int
mixer_handle_text(const void *buffer, size_t length)
{
/* do not allow a mixer change while safety off and FMU armed */
if ((r_status_flags & PX4IO_P_STATUS_FLAGS_SAFETY_OFF) &&
(r_setup_arming & PX4IO_P_SETUP_ARMING_FMU_ARMED)) {
return 1;
}
/* disable mixing, will be enabled once load is complete */
PX4_ATOMIC_MODIFY_CLEAR(r_status_flags, PX4IO_P_STATUS_FLAGS_MIXER_OK);
/* abort if we're in the mixer - the caller is expected to retry */
if (in_mixer) {
return 1;
}
px4io_mixdata *msg = (px4io_mixdata *)buffer;
isr_debug(2, "mix txt %u", length);
if (length < sizeof(px4io_mixdata)) {
return 0;
}
unsigned text_length = length - sizeof(px4io_mixdata);
switch (msg->action) {
case F2I_MIXER_ACTION_RESET:
isr_debug(2, "reset");
/* THEN actually delete it */
mixer_group.reset();
mixer_text_length = 0;
/* FALLTHROUGH */
case F2I_MIXER_ACTION_APPEND:
isr_debug(2, "append %d", length);
/* check for overflow - this would be really fatal */
if ((mixer_text_length + text_length + 1) > sizeof(mixer_text)) {
PX4_ATOMIC_MODIFY_CLEAR(r_status_flags, PX4IO_P_STATUS_FLAGS_MIXER_OK);
return 0;
}
/* check if the last item has been processed - bail out if not */
if (mixer_update_pending) {
return 1;
}
/* append mixer text and nul-terminate, guard against overflow */
memcpy(&mixer_text[mixer_text_length], msg->text, text_length);
mixer_text_length += text_length;
mixer_text[mixer_text_length] = '\0';
isr_debug(2, "buflen %u", mixer_text_length);
/* flag the buffer as ready */
mixer_update_pending = true;
break;
}
return 0;
}
static void
safety_check_button(void *arg)
{
/*
* Debounce the safety button, change state if it has been held for long enough.
*
*/
safety_button_pressed = BUTTON_SAFETY;
/*
* Keep pressed for a while to arm.
*
* Note that the counting sequence has to be same length
* for arming / disarming in order to end up as proper
* state machine, keep ARM_COUNTER_THRESHOLD the same
* length in all cases of the if/else struct below.
*/
if (safety_button_pressed && !(r_status_flags & PX4IO_P_STATUS_FLAGS_SAFETY_OFF) &&
(r_setup_arming & PX4IO_P_SETUP_ARMING_IO_ARM_OK)) {
if (counter < ARM_COUNTER_THRESHOLD) {
counter++;
} else if (counter == ARM_COUNTER_THRESHOLD) {
/* switch to armed state */
PX4_ATOMIC_MODIFY_OR(r_status_flags, PX4IO_P_STATUS_FLAGS_SAFETY_OFF);
counter++;
}
} else if (safety_button_pressed && (r_status_flags & PX4IO_P_STATUS_FLAGS_SAFETY_OFF)) {
if (counter < ARM_COUNTER_THRESHOLD) {
counter++;
} else if (counter == ARM_COUNTER_THRESHOLD) {
/* change to disarmed state and notify the FMU */
PX4_ATOMIC_MODIFY_CLEAR(r_status_flags, PX4IO_P_STATUS_FLAGS_SAFETY_OFF);
counter++;
}
} else {
counter = 0;
}
/* Select the appropriate LED flash pattern depending on the current IO/FMU arm state */
uint16_t pattern = LED_PATTERN_FMU_REFUSE_TO_ARM;
