Disable peripherals when unused

esp-hal/CHANGELOG.md

@@ -78,6 +78,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Trying to send a single-shot RMT transmission will result in an error now, `RMT` deals with `u32` now, `PulseCode` is a convenience trait now (#2463)
 - Removed `get_` prefixes from functions (#2528)
 - The `Camera` and `I8080` drivers' constructors now only accepts blocking-mode DMA channels. (#2519)
+- Many peripherals are now disabled by default and also get disabled when the driver is dropped (#2544)
 
 ### Fixed
 

esp-hal/src/aes/esp32.rs

@@ -1,11 +1,7 @@
-use crate::{
-    aes::{Aes, Aes128, Aes192, Aes256, AesFlavour, Endianness, ALIGN_SIZE},
-    system::{Peripheral as PeripheralEnable, PeripheralClockControl},
-};
+use crate::aes::{Aes, Aes128, Aes192, Aes256, AesFlavour, Endianness, ALIGN_SIZE};
 
 impl<'d> Aes<'d> {
     pub(super) fn init(&mut self) {
-        PeripheralClockControl::enable(PeripheralEnable::Aes);
         self.write_endianness(
             Endianness::BigEndian,
             Endianness::BigEndian,

esp-hal/src/aes/esp32cX.rs

@@ -1,11 +1,7 @@
-use crate::{
-    aes::{Aes, Aes128, Aes256, AesFlavour, ALIGN_SIZE},
-    system::{Peripheral as PeripheralEnable, PeripheralClockControl},
-};
+use crate::aes::{Aes, Aes128, Aes256, AesFlavour, ALIGN_SIZE};
 
 impl Aes<'_> {
     pub(super) fn init(&mut self) {
-        PeripheralClockControl::enable(PeripheralEnable::Aes);
         self.write_dma(false);
     }
 

esp-hal/src/aes/esp32s2.rs

@@ -1,11 +1,7 @@
-use crate::{
-    aes::{Aes, Aes128, Aes192, Aes256, AesFlavour, Endianness, ALIGN_SIZE},
-    system::{Peripheral as PeripheralEnable, PeripheralClockControl},
-};
+use crate::aes::{Aes, Aes128, Aes192, Aes256, AesFlavour, Endianness, ALIGN_SIZE};
 
 impl<'d> Aes<'d> {
     pub(super) fn init(&mut self) {
-        PeripheralClockControl::enable(PeripheralEnable::Aes);
         self.write_dma(false);
         self.write_endianness(
             Endianness::BigEndian,

esp-hal/src/aes/esp32s3.rs

@@ -1,11 +1,7 @@
-use crate::{
-    aes::{Aes, Aes128, Aes256, AesFlavour, ALIGN_SIZE},
-    system::{Peripheral as PeripheralEnable, PeripheralClockControl},
-};
+use crate::aes::{Aes, Aes128, Aes256, AesFlavour, ALIGN_SIZE};
 
 impl<'d> Aes<'d> {
     pub(super) fn init(&mut self) {
-        PeripheralClockControl::enable(PeripheralEnable::Aes);
         self.write_dma(false);
     }
 

esp-hal/src/aes/mod.rs

@@ -59,6 +59,7 @@ use crate::{
     peripheral::{Peripheral, PeripheralRef},
     peripherals::AES,
     reg_access::{AlignmentHelper, NativeEndianess},
+    system::GenericPeripheralGuard,
 };
 
 #[cfg_attr(esp32, path = "esp32.rs")]
@@ -136,19 +137,20 @@ pub enum Mode {
 pub struct Aes<'d> {
     aes: PeripheralRef<'d, AES>,
     alignment_helper: AlignmentHelper<NativeEndianess>,
+    _guard: GenericPeripheralGuard<{ crate::system::Peripheral::Aes as u8 }>,
 }
 
 impl<'d> Aes<'d> {
     /// Constructs a new `Aes` instance.
     pub fn new(aes: impl Peripheral<P = AES> + 'd) -> Self {
         crate::into_ref!(aes);
 
