fix(adc): rename ADC_ATTEN_DB_11 to ADC_ATTEN_DB_12

By design, it's 12 dB. There're errors among chips, so the actual
attenuation will be 11dB more or less

components/driver/adc_deprecated.c

@@ -60,7 +60,7 @@ esp_pm_lock_handle_t adc_digi_arbiter_lock = NULL;
 #define ADC_MEAS_NUM_LIM_DEFAULT      (1)
 #define ADC_MAX_MEAS_NUM_DEFAULT      (255)
 #define DIG_ADC_OUTPUT_FORMAT_DEFUALT (ADC_DIGI_FORMAT_12BIT)
-#define DIG_ADC_ATTEN_DEFUALT         (ADC_ATTEN_DB_11)
+#define DIG_ADC_ATTEN_DEFUALT         (ADC_ATTEN_DB_12)
 #define DIG_ADC_BIT_WIDTH_DEFUALT     (ADC_WIDTH_BIT_12)
 
 esp_err_t adc_digi_init(void)

components/driver/esp32c3/adc2_init_cal.c

@@ -19,7 +19,7 @@ Don't put any other code into this file. */
 static __attribute__((constructor)) void adc2_init_code_calibration(void)
 {
     const adc_ll_num_t adc_n = ADC_NUM_2;
-    const adc_atten_t atten = ADC_ATTEN_DB_11;
+    const adc_atten_t atten = ADC_ATTEN_DB_12;
     const adc_channel_t channel = 0;
     adc_cal_offset(adc_n, channel, atten);
 }

components/driver/esp32s2/adc2_init_cal.c

@@ -19,7 +19,7 @@ Don't put any other code into this file. */
 static __attribute__((constructor)) void adc2_init_code_calibration(void)
 {
     const adc_ll_num_t adc_n = ADC_NUM_2;
-    const adc_atten_t atten = ADC_ATTEN_DB_11;
+    const adc_atten_t atten = ADC_ATTEN_DB_12;
     const adc_channel_t channel = 0;
     adc_cal_offset(adc_n, channel, atten);
 }

components/driver/include/driver/adc.h

@@ -89,7 +89,7 @@ typedef enum {
 #define ADC_ATTEN_0db   ADC_ATTEN_DB_0
 #define ADC_ATTEN_2_5db ADC_ATTEN_DB_2_5
 #define ADC_ATTEN_6db   ADC_ATTEN_DB_6
-#define ADC_ATTEN_11db  ADC_ATTEN_DB_11
+#define ADC_ATTEN_11db  ADC_ATTEN_DB_12
 
 /**
  * The default (max) bit width of the ADC of current version. You can also get the maximum bitwidth

components/driver/test/test_adc.c

@@ -161,7 +161,7 @@ TEST_CASE("test_adc_dma", "[adc][ignore][manual]")
     bool print_figure;
     if (target_atten == ADC_ATTEN_MAX) {
         atten = ADC_ATTEN_DB_0;
-        target_atten = ADC_ATTEN_DB_11;
+        target_atten = ADC_ATTEN_DB_12;
         print_figure = false;
     } else {
         atten = target_atten;
@@ -228,7 +228,7 @@ TEST_CASE("test_adc_single", "[adc][ignore][manual]")
     bool print_figure;
     if (target_atten == ADC_ATTEN_MAX) {
         atten = ADC_ATTEN_DB_0;
-        target_atten = ADC_ATTEN_DB_11;
+        target_atten = ADC_ATTEN_DB_12;
         print_figure = false;
     } else {
         atten = target_atten;

components/driver/test/test_adc2_with_wifi.c

@@ -236,7 +236,7 @@ static void i2s_adc_init(void)
     i2s_driver_install(I2S_NUM_0, &i2s_config, 0, NULL);
     // init ADC pad
     i2s_set_adc_mode(ADC_UNIT_1, ADC1_CHANNEL_4);
-    // enable adc sampling, ADC_WIDTH_BIT_12, ADC_ATTEN_DB_11 hard-coded in adc_i2s_mode_init
+    // enable adc sampling, ADC_WIDTH_BIT_12, ADC_ATTEN_DB_12 hard-coded in adc_i2s_mode_init
     i2s_adc_enable(I2S_NUM_0);
 }
 

components/driver/test/test_adc_common.c

@@ -32,8 +32,8 @@ static const char *TAG = "test_adc";
 #define ADC2_TEST_WIDTH         ADC_WIDTH_BIT_13   //ESP32S2 only support 13 bit width
 #endif
 
