fix: update DALI double send delay and increase SPIRAM malloc reserve size

This commit fix the crash risk when bus abnormal.

Signed-off-by: Tony <tonylu@tony-cloud.com>

apps/gateway/main/app_main.cpp

@@ -73,6 +73,10 @@
 #define CONFIG_GATEWAY_USB_SETUP_READ_TIMEOUT_MS 20
 #endif
 
+#ifndef CONFIG_DALI_BUS_RESET_PULSE_MS
+#define CONFIG_DALI_BUS_RESET_PULSE_MS 10
+#endif
+
 #ifndef CONFIG_GATEWAY_485_CONTROL_BAUDRATE
 #define CONFIG_GATEWAY_485_CONTROL_BAUDRATE 9600
 #endif
@@ -1284,6 +1288,7 @@ extern "C" void app_main(void) {
     usb_config.rx_buffer_size = static_cast<size_t>(CONFIG_GATEWAY_USB_SETUP_RX_BUFFER);
     usb_config.tx_buffer_size = static_cast<size_t>(CONFIG_GATEWAY_USB_SETUP_TX_BUFFER);
     usb_config.read_timeout_ms = static_cast<uint32_t>(CONFIG_GATEWAY_USB_SETUP_READ_TIMEOUT_MS);
+    usb_config.reset_pulse_ms = static_cast<uint32_t>(CONFIG_DALI_BUS_RESET_PULSE_MS);
     s_usb_setup_bridge = std::make_unique<gateway::GatewayUsbSetupBridge>(*s_controller,
                                                                           *s_dali_domain,
                                                                           usb_config);

apps/gateway/sdkconfig

@@ -2919,7 +2919,7 @@ CONFIG_DALI_CUSTOM_HALF_BIT_TIME_X100_US=0
 CONFIG_DALI_TX_STOP_CONDITION_US=0
 CONFIG_DALI_RX_STOP_CONDITION_US=0
 CONFIG_DALI_QUERY_RESPONSE_TIMEOUT_MS=30
-CONFIG_DALI_DOUBLE_SEND_DELAY_MS=20
+CONFIG_DALI_DOUBLE_SEND_DELAY_MS=30
 CONFIG_DALI_FORWARD_ACTIVITY_WAIT_MS=20
 CONFIG_DALI_FORWARD_AFTER_BACKWARD_WAIT_MS=10
 CONFIG_DALI_FORWARD_MAX_WAIT_MS=50

apps/gateway/sdkconfig.old

@@ -1861,7 +1861,7 @@ CONFIG_SPIRAM_USE_MALLOC=y
 CONFIG_SPIRAM_MEMTEST=y
 CONFIG_SPIRAM_MALLOC_ALWAYSINTERNAL=16384
 CONFIG_SPIRAM_TRY_ALLOCATE_WIFI_LWIP=y
-CONFIG_SPIRAM_MALLOC_RESERVE_INTERNAL=32768
+CONFIG_SPIRAM_MALLOC_RESERVE_INTERNAL=65535
 # CONFIG_SPIRAM_ALLOW_BSS_SEG_EXTERNAL_MEMORY is not set
 # CONFIG_SPIRAM_ALLOW_NOINIT_SEG_EXTERNAL_MEMORY is not set
 # end of SPI RAM config
@@ -2480,9 +2480,9 @@ CONFIG_LWIP_HOOK_IP6_INPUT_DEFAULT=y
 #
 # mbedTLS
 #
-CONFIG_MBEDTLS_INTERNAL_MEM_ALLOC=y
+# CONFIG_MBEDTLS_INTERNAL_MEM_ALLOC is not set
 # CONFIG_MBEDTLS_EXTERNAL_MEM_ALLOC is not set
-# CONFIG_MBEDTLS_DEFAULT_MEM_ALLOC is not set
+CONFIG_MBEDTLS_DEFAULT_MEM_ALLOC=y
 # CONFIG_MBEDTLS_CUSTOM_MEM_ALLOC is not set
 CONFIG_MBEDTLS_ASYMMETRIC_CONTENT_LEN=y
 CONFIG_MBEDTLS_SSL_IN_CONTENT_LEN=16384
@@ -2646,7 +2646,7 @@ CONFIG_STDATOMIC_S32C1I_SPIRAM_WORKAROUND=y
 # CONFIG_NVS_ENCRYPTION is not set
 # CONFIG_NVS_ASSERT_ERROR_CHECK is not set
 # CONFIG_NVS_LEGACY_DUP_KEYS_COMPATIBILITY is not set
-# CONFIG_NVS_ALLOCATE_CACHE_IN_SPIRAM is not set
+CONFIG_NVS_ALLOCATE_CACHE_IN_SPIRAM=y
 # end of NVS
 
