toitware · floitsch · May 20, 2026 · May 22, 2025
diff --git a/components/driver/deprecated/rmt_legacy.c b/components/driver/deprecated/rmt_legacy.c
@@ -302,7 +302,7 @@ esp_err_t rmt_tx_stop(rmt_channel_t channel)
 {
     ESP_RETURN_ON_FALSE(RMT_IS_TX_CHANNEL(channel), ESP_ERR_INVALID_ARG, TAG, RMT_CHANNEL_ERROR_STR);
     RMT_ENTER_CRITICAL();
-#if SOC_RMT_SUPPORT_TX_ASYNC_STOP
+#if SOC_RMT_SUPPORT_ASYNC_STOP
     rmt_ll_tx_stop(rmt_contex.hal.regs, channel);
 #else
     // write ending marker to stop the TX channel

diff --git a/components/esp_driver_rmt/src/rmt_rx.c b/components/esp_driver_rmt/src/rmt_rx.c
@@ -598,6 +598,16 @@ static bool IRAM_ATTR rmt_isr_handle_rx_done(rmt_rx_channel_t *rx_chan)
     rmt_ll_rx_enable(hal->regs, channel_id, false);
     portEXIT_CRITICAL_ISR(&channel->spinlock);
 
+#if !SOC_RMT_SUPPORT_ASYNC_STOP
+    // This is a workaround for ESP32.
+    // The RX engine can not be disabled once it is enabled in ESP32
+    // If the state isn't RMT_FSM_RUN, it means the RX engine was disabled
+    // and we shouldn't process the data.
+    if (atomic_load(&channel->fsm) != RMT_FSM_RUN) {
+        return false;
+    }
+#endif
+
     uint32_t offset = rmt_ll_rx_get_memory_writer_offset(hal->regs, channel_id);
 
     // Start from C6, the actual pulse count is the number of input pulses N - 1.

diff --git a/components/esp_driver_rmt/src/rmt_tx.c b/components/esp_driver_rmt/src/rmt_tx.c
@@ -831,14 +831,14 @@ static esp_err_t rmt_tx_disable(rmt_channel_handle_t channel)
         // disable the hardware
         portENTER_CRITICAL(&channel->spinlock);
         rmt_ll_tx_enable_loop(hal->regs, channel->channel_id, false);
-#if SOC_RMT_SUPPORT_TX_ASYNC_STOP
+#if SOC_RMT_SUPPORT_ASYNC_STOP
         rmt_ll_tx_stop(hal->regs, channel->channel_id);
 #endif
         portEXIT_CRITICAL(&channel->spinlock);
 
         portENTER_CRITICAL(&group->spinlock);
         rmt_ll_enable_interrupt(hal->regs, RMT_LL_EVENT_TX_MASK(channel_id), false);
-#if !SOC_RMT_SUPPORT_TX_ASYNC_STOP
+#if !SOC_RMT_SUPPORT_ASYNC_STOP
         // we do a trick to stop the undergoing transmission
         // stop interrupt, insert EOF marker to the RMT memory, polling the trans_done event
         channel->hw_mem_base[0].val = 0;

diff --git a/components/soc/esp32c3/include/soc/Kconfig.soc_caps.in b/components/soc/esp32c3/include/soc/Kconfig.soc_caps.in
@@ -599,7 +599,7 @@ config SOC_RMT_SUPPORT_RX_DEMODULATION
     bool
     default y
 