-#define ADC1_TEST_ATTEN         ADC_ATTEN_DB_11
-#define ADC2_TEST_ATTEN         ADC_ATTEN_DB_11
+#define ADC1_TEST_ATTEN         ADC_ATTEN_DB_12
+#define ADC2_TEST_ATTEN         ADC_ATTEN_DB_12
 
 #if CONFIG_IDF_TARGET_ESP32
 #define ADC1_TEST_CHANNEL_NUM   8

components/driver/test/test_dac.c

@@ -30,7 +30,7 @@ static const char *TAG = "test_dac";
 #elif defined CONFIG_IDF_TARGET_ESP32S2
 #define ADC_TEST_WIDTH         ADC_WIDTH_BIT_13   //ESP32S2 only support 13 bit width
 #endif
-#define ADC_TEST_ATTEN         ADC_ATTEN_DB_11
+#define ADC_TEST_ATTEN         ADC_ATTEN_DB_12
 
 #if CONFIG_IDF_TARGET_ESP32
 #define ADC_TEST_CHANNEL_NUM   ADC2_CHANNEL_8   // GPIO25
@@ -180,8 +180,8 @@ TEST_CASE("esp32s2 adc2-dac with adc2 calibration", "[adc-dac]")
     subtest_adc_dac(1250, &chars);
 
     printf("Test 11dB atten...\n");
-    adc2_config_channel_atten((adc2_channel_t)ADC_TEST_CHANNEL_NUM, ADC_ATTEN_DB_11);
-    esp_adc_cal_characterize(ADC_UNIT_2, ADC_ATTEN_DB_11, ADC_WIDTH_BIT_13, 0, &chars);
+    adc2_config_channel_atten((adc2_channel_t)ADC_TEST_CHANNEL_NUM, ADC_ATTEN_DB_12);
+    esp_adc_cal_characterize(ADC_UNIT_2, ADC_ATTEN_DB_12, ADC_WIDTH_BIT_13, 0, &chars);
     printf("a %d, b %d\n", chars.coeff_a, chars.coeff_b);
     subtest_adc_dac(1500, &chars);
     subtest_adc_dac(2500, &chars);

components/driver/test/test_i2s.c

@@ -769,7 +769,7 @@ TEST_CASE("I2S adc test", "[i2s]")
     i2s_driver_install(I2S_NUM_0, &i2s_config, 0, NULL);
     // init ADC pad
     i2s_set_adc_mode(ADC_UNIT_1, ADC1_CHANNEL_4);
-    // enable adc sampling, ADC_WIDTH_BIT_12, ADC_ATTEN_DB_11 hard-coded in adc_i2s_mode_init
+    // enable adc sampling, ADC_WIDTH_BIT_12, ADC_ATTEN_DB_12 hard-coded in adc_i2s_mode_init
     i2s_adc_enable(I2S_NUM_0);
     // init read buffer
     uint16_t *i2sReadBuffer = (uint16_t *)calloc(1024, sizeof(uint16_t));

components/esp_adc_cal/esp32/esp_adc_cal.c

@@ -319,7 +319,7 @@ esp_adc_cal_value_t esp_adc_cal_characterize(adc_unit_t adc_num,
     chars->bit_width = bit_width;
     chars->vref = (EFUSE_VREF_ENABLED && efuse_vref_present) ? read_efuse_vref() : default_vref;
     //Initialize fields for lookup table if necessary
-    if (LUT_ENABLED && atten == ADC_ATTEN_DB_11) {
+    if (LUT_ENABLED && atten == ADC_ATTEN_DB_12) {
         chars->low_curve = (adc_num == ADC_UNIT_1) ? lut_adc1_low : lut_adc2_low;
         chars->high_curve = (adc_num == ADC_UNIT_1) ? lut_adc1_high : lut_adc2_high;
     } else {
@@ -339,8 +339,8 @@ uint32_t esp_adc_cal_raw_to_voltage(uint32_t adc_reading, const esp_adc_cal_char
         adc_reading = ADC_12_BIT_RES - 1;    //Set to 12bit res max
     }
 
