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trigger_analog: Add initial support for detecting "tap" events
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Add a new "diff_peak_gt" trigger type.  This will be useful with
detecting ldc1612 "tap" events.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2026-01-22 11:40:40 -05:00
parent 9a97ade74f
commit c9d904aa9d
1 changed files with 25 additions and 6 deletions
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31
src/trigger_analog.c
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@ -22,12 +22,13 @@ struct trigger_analog {
// Filtering
struct sos_filter *sf;
// Trigger value checking
int32_t trigger_value;
int32_t trigger_value, trigger_peak;
uint32_t trigger_clock;
uint8_t trigger_type;
// Trsync triggering
uint8_t flags, trigger_reason, error_reason;
struct trsync *ts;
uint32_t homing_clock, trigger_clock;
uint32_t homing_clock;
// Sensor activity monitoring
uint8_t monitor_max, monitor_count;
struct timer time;
@ -41,10 +42,11 @@ enum {
// Trigger types
enum {
TT_ABS_GE, TT_GT
TT_ABS_GE, TT_GT, TT_DIFF_PEAK_GT
};
DECL_ENUMERATION("trigger_analog_type", "abs_ge", TT_ABS_GE);
DECL_ENUMERATION("trigger_analog_type", "gt", TT_GT);
DECL_ENUMERATION("trigger_analog_type", "diff_peak_gt", TT_DIFF_PEAK_GT);
// Sample errors sent via trsync error code
enum {
@ -85,17 +87,34 @@ monitor_note_activity(struct trigger_analog *ta)
// Check if a value should signal a "trigger" event
static int
check_trigger(struct trigger_analog *ta, int32_t value)
check_trigger(struct trigger_analog *ta, uint32_t time, int32_t value)
{
switch (ta->trigger_type) {
case TT_ABS_GE:
ta->trigger_clock = time;
return abs(value) >= ta->trigger_value;
case TT_GT:
ta->trigger_clock = time;
return value > ta->trigger_value;
case TT_DIFF_PEAK_GT:
if (value > ta->trigger_peak) {
ta->trigger_clock = time;
ta->trigger_peak = value;
return 0;
}
uint32_t delta = ta->trigger_peak - value;
return delta > ta->trigger_value;
}
return 0;
}
// Reset fields associated with trigger checking
static void
trigger_reset(struct trigger_analog *ta)
{
ta->trigger_peak = INT32_MIN;
}
// Stop homing due to an error
static void
cancel_homing(struct trigger_analog *ta, uint8_t error_code)
@ -150,10 +169,9 @@ trigger_analog_update(struct trigger_analog *ta, int32_t sample)
}
// Check if this is a "trigger"
ret = check_trigger(ta, filtered_value);
ret = check_trigger(ta, time, filtered_value);
if (ret) {
trsync_do_trigger(ta->ts, ta->trigger_reason);
ta->trigger_clock = time;
flags = 0;
}
@ -220,6 +238,7 @@ command_trigger_analog_home(uint32_t *args)
ta->monitor_count = 0;
ta->time.func = monitor_event;
ta->flags = TA_AWAIT_HOMING | TA_CAN_TRIGGER;
trigger_reset(ta);
sched_add_timer(&ta->time);
}
DECL_COMMAND(command_trigger_analog_home,