ardupilot/APMrover2/commands.pde

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// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*-
/* Functions in this file:
void init_commands()
struct Location get_cmd_with_index(int i)
void set_cmd_with_index(struct Location temp, int i)
void increment_cmd_index()
void decrement_cmd_index()
long read_alt_to_hold()
void set_next_WP(struct Location *wp)
void set_guided_WP(void)
void init_home()
void restart_nav()
************************************************************
*/
static void init_commands()
{
g.command_index.set_and_save(0);
nav_command_ID = NO_COMMAND;
non_nav_command_ID = NO_COMMAND;
next_nav_command.id = CMD_BLANK;
}
// Getters
// -------
static struct Location get_cmd_with_index(int i)
{
struct Location temp;
uint16_t mem;
// Find out proper location in memory by using the start_byte position + the index
// --------------------------------------------------------------------------------
if (i > g.command_total) {
memset(&temp, 0, sizeof(temp));
temp.id = CMD_BLANK;
}else{
// read WP position
mem = (WP_START_BYTE) + (i * WP_SIZE);
temp.id = hal.storage->read_byte(mem);
mem++;
temp.options = hal.storage->read_byte(mem);
mem++;
temp.p1 = hal.storage->read_byte(mem);
mem++;
temp.alt = (long)hal.storage->read_dword(mem);
mem += 4;
temp.lat = (long)hal.storage->read_dword(mem);
mem += 4;
temp.lng = (long)hal.storage->read_dword(mem);
}
// Add on home altitude if we are a nav command (or other command with altitude) and stored alt is relative
if((temp.id < MAV_CMD_NAV_LAST || temp.id == MAV_CMD_CONDITION_CHANGE_ALT) && temp.options & MASK_OPTIONS_RELATIVE_ALT){
temp.alt += home.alt;
}
return temp;
}
// Setters
// -------
static void set_cmd_with_index(struct Location temp, int i)
{
i = constrain_int16(i, 0, g.command_total.get());
uint16_t mem = WP_START_BYTE + (i * WP_SIZE);
// Set altitude options bitmask
// XXX What is this trying to do?
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if ((temp.options & MASK_OPTIONS_RELATIVE_ALT) && i != 0){
temp.options = MASK_OPTIONS_RELATIVE_ALT;
} else {
temp.options = 0;
}
hal.storage->write_byte(mem, temp.id);
mem++;
hal.storage->write_byte(mem, temp.options);
mem++;
hal.storage->write_byte(mem, temp.p1);
mem++;
hal.storage->write_dword(mem, temp.alt);
mem += 4;
hal.storage->write_dword(mem, temp.lat);
mem += 4;
hal.storage->write_dword(mem, temp.lng);
}
/*
This function stores waypoint commands
It looks to see what the next command type is and finds the last command.
*/
static void set_next_WP(const struct Location *wp)
{
// copy the current WP into the OldWP slot
// ---------------------------------------
prev_WP = next_WP;
// Load the next_WP slot
// ---------------------
next_WP = *wp;
// are we already past the waypoint? This happens when we jump
// waypoints, and it can cause us to skip a waypoint. If we are
// past the waypoint when we start on a leg, then use the current
// location as the previous waypoint, to prevent immediately
// considering the waypoint complete
if (location_passed_point(current_loc, prev_WP, next_WP)) {
gcs_send_text_P(SEVERITY_LOW, PSTR("Resetting prev_WP"));
prev_WP = current_loc;
}
// this is handy for the groundstation
wp_totalDistance = get_distance(&current_loc, &next_WP);
wp_distance = wp_totalDistance;
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target_bearing = get_bearing_cd(&current_loc, &next_WP);
nav_bearing = target_bearing;
// set a new crosstrack bearing
// ----------------------------
reset_crosstrack();
}
static void set_guided_WP(void)
{
// copy the current location into the OldWP slot
// ---------------------------------------
prev_WP = current_loc;
// Load the next_WP slot
// ---------------------
next_WP = guided_WP;
// this is handy for the groundstation
wp_totalDistance = get_distance(&current_loc, &next_WP);
wp_distance = wp_totalDistance;
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target_bearing = get_bearing_cd(&current_loc, &next_WP);
// set a new crosstrack bearing
// ----------------------------
reset_crosstrack();
}
// run this at setup on the ground
// -------------------------------
void init_home()
{
if (!have_position) {
// we need position information
return;
}
gcs_send_text_P(SEVERITY_LOW, PSTR("init home"));
home.id = MAV_CMD_NAV_WAYPOINT;
home.lng = g_gps->longitude; // Lon * 10**7
home.lat = g_gps->latitude; // Lat * 10**7
gps_base_alt = max(g_gps->altitude, 0);
home.alt = g_gps->altitude;
home_is_set = true;
// Save Home to EEPROM - Command 0
// -------------------
set_cmd_with_index(home, 0);
// Save prev loc
// -------------
next_WP = prev_WP = home;
// Load home for a default guided_WP
// -------------
guided_WP = home;
}
static void restart_nav()
{
g.pidNavSteer.reset_I();
g.pidSpeedThrottle.reset_I();
prev_WP = current_loc;
nav_command_ID = NO_COMMAND;
nav_command_index = 0;
process_next_command();
}