-    if (LUT_ENABLED && (chars->atten == ADC_ATTEN_DB_11) && (adc_reading >= LUT_LOW_THRESH)) {  //Check if in non-linear region
-        //Use lookup table to get voltage in non linear portion of ADC_ATTEN_DB_11
+    if (LUT_ENABLED && (chars->atten == ADC_ATTEN_DB_12) && (adc_reading >= LUT_LOW_THRESH)) {  //Check if in non-linear region
+        //Use lookup table to get voltage in non linear portion of ADC_ATTEN_DB_12
         uint32_t lut_voltage = calculate_voltage_lut(adc_reading, chars->vref, chars->low_curve, chars->high_curve);
         if (adc_reading <= LUT_HIGH_THRESH) {   //If ADC is transitioning from linear region to non-linear region
             //Linearly interpolate between linear voltage and lut voltage

components/esp_adc_cal/esp32s2/esp_adc_cal.c

@@ -74,7 +74,7 @@ static bool prepare_calib_data_for(adc_unit_t adc_num, adc_atten_t atten, adc_ca
         case ADC_ATTEN_DB_6:
             parsed_data_storage->efuse_data.ver2.adc_calib_high_voltage = 1000;
             break;
-        case ADC_ATTEN_DB_11:
+        case ADC_ATTEN_DB_12:
             parsed_data_storage->efuse_data.ver2.adc_calib_high_voltage = 2000;
             break;
         default:

components/hal/esp32s2/include/hal/adc_ll.h

@@ -799,19 +799,19 @@ static inline adc_ll_rtc_raw_data_t adc_ll_rtc_analysis_raw_data(adc_ll_num_t ad
  * - 0dB attenuaton (ADC_ATTEN_DB_0) gives full-scale voltage 1.1V
  * - 2.5dB attenuation (ADC_ATTEN_DB_2_5) gives full-scale voltage 1.5V
  * - 6dB attenuation (ADC_ATTEN_DB_6) gives full-scale voltage 2.2V
- * - 11dB attenuation (ADC_ATTEN_DB_11) gives full-scale voltage 3.9V (see note below)
+ * - 12dB attenuation (ADC_ATTEN_DB_12) gives full-scale voltage 3.9V (see note below)
  *
  * @note The full-scale voltage is the voltage corresponding to a maximum reading (depending on ADC1 configured
  * bit width, this value is: 4095 for 12-bits, 2047 for 11-bits, 1023 for 10-bits, 511 for 9 bits.)
  *
- * @note At 11dB attenuation the maximum voltage is limited by VDD_A, not the full scale voltage.
+ * @note At 12dB attenuation the maximum voltage is limited by VDD_A, not the full scale voltage.
  *
  * Due to ADC characteristics, most accurate results are obtained within the following approximate voltage ranges:
  *
  * - 0dB attenuaton (ADC_ATTEN_DB_0) between 100 and 950mV
  * - 2.5dB attenuation (ADC_ATTEN_DB_2_5) between 100 and 1250mV
  * - 6dB attenuation (ADC_ATTEN_DB_6) between 150 to 1750mV
- * - 11dB attenuation (ADC_ATTEN_DB_11) between 150 to 2450mV
+ * - 12dB attenuation (ADC_ATTEN_DB_12) between 150 to 2450mV
  *
  * For maximum accuracy, use the ADC calibration APIs and measure voltages within these recommended ranges.
  *

components/hal/esp32s3/include/hal/adc_ll.h

@@ -1011,19 +1011,19 @@ static inline adc_ll_rtc_raw_data_t adc_ll_rtc_analysis_raw_data(adc_ll_num_t ad
  * - 0dB attenuaton (ADC_ATTEN_DB_0) gives full-scale voltage 1.1V
  * - 2.5dB attenuation (ADC_ATTEN_DB_2_5) gives full-scale voltage 1.5V
  * - 6dB attenuation (ADC_ATTEN_DB_6) gives full-scale voltage 2.2V
- * - 11dB attenuation (ADC_ATTEN_DB_11) gives full-scale voltage 3.9V (see note below)
+ * - 12dB attenuation (ADC_ATTEN_DB_12) gives full-scale voltage 3.9V (see note below)
  *
  * @note The full-scale voltage is the voltage corresponding to a maximum reading (depending on ADC1 configured
  * bit width, this value is: 4095 for 12-bits, 2047 for 11-bits, 1023 for 10-bits, 511 for 9 bits.)
  *
- * @note At 11dB attenuation the maximum voltage is limited by VDD_A, not the full scale voltage.
+ * @note At 12dB attenuation the maximum voltage is limited by VDD_A, not the full scale voltage.
  *
  * Due to ADC characteristics, most accurate results are obtained within the following approximate voltage ranges:
  *
  * - 0dB attenuaton (ADC_ATTEN_DB_0) between 100 and 950mV
  * - 2.5dB attenuation (ADC_ATTEN_DB_2_5) between 100 and 1250mV
  * - 6dB attenuation (ADC_ATTEN_DB_6) between 150 to 1750mV
- * - 11dB attenuation (ADC_ATTEN_DB_11) between 150 to 2450mV
+ * - 12dB attenuation (ADC_ATTEN_DB_12) between 150 to 2450mV
  *
  * For maximum accuracy, use the ADC calibration APIs and measure voltages within these recommended ranges.
  *

