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Added usleep for Tturnaround time before RS485 Transmit. Added tcdrain to wait for write to have written before returning. Thank you, Nikola Jelic!

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skarg
2012-01-21 01:46:46 +00:00
parent 52ea59f446
commit 0f0c41d347
1 changed files with 9 additions and 0 deletions
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bacnet-stack/ports/linux/rs485.c
+9
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@@ -287,8 +287,14 @@ void RS485_Send_Frame(
uint8_t * buffer, /* frame to send (up to 501 bytes of data) */ uint8_t * buffer, /* frame to send (up to 501 bytes of data) */
uint16_t nbytes) uint16_t nbytes)
{ /* number of bytes of data (up to 501) */ { /* number of bytes of data (up to 501) */
uint32_t turnaround_time = Tturnaround * 1000;
uint32_t baud = RS485_Get_Baud_Rate ();
ssize_t written = 0; ssize_t written = 0;
int greska; int greska;
/* sleeping for turnaround time is necessary to give other devices
time to change from sending to receiving state. */
usleep(turnaround_time/baud);
/* /*
On success, the number of bytes written are returned (zero indicates On success, the number of bytes written are returned (zero indicates
nothing was written). On error, -1 is returned, and errno is set nothing was written). On error, -1 is returned, and errno is set
@@ -300,6 +306,9 @@ void RS485_Send_Frame(
greska = errno; greska = errno;
if (written <= 0) { if (written <= 0) {
printf("write error: %s\n", strerror(greska)); printf("write error: %s\n", strerror(greska));
} else {
/* wait until all output has been transmitted. */
tcdrain(RS485_Handle);
} }
/* tcdrain(RS485_Handle); */ /* tcdrain(RS485_Handle); */
/* per MSTP spec, sort of */ /* per MSTP spec, sort of */