LTC Non-blocking eDMA APIs

Overview

This section describes the programming interface of the LTC eDMA Non Blocking functions

Modules
	LTC eDMA AES driver
	LTC eDMA DES driver

Data Structures
struct	ltc_edma_handle_t
	LTC eDMA handle. More...

Typedefs
typedef void(*	ltc_edma_callback_t )(LTC_Type *base, ltc_edma_handle_t *handle, status_t status, void *userData)
	LTC eDMA callback function. More...
typedef status_t(*	ltc_edma_state_machine_t )(LTC_Type *base, ltc_edma_handle_t *handle)
	LTC eDMA state machine function. More...

Functions
void	LTC_CreateHandleEDMA (LTC_Type *base, ltc_edma_handle_t *handle, ltc_edma_callback_t callback, void *userData, edma_handle_t *inputFifoEdmaHandle, edma_handle_t *outputFifoEdmaHandle)
	Init the LTC eDMA handle which is used in transcational functions. More...

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Data Structure Documentation

struct _ltc_edma_handle

It is defined only for private usage inside LTC eDMA driver.

Data Fields
ltc_edma_callback_t	callback
	Callback function. More...
void *	userData
	LTC callback function parameter. More...
edma_handle_t *	inputFifoEdmaHandle
	The eDMA TX channel used. More...
edma_handle_t *	outputFifoEdmaHandle
	The eDMA RX channel used. More...
ltc_edma_state_machine_t	state_machine
	State machine. More...
uint32_t	state
	Internal state. More...
const uint8_t *	inData
	Input data. More...
uint8_t *	outData
	Output data. More...
uint32_t	size
	Size of input and output data in bytes. More...
uint32_t	modeReg
	LTC mode register. More...
uint8_t *	counter
	Input counter (updates on return)
const uint8_t *	key
	Input key to use for forward AES cipher.
uint32_t	keySize
	Size of the input key, in bytes. More...
uint8_t *	counterlast
	Output cipher of last counter, for chained CTR calls. More...
uint32_t *	szLeft
	Output number of bytes in left unused in counterlast block. More...
uint32_t	lastSize
	Last size. More...

Field Documentation

ltc_edma_callback_t ltc_edma_handle_t::callback

void* ltc_edma_handle_t::userData

edma_handle_t* ltc_edma_handle_t::inputFifoEdmaHandle

edma_handle_t* ltc_edma_handle_t::outputFifoEdmaHandle

ltc_edma_state_machine_t ltc_edma_handle_t::state_machine

uint32_t ltc_edma_handle_t::state

const uint8_t* ltc_edma_handle_t::inData

uint8_t* ltc_edma_handle_t::outData

uint32_t ltc_edma_handle_t::size

uint32_t ltc_edma_handle_t::modeReg

uint32_t ltc_edma_handle_t::keySize

Must be 16, 24, or 32.

uint8_t* ltc_edma_handle_t::counterlast

NULL can be passed if chained calls are not used.

uint32_t* ltc_edma_handle_t::szLeft

NULL can be passed if chained calls are not used.

uint32_t ltc_edma_handle_t::lastSize

Typedef Documentation

typedef void(* ltc_edma_callback_t)(LTC_Type *base, ltc_edma_handle_t *handle, status_t status, void *userData)

typedef status_t(* ltc_edma_state_machine_t)(LTC_Type *base, ltc_edma_handle_t *handle)

It is defined only for private usage inside LTC eDMA driver.

Function Documentation

void LTC_CreateHandleEDMA	(	LTC_Type *	base,
		ltc_edma_handle_t *	handle,
		ltc_edma_callback_t	callback,
		void *	userData,
		edma_handle_t *	inputFifoEdmaHandle,
		edma_handle_t *	outputFifoEdmaHandle
	)

Parameters

base	LTC module base address
handle	Pointer to ltc_edma_handle_t structure
callback	Callback function, NULL means no callback.
userData	Callback function parameter.
inputFifoEdmaHandle	User requested eDMA handle for Input FIFO eDMA.
outputFifoEdmaHandle	User requested eDMA handle for Output FIFO eDMA.