components/hal/include/hal/adc_hal.h

@@ -267,7 +267,7 @@ void adc_hal_digi_stop(adc_hal_context_t *hal);
  * - 0dB attenuaton (ADC_ATTEN_DB_0) gives full-scale voltage 1.1V
  * - 2.5dB attenuation (ADC_ATTEN_DB_2_5) gives full-scale voltage 1.5V
  * - 6dB attenuation (ADC_ATTEN_DB_6) gives full-scale voltage 2.2V
- * - 11dB attenuation (ADC_ATTEN_DB_11) gives full-scale voltage 3.9V (see note below)
+ * - 11dB attenuation (ADC_ATTEN_DB_12) gives full-scale voltage 3.9V (see note below)
  *
  * @note The full-scale voltage is the voltage corresponding to a maximum reading (depending on ADC1 configured
  * bit width, this value is: 4095 for 12-bits, 2047 for 11-bits, 1023 for 10-bits, 511 for 9 bits.)
@@ -279,7 +279,7 @@ void adc_hal_digi_stop(adc_hal_context_t *hal);
  * - 0dB attenuaton (ADC_ATTEN_DB_0) between 100 and 950mV
  * - 2.5dB attenuation (ADC_ATTEN_DB_2_5) between 100 and 1250mV
  * - 6dB attenuation (ADC_ATTEN_DB_6) between 150 to 1750mV
- * - 11dB attenuation (ADC_ATTEN_DB_11) between 150 to 2450mV
+ * - 11dB attenuation (ADC_ATTEN_DB_12) between 150 to 2450mV
  *
  * For maximum accuracy, use the ADC calibration APIs and measure voltages within these recommended ranges.
  *

components/hal/include/hal/adc_types.h

@@ -47,10 +47,11 @@ typedef enum {
  * @brief ADC attenuation parameter. Different parameters determine the range of the ADC. See ``adc1_config_channel_atten``.
  */
 typedef enum {
-    ADC_ATTEN_DB_0   = 0,  /*!<No input attenumation, ADC can measure up to approx. 800 mV. */
-    ADC_ATTEN_DB_2_5 = 1,  /*!<The input voltage of ADC will be attenuated extending the range of measurement by about 2.5 dB (1.33 x) */
-    ADC_ATTEN_DB_6   = 2,  /*!<The input voltage of ADC will be attenuated extending the range of measurement by about 6 dB (2 x) */
-    ADC_ATTEN_DB_11  = 3,  /*!<The input voltage of ADC will be attenuated extending the range of measurement by about 11 dB (3.55 x) */
+    ADC_ATTEN_DB_0   = 0,  ///<No input attenuation, ADC can measure up to approx.
+    ADC_ATTEN_DB_2_5 = 1,  ///<The input voltage of ADC will be attenuated extending the range of measurement by about 2.5 dB
+    ADC_ATTEN_DB_6   = 2,  ///<The input voltage of ADC will be attenuated extending the range of measurement by about 6 dB
+    ADC_ATTEN_DB_12  = 3,  ///<The input voltage of ADC will be attenuated extending the range of measurement by about 12 dB
+    ADC_ATTEN_DB_11 __attribute__((deprecated)) = ADC_ATTEN_DB_12,  ///<This is deprecated, it behaves the same as `ADC_ATTEN_DB_12`
     ADC_ATTEN_MAX,
 } adc_atten_t;
 

