/** Open a serial connection and applies settings to the connection.
@param deviceFile The serial device to open (often /dev/ttyUSB0 or /dev/ttyACM0)
@param speed The baud rate to be applied to the connection.
@param parity 0=no parity; 1=odd parity; 2=even parity
@param vmin 0 = nonblocking; if >1, block until we have received at least vmin bytes
@param vtime If blocking, tenths of a second we should block until we give up.
@return The file descriptor for the serial connection.
*/
int serial_open(const char *deviceFile, int speed, int parity, int vmin, int vtime)
{
msg(DEBUG, "Opening serial connection to %s at %d baud\n", deviceFile, speed);
int fd = 0;
for(int i=0; i<10; i++)
{
if(i > 0 && fd == -1)
{
msg(ERROR, "Could not open serial connection to '%s', retrying...\n", deviceFile);
sleep(1); // Give user time to plug in cable.
}
#ifndef __MINGW32__
fd = open(deviceFile, O_RDWR | O_NOCTTY);
#else
fd = open(deviceFile, O_RDWR);
#endif
}
if(fd == -1)
{
msg(ERROR, "Failed to connect to '%s', giving up.\n", deviceFile);
exit(EXIT_FAILURE);
}
if(!isatty(fd))
{
msg(FATAL, "'%s' is not a tty.\n");
exit(EXIT_FAILURE);
}
#ifndef __MINGW32__
serial_settings(fd, speed, parity, vmin, vtime);
#endif
msg(DEBUG, "Serial connection to '%s' is open on fd=%d.\n", deviceFile, fd);
return fd;
}
static void transmit_task(rtems_task_argument arg)
{
rtems_status_code sc = RTEMS_SUCCESSFUL;
uart_bridge_master_control *control = (uart_bridge_master_control *) arg;
rtems_chain_control *fifo = &control->transmit_fifo;
int fd = open(control->device_path, O_WRONLY);
assert(fd >= 0);
serial_settings(fd);
while (true) {
intercom_packet *packet = NULL;
sc = rtems_chain_get_with_wait(
fifo,
TRANSMIT_EVENT,
RTEMS_NO_TIMEOUT,
(rtems_chain_node **) &packet
);
assert(sc == RTEMS_SUCCESSFUL);
write(fd, packet->data, packet->size);
qoriq_intercom_free_packet(packet);
}
}
static void receive_task(rtems_task_argument arg)
{
uart_bridge_master_control *control = (uart_bridge_master_control *) arg;
intercom_type type = control->type;
int fd = open(control->device_path, O_RDONLY);
assert(fd >= 0);
serial_settings(fd);
while (true) {
intercom_packet *packet = qoriq_intercom_allocate_packet(
type,
INTERCOM_SIZE_64
);
ssize_t in = read(fd, packet->data, packet->size - 1);
if (in > 0) {
packet->size = (size_t) in;
qoriq_intercom_send_packet(QORIQ_UART_BRIDGE_SLAVE_CORE, packet);
} else {
qoriq_intercom_free_packet(packet);
}
}
}
