Bit banging two wire interface. More...
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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. |
Bit banging two wire interface.
Tested with AT91R40008 only. Other ARMs or AVR may not work.
* * $Log$ * Revision 1.11 2008/08/11 06:59:42 haraldkipp * BSD types replaced by stdint types (feature request #1282721). * * Revision 1.10 2008/02/15 17:04:49 haraldkipp * Spport for AT91SAM7SE512 added. * * Revision 1.9 2007/10/04 20:16:57 olereinhardt * Support for SAM7S256 added * * Revision 1.8 2007/07/09 13:38:50 olereinhardt * 2007-07-09 Ole Reinhardt <ole.reinhardt@embedded-it.de> * * dev/twbbif.c: Added default TWI_DELAY for avr architecture * to allow in-tree compilation * * net/Makefile: Commented out igmp support as long as it does * not exists to allow in-tree compilation * * Revision 1.7 2007/02/15 16:25:40 haraldkipp * Configurable port bits. Should work now on all AT91 MCUs. * * Revision 1.6 2006/10/08 16:48:09 haraldkipp * Documentation fixed * * Revision 1.5 2006/06/28 17:10:35 haraldkipp * Include more general header file for ARM. * * Revision 1.4 2006/05/25 09:30:23 haraldkipp * Compiles for AVR. Still not tested, though. * * Revision 1.3 2006/04/07 12:50:20 haraldkipp * Added additional delays in TwAck. * Clock and data forced to high before switching to input gives better * waveforms. * Additional delay added to set clock to 50% duty cycle. The PCF8563 * seems to fail, if the clock's high time is much longer than the low time. * * Revision 1.2 2006/01/23 17:32:35 haraldkipp * Automatic initialization added. * * Revision 1.1 2005/10/24 10:21:57 haraldkipp * Initial check in. * * *
Definition in file twbbif.c.
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. |
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. |
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 699 of file twbbif.c.
References TWERR_BUS.