
without errors, the value will be I2C_REQUEST_COMPLETE . If there were errors, the
value will reflect one of the other 4 error conditions.
5.6.1.2 I2C_T
The I2C_T is a structure representing one transaction on the I 2 C bus. A transaction
contains the following elements:
1. A 7- or 10-bit address. Address type is determined automatically by the driver.
R/W mode is implicit in the address and specified by bit 0 .
2. An 8-bit baud rate. This is the value placed in SPADD. Predefined constants are
included that compute the SPADD value given an FOSC value. Set FOSC with
a #define before #including the I2C.h file.
3. A buffer_length . This is the number of bytes available for reading or writing
at the supplied data buffer.
4. A Buffer Pointer. Your application will allocate a block of memory for an I 2 C
transaction. Pass a pointer to this block via the Buffer Pointer. The block must
remain valid until the transaction is complete (i.e. if you allocate the block as a
non-static array within a function, you must not leave the function until the I 2 C
transaction is complete or the array may be reused by a different function).
DS41401A-page 22
? 2009 Microchip Technology Inc.
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