 #

components/dali/Kconfig

@@ -109,13 +109,31 @@ config DALI_BUS_POWER_CHECK_INTERVAL_MS
         power-down. This lets the HAL recover when the bus was already powered
         before gateway startup and no RX edge is generated.
 
+config DALI_BUS_FAIL_EVENT_DELAY_MS
+    int "Bus fail event delay ms"
+    range 1 60000
+    default 45
+    help
+        Continuous low-bus duration required before publishing the legacy FF FD
+        bus-abnormal raw frame for the first time. Repeat reports are controlled
+        separately by DALI_BUS_ABNORMAL_REPORT_INTERVAL_MS.
+
 config DALI_BUS_ABNORMAL_REPORT_INTERVAL_MS
     int "Legacy bus abnormal report interval ms"
     range 0 60000
     default 3000
     help
-        Interval for publishing the legacy two-byte FF FD bus-abnormal raw frame
+        Repeat interval for publishing the legacy two-byte FF FD bus-abnormal raw
-        while the native DALI bus is power-down. Set to 0 to disable the report.
+        frame while the native DALI bus remains failed. Set to 0 to disable both
+        the first and repeated reports.
+
+config DALI_BUS_RESET_PULSE_MS
+    int "Bus reset low pulse ms"
+    range 1 1000
+    default 10
+    help
+        Default duration for the native physical DALI bus reset pulse. The USB
+        setup bridge uses this value for short command 01 00 00.
 
 choice DALI_LOG_LEVEL_CHOICE
     prompt "DALI log level"

components/dali/README.md

@@ -45,16 +45,21 @@ Use `menuconfig` under `DALI Component` to configure:
     TX/RX stop conditions, query response timeout, double-send delay, and TX queue
     arbitration waits.
 - TX/RX active polarity. The native gateway default is TX active low and RX active high.
-- Native bus power-down polling and legacy `FF FD` bus-abnormal raw-frame reporting intervals.
+- Native bus power-down polling, first bus-fail event delay, legacy `FF FD`
+    bus-abnormal raw-frame repeat interval, and physical bus reset pulse duration.
 - Native DALI HAL log level for the `dali_hal` ESP-IDF log tag.
 - Queue sizes.
 - Task stack sizes and priorities.
 - Optional debug task.
 
 The native bus monitor uses `CONFIG_DALI_BUS_POWER_CHECK_INTERVAL_MS` to resample RX while
-power-down and `CONFIG_DALI_BUS_ABNORMAL_REPORT_INTERVAL_MS` to publish legacy `FF FD`
+power-down, `CONFIG_DALI_BUS_FAIL_EVENT_DELAY_MS` to publish the first legacy `FF FD`
-raw frames while down. The report interval defaults to 3000 ms; set it to 0 to disable the
+raw frame after a continuous low-bus failure, and
-compatibility report.
+`CONFIG_DALI_BUS_ABNORMAL_REPORT_INTERVAL_MS` for repeat reports while the bus remains
+failed. The first delay defaults to 45 ms and the repeat interval defaults to 3000 ms;
+set the repeat interval to 0 to disable the compatibility report. USB setup command
+`01 00 00` uses `CONFIG_DALI_BUS_RESET_PULSE_MS` to drive the bus low intentionally for
+a physical reset pulse, defaulting to 10 ms.
 