if (r_status_flags & PX4IO_P_STATUS_FLAGS_SAFETY_OFF) {
if (r_setup_arming & PX4IO_P_SETUP_ARMING_FMU_ARMED) {
pattern = LED_PATTERN_IO_FMU_ARMED;
} else {
pattern = LED_PATTERN_IO_ARMED;
}
} else if (r_setup_arming & PX4IO_P_SETUP_ARMING_FMU_ARMED) {
pattern = LED_PATTERN_FMU_ARMED;
} else if (r_setup_arming & PX4IO_P_SETUP_ARMING_IO_ARM_OK) {
pattern = LED_PATTERN_FMU_OK_TO_ARM;
}
/* Turn the LED on if we have a 1 at the current bit position */
LED_SAFETY(pattern & (1 << blink_counter++));
if (blink_counter > 15) {
blink_counter = 0;
}
}
void
mixer_tick(void)
{
/* check if the mixer got modified */
mixer_handle_text_create_mixer();
/* check that we are receiving fresh data from the FMU */
if ((system_state.fmu_data_received_time == 0) ||
hrt_elapsed_time(&system_state.fmu_data_received_time) > FMU_INPUT_DROP_LIMIT_US) {
/* too long without FMU input, time to go to failsafe */
if (r_status_flags & PX4IO_P_STATUS_FLAGS_FMU_OK) {
isr_debug(1, "AP RX timeout");
}
PX4_ATOMIC_MODIFY_CLEAR(r_status_flags, (PX4IO_P_STATUS_FLAGS_FMU_OK));
PX4_ATOMIC_MODIFY_OR(r_status_alarms, PX4IO_P_STATUS_ALARMS_FMU_LOST);
} else {
PX4_ATOMIC_MODIFY_OR(r_status_flags, PX4IO_P_STATUS_FLAGS_FMU_OK);
/* this flag is never cleared once OK */
PX4_ATOMIC_MODIFY_OR(r_status_flags, PX4IO_P_STATUS_FLAGS_FMU_INITIALIZED);
if (system_state.fmu_data_received_time > last_fmu_update) {
new_fmu_data = true;
last_fmu_update = system_state.fmu_data_received_time;
}
}
/* default to failsafe mixing - it will be forced below if flag is set */
source = MIX_FAILSAFE;
/*
* Decide which set of controls we're using.
*/
/* Do not mix if we have raw PWM and FMU is ok. */
if ((r_status_flags & PX4IO_P_STATUS_FLAGS_RAW_PWM) &&
(r_status_flags & PX4IO_P_STATUS_FLAGS_FMU_OK)) {
if ((r_status_flags & PX4IO_P_STATUS_FLAGS_OVERRIDE) > 0) {
/* a channel based override has been
* triggered, with FMU active */
source = MIX_OVERRIDE_FMU_OK;
} else {
/* don't actually mix anything - copy values from r_page_direct_pwm */
source = MIX_NONE;
memcpy(r_page_servos, r_page_direct_pwm, sizeof(uint16_t)*PX4IO_SERVO_COUNT);
}
} else {
if (!(r_status_flags & PX4IO_P_STATUS_FLAGS_OVERRIDE) &&
(r_status_flags & PX4IO_P_STATUS_FLAGS_FMU_OK) &&
(r_status_flags & PX4IO_P_STATUS_FLAGS_MIXER_OK)) {
/* mix from FMU controls */
source = MIX_FMU;
}
else if (r_status_flags & PX4IO_P_STATUS_FLAGS_OVERRIDE) {
if (r_status_flags & PX4IO_P_STATUS_FLAGS_FMU_OK) {
/* if allowed, mix from RC inputs directly up to available rc channels */
source = MIX_OVERRIDE_FMU_OK;
} else {
/* if allowed, mix from RC inputs directly */
source = MIX_OVERRIDE;
}
}
}
/*
* Decide whether the servos should be armed right now.
*
* We must be armed, and we must have a PWM source; either raw from
* FMU or from the mixer.
