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Rover: added PIVOT_TURN_ANGLE parameter 

this allows skid steering rovers to turn on the spot for sharp turns
This commit is contained in:
Andrew Tridgell 2014-02-17 10:08:59 +11:00
parent bbf5c11c8a
commit 4e2d5043ba
3 changed files with 37 additions and 0 deletions
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2
APMrover2/Parameters.h
View File

@ -35,6 +35,7 @@ public:
k_param_scheduler,
k_param_relay,
k_param_BoardConfig,
k_param_pivot_turn_angle,
// IO pins
k_param_rssi_pin = 20,
@ -207,6 +208,7 @@ public:
AP_Int8 auto_trigger_pin;
AP_Float auto_kickstart;
AP_Float turn_max_g;
AP_Int16 pivot_turn_angle;
// RC channels
RC_Channel rc_1;

9
APMrover2/Parameters.pde
View File

@ -145,6 +145,15 @@ const AP_Param::Info var_info[] PROGMEM = {
// @User: Standard
GSCALAR(speed_turn_dist, "SPEED_TURN_DIST", 2.0f),
// @Param: PIVOT_TURN_ANGLE
// @DisplayName: Pivot turn angle
// @Description: Navigation angle threshold in degrees to switch to pivot steering when SKID_STEER_OUT is 1. This allows you to setup a skid steering rover to turn on the spot in auto mode when the angle it needs to turn it greater than this angle. An angle of zero means to disable pivot turning. Note that you will probably also want to set a low value for WP_RADIUS to get neat turns.
// @Units: degrees
// @Range: 0 360
// @Increment: 1
// @User: Standard
GSCALAR(pivot_turn_angle, "PIVOT_TURN_ANGLE", 30),
// @Param: CH7_OPTION
// @DisplayName: Channel 7 option
// @Description: What to do use channel 7 for

26
APMrover2/Steering.pde
View File

@ -64,6 +64,20 @@ static bool auto_check_trigger(void)
return false;
}
/*
work out if we are going to use pivot steering
*/
static bool use_pivot_steering(void)
{
if (g.skid_steer_out && g.pivot_turn_angle != 0) {
int16_t bearing_error = wrap_180_cd(nav_controller->target_bearing_cd() - ahrs.yaw_sensor) / 100;
if (abs(bearing_error) > g.pivot_turn_angle) {
return true;
}
}
return false;
}
/*
calculate the throtte for auto-throttle modes
@ -110,6 +124,10 @@ static void calc_throttle(float target_speed)
} else {
channel_throttle->servo_out = constrain_int16(throttle, g.throttle_min, g.throttle_max);
}
if (use_pivot_steering()) {
channel_throttle->servo_out = 0;
}
}
/*****************************************
@ -137,6 +155,14 @@ static void calc_lateral_acceleration()
// negative error = left turn
// positive error = right turn
lateral_acceleration = nav_controller->lateral_acceleration();
if (use_pivot_steering()) {
int16_t bearing_error = wrap_180_cd(nav_controller->target_bearing_cd() - ahrs.yaw_sensor) / 100;
if (bearing_error > 0) {
lateral_acceleration = g.turn_max_g*GRAVITY_MSS;
} else {
lateral_acceleration = -g.turn_max_g*GRAVITY_MSS;
}
}
}
/*