 Native timing defaults target standard 1200 bps DALI: a 416.67 us half-bit period is
 generated by the default 3.636363 MHz timer. `CONFIG_DALI_CUSTOM_HALF_BIT_TIME_X100_US`

components/dali/src/dali_hal_idf5.c

@@ -83,10 +83,18 @@
 #define CONFIG_DALI_BUS_POWER_CHECK_INTERVAL_MS 500
 #endif
 
+#ifndef CONFIG_DALI_BUS_FAIL_EVENT_DELAY_MS
+#define CONFIG_DALI_BUS_FAIL_EVENT_DELAY_MS 45
+#endif
+
 #ifndef CONFIG_DALI_BUS_ABNORMAL_REPORT_INTERVAL_MS
 #define CONFIG_DALI_BUS_ABNORMAL_REPORT_INTERVAL_MS 3000
 #endif
 
+#ifndef CONFIG_DALI_BUS_RESET_PULSE_MS
+#define CONFIG_DALI_BUS_RESET_PULSE_MS 10
+#endif
+
 #ifndef CONFIG_DALI_FORWARD_ACTIVITY_WAIT_MS
 #define CONFIG_DALI_FORWARD_ACTIVITY_WAIT_MS 20
 #endif
@@ -109,6 +117,7 @@
 #define DALI_BAUDRATE_MIN 400U
 #define DALI_BAUDRATE_MAX 2400U
 #define DALI_BUS_POWER_CHECK_INTERVAL_US ((uint64_t)CONFIG_DALI_BUS_POWER_CHECK_INTERVAL_MS * 1000ULL)
+#define DALI_BUS_FAIL_EVENT_DELAY_US ((uint64_t)CONFIG_DALI_BUS_FAIL_EVENT_DELAY_MS * 1000ULL)
 #define DALI_BUS_ABNORMAL_REPORT_INTERVAL_US ((uint64_t)CONFIG_DALI_BUS_ABNORMAL_REPORT_INTERVAL_MS * 1000ULL)
 
 typedef struct {
@@ -151,7 +160,10 @@ typedef struct {
     uint8_t tx_level;
 
     uint64_t bus_level_check_time;
+    uint64_t bus_low_since_time;
     uint64_t bus_abnormal_report_time;
+    uint64_t bus_abnormal_suppress_until;
+    bool bus_fail_reported;
 
     Dali_msg_t tx_data;
     bool bus_activity_seen;
@@ -526,6 +538,48 @@ static UBaseType_t queue_waiting(QueueHandle_t queue)
     return queue ? uxQueueMessagesWaiting(queue) : 0;
 }
 
+static void IRAM_ATTR reset_rx_state_from_isr(dali_bus_ctx_t *bus)
+{
+    if (bus == NULL) {
+        return;
+    }
+    bus->rx_state = RX_STATE_IDLE;
+    bus->rx_half_bit_counter = 0;
+    bus->rx_data_bit_counter = 0;
+    bus->rx_data.status = DALI_FRAME_UNKNOWN;
+    bus->rx_data.length = 0;
+}
+
+static void IRAM_ATTR reset_tx_counters_from_isr(dali_bus_ctx_t *bus)
+{
+    if (bus == NULL) {
+        return;
+    }
+    bus->tx_half_bit_counter = 0;
+    bus->tx_data_bit_counter = 0;
+}
+
+static void reset_rx_state(dali_bus_ctx_t *bus)
+{
+    if (bus == NULL) {
+        return;
+    }
+    bus->rx_state = RX_STATE_IDLE;
+    bus->rx_half_bit_counter = 0;
+    bus->rx_data_bit_counter = 0;
+    bus->rx_data.status = DALI_FRAME_UNKNOWN;
+    bus->rx_data.length = 0;
+}
+
+static void reset_tx_counters(dali_bus_ctx_t *bus)
+{
+    if (bus == NULL) {
+        return;
+    }
+    bus->tx_half_bit_counter = 0;
+    bus->tx_data_bit_counter = 0;
+}
+
 static void log_tx_message(const char *prefix, const dali_bus_ctx_t *bus,
                            const Dali_msg_t *msg, uint32_t timeout_ms)
 {
@@ -576,11 +630,8 @@ static void recover_tx_timeout(dali_bus_ctx_t *bus)
 
