twi_master.c File Reference

#include <avr/io.h>
#include <avr/interrupt.h>
#include "qdebug_transport.h"
#include "twi_master.h"

Functions
	switch (TWSR)
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
volatile unsigned char	FrameInProgress
	This Interrupt Service Routine (ISR)is called when the TWI interrupt is triggered; Whenever a TWI event has occurred. More...
static unsigned char	TWI_addr
static unsigned int	TWI_msgSize
union TWI_statusReg	TWI_statusReg = {0}

switch

(

TWSR

)

References TWI_statusReg::lastTransOK, RxHandler(), TRUE, TWI_addr, TWI_ARB_LOST, TWI_BUS_ERROR, TWI_MRX_ADR_ACK, TWI_MRX_ADR_NACK, TWI_MRX_DATA_ACK, TWI_MRX_DATA_NACK, TWI_msgSize, TWI_MTX_ADR_ACK, TWI_MTX_ADR_NACK, TWI_MTX_DATA_ACK, TWI_MTX_DATA_NACK, TWI_REP_START, TWI_START, and TX_Buffer.

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().

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().

unsigned char twi_transceiver_busy

(

void

)

Call this function to test if the TWI_ISR is busy transmitting.

Referenced by twi_retrieve_message(), and twi_send_message().

volatile unsigned char FrameInProgress

Initial value:

{
  static unsigned int TWI_bufPtr

This Interrupt Service Routine (ISR)is called when the TWI interrupt is triggered; Whenever a TWI event has occurred.

TWINT is not cleared automatically, but must be cleared manually in the ISR.

unsigned char TWI_addr

static

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

unsigned int TWI_msgSize

static

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

union TWI_statusReg TWI_statusReg = {0}