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TI-RTOS Drivers
tidrivers_full_2_20_01_10
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I2CSlave driver interface.
============================================================================
The I2CSlave header file should be included in an application as follows:
The I2CSlave driver operates as a slave on an I2C bus in either I2CSLAVE_MODE_BLOCKING or I2CSLAVE_MODE_CALLBACK. In blocking mode, the task's execution is blocked during the I2CSlave read/write transfer. When the transfer has completed, code execution will resume. In callback mode, the task's execution is not blocked, allowing for other transactions to be queued up or to process some other code. When the transfer has completed, the I2CSlave driver will call a user-specified callback function (from a HWI context).
The APIs in this driver serve as an interface to a typical TI-RTOS application. The specific peripheral implementations are responsible to create all the SYS/BIOS specific primitives to allow for thread-safe operation.
A I2CSlave transaction with a I2CSlave peripheral is started by calling I2CSlave_read() or I2CSlave_write(). Each transfer is performed atomically with the I2CSlave peripheral.
This module serves as the main interface for TI-RTOS applications. Its purpose is to redirect the module's APIs to specific peripheral implementations which are specified using a pointer to a I2CSlave_FxnTable.
The I2CSlave driver interface module is joined (at link time) to a NULL-terminated array of I2CSlave_Config data structures named I2CSlave_config. I2CSlave_config is implemented in the application with each entry being an instance of a I2CSlave peripheral. Each entry in I2CSlave_config contains a:
The I2CSlave driver interface produces log statements if instrumentation is enabled.
Diagnostics Mask | Log details |
---|---|
Diags_USER1 | basic operations performed |
Diags_USER2 | detailed operations performed |
#include <stdint.h>
#include <stdbool.h>
#include <stddef.h>
Go to the source code of this file.
Data Structures | |
struct | I2CSlave_Params |
I2CSlave Parameters. More... | |
struct | I2CSlave_FxnTable |
The definition of a I2CSlave function table that contains the required set of functions to control a specific I2CSlave driver implementation. More... | |
struct | I2CSlave_Config |
I2CSlave Global configuration. More... | |
Macros | |
#define | I2CSLAVE_CMD_RESERVED 32 |
#define | I2CSLAVE_STATUS_RESERVED -32 |
#define | I2CSLAVE_STATUS_SUCCESS 0 |
Successful status code returned by I2CSlave_control(). More... | |
#define | I2CSLAVE_STATUS_ERROR -1 |
Generic error status code returned by I2CSlave_control(). More... | |
#define | I2CSLAVE_STATUS_UNDEFINEDCMD -2 |
An error status code returned by I2CSlave_control() for undefined command codes. More... | |
Typedefs | |
typedef struct I2CSlave_Config * | I2CSlave_Handle |
A handle that is returned from a I2CSlave_open() call. More... | |
typedef enum I2CSlave_Mode | I2CSlave_Mode |
I2CSlave mode. More... | |
typedef enum I2CSlave_TransferMode | I2CSlave_TransferMode |
I2CSlave transfer mode. More... | |
typedef void(* | I2CSlave_CallbackFxn) (I2CSlave_Handle, bool) |
I2CSlave callback function. More... | |
typedef struct I2CSlave_Params | I2CSlave_Params |
I2CSlave Parameters. More... | |
typedef void(* | I2CSlave_CloseFxn) (I2CSlave_Handle handle) |
A function pointer to a driver specific implementation of I2CSlave_close(). More... | |
typedef int(* | I2CSlave_ControlFxn) (I2CSlave_Handle handle, unsigned int cmd, void *arg) |
A function pointer to a driver specific implementation of I2CSlave_control(). More... | |
typedef void(* | I2CSlave_InitFxn) (I2CSlave_Handle handle) |
A function pointer to a driver specific implementation of I2CSlave_init(). More... | |
typedef I2CSlave_Handle(* | I2CSlave_OpenFxn) (I2CSlave_Handle handle, I2CSlave_Params *params) |
A function pointer to a driver specific implementation of I2CSlave_open(). More... | |
typedef bool(* | I2CSlave_WriteFxn) (I2CSlave_Handle handle, const void *buffer, size_t size) |
A function pointer to a driver specific implementation of I2CSlave_WriteTransaction(). More... | |
typedef bool(* | I2CSlave_ReadFxn) (I2CSlave_Handle handle, void *buffer, size_t size) |
A function pointer to a driver specific implementation of I2CSlave_ReadFxn(). More... | |
typedef struct I2CSlave_FxnTable | I2CSlave_FxnTable |
The definition of a I2CSlave function table that contains the required set of functions to control a specific I2CSlave driver implementation. More... | |
typedef struct I2CSlave_Config | I2CSlave_Config |
I2CSlave Global configuration. More... | |
Enumerations | |
enum | I2CSlave_Mode { I2CSLAVE_IDLE_MODE = 0, I2CSLAVE_WRITE_MODE, I2CSLAVE_READ_MODE, I2CSLAVE_START_MODE, I2CSLAVE_ERROR = 0xFF } |
I2CSlave mode. More... | |
enum | I2CSlave_TransferMode { I2CSLAVE_MODE_BLOCKING, I2CSLAVE_MODE_CALLBACK } |