     bus->tx_data.status = DALI_FRAME_ERROR;
     bus->tx_state = TX_STATE_IDLE;
-    bus->rx_state = RX_STATE_IDLE;
+    reset_rx_state(bus);
-    bus->tx_half_bit_counter = 0;
+    reset_tx_counters(bus);
-    bus->tx_data_bit_counter = 0;
-    bus->rx_half_bit_counter = 0;
-    bus->rx_data_bit_counter = 0;
     if (bus->bus_state == DALI_BUS_TRANSMITTING || bus->bus_state == DALI_BUS_TIME_BREAK ||
         bus->bus_state == DALI_BUS_RECOVERY) {
         bus->tx_last_edge_time = esp_timer_get_time();
@@ -620,22 +671,82 @@ static void IRAM_ATTR publish_bus_abnormal_from_isr(dali_bus_ctx_t *bus, BaseTyp
     }
 }
 
-static void IRAM_ATTR maybe_report_bus_abnormal_from_isr(dali_bus_ctx_t *bus, uint64_t time_now,
+static void IRAM_ATTR update_bus_low_tracking_from_isr(dali_bus_ctx_t *bus,
-                                                         BaseType_t *yield)
+                                                       uint64_t time_now,
+                                                       uint8_t current_level)
 {
-    if (bus == NULL || DALI_BUS_ABNORMAL_REPORT_INTERVAL_US == 0) {
+    if (bus == NULL) {
         return;
     }
-    if (!interval_elapsed_us(time_now, bus->bus_abnormal_report_time,
+    if (current_level == 0) {
-                             DALI_BUS_ABNORMAL_REPORT_INTERVAL_US)) {
+        if (bus->bus_low_since_time == 0) {
+            bus->bus_low_since_time = time_now;
+        }
         return;
     }
-    publish_bus_abnormal_from_isr(bus, yield);
+    bus->bus_low_since_time = 0;
-    bus->bus_abnormal_report_time = time_now;
+    bus->bus_fail_reported = false;
+    bus->bus_abnormal_report_time = 0;
+    bus->bus_abnormal_suppress_until = 0;
 }
 
