Asynchronous I2C Hardware Abstraction Layer

Functions
void	i2c_transfer_asynch (i2c_t *obj, const void *tx, size_t tx_length, void *rx, size_t rx_length, uint32_t address, uint32_t stop, uint32_t handler, uint32_t event, DMAUsage hint)
	Start I2C asynchronous transfer. More...
uint32_t	i2c_irq_handler_asynch (i2c_t *obj)
	The asynchronous IRQ handler. More...
uint8_t	i2c_active (i2c_t *obj)
	Attempts to determine if the I2C peripheral is already in use. More...
void	i2c_abort_asynch (i2c_t *obj)
	Abort asynchronous transfer. More...

Detailed Description

Function Documentation

i2c_transfer_asynch()

void i2c_transfer_asynch	(	i2c_t *	obj,
		const void *	tx,
		size_t	tx_length,
		void *	rx,
		size_t	rx_length,
		uint32_t	address,
		uint32_t	stop,
		uint32_t	handler,
		uint32_t	event,
		DMAUsage	hint
	)

Start I2C asynchronous transfer.

Parameters

obj	The I2C object
tx	The transmit buffer
tx_length	The number of bytes to transmit
rx	The receive buffer
rx_length	The number of bytes to receive
address	The address to be set - 8bit or 11bit
stop	If true, stop will be generated after the transfer is done
handler	The I2C IRQ handler to be set
event	Event mask for the transfer. See I2C Events Macros
hint	DMA hint usage

i2c_irq_handler_asynch()

uint32_t i2c_irq_handler_asynch

(

i2c_t *

obj

)

The asynchronous IRQ handler.

Parameters

obj	The I2C object which holds the transfer information

Returns

Event flags if a transfer termination condition was met, otherwise return 0.

i2c_active()

uint8_t i2c_active

(

i2c_t *

obj

)

Attempts to determine if the I2C peripheral is already in use.

Parameters

obj	The I2C object

Returns

Non-zero if the I2C module is active or zero if it is not

i2c_abort_asynch()

void i2c_abort_asynch

(

i2c_t *

obj

)

Abort asynchronous transfer.

This function does not perform any check - that should happen in upper layers.

Parameters

obj	The I2C object