*
*/
should_arm = (
/* IO initialised without error */ (r_status_flags & PX4IO_P_STATUS_FLAGS_INIT_OK)
/* and IO is armed */ && (r_status_flags & PX4IO_P_STATUS_FLAGS_SAFETY_OFF)
/* and FMU is armed */ && (
((r_setup_arming & PX4IO_P_SETUP_ARMING_FMU_ARMED)
/* and there is valid input via or mixer */ && (r_status_flags & PX4IO_P_STATUS_FLAGS_MIXER_OK))
/* or direct PWM is set */ || (r_status_flags & PX4IO_P_STATUS_FLAGS_RAW_PWM)
/* or failsafe was set manually */ || ((r_setup_arming & PX4IO_P_SETUP_ARMING_FAILSAFE_CUSTOM)
&& !(r_status_flags & PX4IO_P_STATUS_FLAGS_FMU_OK))
)
);
should_arm_nothrottle = (
/* IO initialised without error */ (r_status_flags & PX4IO_P_STATUS_FLAGS_INIT_OK)
/* and IO is armed */ && (r_status_flags & PX4IO_P_STATUS_FLAGS_SAFETY_OFF)
/* and there is valid input via or mixer */ && (r_status_flags & PX4IO_P_STATUS_FLAGS_MIXER_OK));
should_always_enable_pwm = (r_setup_arming & PX4IO_P_SETUP_ARMING_ALWAYS_PWM_ENABLE)
&& (r_status_flags & PX4IO_P_STATUS_FLAGS_INIT_OK)
&& (r_status_flags & PX4IO_P_STATUS_FLAGS_FMU_OK);
/*
* Check if failsafe termination is set - if yes,
* set the force failsafe flag once entering the first
* failsafe condition.
*/
if ( /* if we have requested flight termination style failsafe (noreturn) */
(r_setup_arming & PX4IO_P_SETUP_ARMING_TERMINATION_FAILSAFE) &&
/* and we ended up in a failsafe condition */
(source == MIX_FAILSAFE) &&
/* and we should be armed, so we intended to provide outputs */
should_arm &&
/* and FMU is initialized */
(r_status_flags & PX4IO_P_STATUS_FLAGS_FMU_INITIALIZED)) {
PX4_ATOMIC_MODIFY_OR(r_setup_arming, PX4IO_P_SETUP_ARMING_FORCE_FAILSAFE);
}
/*
* Check if we should force failsafe - and do it if we have to
*/
if (r_setup_arming & PX4IO_P_SETUP_ARMING_FORCE_FAILSAFE) {
source = MIX_FAILSAFE;
}
/*
* Set failsafe status flag depending on mixing source
*/
if (source == MIX_FAILSAFE) {
PX4_ATOMIC_MODIFY_OR(r_status_flags, PX4IO_P_STATUS_FLAGS_FAILSAFE);
} else {
PX4_ATOMIC_MODIFY_CLEAR(r_status_flags, (PX4IO_P_STATUS_FLAGS_FAILSAFE));
}
/*
* Set simple mixer trim values
* (there should be a "dirty" flag to indicate that r_page_servo_control_trim has changed)
*/
mixer_group.set_trims(r_page_servo_control_trim, PX4IO_SERVO_COUNT);
/*
* Run the mixers.
*/
if (source == MIX_FAILSAFE) {
/* copy failsafe values to the servo outputs */
for (unsigned i = 0; i < PX4IO_SERVO_COUNT; i++) {
r_page_servos[i] = r_page_servo_failsafe[i];
/* safe actuators for FMU feedback */
r_page_actuators[i] = FLOAT_TO_REG((r_page_servos[i] - 1500) / 600.0f);
}
} else if (source != MIX_NONE && (r_status_flags & PX4IO_P_STATUS_FLAGS_MIXER_OK)
&& !(r_setup_arming & PX4IO_P_SETUP_ARMING_LOCKDOWN)) {
float outputs[PX4IO_SERVO_COUNT];
unsigned mixed;
if (REG_TO_FLOAT(r_setup_slew_max) > FLT_EPSILON) {
/* maximum value the outputs of the multirotor mixer are allowed to change in this cycle
* factor 2 is needed because actuator outputs are in the range [-1,1]
*/
float delta_out_max = 2.0f * 1000.0f * dt / (r_page_servo_control_max[0] - r_page_servo_control_min[0]) / REG_TO_FLOAT(
r_setup_slew_max);
mixer_group.set_max_delta_out_once(delta_out_max);
}
/* mix */
/* update parameter for mc thrust model if it updated */
if (update_mc_thrust_param) {
mixer_group.set_thrust_factor(REG_TO_FLOAT(r_setup_thr_fac));
update_mc_thrust_param = false;
}
/* mix */
mixed = mixer_mix_threadsafe(&outputs[0], &r_mixer_limits);
/* the pwm limit call takes care of out of band errors */
pwm_limit_calc(should_arm, should_arm_nothrottle, mixed, r_setup_pwm_reverse, r_page_servo_disarmed,
r_page_servo_control_min, r_page_servo_control_max, outputs, r_page_servos, &pwm_limit);
/* clamp unused outputs to zero */
for (unsigned i = mixed; i < PX4IO_SERVO_COUNT; i++) {
r_page_servos[i] = 0;
outputs[i] = 0.0f;
}
/* store normalized outputs */
for (unsigned i = 0; i < PX4IO_SERVO_COUNT; i++) {
r_page_actuators[i] = FLOAT_TO_REG(outputs[i]);
}
if (mixed && new_fmu_data) {
new_fmu_data = false;
/* Trigger all timer's channels in Oneshot mode to fire
* the oneshots with updated values.