-static void IRAM_ATTR poll_power_down_bus_from_isr(dali_bus_ctx_t *bus, uint64_t time_now,
+static void IRAM_ATTR maybe_report_low_bus_abnormal_from_isr(dali_bus_ctx_t *bus,
+                                                             uint64_t time_now,
+                                                             uint8_t current_level,
                                                              BaseType_t *yield)
+{
+    if (bus == NULL || DALI_BUS_ABNORMAL_REPORT_INTERVAL_US == 0 || current_level != 0 ||
+        bus->bus_low_since_time == 0) {
+        return;
+    }
+    if (bus->bus_abnormal_suppress_until != 0 && time_now < bus->bus_abnormal_suppress_until) {
+        return;
+    }
+    if ((time_now - bus->bus_low_since_time) < DALI_BUS_FAIL_EVENT_DELAY_US) {
+        return;
+    }
+
+    if (!bus->bus_fail_reported) {
+        publish_bus_abnormal_from_isr(bus, yield);
+        bus->bus_fail_reported = true;
+        bus->bus_abnormal_report_time = time_now;
+        return;
+    }
+
+    if (interval_elapsed_us(time_now, bus->bus_abnormal_report_time,
+                            DALI_BUS_ABNORMAL_REPORT_INTERVAL_US)) {
+        publish_bus_abnormal_from_isr(bus, yield);
+        bus->bus_abnormal_report_time = time_now;
+    }
+}
+
+static void IRAM_ATTR resample_stale_bus_level_from_isr(dali_bus_ctx_t *bus,
+                                                        uint64_t time_now,
+                                                        uint32_t rx_delta,
+                                                        uint8_t current_level)
+{
+    if (bus == NULL || current_level == bus->rx_level) {
+        return;
+    }
+
+    bool should_resample = bus->bus_state == DALI_BUS_POWER_DOWN ||
+                           bus->bus_state <= DALI_BUS_ERROR ||
+                           (bus->bus_state == DALI_BUS_READY &&
+                            (bus->rx_state != RX_STATE_IDLE || bus->rx_level == 0) &&
+                            rx_delta > s_timing.rx_hb_max) ||
+                           (bus->bus_state == DALI_BUS_RECEIVING &&
+                            bus->rx_state == RX_STATE_START &&
+                            rx_delta > s_timing.rx_hb_max);
+    if (!should_resample) {
+        return;
+    }
+
+    bus->rx_level = current_level;
+    bus->rx_last_edge_time = time_now;
+    bus->bus_activity_seen = true;
+}
+
+static void IRAM_ATTR poll_power_down_bus_from_isr(dali_bus_ctx_t *bus, uint64_t time_now)
 {
     if (bus == NULL || bus->bus_state != DALI_BUS_POWER_DOWN) {
         return;
@@ -650,8 +761,6 @@ static void IRAM_ATTR poll_power_down_bus_from_isr(dali_bus_ctx_t *bus, uint64_t
             bus->rx_last_edge_time = time_now;
         }
     }
-
-    maybe_report_bus_abnormal_from_isr(bus, time_now, yield);
 }
 
 static inline void publish_rx_frame_from_isr(Dali_msg_t *msg, QueueHandle_t queue, BaseType_t *yield)
@@ -884,9 +993,20 @@ static bool IRAM_ATTR handle_bus_timer(dali_bus_ctx_t *bus, uint64_t time_now)
         bus->tx_last_edge_time = time_now - MAX_DELTA_RELOAD_TIME/2;  // half of max time
     }
 
-    poll_power_down_bus_from_isr(bus, time_now, &yield);
+    uint8_t current_level = DALI_GET_BUS_LEVEL(bus);
+    update_bus_low_tracking_from_isr(bus, time_now, current_level);
+    resample_stale_bus_level_from_isr(bus, time_now, rx_delta, current_level);
+    poll_power_down_bus_from_isr(bus, time_now);
     rx_delta = time_now - bus->rx_last_edge_time;
     tx_delta = time_now - bus->tx_last_edge_time;
+    current_level = DALI_GET_BUS_LEVEL(bus);
+    update_bus_low_tracking_from_isr(bus, time_now, current_level);
+    maybe_report_low_bus_abnormal_from_isr(bus, time_now, current_level, &yield);
+
+    if (bus->bus_state == DALI_BUS_READY && bus->rx_state != RX_STATE_IDLE &&
+        rx_delta > s_timing.rx_hb_max) {
+        reset_rx_state_from_isr(bus);
+    }
 
     if (bus->bus_state == DALI_BUS_TRANSMITTING && bus->tx_state == TX_STATE_STOP &&
         DALI_GET_TX_LEVEL(bus) == 1 &&
@@ -901,18 +1021,21 @@ static bool IRAM_ATTR handle_bus_timer(dali_bus_ctx_t *bus, uint64_t time_now)
     {   // 101.8.2.4 - startup BUS after 2.4ms
         if(bus->rx_level==1 && rx_delta > s_timing.rx_stop_cond)
         {
+            DALI_SET_BUS_HIGH(bus);
+            reset_rx_state_from_isr(bus);
+            reset_tx_counters_from_isr(bus);
             bus->bus_state = DALI_BUS_READY;  // bus is ready
         }
     }
     // if bus power down - if bus is low for more then 45ms
-    if(bus->rx_level==0 && rx_delta > s_timing.time_bus_down)
+    if(current_level == 0 && bus->bus_low_since_time != 0 &&
+       (time_now - bus->bus_low_since_time) > s_timing.time_bus_down)
     {   // power lost
         bool entered_power_down = bus->bus_state != DALI_BUS_POWER_DOWN;
         bus->bus_state = DALI_BUS_POWER_DOWN;  // bus is power down - recovery see previous if
         DALI_SET_BUS_HIGH(bus);   // make sure TX is high
         if (entered_power_down) {
             bus->bus_level_check_time = time_now;
-            bus->bus_abnormal_report_time = time_now;
         }
 