-config SOC_RMT_SUPPORT_TX_ASYNC_STOP
+config SOC_RMT_SUPPORT_ASYNC_STOP
     bool
     default y
 

diff --git a/components/soc/esp32c3/include/soc/soc_caps.h b/components/soc/esp32c3/include/soc/soc_caps.h
@@ -247,7 +247,7 @@
 #define SOC_RMT_MEM_WORDS_PER_CHANNEL         48 /*!< Each channel owns 48 words memory (1 word = 4 Bytes) */
 #define SOC_RMT_SUPPORT_RX_PINGPONG           1  /*!< Support Ping-Pong mode on RX path */
 #define SOC_RMT_SUPPORT_RX_DEMODULATION       1  /*!< Support signal demodulation on RX path (i.e. remove carrier) */
-#define SOC_RMT_SUPPORT_TX_ASYNC_STOP         1  /*!< Support stop transmission asynchronously */
+#define SOC_RMT_SUPPORT_ASYNC_STOP            1  /*!< Support stop transmission asynchronously */
 #define SOC_RMT_SUPPORT_TX_LOOP_COUNT         1  /*!< Support transmit specified number of cycles in loop mode */
 #define SOC_RMT_SUPPORT_TX_SYNCHRO            1  /*!< Support coordinate a group of TX channels to start simultaneously */
 #define SOC_RMT_SUPPORT_TX_CARRIER_DATA_ONLY  1  /*!< TX carrier can be modulated to data phase only */

diff --git a/components/soc/esp32c5/include/soc/Kconfig.soc_caps.in b/components/soc/esp32c5/include/soc/Kconfig.soc_caps.in
@@ -815,7 +815,7 @@ config SOC_RMT_SUPPORT_RX_DEMODULATION
     bool
     default y
 
-config SOC_RMT_SUPPORT_TX_ASYNC_STOP
+config SOC_RMT_SUPPORT_ASYNC_STOP
     bool
     default y
 

diff --git a/components/soc/esp32c5/include/soc/soc_caps.h b/components/soc/esp32c5/include/soc/soc_caps.h
@@ -336,7 +336,7 @@
 #define SOC_RMT_MEM_WORDS_PER_CHANNEL         48 /*!< Each channel owns 48 words memory (1 word = 4 Bytes) */
 #define SOC_RMT_SUPPORT_RX_PINGPONG           1  /*!< Support Ping-Pong mode on RX path */
 #define SOC_RMT_SUPPORT_RX_DEMODULATION       1  /*!< Support signal demodulation on RX path (i.e. remove carrier) */
-#define SOC_RMT_SUPPORT_TX_ASYNC_STOP         1  /*!< Support stop transmission asynchronously */
+#define SOC_RMT_SUPPORT_ASYNC_STOP            1  /*!< Support stop transmission asynchronously */
 #define SOC_RMT_SUPPORT_TX_LOOP_COUNT         1  /*!< Support transmit specified number of cycles in loop mode */
 #define SOC_RMT_SUPPORT_TX_LOOP_AUTO_STOP     1  /*!< Hardware support of auto-stop in loop mode */
 #define SOC_RMT_SUPPORT_TX_SYNCHRO            1  /*!< Support coordinate a group of TX channels to start simultaneously */

diff --git a/components/soc/esp32c6/include/soc/Kconfig.soc_caps.in b/components/soc/esp32c6/include/soc/Kconfig.soc_caps.in
@@ -819,7 +819,7 @@ config SOC_RMT_SUPPORT_RX_DEMODULATION
     bool
     default y
 
-config SOC_RMT_SUPPORT_TX_ASYNC_STOP
+config SOC_RMT_SUPPORT_ASYNC_STOP
     bool
     default y
 

