ardupilot/libraries/GCS_MAVLink/GCS_serial_control.cpp

176 lines
5.1 KiB
C++

/*
MAVLink SERIAL_CONTROL handling
*/
/*
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <AP_HAL/AP_HAL.h>
#include "GCS.h"
#include <AP_Logger/AP_Logger.h>
extern const AP_HAL::HAL& hal;
/**
handle a SERIAL_CONTROL message
*/
void GCS_MAVLINK::handle_serial_control(const mavlink_message_t *msg)
{
mavlink_serial_control_t packet;
mavlink_msg_serial_control_decode(msg, &packet);
AP_HAL::UARTDriver *port = nullptr;
AP_HAL::BetterStream *stream = nullptr;
if (packet.flags & SERIAL_CONTROL_FLAG_REPLY) {
// how did this packet get to us?
return;
}
bool exclusive = (packet.flags & SERIAL_CONTROL_FLAG_EXCLUSIVE) != 0;
switch (packet.device) {
case SERIAL_CONTROL_DEV_TELEM1:
stream = port = hal.uartC;
lock_channel(MAVLINK_COMM_1, exclusive);
break;
case SERIAL_CONTROL_DEV_TELEM2:
stream = port = hal.uartD;
lock_channel(MAVLINK_COMM_2, exclusive);
break;
case SERIAL_CONTROL_DEV_GPS1:
stream = port = hal.uartB;
AP::gps().lock_port(0, exclusive);
break;
case SERIAL_CONTROL_DEV_GPS2:
stream = port = hal.uartE;
AP::gps().lock_port(1, exclusive);
break;
case SERIAL_CONTROL_DEV_SHELL:
stream = hal.util->get_shell_stream();
if (stream == nullptr) {
return;
}
break;
default:
// not supported yet
return;
}
if (stream == nullptr) {
// this is probably very bad
#if CONFIG_HAL_BOARD == HAL_BOARD_SITL
AP_HAL::panic("stream is nullptr");
#endif
return;
}
if (exclusive && port != nullptr) {
// force flow control off for exclusive access. This protocol
// is used to talk to bootloaders which may not have flow
// control support
port->set_flow_control(AP_HAL::UARTDriver::FLOW_CONTROL_DISABLE);
}
// optionally change the baudrate
if (packet.baudrate != 0 && port != nullptr) {
port->begin(packet.baudrate);
}
// write the data
if (packet.count != 0) {
if ((packet.flags & SERIAL_CONTROL_FLAG_BLOCKING) == 0) {
stream->write(packet.data, packet.count);
} else {
const uint8_t *data = &packet.data[0];
uint8_t count = packet.count;
while (count > 0) {
while (stream->txspace() <= 0) {
hal.scheduler->delay(5);
}
uint16_t n = stream->txspace();
if (n > packet.count) {
n = packet.count;
}
stream->write(data, n);
data += n;
count -= n;
}
}
}
if ((packet.flags & SERIAL_CONTROL_FLAG_RESPOND) == 0) {
// no response expected
return;
}
uint8_t flags = packet.flags;
more_data:
// sleep for the timeout
while (packet.timeout != 0 &&
stream->available() < (int16_t)sizeof(packet.data)) {
hal.scheduler->delay(1);
packet.timeout--;
}
packet.flags = SERIAL_CONTROL_FLAG_REPLY;
// work out how many bytes are available
int16_t available = stream->available();
if (available < 0) {
available = 0;
}
if (available > (int16_t)sizeof(packet.data)) {
available = sizeof(packet.data);
}
if (available == 0 && (flags & SERIAL_CONTROL_FLAG_BLOCKING) == 0) {
return;
}
if (packet.flags & SERIAL_CONTROL_FLAG_BLOCKING) {
while (!HAVE_PAYLOAD_SPACE(chan, SERIAL_CONTROL)) {
hal.scheduler->delay(1);
}
} else {
if (!HAVE_PAYLOAD_SPACE(chan, SERIAL_CONTROL)) {
// no space for reply
return;
}
}
// read any reply data
packet.count = 0;
memset(packet.data, 0, sizeof(packet.data));
while (available > 0) {
packet.data[packet.count++] = (uint8_t)stream->read();
available--;
}
// and send the reply
_mav_finalize_message_chan_send(chan,
MAVLINK_MSG_ID_SERIAL_CONTROL,
(const char *)&packet,
MAVLINK_MSG_ID_SERIAL_CONTROL_MIN_LEN,
MAVLINK_MSG_ID_SERIAL_CONTROL_LEN,
MAVLINK_MSG_ID_SERIAL_CONTROL_CRC);
if ((flags & SERIAL_CONTROL_FLAG_MULTI) && packet.count != 0) {
if (flags & SERIAL_CONTROL_FLAG_BLOCKING) {
hal.scheduler->delay(1);
}
goto more_data;
}
}