I2CSlave transfer mode. More... | |
Functions | |
void | I2CSlave_close (I2CSlave_Handle handle) |
Function to close a I2CSlave peripheral specified by the I2CSlave handle. More... | |
int | I2CSlave_control (I2CSlave_Handle handle, unsigned int cmd, void *arg) |
Function performs implementation specific features on a given I2CSlave_Handle. More... | |
void | I2CSlave_init (void) |
Function to initializes the I2CSlave module. More... | |
I2CSlave_Handle | I2CSlave_open (unsigned int index, I2CSlave_Params *params) |
Function to initialize a given I2CSlave peripheral specified by the particular index value. The parameter specifies which mode the I2CSlave will operate. More... | |
void | I2CSlave_Params_init (I2CSlave_Params *params) |
Function to initialize the I2CSlave_Params struct to its defaults. More... | |
bool | I2CSlave_read (I2CSlave_Handle handle, void *buffer, size_t size) |
Function that handles the I2CSlave read for SYS/BIOS. More... | |
bool | I2CSlave_write (I2CSlave_Handle handle, const void *buffer, size_t size) |
Function that handles the I2CSlave write for SYS/BIOS. More... | |
#define I2CSLAVE_CMD_RESERVED 32 |
Common I2CSlave_control command code reservation offset. I2CSlave driver implementations should offset command codes with I2CSLAVE_CMD_RESERVED growing positively
Example implementation specific command codes:
#define I2CSLAVE_STATUS_RESERVED -32 |
Common I2CSlave_control status code reservation offset. I2CSlave driver implementations should offset status codes with I2CSLAVE_STATUS_RESERVED growing negatively.
Example implementation specific status codes:
#define I2CSLAVE_STATUS_SUCCESS 0 |
Successful status code returned by I2CSlave_control().
I2CSlave_control() returns I2CSLAVE_STATUS_SUCCESS if the control code was executed successfully.
#define I2CSLAVE_STATUS_ERROR -1 |
Generic error status code returned by I2CSlave_control().
I2CSlave_control() returns I2CSLAVE_STATUS_ERROR if the control code was not executed successfully.
#define I2CSLAVE_STATUS_UNDEFINEDCMD -2 |
An error status code returned by I2CSlave_control() for undefined command codes.
I2CSlave_control() returns I2CSLAVE_STATUS_UNDEFINEDCMD if the control code is not recognized by the driver implementation.
typedef struct I2CSlave_Config* I2CSlave_Handle |
A handle that is returned from a I2CSlave_open() call.
typedef enum I2CSlave_Mode I2CSlave_Mode |
I2CSlave mode.
This enum defines the state of the I2CSlave driver's state-machine. Do not modify.
typedef enum I2CSlave_TransferMode I2CSlave_TransferMode |
I2CSlave transfer mode.
I2CSLAVE_MODE_BLOCKING block task execution a I2CSlave transfer is in progress. I2CSLAVE_MODE_CALLBACK does not block task execution; but calls a callback function when the I2CSlave transfer has completed
typedef void(* I2CSlave_CallbackFxn) (I2CSlave_Handle, bool) |
I2CSlave callback function.
User definable callback function prototype. The I2CSlave driver will call the defined function and pass in the I2CSlave driver's handle, and the return value of I2CSlave_read/I2CSlave_write.
I2CSlave_Handle | I2CSlave_Handle |
bool | Results of the I2CSlave transaction |
typedef struct I2CSlave_Params I2CSlave_Params |
I2CSlave Parameters.
I2CSlave parameters are used to with the I2CSlave_open() call. Default values for these parameters are set using I2CSlave_Params_init().
If I2CSlave_TransferMode is set to I2CSLAVE_MODE_BLOCKING then I2CSlave_read or I2CSlave_write function calls will block thread execution until the transaction has completed.
If I2CSlave_TransferMode is set to I2CSLAVE_MODE_CALLBACK then I2CSlave read/write will not block thread execution and it will call the function specified by transferCallbackFxn. (regardless of error state).
typedef void(* I2CSlave_CloseFxn) (I2CSlave_Handle handle) |
A function pointer to a driver specific implementation of I2CSlave_close().
typedef int(* I2CSlave_ControlFxn) (I2CSlave_Handle handle, unsigned int cmd, void *arg) |
A function pointer to a driver specific implementation of I2CSlave_control().
typedef void(* I2CSlave_InitFxn) (I2CSlave_Handle handle) |
A function pointer to a driver specific implementation of I2CSlave_init().
typedef I2CSlave_Handle(* I2CSlave_OpenFxn) (I2CSlave_Handle handle, I2CSlave_Params *params) |
A function pointer to a driver specific implementation of I2CSlave_open().
typedef bool(* I2CSlave_WriteFxn) (I2CSlave_Handle handle, const void *buffer, size_t size) |
A function pointer to a driver specific implementation of I2CSlave_WriteTransaction().
typedef bool(* I2CSlave_ReadFxn) (I2CSlave_Handle handle, void *buffer, size_t size) |
A function pointer to a driver specific implementation of I2CSlave_ReadFxn().
typedef struct I2CSlave_FxnTable I2CSlave_FxnTable |
The definition of a I2CSlave function table that contains the required set of functions to control a specific I2CSlave driver implementation.
typedef struct I2CSlave_Config I2CSlave_Config |
I2CSlave Global configuration.