diff --git a/components/soc/esp32c6/include/soc/soc_caps.h b/components/soc/esp32c6/include/soc/soc_caps.h
@@ -320,7 +320,7 @@
 #define SOC_RMT_MEM_WORDS_PER_CHANNEL         48 /*!< Each channel owns 48 words memory (1 word = 4 Bytes) */
 #define SOC_RMT_SUPPORT_RX_PINGPONG           1  /*!< Support Ping-Pong mode on RX path */
 #define SOC_RMT_SUPPORT_RX_DEMODULATION       1  /*!< Support signal demodulation on RX path (i.e. remove carrier) */
-#define SOC_RMT_SUPPORT_TX_ASYNC_STOP         1  /*!< Support stop transmission asynchronously */
+#define SOC_RMT_SUPPORT_ASYNC_STOP            1  /*!< Support stop transmission asynchronously */
 #define SOC_RMT_SUPPORT_TX_LOOP_COUNT         1  /*!< Support transmit specified number of cycles in loop mode */
 #define SOC_RMT_SUPPORT_TX_LOOP_AUTO_STOP     1  /*!< Hardware support of auto-stop in loop mode */
 #define SOC_RMT_SUPPORT_TX_SYNCHRO            1  /*!< Support coordinate a group of TX channels to start simultaneously */

diff --git a/components/soc/esp32h2/include/soc/Kconfig.soc_caps.in b/components/soc/esp32h2/include/soc/Kconfig.soc_caps.in
@@ -811,7 +811,7 @@ config SOC_RMT_SUPPORT_RX_DEMODULATION
     bool
     default y
 
-config SOC_RMT_SUPPORT_TX_ASYNC_STOP
+config SOC_RMT_SUPPORT_ASYNC_STOP
     bool
     default y
 

diff --git a/components/soc/esp32h2/include/soc/soc_caps.h b/components/soc/esp32h2/include/soc/soc_caps.h
@@ -333,7 +333,7 @@
 #define SOC_RMT_MEM_WORDS_PER_CHANNEL         48 /*!< Each channel owns 48 words memory (1 word = 4 Bytes) */
 #define SOC_RMT_SUPPORT_RX_PINGPONG           1  /*!< Support Ping-Pong mode on RX path */
 #define SOC_RMT_SUPPORT_RX_DEMODULATION       1  /*!< Support signal demodulation on RX path (i.e. remove carrier) */
-#define SOC_RMT_SUPPORT_TX_ASYNC_STOP         1  /*!< Support stop transmission asynchronously */
+#define SOC_RMT_SUPPORT_ASYNC_STOP            1  /*!< Support stop transmission asynchronously */
 #define SOC_RMT_SUPPORT_TX_LOOP_COUNT         1  /*!< Support transmit specified number of cycles in loop mode */
 #define SOC_RMT_SUPPORT_TX_LOOP_AUTO_STOP     1  /*!< Hardware support of auto-stop in loop mode */
 #define SOC_RMT_SUPPORT_TX_SYNCHRO            1  /*!< Support coordinate a group of TX channels to start simultaneously */

diff --git a/components/soc/esp32p4/include/soc/Kconfig.soc_caps.in b/components/soc/esp32p4/include/soc/Kconfig.soc_caps.in
@@ -1179,7 +1179,7 @@ config SOC_RMT_SUPPORT_RX_DEMODULATION
     bool
     default y
 
-config SOC_RMT_SUPPORT_TX_ASYNC_STOP
+config SOC_RMT_SUPPORT_ASYNC_STOP
     bool
     default y
 

diff --git a/components/soc/esp32p4/include/soc/soc_caps.h b/components/soc/esp32p4/include/soc/soc_caps.h
@@ -425,7 +425,7 @@
 #define SOC_RMT_MEM_WORDS_PER_CHANNEL         48 /*!< Each channel owns 48 words memory (1 word = 4 Bytes) */
 #define SOC_RMT_SUPPORT_RX_PINGPONG           1  /*!< Support Ping-Pong mode on RX path */
 #define SOC_RMT_SUPPORT_RX_DEMODULATION       1  /*!< Support signal demodulation on RX path (i.e. remove carrier) */
-#define SOC_RMT_SUPPORT_TX_ASYNC_STOP         1  /*!< Support stop transmission asynchronously */
+#define SOC_RMT_SUPPORT_ASYNC_STOP            1  /*!< Support stop transmission asynchronously */
 #define SOC_RMT_SUPPORT_TX_LOOP_COUNT         1  /*!< Support transmit specified number of cycles in loop mode */
 #define SOC_RMT_SUPPORT_TX_LOOP_AUTO_STOP     1  /*!< Hardware support of auto-stop in loop mode */
 #define SOC_RMT_SUPPORT_TX_SYNCHRO            1  /*!< Support coordinate a group of TX channels to start simultaneously */

