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ardupilot/libraries/SITL/SIM_JSON.cpp

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/*
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/>.
*/
/*
Simulator Connector for JSON based interfaces
*/
#include "SIM_JSON.h"
#include <stdio.h>
#include <arpa/inet.h>
#include <errno.h>
#include <AP_HAL/AP_HAL.h>
#include <AP_Logger/AP_Logger.h>
#include <AP_HAL/utility/replace.h>
#define UDP_TIMEOUT_MS 100
extern const AP_HAL::HAL& hal;
using namespace SITL;
static const struct {
const char *name;
float value;
bool save;
} sim_defaults[] = {
{ "BRD_OPTIONS", 0},
{ "INS_GYR_CAL", 0 },
{ "INS_ACC2OFFS_X", 0.001 },
{ "INS_ACC2OFFS_Y", 0.001 },
{ "INS_ACC2OFFS_Z", 0.001 },
{ "INS_ACC2SCAL_X", 1.001 },
{ "INS_ACC2SCAL_Y", 1.001 },
{ "INS_ACC2SCAL_Z", 1.001 },
{ "INS_ACCOFFS_X", 0.001 },
{ "INS_ACCOFFS_Y", 0.001 },
{ "INS_ACCOFFS_Z", 0.001 },
{ "INS_ACCSCAL_X", 1.001 },
{ "INS_ACCSCAL_Y", 1.001 },
{ "INS_ACCSCAL_Z", 1.001 },
};
JSON::JSON(const char *frame_str) :
Aircraft(frame_str),
sock(true)
{
printf("Starting SITL: JSON\n");
const char *colon = strchr(frame_str, ':');
if (colon) {
target_ip = colon+1;
}
for (uint8_t i=0; i<ARRAY_SIZE(sim_defaults); i++) {
AP_Param::set_default_by_name(sim_defaults[i].name, sim_defaults[i].value);
if (sim_defaults[i].save) {
enum ap_var_type ptype;
AP_Param *p = AP_Param::find(sim_defaults[i].name, &ptype);
if (!p->configured()) {
p->save();
}
}
}
}
/*
Create & set in/out socket
*/
void JSON::set_interface_ports(const char* address, const int port_in, const int port_out)
{
sock.set_blocking(false);
sock.reuseaddress();
if (strcmp("127.0.0.1",address) != 0) {
target_ip = address;
}
control_port = port_out;
printf("JSON control interface set to %s:%u\n", target_ip, control_port);
}
/*
Decode and send servos
*/
void JSON::output_servos(const struct sitl_input &input)
{
servo_packet pkt;
pkt.frame_rate = rate_hz;
pkt.frame_count = frame_counter;
for (uint8_t i=0; i<16; i++) {
pkt.pwm[i] = input.servos[i];
}
size_t send_ret = sock.sendto(&pkt, sizeof(pkt), target_ip, control_port);
if (send_ret != sizeof(pkt)) {
if (send_ret <= 0) {
printf("Unable to send servo output to %s:%u - Error: %s, Return value: %ld\n",
target_ip, control_port, strerror(errno), (long)send_ret);
} else {
printf("Sent %ld bytes instead of %lu bytes\n", (long)send_ret, (unsigned long)sizeof(pkt));
}
}
}
/*
very simple JSON parser for sensor data
called with pointer to one row of sensor data, nul terminated
This parser does not do any syntax checking, and is not at all
general purpose
*/
bool JSON::parse_sensors(const char *json)
{
//printf("%s\n", json);
for (uint16_t i=0; i<ARRAY_SIZE(keytable); i++) {
struct keytable &key = keytable[i];
/* look for section header */
const char *p = strstr(json, key.section);
if (!p) {
// we don't have this sensor
printf("Failed to find %s\n", key.section);
continue;
}
p += strlen(key.section)+1;
// find key inside section
p = strstr(p, key.key);
if (!p) {
printf("Failed to find key %s/%s\n", key.section, key.key);
return false;
}
p += strlen(key.key)+2;
switch (key.type) {
case DATA_UINT64:
*((uint64_t *)key.ptr) = strtoull(p, nullptr, 10);
//printf("%s/%s = %lu\n", key.section, key.key, *((uint64_t *)key.ptr));
break;
case DATA_FLOAT:
*((float *)key.ptr) = atof(p);
//printf("%s/%s = %f\n", key.section, key.key, *((float *)key.ptr));
break;
case DATA_DOUBLE:
*((double *)key.ptr) = atof(p);
//printf("%s/%s = %f\n", key.section, key.key, *((double *)key.ptr));
break;
case DATA_VECTOR3F: {
Vector3f *v = (Vector3f *)key.ptr;
if (sscanf(p, "[%f, %f, %f]", &v->x, &v->y, &v->z) != 3) {
printf("Failed to parse Vector3f for %s/%s\n", key.section, key.key);
return false;
}
//printf("%s/%s = %f, %f, %f\n", key.section, key.key, v->x, v->y, v->z);
break;
}
}
}
return true;
}
/*
Receive new sensor data from simulator
This is a blocking function
*/
void JSON::recv_fdm(const struct sitl_input &input)
{
// Receive sensor packet
ssize_t ret = sock.recv(&sensor_buffer[sensor_buffer_len], sizeof(sensor_buffer)-sensor_buffer_len, UDP_TIMEOUT_MS);
uint32_t wait_ms = UDP_TIMEOUT_MS;
while (ret <= 0) {
//printf("No JSON sensor message received - %s\n", strerror(errno));
ret = sock.recv(&sensor_buffer[sensor_buffer_len], sizeof(sensor_buffer)-sensor_buffer_len, UDP_TIMEOUT_MS);
wait_ms += UDP_TIMEOUT_MS;
