libspicboard-Doku

com_ext.h
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1 /**
2  * \addtogroup COM_EXT Extended Serial Communication
3  *
4  * \brief Special operations for serial communication with SPiCboards
5  *
6  * \sa com_ext.h
7  *
8  * @{
9  * \file com_ext.h
10  * \version \$Rev: 15477 $
11  */
12 
13 #ifndef COM_EXT_H
14 #define COM_EXT_H
15 
16 /**
17  * \brief Set the baud rate (transmission frequence)
18  *
19  * The baud rate is the number of symbols to be transfered within one second.
20  * Hence this defines the transmission interval for a single symbol:
21  * \f$ T = \frac{1s}{BAUD\_RATE} \f$
22  *
23  * \warning In case your connection is instable you should propably
24  * consider a lower frequency!
25  *
26  * \param baud the desired baud rate
27  *
28  * \retval 4 using CPU frequency/1024 for timer
29  * \retval 3 using CPU frequency/256 for timer
30  * \retval 2 using CPU frequency/64 for timer
31  * \retval 1 using CPU frequency/8 for timer
32  * \retval 0 using CPU frequency for timer
33  * \retval -1 baud rate too high
34  * \retval -2 baud rate too low
35  * \retval -3 setting baud rate not supported (default BAUD_RATE is used)
36  */
37 int8_t sb_com_setBaud(uint32_t baud);
38 
39 
40 /**
41  * \brief Check if there is a new byte item in the receive buffer
42  *
43  * This method provides information if the next item has been received and
44  *
45  * In other words, a positive answer ensures that a call to
46  * sb_com_receiveByte() would return within the usual processing time
47  * (without the need to wait for the other communication end point to begin transmission).
48  *
49  * \retval 1 there is one item to receive
50  * \retval 0 currently no item to receive, would have to wait
51  */
52 uint8_t sb_com_hasReceivedItem();
53 
54 /** @}*/
55 
56 #endif
sb_com_setBaud
int8_t sb_com_setBaud(uint32_t baud)
Set the baud rate (transmission frequence)
sb_com_hasReceivedItem
uint8_t sb_com_hasReceivedItem()
Check if there is a new byte item in the receive buffer.