diff --git a/components/soc/esp32s2/include/soc/Kconfig.soc_caps.in b/components/soc/esp32s2/include/soc/Kconfig.soc_caps.in
@@ -623,7 +623,7 @@ config SOC_RMT_SUPPORT_RX_DEMODULATION
     bool
     default y
 
-config SOC_RMT_SUPPORT_TX_ASYNC_STOP
+config SOC_RMT_SUPPORT_ASYNC_STOP
     bool
     default y
 

diff --git a/components/soc/esp32s2/include/soc/soc_caps.h b/components/soc/esp32s2/include/soc/soc_caps.h
@@ -264,7 +264,7 @@
 #define SOC_RMT_CHANNELS_PER_GROUP            4  /*!< Total 4 channels */
 #define SOC_RMT_MEM_WORDS_PER_CHANNEL         64 /*!< Each channel owns 64 words memory (1 word = 4 Bytes) */
 #define SOC_RMT_SUPPORT_RX_DEMODULATION       1  /*!< Support signal demodulation on RX path (i.e. remove carrier) */
-#define SOC_RMT_SUPPORT_TX_ASYNC_STOP         1  /*!< Support stop transmission asynchronously */
+#define SOC_RMT_SUPPORT_ASYNC_STOP            1  /*!< Support stop transmission asynchronously */
 #define SOC_RMT_SUPPORT_TX_LOOP_COUNT         1  /*!< Support transmitting specified number of cycles in loop mode */
 #define SOC_RMT_SUPPORT_TX_SYNCHRO            1  /*!< Support coordinate a group of TX channels to start simultaneously */
 #define SOC_RMT_SUPPORT_TX_CARRIER_DATA_ONLY  1  /*!< TX carrier can be modulated to data phase only */

diff --git a/components/soc/esp32s3/include/soc/Kconfig.soc_caps.in b/components/soc/esp32s3/include/soc/Kconfig.soc_caps.in
@@ -727,7 +727,7 @@ config SOC_RMT_SUPPORT_RX_DEMODULATION
     bool
     default y
 
-config SOC_RMT_SUPPORT_TX_ASYNC_STOP
+config SOC_RMT_SUPPORT_ASYNC_STOP
     bool
     default y
 

diff --git a/components/soc/esp32s3/include/soc/soc_caps.h b/components/soc/esp32s3/include/soc/soc_caps.h
@@ -279,7 +279,7 @@
 #define SOC_RMT_MEM_WORDS_PER_CHANNEL         48 /*!< Each channel owns 48 words memory (1 word = 4 Bytes) */
 #define SOC_RMT_SUPPORT_RX_PINGPONG           1  /*!< Support Ping-Pong mode on RX path */
 #define SOC_RMT_SUPPORT_RX_DEMODULATION       1  /*!< Support signal demodulation on RX path (i.e. remove carrier) */
-#define SOC_RMT_SUPPORT_TX_ASYNC_STOP         1  /*!< Support stop transmission asynchronously */
+#define SOC_RMT_SUPPORT_ASYNC_STOP            1  /*!< Support stop transmission asynchronously */
 #define SOC_RMT_SUPPORT_TX_LOOP_COUNT         1  /*!< Support transmit specified number of cycles in loop mode */
 #define SOC_RMT_SUPPORT_TX_LOOP_AUTO_STOP     1  /*!< Hardware support of auto-stop in loop mode */
 #define SOC_RMT_SUPPORT_TX_SYNCHRO            1  /*!< Support coordinate a group of TX channels to start simultaneously */