*/
up_pwm_update();
}
}
/* set arming */
bool needs_to_arm = (should_arm || should_arm_nothrottle || should_always_enable_pwm);
/* lockdown means to send a valid pulse which disables the outputs */
if (r_setup_arming & PX4IO_P_SETUP_ARMING_LOCKDOWN) {
needs_to_arm = true;
}
if (needs_to_arm && !mixer_servos_armed) {
/* need to arm, but not armed */
up_pwm_servo_arm(true);
mixer_servos_armed = true;
PX4_ATOMIC_MODIFY_OR(r_status_flags, PX4IO_P_STATUS_FLAGS_OUTPUTS_ARMED);
isr_debug(5, "> PWM enabled");
} else if (!needs_to_arm && mixer_servos_armed) {
/* armed but need to disarm */
up_pwm_servo_arm(false);
mixer_servos_armed = false;
PX4_ATOMIC_MODIFY_CLEAR(r_status_flags, (PX4IO_P_STATUS_FLAGS_OUTPUTS_ARMED));
isr_debug(5, "> PWM disabled");
}
if (mixer_servos_armed && (should_arm || should_arm_nothrottle)
&& !(r_setup_arming & PX4IO_P_SETUP_ARMING_LOCKDOWN)) {
/* update the servo outputs. */
for (unsigned i = 0; i < PX4IO_SERVO_COUNT; i++) {
up_pwm_servo_set(i, r_page_servos[i]);
}
/* set S.BUS1 or S.BUS2 outputs */
if (r_setup_features & PX4IO_P_SETUP_FEATURES_SBUS2_OUT) {
sbus2_output(_sbus_fd, r_page_servos, PX4IO_SERVO_COUNT);
} else if (r_setup_features & PX4IO_P_SETUP_FEATURES_SBUS1_OUT) {
sbus1_output(_sbus_fd, r_page_servos, PX4IO_SERVO_COUNT);
}
} else if (mixer_servos_armed && (should_always_enable_pwm
|| (r_setup_arming & PX4IO_P_SETUP_ARMING_LOCKDOWN))) {
/* set the disarmed servo outputs. */
for (unsigned i = 0; i < PX4IO_SERVO_COUNT; i++) {
up_pwm_servo_set(i, r_page_servo_disarmed[i]);
/* copy values into reporting register */
r_page_servos[i] = r_page_servo_disarmed[i];
}
/* set S.BUS1 or S.BUS2 outputs */
if (r_setup_features & PX4IO_P_SETUP_FEATURES_SBUS1_OUT) {
sbus1_output(_sbus_fd, r_page_servo_disarmed, PX4IO_SERVO_COUNT);
}
if (r_setup_features & PX4IO_P_SETUP_FEATURES_SBUS2_OUT) {
sbus2_output(_sbus_fd, r_page_servo_disarmed, PX4IO_SERVO_COUNT);
}
}
}
