Microchip® Advanced Software Framework

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Data Structures
union	TWI_statusReg

Macros
#define	BAUDRATE 100000

#define	CPU_SPEED 16000000
	CPU speed 2MHz, BAUDRATE 100kHz and Baudrate Register Settings. More...

#define	FALSE 0

#define	TRUE 1

#define	TWI_ADR_BITS 1

#define	TWI_ARB_LOST 0x38

#define	TWI_BAUD(F_SYS, F_TWI) (((F_SYS / F_TWI )-16)/ 2)

#define	TWI_BAUDSETTING TWI_BAUD(CPU_SPEED, BAUDRATE)

#define	TWI_BUFFER_SIZE 275

#define	TWI_BUS_ERROR 0x00

#define	TWI_GEN_CALL 0x00

#define	TWI_MRX_ADR_ACK 0x40

#define	TWI_MRX_ADR_NACK 0x48

#define	TWI_MRX_DATA_ACK 0x50

#define	TWI_MRX_DATA_NACK 0x58

#define	TWI_MTX_ADR_ACK 0x18

#define	TWI_MTX_ADR_NACK 0x20

#define	TWI_MTX_DATA_ACK 0x28

#define	TWI_MTX_DATA_NACK 0x30

#define	TWI_NO_STATE 0xF8

#define	TWI_READ_BIT 0

#define	TWI_REP_START 0x10

#define	TWI_SRX_ADR_ACK 0x60

#define	TWI_SRX_ADR_ACK_M_ARB_LOST 0x68

#define	TWI_SRX_ADR_DATA_ACK 0x80

#define	TWI_SRX_ADR_DATA_NACK 0x88

#define	TWI_SRX_GEN_ACK 0x70

#define	TWI_SRX_GEN_ACK_M_ARB_LOST 0x78

#define	TWI_SRX_GEN_DATA_ACK 0x90

#define	TWI_SRX_GEN_DATA_NACK 0x98

#define	TWI_SRX_STOP_RESTART 0xA0

#define	TWI_START 0x08

#define	TWI_STX_ADR_ACK 0xA8

#define	TWI_STX_ADR_ACK_M_ARB_LOST 0xB0

#define	TWI_STX_DATA_ACK 0xB8

#define	TWI_STX_DATA_ACK_LAST_BYTE 0xC8

#define	TWI_STX_DATA_NACK 0xC0

#define	TWISLAVE_ADDR 0x10

Functions
void	twi_master_init (void)
	Call this function to set up the TWI master to its initial standby state. More...

void	twi_retrieve_message (void)
	To Receive data over TWI. More...

void	twi_send_message (void)
	To Transmit data over TWI. More...

unsigned char	twi_transceiver_busy (void)
	Call this function to test if the TWI_ISR is busy transmitting. More...

Variables
union TWI_statusReg	TWI_statusReg

#define BAUDRATE 100000

#define CPU_SPEED 16000000

CPU speed 2MHz, BAUDRATE 100kHz and Baudrate Register Settings.

#define FALSE 0

#define TRUE 1

#define TWI_ADR_BITS 1

Referenced by twi_retrieve_message(), twi_send_message(), and twi_start_transceiver_with_data().

#define TWI_ARB_LOST 0x38

Referenced by switch().

#define TWI_BAUD	(		F_SYS,
			F_TWI
	)		(((F_SYS / F_TWI )-16)/ 2)

Baud register setting calculation. Formula described in datasheet.

#define TWI_BAUDSETTING TWI_BAUD(CPU_SPEED, BAUDRATE)

Referenced by twi_master_init().

#define TWI_BUFFER_SIZE 275

#define TWI_BUS_ERROR 0x00

Referenced by switch().

#define TWI_GEN_CALL 0x00

#define TWI_MRX_ADR_ACK 0x40

Referenced by switch().

#define TWI_MRX_ADR_NACK 0x48

Referenced by switch().

#define TWI_MRX_DATA_ACK 0x50

Referenced by switch().

#define TWI_MRX_DATA_NACK 0x58

Referenced by switch().

#define TWI_MTX_ADR_ACK 0x18

Referenced by switch().

#define TWI_MTX_ADR_NACK 0x20

Referenced by switch().

#define TWI_MTX_DATA_ACK 0x28

Referenced by switch().

#define TWI_MTX_DATA_NACK 0x30

Referenced by switch().

#define TWI_NO_STATE 0xF8

Referenced by twi_start_transceiver(), and twi_start_transceiver_with_data().

#define TWI_READ_BIT 0

Referenced by twi_retrieve_message(), twi_send_message(), and twi_start_transceiver_with_data().

#define TWI_REP_START 0x10

Referenced by switch().

#define TWI_SRX_ADR_ACK 0x60

#define TWI_SRX_ADR_ACK_M_ARB_LOST 0x68

#define TWI_SRX_ADR_DATA_ACK 0x80

#define TWI_SRX_ADR_DATA_NACK 0x88

#define TWI_SRX_GEN_ACK 0x70

#define TWI_SRX_GEN_ACK_M_ARB_LOST 0x78

#define TWI_SRX_GEN_DATA_ACK 0x90

#define TWI_SRX_GEN_DATA_NACK 0x98

#define TWI_SRX_STOP_RESTART 0xA0

#define TWI_START 0x08

Referenced by switch().

#define TWI_STX_ADR_ACK 0xA8

#define TWI_STX_ADR_ACK_M_ARB_LOST 0xB0

#define TWI_STX_DATA_ACK 0xB8

#define TWI_STX_DATA_ACK_LAST_BYTE 0xC8

#define TWI_STX_DATA_NACK 0xC0

#define TWISLAVE_ADDR 0x10

Referenced by twi_retrieve_message(), and twi_send_message().

void twi_master_init ( void )

Call this function to set up the TWI master to its initial standby state.

Remember to enable interrupts from the main application after initializing the TWI.

References TWI_BAUDSETTING.

Referenced by main(), run_twi_master_recv_test(), run_twi_master_send_test(), and twi_master_setup().

void twi_retrieve_message ( void )

To Receive data over TWI.

References TWI_statusReg::all, TWI_statusReg::lastTransOK, RX_Buffer, TRUE, TWI_addr, TWI_ADR_BITS, TWI_msgSize, TWI_READ_BIT, twi_transceiver_busy(), and TWISLAVE_ADDR.

Referenced by Receive_Message().

void twi_send_message ( void )

To Transmit data over TWI.

References TWI_statusReg::all, FALSE, TWI_addr, TWI_ADR_BITS, TWI_msgSize, TWI_READ_BIT, twi_transceiver_busy(), TWISLAVE_ADDR, and TX_Buffer.

Referenced by main(), and Send_Message().

union TWI_statusReg TWI_statusReg