docs/en/api-reference/peripherals/adc.rst

@@ -62,7 +62,7 @@ Attenuation            Measurable input voltage range
 ``ADC_ATTEN_DB_0``     {IDF_TARGET_ADC_V_MIN_ATTEN0} mV ~ {IDF_TARGET_ADC_V_MAX_ATTEN0} mV
 ``ADC_ATTEN_DB_2_5``   {IDF_TARGET_ADC_V_MIN_ATTEN1} mV ~ {IDF_TARGET_ADC_V_MAX_ATTEN1} mV
 ``ADC_ATTEN_DB_6``     {IDF_TARGET_ADC_V_MIN_ATTEN2} mV ~ {IDF_TARGET_ADC_V_MAX_ATTEN2} mV
-``ADC_ATTEN_DB_11``    {IDF_TARGET_ADC_V_MIN_ATTEN3} mV ~ {IDF_TARGET_ADC_V_MAX_ATTEN3} mV
+``ADC_ATTEN_DB_12``    {IDF_TARGET_ADC_V_MIN_ATTEN3} mV ~ {IDF_TARGET_ADC_V_MAX_ATTEN3} mV
 =====================  =========================================================================================================
 
 

examples/peripherals/adc/single_read/single_read/main/single_read.c

@@ -33,7 +33,7 @@ static const char *TAG_CH[2][10] = {{"ADC1_CH2"}, {"ADC2_CH0"}};
 #endif
 
 //ADC Attenuation
-#define ADC_EXAMPLE_ATTEN           ADC_ATTEN_DB_11
+#define ADC_EXAMPLE_ATTEN           ADC_ATTEN_DB_12
 
 //ADC Calibration
 #if CONFIG_IDF_TARGET_ESP32

examples/peripherals/i2s/i2s_adc_dac/main/app_main.c

@@ -274,7 +274,7 @@ void adc_read_task(void* arg)
     adc1_config_width(ADC_WIDTH_12Bit);
     adc1_config_channel_atten(ADC1_TEST_CHANNEL, ADC_ATTEN_11db);
     esp_adc_cal_characteristics_t characteristics;
-    esp_adc_cal_characterize(ADC_UNIT_1, ADC_ATTEN_DB_11, ADC_WIDTH_BIT_12, V_REF, &characteristics);
+    esp_adc_cal_characterize(ADC_UNIT_1, ADC_ATTEN_DB_12, ADC_WIDTH_BIT_12, V_REF, &characteristics);
     while(1) {
         uint32_t voltage;
         esp_adc_cal_get_voltage(ADC1_TEST_CHANNEL, &characteristics, &voltage);

examples/system/app_trace_to_host/main/app_trace_to_host_example_main.c

@@ -96,7 +96,7 @@ void app_main(void)
 #elif CONFIG_IDF_TARGET_ESP32S2
     adc1_config_width(ADC_WIDTH_BIT_13);
 #endif
-    adc1_config_channel_atten(ADC1_TEST_CHANNEL, ADC_ATTEN_DB_11);
+    adc1_config_channel_atten(ADC1_TEST_CHANNEL, ADC_ATTEN_DB_12);
 
     ESP_LOGI(TAG, "Enabling CW generator on DAC channel 1 / GPIO%d.", DAC_CHANNEL_1_GPIO_NUM);
     enable_cosine_generator();

examples/system/ulp_fsm/ulp_adc/main/ulp_adc_example_main.c

@@ -63,7 +63,7 @@ static void init_ulp_program(void)
     /* Configure ADC channel */
     /* Note: when changing channel here, also change 'adc_channel' constant
        in adc.S */
-    adc1_config_channel_atten(ADC1_CHANNEL_6, ADC_ATTEN_DB_11);
+    adc1_config_channel_atten(ADC1_CHANNEL_6, ADC_ATTEN_DB_12);
 #if CONFIG_IDF_TARGET_ESP32
     adc1_config_width(ADC_WIDTH_BIT_12);
 #elif CONFIG_IDF_TARGET_ESP32S2

examples/system/ulp_riscv/adc/main/ulp/example_config.h

@@ -8,7 +8,7 @@
 #include "hal/adc_types.h"
 
 #define EXAMPLE_ADC_CHANNEL     ADC_CHANNEL_0
-#define EXAMPLE_ADC_ATTEN       ADC_ATTEN_DB_11
+#define EXAMPLE_ADC_ATTEN       ADC_ATTEN_DB_12
 #define EXAMPLE_ADC_WIDTH       ADC_WIDTH_BIT_12
 
 /* Set high threshold, approx. 1.75V*/