     }
@@ -940,6 +1063,8 @@ static bool IRAM_ATTR handle_bus_timer(dali_bus_ctx_t *bus, uint64_t time_now)
     }
     else if(bus->bus_state == DALI_BUS_RECOVERY && rx_delta > s_timing.time_recovery_min)
     {
+        reset_rx_state_from_isr(bus);
+        reset_tx_counters_from_isr(bus);
         bus->bus_state = DALI_BUS_READY;  // bus is ready
         // immediately start transmitting if we have data
     }
@@ -1025,6 +1150,7 @@ static bool IRAM_ATTR handle_bus_timer(dali_bus_ctx_t *bus, uint64_t time_now)
             xQueueSendToBackFromISR(bus->tx_reply_queue, &bus->tx_data, &yield); // send data to queue
         }
         bus->tx_state = TX_STATE_IDLE;  // clear state
+        reset_tx_counters_from_isr(bus);
     }
 
     // recover receiving
@@ -1280,7 +1406,10 @@ static esp_err_t init_bus(uint8_t bus_id, uint8_t tx_pin, uint8_t rx_pin)
     bus->rx_level = DALI_GET_BUS_LEVEL(bus);              // get level of RX pin
     bus->tx_last_edge_time = bus->rx_last_edge_time;
     bus->bus_level_check_time = bus->rx_last_edge_time;
+    bus->bus_low_since_time = bus->rx_level == 0 ? bus->rx_last_edge_time : 0;
     bus->bus_abnormal_report_time = 0;
+    bus->bus_abnormal_suppress_until = 0;
+    bus->bus_fail_reported = false;
     bus->bus_activity_seen = false;
     bus->rx_last_frame_time = 0;
     bus->rx_last_frame_length = 0;
@@ -1513,6 +1642,104 @@ esp_err_t dali_hal_get_bus_info(uint8_t bus_id, dali_hal_bus_info_t *info)
     return ESP_OK;
 }
 
