feat: add basic support for temperature sensor (tsens) for esp32c3

Author: davoclavo

esp-hal/CHANGELOG.md

@@ -52,7 +52,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - More interrupts are available in `esp_hal::spi::master::SpiInterrupt`, add `enable_listen`,`interrupts` and `clear_interrupts` for ESP32/ESP32-S2 (#2833)
 
 - The `ExtU64` and `RateExtU32` traits have been added to `esp_hal::time` (#2845)
-- Added `tsens::TemperatureSensor` peripheral for ESP32C6
+- Added `tsens::TemperatureSensor` peripheral for ESP32C6 and ESP32C3 (#2875)
 
 ### Changed
 

esp-hal/src/soc/esp32c3/peripherals.rs

@@ -52,6 +52,7 @@ crate::peripherals! {
         SW_INTERRUPT <= virtual,
         TIMG0 <= TIMG0,
         TIMG1 <= TIMG1,
+        TSENS <= virtual,
         TWAI0 <= TWAI0,
         UART0 <= UART0,
         UART1 <= UART1,

esp-hal/src/system.rs

@@ -401,6 +401,10 @@ impl PeripheralClockControl {
             Peripheral::Systimer => {
                 perip_clk_en0.modify(|_, w| w.systimer_clk_en().bit(enable));
             }
+            #[cfg(tsens)]
+            Peripheral::Tsens => {
+                perip_clk_en1.modify(|_, w| w.tsens_clk_en().bit(enable));
+            }
         }
     }
 
@@ -613,11 +617,16 @@ impl PeripheralClockControl {
                 perip_rst_en0.modify(|_, w| w.systimer_rst().set_bit());
                 perip_rst_en0.modify(|_, w| w.systimer_rst().clear_bit());
             }
-            #[cfg(tsens)]
+            #[cfg(all(tsens, esp32c6))]
             Peripheral::Tsens => {
                 perip_rst_en0.modify(|_, w| w.tsens_rst().set_bit());
                 perip_rst_en0.modify(|_, w| w.tsens_rst().clear_bit());
             }
+            #[cfg(all(tsens, esp32c3))]
+            Peripheral::Tsens => {
+                perip_rst_en1.modify(|_, w| w.tsens_rst().set_bit());
+                perip_rst_en1.modify(|_, w| w.tsens_rst().clear_bit());
+            }
         });
     }
 }

esp-hal/src/tsens.rs

@@ -72,6 +72,9 @@ impl<'d> TemperatureSensor<'d> {
         // Power Up
         apb_saradc.tsens_ctrl().write(|w| w.pu().set_bit());
 
+        // Default to XTAL_CLK source, as it works out of the box on both esp32c6 and esp32c3
+        apb_saradc.tsens_ctrl2().write(|w| w.clk_sel().set_bit());
+
         Self {
             _guard: guard,
             _peripheral: peripheral,

esp-metadata/devices/esp32c3.toml

@@ -52,6 +52,7 @@ symbols = [
     "phy",
     "bt",
     "wifi",
+    "tsens",
 
     # ROM capabilities
     "rom_crc_le",

examples/src/bin/temperature_sensor.rs

@@ -1,7 +1,7 @@
 //! This example uses the internal temperature sensor to measure the chip's temperature
 //!
 
-//% CHIPS: esp32c6
+//% CHIPS: esp32c6 esp32c3
 
 #![no_std]
 #![no_main]
@@ -12,6 +12,7 @@ use esp_println::println;
 
 #[entry]
 fn main() -> ! {
+    esp_println::logger::init_logger_from_env();
     let peripherals = esp_hal::init(esp_hal::Config::default());
 
     let temperature_sensor = TemperatureSensor::new(peripherals.TSENS);