Macros
#define	T2_TWI 5
	>4,7us

#define	T4_TWI 4
	>4,0us

#define	SIGNAL_VERIFY
	be on always. More...

#define	TWI_READ_BIT 0
	Bit position for R/W bit in "address byte".

#define	TWI_ADR_BITS 1
	Bit position for LSB of the slave address bits in the init byte.

#define	TWI_NACK_BIT 0
	Bit position for (N)ACK bit.

#define	USI_TWI_NO_DATA 0x08
	Transmission buffer is empty.

#define	USI_TWI_DATA_OUT_OF_BOUND 0x09
	Transmission buffer is outside SRAM space.

#define	USI_TWI_UE_START_CON 0x07
	Unexpected Start Condition.

#define	USI_TWI_UE_STOP_CON 0x06
	Unexpected Stop Condition.

#define	USI_TWI_UE_DATA_COL 0x05
	Unexpected Data Collision (arbitration)

#define	USI_TWI_NO_ACK_ON_DATA 0x02
	The slave did not acknowledge all data.

#define	USI_TWI_NO_ACK_ON_ADDRESS 0x01
	The slave did not acknowledge the address.

#define	USI_TWI_MISSING_START_CON 0x03
	Generated Start Condition not detected on bus.

#define	USI_TWI_MISSING_STOP_CON 0x04
	Generated Stop Condition not detected on bus.

#define	USI_TWI_BAD_MEM_READ 0x0A
	Error during external memory read.

#define	TRUE 1
	True.

#define	FALSE 0
	False.

Functions
void	USI_TWI_Master_Initialise (void)
	USI TWI single master initialization function.

unsigned char	USI_TWI_Start_Random_Read (unsigned char *, unsigned char)
	USI Random (memory) Read function. This function sets up for call to USI_TWI_Start_Transceiver_With_Data which does the work. Doesn't matter if read/write bit is set or cleared, it'll be set correctly in this function. More...

unsigned char	USI_TWI_Start_Read_Write (unsigned char *, unsigned char)
	USI Normal Read / Write Function Transmit and receive function. LSB of first byte in buffer indicates if a read or write cycles is performed. If set a read operation is performed. More...

unsigned char	USI_TWI_Master_Stop (void)
	Function for generating a TWI Stop Condition. Used to release the TWI bus. More...

unsigned char	USI_TWI_Get_State_Info (void)
	Use this function to get hold of the error message from the last transmission. More...

Macro Definition Documentation

◆ SIGNAL_VERIFY

#define SIGNAL_VERIFY

be on always.

Verifies the signal is correct. This should probably

Function Documentation

◆ USI_TWI_Start_Random_Read()

unsigned char USI_TWI_Start_Random_Read	(	unsigned char *	msg,
		unsigned char	msgSize
	)

USI Random (memory) Read function. This function sets up for call to USI_TWI_Start_Transceiver_With_Data which does the work. Doesn't matter if read/write bit is set or cleared, it'll be set correctly in this function.

The msgSize is passed to USI_TWI_Start_Transceiver_With_Data.

Success or error code is returned. Error codes are defined in USI_TWI_Master.h

Parameters

msg	Pointer to the buffer that contains the messages to be read
msgSize	How much to read from the buffer

Returns: Returns the message read

◆ USI_TWI_Start_Read_Write()

unsigned char USI_TWI_Start_Read_Write	(	unsigned char *	msg,
		unsigned char	msgSize
	)

USI Normal Read / Write Function Transmit and receive function. LSB of first byte in buffer indicates if a read or write cycles is performed. If set a read operation is performed.

Function generates (Repeated) Start Condition, sends address and R/W, Reads/Writes Data, and verifies/sends ACK.

Success or error code is returned. Error codes are defined in USI_TWI_Master.h

Parameters

msg	Pointer to the buffer that has the messages
msgSize	The size of the message

Returns: Returns the data read

◆ USI_TWI_Master_Stop()

unsigned char USI_TWI_Master_Stop ( void )

Function for generating a TWI Stop Condition. Used to release the TWI bus.

Returns: Returns true if it was successful

◆ USI_TWI_Get_State_Info()

unsigned char USI_TWI_Get_State_Info ( void )

Use this function to get hold of the error message from the last transmission.

Returns: Returns error state

Macros