// if no sensor message is received after 10 second resend servos, this help cope with SITL and the physics getting out of sync
if (wait_ms > 1000) {
wait_ms = 0;
printf("No JSON sensor message received, resending servos\n");
output_servos(input);
}
}
// convert '\n' into nul
while (uint8_t *p = (uint8_t *)memchr(&sensor_buffer[sensor_buffer_len], '\n', ret)) {
*p = 0;
}
sensor_buffer_len += ret;
const uint8_t *p2 = (const uint8_t *)memrchr(sensor_buffer, 0, sensor_buffer_len);
if (p2 == nullptr || p2 == sensor_buffer) {
return;
}
const uint8_t *p1 = (const uint8_t *)memrchr(sensor_buffer, 0, p2 - sensor_buffer);
if (p1 == nullptr) {
return;
}
parse_sensors((const char *)(p1+1));
memmove(sensor_buffer, p2, sensor_buffer_len - (p2 - sensor_buffer));
sensor_buffer_len = sensor_buffer_len - (p2 - sensor_buffer);
accel_body = Vector3f(state.imu.accel_body[0],
state.imu.accel_body[1],
state.imu.accel_body[2]);
gyro = Vector3f(state.imu.gyro[0],
state.imu.gyro[1],
state.imu.gyro[2]);
velocity_ef = Vector3f(state.velocity[0],
state.velocity[1],
state.velocity[2]);
// velocity relative to airmass in body frame
velocity_air_bf = dcm.transposed() * velocity_ef;
// airspeed
airspeed = velocity_air_bf.length();
// airspeed as seen by a fwd pitot tube (limited to 120m/s)
airspeed_pitot = constrain_float(velocity_air_bf * Vector3f(1.0f, 0.0f, 0.0f), 0.0f, 120.0f);
position = Vector3f(state.position[0],
state.position[1],
state.position[2]);
dcm.from_euler(state.attitude[0], state.attitude[1], state.attitude[2]);
// Convert from a meters from origin physics to a lat long alt
update_position();
double deltat;
if (state.timestamp_s < last_timestamp_s) {
// Physics time has gone backwards, don't reset AP, assume an average size timestep
printf("Detected physics reset\n");
deltat = 0;
} else {
deltat = state.timestamp_s - last_timestamp_s;
}
time_now_us += deltat * 1.0e6;
if (is_positive(deltat) && deltat < 0.1) {
// time in us to hz
adjust_frame_time(1.0 / deltat);
// match actual frame rate with desired speedup
time_advance();
}
last_timestamp_s = state.timestamp_s;
frame_counter++;
#if 0
// @LoggerMessage: JSN1
// @Description: Log data received from JSON simulator
// @Field: TimeUS: Time since system startup (us)
// @Field: TStamp: Simulation's timestamp (s)
// @Field: R: Simulation's roll (rad)
// @Field: P: Simulation's pitch (rad)
// @Field: Y: Simulation's yaw (rad)
// @Field: GX: Simulated gyroscope, X-axis (rad/sec)
// @Field: GY: Simulated gyroscope, Y-axis (rad/sec)
// @Field: GZ: Simulated gyroscope, Z-axis (rad/sec)
AP::logger().Write("JSN1", "TimeUS,TStamp,R,P,Y,GX,GY,GZ",
"ssrrrEEE",
"F???????",
"Qfffffff",
AP_HAL::micros64(),
state.timestamp_s,
state.attitude[0],
state.attitude[1],
state.attitude[2],
gyro.x,
gyro.y,
gyro.z);
Vector3f accel_ef = dcm.transposed() * accel_body;
// @LoggerMessage: JSN2
// @Description: Log data received from JSON simulator
// @Field: TimeUS: Time since system startup (us)
// @Field: VN: simulation's velocity, North-axis (m/s)
// @Field: VE: simulation's velocity, East-axis (m/s)
// @Field: VD: simulation's velocity, Down-axis (m/s)
// @Field: AX: simulation's acceleration, X-axis (m/s^2)
// @Field: AY: simulation's acceleration, Y-axis (m/s^2)
// @Field: AZ: simulation's acceleration, Z-axis (m/s^2)
// @Field: AN: simulation's acceleration, North (m/s^2)
// @Field: AE: simulation's acceleration, East (m/s^2)
// @Field: AD: simulation's acceleration, Down (m/s^2)
AP::logger().Write("JSN2", "TimeUS,VN,VE,VD,AX,AY,AZ,AN,AE,AD",
"snnnoooooo",
"F?????????",
"Qfffffffff",
AP_HAL::micros64(),
velocity_ef.x,
velocity_ef.y,
velocity_ef.z,
accel_body.x,
accel_body.y,
accel_body.z,
accel_ef.x,
accel_ef.y,
accel_ef.z);
#endif
}
/*
update the JSON simulation by one time step
*/
void JSON::update(const struct sitl_input &input)
{
// send to JSON model
output_servos(input);
// receive from JSON model
recv_fdm(input);
// update magnetic field
// as the model does not provide mag feild we calculate it from position and attitude
update_mag_field_bf();
// allow for changes in physics step
adjust_frame_time(constrain_float(sitl->loop_rate_hz, rate_hz-1, rate_hz+1));
#if 0
// report frame rate
if (frame_counter % 1000 == 0) {
printf("FPS %.2f\n", achieved_rate_hz); // this is instantaneous rather than any clever average
}
#endif
}
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