#include <string.h>
#include <dev/irqreg.h>
#include <sys/event.h>
#include <sys/atom.h>
#include <sys/timer.h>
#include <sys/thread.h>
#include <sys/heap.h>
#include <dev/twif.h>
Go to the source code of this file.
Defines | |
#define | TWGO (_BV(TWINT) | _BV(TWEN) | _BV(TWIE)) |
Functions | |
int | TwMasterTransact (uint8_t sla, CONST void *txdata, uint16_t txlen, void *rxdata, uint16_t rxsiz, uint32_t tmo) |
Transmit and/or receive data as a master. | |
int | TwMasterError (void) |
Get last master mode error. | |
int | TwSlaveListen (uint8_t *sla, void *rxdata, uint16_t rxsiz, uint32_t tmo) |
Listen for incoming data from a master. | |
int | TwSlaveRespond (void *txdata, uint16_t txlen, uint32_t tmo) |
Send response to a master. | |
int | TwSlaveError (void) |
Get last slave mode error. | |
int | TwIOCtl (int req, void *conf) |
Perform TWI control functions. | |
int | TwInit (uint8_t sla) |
Initialize TWI interface. | |
Variables | |
HANDLE | tw_mm_mutex |
HANDLE | tw_mm_que |
HANDLE | tw_sr_que |
HANDLE | tw_st_que |
#define TWGO (_BV(TWINT) | _BV(TWEN) | _BV(TWIE)) |
Definition at line 143 of file twif.c.
Referenced by TwSlaveRespond().
Listen for incoming data from a master.
If this function returns without error, the bus is blocked. The caller must immediately process the request and return a response by calling TwSlaveRespond().
sla | Points to a byte variable, which receives the slave address sent by the master. This can be used by the caller to determine whether the the interface has been addressed by a general call or its individual address. |
rxdata | Points to a data buffer where the received data bytes are stored. |
rxsiz | Specifies the maximum number of data bytes to receive. |
tmo | Timeout in milliseconds. To disable timeout, set this parameter to NUT_WAIT_INFINITE. |
Definition at line 653 of file twif.c.
References _BV, inb, NutEnterCritical, NutEventWait(), NutExitCritical, outb, SIGNALED, tw_sr_que, and TWERR_TIMEOUT.
Send response to a master.
This function must be called as soon as possible after TwSlaveListen() returned successfully, even if no data needs to be returned. Not doing so will completely block the bus.
txdata | Points to the data to transmit. Ignored, if the number of bytes to transmit is zero. |
txlen | Number of data bytes to transmit. |
tmo | Timeout in milliseconds. To disable timeout, set this parameter to NUT_WAIT_INFINITE. |
Definition at line 727 of file twif.c.
References _BV, inb, NutEnterCritical, NutEventWait(), NutExitCritical, outb, SIGNALED, tw_st_que, TWERR_TIMEOUT, and TWGO.
int TwSlaveError | ( | void | ) |
Get last slave mode error.
You may call this function to determine the specific cause of an error after TwSlaveListen() or TwSlaveRespond() failed.
Definition at line 109 of file twif.c.
Referenced by TwInit(), TwMasterRegRead(), TwMasterRegWrite(), and TwMasterTransact().
Definition at line 110 of file twif.c.
Referenced by TwMasterRegRead(), TwMasterRegWrite(), and TwMasterTransact().
Definition at line 111 of file twif.c.
Referenced by TwSlaveListen().
Definition at line 112 of file twif.c.
Referenced by TwSlaveRespond().