-        crate::system::PeripheralClockControl::reset(crate::system::Peripheral::Aes);
-        crate::system::PeripheralClockControl::enable(crate::system::Peripheral::Aes);
+        let guard = GenericPeripheralGuard::new();
 
         let mut ret = Self {
             aes,
             alignment_helper: AlignmentHelper::native_endianess(),
+            _guard: guard,
         };
         ret.init();
 

esp-hal/src/analog/adc/riscv.rs

@@ -8,7 +8,7 @@ use crate::efuse::Efuse;
 use crate::{
     peripheral::PeripheralRef,
     peripherals::APB_SARADC,
-    system::{Peripheral, PeripheralClockControl},
+    system::{GenericPeripheralGuard, Peripheral},
 };
 
 mod calibration;
@@ -396,6 +396,7 @@ pub struct Adc<'d, ADCI> {
     _adc: PeripheralRef<'d, ADCI>,
     attenuations: [Option<Attenuation>; NUM_ATTENS],
     active_channel: Option<u8>,
+    _guard: GenericPeripheralGuard<{ Peripheral::ApbSarAdc as u8 }>,
 }
 
 impl<'d, ADCI> Adc<'d, ADCI>
@@ -408,8 +409,7 @@ where
         adc_instance: impl crate::peripheral::Peripheral<P = ADCI> + 'd,
         config: AdcConfig<ADCI>,
     ) -> Self {
-        PeripheralClockControl::reset(Peripheral::ApbSarAdc);
-        PeripheralClockControl::enable(Peripheral::ApbSarAdc);
+        let guard = GenericPeripheralGuard::new();
 
         unsafe { &*APB_SARADC::PTR }.ctrl().modify(|_, w| unsafe {
             w.start_force().set_bit();
@@ -422,6 +422,7 @@ where
             _adc: adc_instance.into_ref(),
             attenuations: config.attenuations,
             active_channel: None,
+            _guard: guard,
         }
     }
 

esp-hal/src/analog/adc/xtensa.rs

@@ -6,7 +6,7 @@ use crate::efuse::Efuse;
 use crate::{
     peripheral::PeripheralRef,
     peripherals::{APB_SARADC, SENS},
-    system::{Peripheral, PeripheralClockControl},
+    system::{GenericPeripheralGuard, Peripheral},
 };
 
 mod calibration;
@@ -389,6 +389,7 @@ pub struct Adc<'d, ADC> {
     _adc: PeripheralRef<'d, ADC>,
     active_channel: Option<u8>,
     last_init_code: u16,
+    _guard: GenericPeripheralGuard<{ Peripheral::ApbSarAdc as u8 }>,
 }
 
 impl<'d, ADCI> Adc<'d, ADCI>
@@ -401,9 +402,7 @@ where
         adc_instance: impl crate::peripheral::Peripheral<P = ADCI> + 'd,
         config: AdcConfig<ADCI>,
     ) -> Self {
-        PeripheralClockControl::reset(Peripheral::ApbSarAdc);
-        PeripheralClockControl::enable(Peripheral::ApbSarAdc);
-
+        let guard = GenericPeripheralGuard::new();
         let sensors = unsafe { &*SENS::ptr() };
 
         // Set attenuation for pins
@@ -472,6 +471,7 @@ where
             _adc: adc_instance.into_ref(),
             active_channel: None,
             last_init_code: 0,
+            _guard: guard,
         }
     }
 

esp-hal/src/dma/gdma.rs

@@ -753,7 +753,9 @@ impl<'d> Dma<'d> {
     ) -> Dma<'d> {
         crate::into_ref!(dma);
 