+esp_err_t dali_hal_pulse_bus_low(uint8_t bus_id, uint32_t duration_ms)
+{
+    if (bus_id >= DALI_PHY_COUNT) {
+        return ESP_ERR_INVALID_ARG;
+    }
+    if (duration_ms == 0) {
+        duration_ms = CONFIG_DALI_BUS_RESET_PULSE_MS;
+    }
+
+    dali_hal_lock();
+    esp_err_t err = ensure_timing_ready_locked();
+    if (err != ESP_OK) {
+        dali_hal_unlock();
+        return err;
+    }
+    dali_bus_ctx_t *bus = &s_bus[bus_id];
+    if (!bus->inited) {
+        dali_hal_unlock();
+        return ESP_ERR_INVALID_STATE;
+    }
+
+    const uint64_t start_time = esp_timer_get_time();
+    const uint64_t duration_us = (uint64_t)duration_ms * 1000ULL;
+    const bool had_tx = bus->tx_state > TX_STATE_IDLE || queue_waiting(bus->tx_queue) > 0;
+    Dali_msg_t failed_tx = bus->tx_data;
+    failed_tx.status = DALI_FRAME_ERROR;
+
+    err = gpio_intr_disable(bus->rx_pin);
+    if (err != ESP_OK) {
+        dali_hal_unlock();
+        return err;
+    }
+
+    if (bus->tx_queue) {
+        xQueueReset(bus->tx_queue);
+    }
+    if (bus->tx_reply_queue) {
+        xQueueReset(bus->tx_reply_queue);
+        if (had_tx && !is_backward_tx_msg(&failed_tx)) {
+            xQueueSendToBack(bus->tx_reply_queue, &failed_tx, 0);
+        }
+    }
+
+    bus->force_backward_tx = false;
+    bus->tx_state = TX_STATE_IDLE;
+    bus->tx_data.status = DALI_FRAME_ERROR;
+    reset_rx_state(bus);
+    reset_tx_counters(bus);
+    bus->bus_activity_seen = true;
+    bus->bus_state = DALI_BUS_POWER_DOWN;
+    bus->bus_level_check_time = start_time;
+    bus->bus_abnormal_report_time = 0;
+    bus->bus_fail_reported = false;
+    bus->bus_abnormal_suppress_until =
+        start_time + duration_us + DALI_BUS_FAIL_EVENT_DELAY_US + s_timing.rx_stop_cond;
+
+    DALI_SET_BUS_LOW(bus);
+    bus->rx_level = DALI_GET_BUS_LEVEL(bus);
+    bus->rx_last_edge_time = start_time;
+    bus->tx_last_edge_time = start_time;
+    bus->bus_low_since_time = bus->rx_level == 0 ? start_time : 0;
+    dali_hal_unlock();
+
+    TickType_t delay_ticks = pdMS_TO_TICKS(duration_ms);
+    if (delay_ticks == 0) {
+        delay_ticks = 1;
+    }
+    vTaskDelay(delay_ticks);
+
+    dali_hal_lock();
+    const uint64_t end_time = esp_timer_get_time();
+    DALI_SET_BUS_HIGH(bus);
+    bus->rx_level = DALI_GET_BUS_LEVEL(bus);
+    bus->rx_last_edge_time = end_time;
+    bus->tx_last_edge_time = end_time;
+    bus->bus_level_check_time = end_time;
+    bus->bus_low_since_time = bus->rx_level == 0 ? end_time : 0;
+    bus->bus_abnormal_report_time = 0;
+    bus->bus_fail_reported = false;
+    if (bus->rx_level == 1) {
+        bus->bus_abnormal_suppress_until = 0;
+        bus->bus_state = DALI_BUS_READY;
+    } else {
+        bus->bus_abnormal_suppress_until =
+            end_time + DALI_BUS_FAIL_EVENT_DELAY_US + s_timing.rx_stop_cond;
+        bus->bus_state = DALI_BUS_POWER_DOWN;
+    }
+    bus->tx_state = TX_STATE_IDLE;
+    reset_rx_state(bus);
+    reset_tx_counters(bus);
+    gpio_intr_enable(bus->rx_pin);
+    dali_hal_unlock();
+
+    ESP_LOGI(TAG, "bus=%u physical reset pulse complete durationMs=%lu", bus_id,
+             (unsigned long)duration_ms);
+    return ESP_OK;
+}
+
 QueueHandle_t dali_hal_raw_receive_queue(void)
 {
     ensure_common_queues();

components/dali/src/include/dali_hal.h

@@ -238,10 +238,10 @@ esp_err_t dali_hal_set_baudrate(uint32_t baudrate);
 uint32_t dali_hal_get_baudrate(void);
 size_t dali_hal_get_inited_buses(uint8_t *ids, size_t max_ids);
 esp_err_t dali_hal_get_bus_info(uint8_t bus_id, dali_hal_bus_info_t *info);
+esp_err_t dali_hal_pulse_bus_low(uint8_t bus_id, uint32_t duration_ms);
 QueueHandle_t dali_hal_raw_receive_queue(void);
 void dali_task(void *pvParameters);
 