The I2CSlave_Config structure contains a set of pointers used to characterize the I2CSlave driver implementation.
This structure needs to be defined before calling I2CSlave_init() and it must not be changed thereafter.
enum I2CSlave_Mode |
I2CSlave transfer mode.
I2CSLAVE_MODE_BLOCKING block task execution a I2CSlave transfer is in progress. I2CSLAVE_MODE_CALLBACK does not block task execution; but calls a callback function when the I2CSlave transfer has completed
Enumerator | |
---|---|
I2CSLAVE_MODE_BLOCKING |
I2CSlave read/write blocks execution |
I2CSLAVE_MODE_CALLBACK |
I2CSlave read/wrire queues transactions and does not block |
void I2CSlave_close | ( | I2CSlave_Handle | handle | ) |
Function to close a I2CSlave peripheral specified by the I2CSlave handle.
handle | A I2CSlave_Handle returned from I2CSlave_open |
int I2CSlave_control | ( | I2CSlave_Handle | handle, |
unsigned int | cmd, | ||
void * | arg | ||
) |
Function performs implementation specific features on a given I2CSlave_Handle.
handle | A I2CSlave handle returned from I2CSlave_open() |
cmd | A command value defined by the driver specific implementation |
arg | An optional R/W (read/write) argument that is accompanied with cmd |
void I2CSlave_init | ( | void | ) |
Function to initializes the I2CSlave module.
I2CSlave_Handle I2CSlave_open | ( | unsigned int | index, |
I2CSlave_Params * | params | ||
) |
Function to initialize a given I2CSlave peripheral specified by the particular index value. The parameter specifies which mode the I2CSlave will operate.
index | Logical peripheral number for the I2CSlave indexed into the I2CSlave_config table |
params | Pointer to an parameter block, if NULL it will use default values. All the fields in this structure are RO (read-only). |
void I2CSlave_Params_init | ( | I2CSlave_Params * | params | ) |
Function to initialize the I2CSlave_Params struct to its defaults.
params | An pointer to I2CSlave_Params structure for initialization |
Defaults values are: transferMode = I2CSLAVE_MODE_BLOCKING transferCallbackFxn = NULL
bool I2CSlave_read | ( | I2CSlave_Handle | handle, |
void * | buffer, | ||
size_t | size | ||
) |
Function that handles the I2CSlave read for SYS/BIOS.
This function will start a I2CSlave read and can only be called from a Task context when in I2CSLAVE_MODE_BLOCKING. The I2CSlave read procedure starts with evaluating how many bytes are to be readby the I2CSlave peripheral.
The data written by the I2CSlave is synchronized with the START and STOP from the master.
In I2CSLAVE_MODE_BLOCKING, I2CSlave read/write will block task execution until the transaction has completed.
In I2CSLAVE_MODE_CALLBACK, I2CSlave read/write does not block task execution and calls a callback function specified by transferCallbackFxn. If a transfer is already taking place, the transaction is put on an internal queue. The queue is serviced in a first come first served basis.
handle | A I2CSlave_Handle |
buffer | A RO (read-only) pointer to an empty buffer in which received data should be written to. |
size | The number of bytes to be written into buffer |
bool I2CSlave_write | ( | I2CSlave_Handle | handle, |
const void * | buffer, | ||
size_t | size | ||
) |
Function that handles the I2CSlave write for SYS/BIOS.
This function will start a I2CSlave write and can only be called from a Task context when in I2CSLAVE_MODE_BLOCKING. The I2CSlave transfer procedure starts with evaluating how many bytes are to be written.
The data written by the I2CSlave is synchronized with the START and STOP from the master. If slave does not have as many bytes requested by master it writes 0xFF. I2CSlave keeps sending 0xFF till master sends a STOP.
In I2CSLAVE_MODE_BLOCKING, I2CSlave read/write will block task execution until the transaction has completed.
In I2CSLAVE_MODE_CALLBACK, I2CSlave read/write does not block task execution and calls a callback function specified by transferCallbackFxn. If a transfer is already taking place, the transaction is put on an internal queue. The queue is serviced in a first come first served basis. The I2CSlave_Transaction structure must stay persistent until the I2CSlave read/write function has completed!
handle | A I2CSlave_Handle |
buffer | A WO (write-only) pointer to buffer containing data to be written to the master. |
size | The number of bytes in buffer that should be written onto the master. |