-        PeripheralClockControl::enable(Peripheral::Gdma);
+        if PeripheralClockControl::enable(Peripheral::Gdma) {
+            PeripheralClockControl::reset(Peripheral::Gdma);
+        }
         dma.misc_conf().modify(|_, w| w.ahbm_rst_inter().set_bit());
         dma.misc_conf()
             .modify(|_, w| w.ahbm_rst_inter().clear_bit());

esp-hal/src/dma/pdma.rs

@@ -942,7 +942,9 @@ impl<'d> Dma<'d> {
     pub fn new(
         dma: impl crate::peripheral::Peripheral<P = crate::peripherals::DMA> + 'd,
     ) -> Dma<'d> {
-        PeripheralClockControl::enable(Peripheral::Dma);
+        if PeripheralClockControl::enable(Peripheral::Dma) {
+            PeripheralClockControl::reset(Peripheral::Dma);
+        }
 
         #[cfg(esp32)]
         {

esp-hal/src/ecc.rs

@@ -32,7 +32,7 @@ use crate::{
     peripheral::{Peripheral, PeripheralRef},
     peripherals::{Interrupt, ECC},
     reg_access::{AlignmentHelper, SocDependentEndianess},
-    system::{Peripheral as PeripheralEnable, PeripheralClockControl},
+    system::{self, GenericPeripheralGuard},
     InterruptConfigurable,
 };
 
@@ -41,6 +41,7 @@ pub struct Ecc<'d, DM: crate::Mode> {
     ecc: PeripheralRef<'d, ECC>,
     alignment_helper: AlignmentHelper<SocDependentEndianess>,
     phantom: PhantomData<DM>,
+    _guard: GenericPeripheralGuard<{ system::Peripheral::Ecc as u8 }>,
 }
 
 /// ECC interface error
@@ -102,13 +103,13 @@ impl<'d> Ecc<'d, crate::Blocking> {
     pub fn new(ecc: impl Peripheral<P = ECC> + 'd) -> Self {
         crate::into_ref!(ecc);
 
-        PeripheralClockControl::reset(PeripheralEnable::Ecc);
-        PeripheralClockControl::enable(PeripheralEnable::Ecc);
+        let guard = GenericPeripheralGuard::new();
 
         Self {
             ecc,
             alignment_helper: AlignmentHelper::default(),
             phantom: PhantomData,
+            _guard: guard,
         }
     }
 }

esp-hal/src/etm.rs

@@ -59,7 +59,7 @@
 
 use crate::{
     peripheral::{Peripheral, PeripheralRef},
-    system::PeripheralClockControl,
+    system::GenericPeripheralGuard,
 };
 
 /// Unconfigured EtmChannel.
@@ -76,6 +76,7 @@ impl<const C: u8> EtmChannel<C> {
         T: EtmTask,
     {
         let etm = unsafe { crate::peripherals::SOC_ETM::steal() };
+        let guard = GenericPeripheralGuard::new();
 
         etm.ch(C as usize)
             .evt_id()
@@ -92,6 +93,7 @@ impl<const C: u8> EtmChannel<C> {
         EtmConfiguredChannel {
             _event: event,
             _task: task,
+            _guard: guard,
         }
     }
 }
@@ -117,6 +119,7 @@ where
 {
     _event: &'a E,
     _task: &'a T,
+    _guard: GenericPeripheralGuard<{ crate::system::Peripheral::Etm as u8 }>,
 }
 
 impl<E, T, const C: u8> Drop for EtmConfiguredChannel<'_, E, T, C>
@@ -125,7 +128,7 @@ where
     T: EtmTask,
 {
     fn drop(&mut self) {
-        debug!("drop {}", C);
+        debug!("Drop ETM channel {}", C);
         disable_channel(C);
     }
 }
@@ -149,12 +152,9 @@ macro_rules! create_etm {
                 pub fn new(peripheral: impl Peripheral<P = crate::peripherals::SOC_ETM> + 'd) -> Self {
                     crate::into_ref!(peripheral);
 
