[feature] added temperature reading to esp32s3

src/machine/machine_esp32s3_temperature.go

@@ -0,0 +1,43 @@
+//go:build esp32s3
+
+package machine
+
+import "device/esp"
+
+// ReadTemperature reads the on-chip temperature sensor (TSENS) and returns
+// a value in millicelsius (°C × 1000). Uses the default measurement range
+// (offset = 0, approximately −10 °C to 80 °C, ±3 °C accuracy).
+//
+// The conversion uses the same formula as ESP-IDF with no eFuse calibration:
+//
+//	T = (0.4386 × raw − 20.52) °C
+func ReadTemperature() int32 {
+	// Enable TSENS peripheral clock.
+	esp.SENS.SetSAR_PERI_CLK_GATE_CONF_TSENS_CLK_EN(1)
+
+	// Set clock divider to default (6).
+	esp.SENS.SetSAR_TSENS_CTRL_SAR_TSENS_CLK_DIV(6)
+
+	// Power up the temperature sensor.
+	esp.SENS.SetSAR_TSENS_CTRL_SAR_TSENS_POWER_UP_FORCE(1)
+	esp.SENS.SetSAR_TSENS_CTRL2_SAR_TSENS_XPD_FORCE(1)
+	esp.SENS.SetSAR_TSENS_CTRL_SAR_TSENS_POWER_UP(1)
+
+	// Trigger a conversion.
+	esp.SENS.SetSAR_TSENS_CTRL_SAR_TSENS_DUMP_OUT(1)
+
+	// Wait for data ready.
+	for esp.SENS.GetSAR_TSENS_CTRL_SAR_TSENS_READY() == 0 {
+	}
+
+	// Read the 8-bit raw value.
+	raw := int32(esp.SENS.GetSAR_TSENS_CTRL_SAR_TSENS_OUT())
+
+	// Stop the conversion.
+	esp.SENS.SetSAR_TSENS_CTRL_SAR_TSENS_DUMP_OUT(0)
+
+	// Convert to millicelsius using the ESP-IDF integer formula (offset=0):
+	//   T_celsius     = (4386 * raw - 205200) / 10000
+	//   T_millicelsius = (4386 * raw - 205200) / 10
+	return (4386*raw - 205200) / 10
+}