diff --git a/components/hal/adc_oneshot_hal.c b/components/hal/adc_oneshot_hal.c
index 096fbcfb89..b9cfdcbe8f 100644
--- a/components/hal/adc_oneshot_hal.c
+++ b/components/hal/adc_oneshot_hal.c
@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2019-2024 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2019-2025 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -113,9 +113,11 @@ static void adc_hal_onetime_start(adc_unit_t unit, uint32_t clk_src_freq_hz, uin
     }
 
     HAL_EARLY_LOGD("adc_hal", "delay for `onetime_start` signal captured: %"PRIu32"", sample_delay_us);
+
+    adc_oneshot_ll_start(true);
+    esp_rom_delay_us(sample_delay_us);
     adc_oneshot_ll_start(false);
     esp_rom_delay_us(sample_delay_us);
-    adc_oneshot_ll_start(true);
 
 #if ADC_LL_DELAY_CYCLE_AFTER_DONE_SIGNAL
     /**
@@ -145,7 +147,6 @@ bool adc_oneshot_hal_convert(adc_oneshot_hal_ctx_t *hal, int *out_raw)
     }
 
     adc_oneshot_ll_clear_event(event);
-    adc_oneshot_ll_disable_all_unit();
     adc_oneshot_ll_enable(hal->unit);
 
     adc_hal_onetime_start(hal->unit, hal->clk_src_freq_hz, &read_delay_us);
diff --git a/components/hal/esp32c6/include/hal/adc_ll.h b/components/hal/esp32c6/include/hal/adc_ll.h
index 92af7fc0da..011b47f7da 100644
--- a/components/hal/esp32c6/include/hal/adc_ll.h
+++ b/components/hal/esp32c6/include/hal/adc_ll.h
@@ -8,6 +8,7 @@
 #include <stdbool.h>
 #include <stdlib.h>
 #include "esp_attr.h"
+#include "esp_rom_sys.h"
 
 #include "soc/adc_periph.h"
 #include "soc/apb_saradc_struct.h"
@@ -806,7 +807,11 @@ static inline void adc_oneshot_ll_output_invert(adc_unit_t adc_n, bool inv_en)
 static inline void adc_oneshot_ll_enable(adc_unit_t adc_n)
 {
     HAL_ASSERT(adc_n == ADC_UNIT_1);
-    APB_SARADC.saradc_onetime_sample.saradc_saradc1_onetime_sample = 1;
+    // For ESP32C6, it need to delay 50us after enable oneshot mode to ensure the ADC channel select is stable.
+    if (APB_SARADC.saradc_onetime_sample.saradc_saradc1_onetime_sample == 0) {
+        APB_SARADC.saradc_onetime_sample.saradc_saradc1_onetime_sample = 1;
+        esp_rom_delay_us(50);
+    }
 }
 
 /**
@@ -814,8 +819,7 @@ static inline void adc_oneshot_ll_enable(adc_unit_t adc_n)
  */
 static inline void adc_oneshot_ll_disable_all_unit(void)
 {
-    APB_SARADC.saradc_onetime_sample.saradc_saradc1_onetime_sample = 0;
-    APB_SARADC.saradc_onetime_sample.saradc_saradc2_onetime_sample = 0;
+    // For ESP32C6, we keep saradc_saradc1_onetime_sample as 1 when oneshot mode.
 }
 
 /**