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[esp32_touch] Fix touch v1 (#9414)

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Jonathan Swoboda 2025-07-09 20:18:01 -04:00 committed by Jesse Hills
parent bd75f0dfea
commit 92d03dd196
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1 changed files with 12 additions and 10 deletions
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22
esphome/components/esp32_touch/esp32_touch_v1.cpp
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@ -109,6 +109,7 @@ void ESP32TouchComponent::loop() {
// Only publish if state changed - this filters out repeated events
if (new_state != child->last_state_) {
child->initial_state_published_ = true;
child->last_state_ = new_state;
child->publish_state(new_state);
// Original ESP32: ISR only fires when touched, release is detected by timeout
@ -175,6 +176,9 @@ void ESP32TouchComponent::on_shutdown() {
void IRAM_ATTR ESP32TouchComponent::touch_isr_handler(void *arg) {
ESP32TouchComponent *component = static_cast<ESP32TouchComponent *>(arg);
uint32_t mask = 0;
touch_ll_read_trigger_status_mask(&mask);
touch_ll_clear_trigger_status_mask();
touch_pad_clear_status();
// INTERRUPT BEHAVIOR: On ESP32 v1 hardware, the interrupt fires when ANY configured
@ -184,6 +188,11 @@ void IRAM_ATTR ESP32TouchComponent::touch_isr_handler(void *arg) {
// as any pad remains touched. This allows us to detect both new touches and
// continued touches, but releases must be detected by timeout in the main loop.
// IMPORTANT: ESP32 v1 touch detection logic - INVERTED compared to v2!
// ESP32 v1: Touch is detected when capacitance INCREASES, causing the measured value to DECREASE
// Therefore: touched = (value < threshold)
// This is opposite to ESP32-S2/S3 v2 where touched = (value > threshold)
// Process all configured pads to check their current state
// Note: ESP32 v1 doesn't tell us which specific pad triggered the interrupt,
// so we must scan all configured pads to find which ones were touched
@ -201,19 +210,12 @@ void IRAM_ATTR ESP32TouchComponent::touch_isr_handler(void *arg) {
value = touch_ll_read_raw_data(pad);
}
// Skip pads with 0 value - they haven't been measured in this cycle
// This is important: not all pads are measured every interrupt cycle,
// only those that the hardware has updated
if (value == 0) {
// Skip pads that aren’t in the trigger mask
bool is_touched = (mask >> pad) & 1;
if (!is_touched) {
continue;
}
// IMPORTANT: ESP32 v1 touch detection logic - INVERTED compared to v2!
// ESP32 v1: Touch is detected when capacitance INCREASES, causing the measured value to DECREASE
// Therefore: touched = (value < threshold)
// This is opposite to ESP32-S2/S3 v2 where touched = (value > threshold)
bool is_touched = value < child->get_threshold();
// Always send the current state - the main loop will filter for changes
// We send both touched and untouched states because the ISR doesn't
// track previous state (to keep ISR fast and simple)