 #ifdef __cplusplus
 }
 #endif
-

components/dali_domain/include/dali_domain.hpp

@@ -129,6 +129,7 @@ class DaliDomainService {
   void addRawFrameSink(std::function<void(const DaliRawFrame& frame)> sink);
 
   bool resetBus(uint8_t gateway_id) const;
+  bool pulseBusLow(uint8_t gateway_id, uint32_t duration_ms) const;
   bool isBusIdle(uint8_t gateway_id, uint32_t quiet_ms) const;
   void markHostActivity(uint8_t gateway_id) const;
   void markHostCommandFrame(uint8_t gateway_id, uint8_t raw_addr, uint8_t command) const;

components/dali_domain/src/dali_domain.cpp

@@ -305,6 +305,7 @@ std::vector<uint8_t> TransactHardwareFrame(uint8_t bus_id, const uint8_t* data,
   switch (data[0]) {
     case 0x00:
       ESP_LOGD(TAG, "received reset for bus=%u", bus_id);
+      return {1};
     case 0x01:
       return {1};
     case 0x10:
@@ -650,8 +651,11 @@ std::vector<DaliChannelInfo> DaliDomainService::channelInfo() const {
   std::vector<DaliChannelInfo> info;
   info.reserve(channels_.size());
   for (const auto& channel : channels_) {
-    DaliChannelInfo item{channel->config.channel_index, channel->config.gateway_id,
+    DaliChannelInfo item;
-                         channel->phy_kind, channel->config.name};
+    item.channel_index = channel->config.channel_index;
+    item.gateway_id = channel->config.gateway_id;
+    item.phy_kind = channel->phy_kind;
+    item.name = channel->config.name;
     if (channel->hardware_bus.has_value()) {
       item.native_bus_id = channel->hardware_bus->bus_id;
     }
@@ -707,6 +711,15 @@ bool DaliDomainService::resetBus(uint8_t gateway_id) const {
   return channel->comm->resetBus();
 }
 
+bool DaliDomainService::pulseBusLow(uint8_t gateway_id, uint32_t duration_ms) const {
+  const auto* channel = findChannelByGateway(gateway_id);
+  if (channel == nullptr || !channel->hardware_bus.has_value()) {
+    return false;
+  }
+  markBusActivity(gateway_id);
+  return dali_hal_pulse_bus_low(channel->hardware_bus->bus_id, duration_ms) == ESP_OK;
+}
+
 bool DaliDomainService::isBusIdle(uint8_t gateway_id, uint32_t quiet_ms) const {
   TickType_t last_activity = 0;
   if (bus_activity_lock_ != nullptr) {

components/gateway_usb_setup/include/gateway_usb_setup.hpp

@@ -20,6 +20,7 @@ struct GatewayUsbSetupBridgeConfig {
   size_t tx_buffer_size{256};
   uint32_t read_timeout_ms{20};
   uint32_t write_timeout_ms{20};
+  uint32_t reset_pulse_ms{10};
   uint32_t task_stack_size{4096};
   UBaseType_t task_priority{4};
 };

components/gateway_usb_setup/src/gateway_usb_setup.cpp

@@ -89,6 +89,22 @@ void GatewayUsbSetupBridge::handleBytes(const uint8_t* data, size_t len) {
   }
 
   const uint8_t gateway_id = setupGatewayId();
+  if (len == 3 && data[0] == 0x01 && data[1] == 0x00 && data[2] == 0x00) {
+    const bool ok = dali_domain_.pulseBusLow(gateway_id, config_.reset_pulse_ms);
+    const uint8_t response[2] = {static_cast<uint8_t>(ok ? 0x01 : 0xFD), 0x00};
+    const int written = usb_serial_jtag_write_bytes(response, sizeof(response),
+                                                   pdMS_TO_TICKS(config_.write_timeout_ms));
+    if (written < 0 || static_cast<size_t>(written) != sizeof(response)) {
+      ESP_LOGW(kTag, "failed to write USB bus reset response channel=%u ok=%u",
+               config_.channel_index, ok ? 1 : 0);
+    }
+    if (!ok) {
+      ESP_LOGW(kTag, "failed to pulse DALI bus low for USB reset channel=%u gateway=%u",
+               config_.channel_index, gateway_id);
+    }
+    return;
+  }
+
   if (data[0] == 0x12) {
     const auto response = dali_domain_.transactBridgeFrame(gateway_id, data, len);
     if (!response.empty()) {