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This commit is contained in:
skarg
2007-11-29 15:56:53 +00:00
parent c585241c03
commit 411d6c1b24
236 changed files with 17864 additions and 15724 deletions
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bacnet-stack/ports/linux/rs485.c
+54 -42
View File
@@ -76,7 +76,8 @@ static struct termios RS485_oldtio;
* ALGORITHM: none
* NOTES: none
*********************************************************************/
void RS485_Set_Interface(char *ifname)
void RS485_Set_Interface(
char *ifname)
{
/* note: expects a constant char, or char from the heap */
RS485_Port_Name = ifname;
@@ -88,15 +89,21 @@ void RS485_Set_Interface(char *ifname)
* ALGORITHM: none
* NOTES: none
*****************************************************************************/
uint32_t RS485_Get_Baud_Rate(void)
uint32_t RS485_Get_Baud_Rate(
void)
{
switch (RS485_Baud) {
case B19200: return 19200;
case B38400: return 38400;
case B57600: return 57600;
case B115200: return 115200;
case B19200:
return 19200;
case B38400:
return 38400;
case B57600:
return 57600;
case B115200:
return 115200;
default:
case B9600: return 9600;
case B9600:
return 9600;
}
}
@@ -106,7 +113,8 @@ uint32_t RS485_Get_Baud_Rate(void)
* ALGORITHM: none
* NOTES: none
*****************************************************************************/
bool RS485_Set_Baud_Rate(uint32_t baud)
bool RS485_Set_Baud_Rate(
uint32_t baud)
{
bool valid = true;
@@ -140,10 +148,10 @@ bool RS485_Set_Baud_Rate(uint32_t baud)
/* Transmits a Frame on the wire */
void RS485_Send_Frame(
struct mstp_port_struct_t *mstp_port, /* port specific data */
uint8_t * buffer, /* frame to send (up to 501 bytes of data) */
uint16_t nbytes) /* number of bytes of data (up to 501) */
{
struct mstp_port_struct_t *mstp_port, /* port specific data */
uint8_t * buffer, /* frame to send (up to 501 bytes of data) */
uint16_t nbytes)
{ /* number of bytes of data (up to 501) */
uint8_t turnaround_time;
uint32_t baud;
ssize_t written = 0;
@@ -163,12 +171,12 @@ void RS485_Send_Frame(
};
}
/*
On success, the number of bytes written are returned (zero indicates
nothing was written). On error, -1 is returned, and errno is set
appropriately. If count is zero and the file descriptor refers to a
regular file, 0 will be returned without causing any other effect. For
a special file, the results are not portable.
*/
On success, the number of bytes written are returned (zero indicates
nothing was written). On error, -1 is returned, and errno is set
appropriately. If count is zero and the file descriptor refers to a
regular file, 0 will be returned without causing any other effect. For
a special file, the results are not portable.
*/
written = write(RS485_Handle, buffer, nbytes);
/* per MSTP spec, sort of */
@@ -180,18 +188,19 @@ void RS485_Send_Frame(
}
/* called by timer, interrupt(?) or other thread */
void RS485_Check_UART_Data(struct mstp_port_struct_t *mstp_port)
void RS485_Check_UART_Data(
struct mstp_port_struct_t *mstp_port)
{
uint8_t buf[1];
int count;
if (mstp_port->ReceiveError == true) {
/* wait for state machine to clear this */
}
/* wait for state machine to read from the DataRegister */
else if (mstp_port->DataAvailable == false) {
/* check for data */
count = read(RS485_Handle,buf,sizeof(buf));
count = read(RS485_Handle, buf, sizeof(buf));
/* if error, */
/* ReceiveError = TRUE; */
/* return; */
@@ -203,23 +212,24 @@ void RS485_Check_UART_Data(struct mstp_port_struct_t *mstp_port)
}
}
void RS485_Cleanup(void)
void RS485_Cleanup(
void)
{
/* restore the old port settings */
tcsetattr(RS485_Handle,TCSANOW,&RS485_oldtio);
tcsetattr(RS485_Handle, TCSANOW, &RS485_oldtio);
close(RS485_Handle);
}
void RS485_Initialize(void)
void RS485_Initialize(
void)
{
struct termios newtio;
/*
Open device for reading and writing.
*/
RS485_Handle = open(RS485_Port_Name,
O_RDWR | O_NOCTTY | O_NDELAY );
Open device for reading and writing.
*/
RS485_Handle = open(RS485_Port_Name, O_RDWR | O_NOCTTY | O_NDELAY);
if (RS485_Handle < 0) {
perror(RS485_Port_Name);
exit(-1);
@@ -232,17 +242,17 @@ void RS485_Initialize(void)
fcntl(RS485_Handle, F_SETFL, 0);
#endif
/* save current serial port settings */
tcgetattr(RS485_Handle,&RS485_oldtio);
tcgetattr(RS485_Handle, &RS485_oldtio);
/* clear struct for new port settings */
bzero(&newtio, sizeof(newtio));
/*
BAUDRATE: Set bps rate. You could also use cfsetispeed and cfsetospeed.
CRTSCTS : output hardware flow control (only used if the cable has
all necessary lines. See sect. 7 of Serial-HOWTO)
CS8 : 8n1 (8bit,no parity,1 stopbit)
CLOCAL : local connection, no modem contol
CREAD : enable receiving characters
*/
BAUDRATE: Set bps rate. You could also use cfsetispeed and cfsetospeed.
CRTSCTS : output hardware flow control (only used if the cable has
all necessary lines. See sect. 7 of Serial-HOWTO)
CS8 : 8n1 (8bit,no parity,1 stopbit)
CLOCAL : local connection, no modem contol
CREAD : enable receiving characters
*/
newtio.c_cflag = RS485_Baud | CS8 | CLOCAL | CREAD;
/* Raw input */
newtio.c_iflag = 0;
@@ -251,18 +261,20 @@ void RS485_Initialize(void)
/* no processing */
newtio.c_lflag = 0;
/* activate the settings for the port after flushing I/O */
tcsetattr(RS485_Handle,TCSAFLUSH,&newtio);
tcsetattr(RS485_Handle, TCSAFLUSH, &newtio);
/* destructor */
atexit(RS485_Cleanup);
}
#ifdef TEST_RS485
#include <string.h>
int main(int argc, char *argv[])
int main(
int argc,
char *argv[])
{
uint8_t buf[8];
char *wbuf = {"BACnet!"};
size_t wlen = strlen(wbuf)+1;
char *wbuf = { "BACnet!" };
size_t wlen = strlen(wbuf) + 1;
unsigned i = 0;
size_t written = 0;
int rlen;
@@ -276,11 +288,11 @@ int main(int argc, char *argv[])
for (;;) {
written = write(RS485_Handle, wbuf, wlen);
rlen = read(RS485_Handle,buf,sizeof(buf));
rlen = read(RS485_Handle, buf, sizeof(buf));
/* print any characters received */
if (rlen > 0) {
for (i = 0; i < rlen; i++) {
fprintf(stderr,"%02X ",buf[i]);
fprintf(stderr, "%02X ", buf[i]);
}
}
}