-                    PeripheralClockControl::reset(crate::system::Peripheral::Etm);
-                    PeripheralClockControl::enable(crate::system::Peripheral::Etm);
-
                     Self {
                         _peripheral: peripheral,
-                        $([< channel $num >]: EtmChannel {},)+
+                        $([< channel $num >]: EtmChannel { },)+
                     }
                 }
             }

esp-hal/src/hmac.rs

@@ -40,7 +40,7 @@ use crate::{
     peripheral::{Peripheral, PeripheralRef},
     peripherals::HMAC,
     reg_access::{AlignmentHelper, SocDependentEndianess},
-    system::{Peripheral as PeripheralEnable, PeripheralClockControl},
+    system::{GenericPeripheralGuard, Peripheral as PeripheralEnable},
 };
 
 /// Provides an interface for interacting with the HMAC hardware peripheral.
@@ -51,6 +51,7 @@ pub struct Hmac<'d> {
     alignment_helper: AlignmentHelper<SocDependentEndianess>,
     byte_written: usize,
     next_command: NextCommand,
+    _guard: GenericPeripheralGuard<{ PeripheralEnable::Hmac as u8 }>,
 }
 
 /// HMAC interface error
@@ -107,14 +108,14 @@ impl<'d> Hmac<'d> {
     pub fn new(hmac: impl Peripheral<P = HMAC> + 'd) -> Self {
         crate::into_ref!(hmac);
 
-        PeripheralClockControl::reset(PeripheralEnable::Hmac);
-        PeripheralClockControl::enable(PeripheralEnable::Hmac);
+        let guard = GenericPeripheralGuard::new();
 
         Self {
             hmac,
             alignment_helper: AlignmentHelper::default(),
             byte_written: 64,
             next_command: NextCommand::None,
+            _guard: guard,
         }
     }
 

esp-hal/src/i2c/master/mod.rs

@@ -59,7 +59,7 @@ use crate::{
         Interrupt,
     },
     private,
-    system::PeripheralClockControl,
+    system::{PeripheralClockControl, PeripheralGuard},
     Async,
     Blocking,
     Cpu,
@@ -273,6 +273,7 @@ pub struct I2c<'d, DM: Mode, T = AnyI2c> {
     i2c: PeripheralRef<'d, T>,
     phantom: PhantomData<DM>,
     config: Config,
+    guard: PeripheralGuard,
 }
 
 impl<T: Instance, DM: Mode> SetConfig for I2c<'_, DM, T> {
@@ -352,8 +353,9 @@ where
     }
 
     fn internal_recover(&self) {
-        PeripheralClockControl::reset(self.driver().info.peripheral);
+        PeripheralClockControl::disable(self.driver().info.peripheral);
         PeripheralClockControl::enable(self.driver().info.peripheral);
+        PeripheralClockControl::reset(self.driver().info.peripheral);
 
         // We know the configuration is valid, we can ignore the result.
         _ = self.driver().setup(&self.config);
@@ -469,15 +471,15 @@ where
     pub fn new_typed(i2c: impl Peripheral<P = T> + 'd, config: Config) -> Self {
         crate::into_ref!(i2c);
 
+        let guard = PeripheralGuard::new(i2c.info().peripheral);
+
         let i2c = I2c {
             i2c,
             phantom: PhantomData,
             config,
+            guard,
         };
 
-        PeripheralClockControl::reset(i2c.driver().info.peripheral);
-        PeripheralClockControl::enable(i2c.driver().info.peripheral);
-
         unwrap!(i2c.driver().setup(&i2c.config));
         i2c
     }
@@ -492,6 +494,7 @@ where
             i2c: self.i2c,
             phantom: PhantomData,
             config: self.config,
+            guard: self.guard,
         }
     }
 
@@ -695,6 +698,7 @@ where
             i2c: self.i2c,
             phantom: PhantomData,
             config: self.config,
+            guard: self.guard,
         }
     }