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Add new flag (-r) to support inverted RTS flow control\n\nThis is useful if you have a MAX485 connected to a Raspberry PI where you pull want RST low to transmit (#98)

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Cían Hughes 2023-11-27 12:14:38 +00:00 committed by GitHub
parent b07681842f
commit 4ee7e8a834
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GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 24 additions and 9 deletions
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6
src/cfg.c
View File

@ -202,7 +202,11 @@ cfg_handle_param(char *name, char *value)
}
else if (CFG_VALUE_MATCH("rts"))
{
cfg.trxcntl = TRX_RTS;
cfg.trxcntl = TRX_RTS_1;
}
else if (CFG_VALUE_MATCH("rts_0"))
{
cfg.trxcntl = TRX_RTS_0;
}
else if (CFG_VALUE_MATCH("sysfs_0"))
{

8
src/main.c
View File

@ -139,7 +139,8 @@ usage(char *exename)
" -A address : set TCP server address to bind (default %s)\n"
" -P port : set TCP server port number (default %d)\n"
#ifdef TRXCTL
" -t : enable RTS RS-485 data direction control using RTS\n"
" -t : enable RTS RS-485 data direction control using RTS, active transmit\n"
" -r : enable RTS RS-485 data direction control using RTS, active receive\n"
" -y : enable RTS RS-485 data direction control using sysfs file, active transmit\n"
" -Y : enable RTS RS-485 data direction control using sysfs file, active receive\n"
#endif
@ -218,7 +219,10 @@ main(int argc, char *argv[])
break;
#ifdef TRXCTL
case 't':
cfg.trxcntl = TRX_RTS;
cfg.trxcntl = TRX_RTS_1;
break;
case 'r':
cfg.trxcntl = TRX_RTS_0;
break;
case 'y':
cfg.trxcntl = TRX_SYSFS_1;

10
src/tty.c
View File

@ -469,9 +469,12 @@ void sysfs_gpio_set(char *filename, char *value) {
void
tty_set_rts(int fd)
{
if ( TRX_RTS == cfg.trxcntl ) {
if ( TRX_RTS_1 == cfg.trxcntl ) {
int mstat = TIOCM_RTS;
ioctl(fd, TIOCMBIS, &mstat);
} else if ( TRX_RTS_0 == cfg.trxcntl ) {
int mstat = TIOCM_RTS;
ioctl(fd, TIOCMBIC, &mstat);
} else if ( TRX_SYSFS_1 == cfg.trxcntl) {
sysfs_gpio_set(cfg.trxcntl_file,"1");
} else if ( TRX_SYSFS_0 == cfg.trxcntl) {
@ -483,9 +486,12 @@ tty_set_rts(int fd)
void
tty_clr_rts(int fd)
{
if ( TRX_RTS == cfg.trxcntl ) {
if ( TRX_RTS_1 == cfg.trxcntl ) {
int mstat = TIOCM_RTS;
ioctl(fd, TIOCMBIC, &mstat);
} else if ( TRX_RTS_0 == cfg.trxcntl ) {
int mstat = TIOCM_RTS;
ioctl(fd, TIOCMBIS, &mstat);
} else if ( TRX_SYSFS_1 == cfg.trxcntl) {
sysfs_gpio_set(cfg.trxcntl_file,"0");
} else if ( TRX_SYSFS_0 == cfg.trxcntl) {

7
src/tty.h
View File

@ -77,9 +77,10 @@
*/
#ifdef TRXCTL
#define TRX_ADDC 0
#define TRX_RTS 1
#define TRX_SYSFS_1 2
#define TRX_SYSFS_0 3
#define TRX_RTS_1 1
#define TRX_RTS_0 2
#define TRX_SYSFS_1 3
#define TRX_SYSFS_0 4
#endif
/*