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Create new RS485 test case

This commit is contained in:
Will Hedgecock 2022-01-17 21:56:40 -06:00
parent d54555f5e4
commit 07656bf95c
2 changed files with 95 additions and 0 deletions
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2
src/test/c/Makefile
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@ -35,6 +35,8 @@ $(BUILD_DIR) :
# Build rules for all tests
testOpenClose : $(BUILD_DIR)/testOpenClose.o $(BUILD_DIR)/PosixHelperFunctions.o
$(COMPILE) $(LDFLAGS) $(LIBRARIES) -o $@ $^
testRS485 : $(BUILD_DIR)/testRS485.o
$(COMPILE) $(LDFLAGS) $(LIBRARIES) -o $@ $^
testEnumeratePosix : $(BUILD_DIR)/testEnumeratePosix.o $(BUILD_DIR)/PosixHelperFunctions.o
$(COMPILE) $(LDFLAGS) $(LIBRARIES) -o $@ $^
testEnumerateWindows : $(BUILD_DIR)/testEnumerateWindows.o $(BUILD_DIR)/WindowsHelperFunctions.o

93
src/test/c/testRS485.c Normal file
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@ -0,0 +1,93 @@
#include <stdio.h>
#include <stdlib.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#include <termios.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <linux/serial.h>
#define termios asmtermios
#define termio asmtermio
#define winsize asmwinsize
#include <asm/ioctls.h>
#include <asm/termios.h>
#undef termio
#undef termios
#undef winsize
int main(int argc, char *argv[])
{
// Ensure that port handle was passed in
if (argc != 2)
{
printf("Usage: ./testRS485 /dev/port/path\n");
return 0;
}
const char *portName = argv[1];
// Open serial port
int portHandle = open(portName, O_RDWR | O_NOCTTY | O_NONBLOCK | O_CLOEXEC);
if (portHandle > 0)
{
// Ensure that multiple root users cannot access the device simultaneously
if (flock(portHandle, LOCK_EX | LOCK_NB))
{
while (close(portHandle) && (errno == EINTR))
errno = 0;
portHandle = -1;
}
}
if (portHandle <= 0)
{
printf("Error opening port at %s\n", portName);
return -1;
}
// Attempt to retrieve RS485 configuration from connected device
struct serial_rs485 rs485Conf = { 0 };
int retVal = ioctl(portHandle, TIOCGRS485, &rs485Conf);
if (retVal)
{
printf("Error retrieving RS485 configuration, Code = %d, Errno = %d\n", retVal, errno);
return -2;
}
// Attempt to enable RS485 configuration
rs485Conf.flags |= SER_RS485_ENABLED;
rs485Conf.flags |= SER_RS485_RTS_ON_SEND;
rs485Conf.flags &= ~(SER_RS485_RTS_AFTER_SEND);
rs485Conf.flags &= ~(SER_RS485_RX_DURING_TX);
rs485Conf.flags &= ~(SER_RS485_TERMINATE_BUS);
rs485Conf.delay_rts_before_send = 1;
rs485Conf.delay_rts_after_send = 1;
retVal = ioctl(portHandle, TIOCSRS485, &rs485Conf);
if (retVal)
{
printf("Error enabling RS485 configuration, Code = %d, Errno = %d\n", retVal, errno);
return -3;
}
// Attempt to disable RS485 configuration
rs485Conf.flags &= ~SER_RS485_ENABLED;
rs485Conf.flags &= ~(SER_RS485_RTS_ON_SEND);
rs485Conf.flags |= SER_RS485_RTS_AFTER_SEND;
rs485Conf.flags |= SER_RS485_RX_DURING_TX;
rs485Conf.flags |= SER_RS485_TERMINATE_BUS;
retVal = ioctl(portHandle, TIOCSRS485, &rs485Conf);
if (retVal)
{
printf("Error disabling RS485 configuration, Code = %d, Errno = %d\n", retVal, errno);
return -4;
}
// Unblock, unlock, and close the port
fsync(portHandle);
tcdrain(portHandle);
tcflush(portHandle, TCIOFLUSH);
flock(portHandle, LOCK_UN | LOCK_NB);
while (close(portHandle) && (errno == EINTR))
errno = 0;
portHandle = -1;
return 0;
}