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updated can_send_now in docu

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Milanka Ringwald 2015-07-03 14:20:44 +02:00
parent 6f692ea796
commit 15d0eaf5d9
1 changed files with 8 additions and 16 deletions
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24
docs/manual/docs/protocols.md
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@ -463,10 +463,7 @@ assumption, the single output buffer design does not impose additional
restrictions. In the following, we show how this is used for adapting restrictions. In the following, we show how this is used for adapting
the RFCOMM send rate. the RFCOMM send rate.
BTstack returns BTSTACK_ACL_BUFFERS_FULL, if the outgoing buffer is Before sending data packets, check if RFCOMM can send them by calling rfcomm_can_send_packet_now, as shown in Listing [below](#lst:SingleOutputBufferTryToSend). L2CAP, BNEP, and ATT API offer similar functions.
full and RFCOMM_NO_OUTGOING_CREDITS, if no outgoing credits are
available. In Listing [below](#lst:SingleOutputBufferTryToSend), we show how to
resend data packets when credits or outgoing buffers become available.
~~~~ {#lst:SingleOutputBufferTryToSend .c caption="{Preparing and sending data.}"} ~~~~ {#lst:SingleOutputBufferTryToSend .c caption="{Preparing and sending data.}"}
void prepareData(void){ void prepareData(void){
@ -476,20 +473,15 @@ resend data packets when credits or outgoing buffers become available.
void tryToSend(void){ void tryToSend(void){
if (!dataLen) return; if (!dataLen) return;
if (!rfcomm_channel_id) return; if (!rfcomm_channel_id) return;
if (!rfcomm_can_send_packet_now(rfcomm_channel_id)) return;
int err = rfcomm_send_internal(rfcomm_channel_id, dataBuffer, dataLen); int err = rfcomm_send_internal(rfcomm_channel_id, dataBuffer, dataLen);
switch (err){ if (err) {
case 0: log_error("rfcomm_send_internal -> error 0X%02x", err);
// packet is sent prepare next one return;
prepareData();
break;
case RFCOMM_NO_OUTGOING_CREDITS:
case BTSTACK_ACL_BUFFERS_FULL:
break;
default:
printf("rfcomm_send_internal() -> err %d\n\r", err);
break;
} }
// packet is sent prepare next one
prepareData();
} }
~~~~ ~~~~