Fix analogWidth for ESP32S2 in esp32-hal-adc.c (espressif#5711)

Author: caternuson

Diff for: cores/esp32/esp32-hal-adc.c

@@ -37,7 +37,7 @@ static uint8_t __analogVRefPin = 0;
 #include "soc/rtc_io_reg.h"
 #elif CONFIG_IDF_TARGET_ESP32C3
 #include "esp32c3/rom/ets_sys.h"
-#else 
+#else
 #error Target CONFIG_IDF_TARGET is not supported
 #endif
 #else // ESP32 Before IDF 4.0
@@ -46,7 +46,11 @@ static uint8_t __analogVRefPin = 0;
 #endif
 
 static uint8_t __analogAttenuation = 3;//11db
-static uint8_t __analogWidth = 3;//12 bits
+#if CONFIG_IDF_TARGET_ESP32S2
+static uint8_t __analogWidth = 4; // 13 bits
+#else
+static uint8_t __analogWidth = 3; // 12 bits
+#endif
 static uint8_t __analogClockDiv = 1;
 static adc_attenuation_t __pin_attenuation[SOC_GPIO_PIN_COUNT];