fix: in adc example, use DB_11 for ESP-IDF v4 and DB_12 for ESP-IDF v5

examples/adc.rs

@@ -1,7 +1,7 @@
 //! ADC example, reading a value form a pin and printing it on the terminal
 //!
 
-use esp_idf_sys::{self as _}; // If using the `binstart` feature of `esp-idf-sys`, always keep this module imported
+use esp_idf_sys::{self as _, adc_atten_t}; // If using the `binstart` feature of `esp-idf-sys`, always keep this module imported
 
 use std::thread;
 use std::time::Duration;
@@ -20,14 +20,19 @@ fn main() -> anyhow::Result<()> {
     #[cfg(esp32)]
     let mut adc = AdcDriver::new(peripherals.adc2, &Config::new().calibration(true))?;
 
+    #[cfg(esp_idf_version_major = "4")]
+    const ATTENUATION: adc_atten_t = attenuation::DB_11;
+    #[cfg(not(esp_idf_version_major = "4"))]
+    const ATTENUATION: adc_atten_t = attenuation::DB_12;
+
     // configuring pin to analog read, you can regulate the adc input voltage range depending on your need
     // for this example we use the attenuation of 11db which sets the input voltage range to around 0-3.6V
     #[cfg(not(esp32))]
-    let mut adc_pin: esp_idf_hal::adc::AdcChannelDriver<{ attenuation::DB_12 }, _> =
+    let mut adc_pin: esp_idf_hal::adc::AdcChannelDriver<{ ATTENUATION }, _> =
         AdcChannelDriver::new(peripherals.pins.gpio4)?;
 
     #[cfg(esp32)]
-    let mut adc_pin: esp_idf_hal::adc::AdcChannelDriver<{ attenuation::DB_12 }, _> =
+    let mut adc_pin: esp_idf_hal::adc::AdcChannelDriver<{ ATTENUATION }, _> =
         AdcChannelDriver::new(peripherals.pins.gpio12)?;
 
     loop {