Merge pull request #3185 from hierophect/esp32-pulseio

ESP32-S2: PWMOut

10 files changed, 480 insertions, 2 deletions

diff --git a/ports/esp32s2/Makefile b/ports/esp32s2/Makefile
index 29abcab8e..401a06a84 100644
--- a/ports/esp32s2/Makefile
+++ b/ports/esp32s2/Makefile
@@ -270,7 +270,7 @@ esp-idf-stamp: $(BUILD)/esp-idf/config/sdkconfig.h
 
 $(BUILD)/firmware.elf: $(OBJ) | esp-idf-stamp
 	$(STEPECHO) "LINK $@"
-	$(Q)$(CC) -o $@ $(LDFLAGS) $^ $(ESP_IDF_COMPONENTS_EXPANDED) $(BINARY_BLOBS) build-$(BOARD)/esp-idf/esp-idf/newlib/libnewlib.a -u newlib_include_pthread_impl
+	$(Q)$(CC) -o $@ $(LDFLAGS) $^ $(ESP_IDF_COMPONENTS_EXPANDED) $(BINARY_BLOBS) build-$(BOARD)/esp-idf/esp-idf/newlib/libnewlib.a -u newlib_include_pthread_impl -Wl,--start-group $(LIBS) -Wl,--end-group
 	# $(Q)$(SIZE) $@ | $(PYTHON3) $(TOP)/tools/build_memory_info.py $(BUILD)/esp-idf/esp-idf/esp32s2/esp32s2_out.ld
 
 $(BUILD)/circuitpython-firmware.bin: $(BUILD)/firmware.elf
diff --git a/ports/esp32s2/common-hal/pulseio/PWMOut.c b/ports/esp32s2/common-hal/pulseio/PWMOut.c
new file mode 100644
index 000000000..c4f5e18dd
--- /dev/null
+++ b/ports/esp32s2/common-hal/pulseio/PWMOut.c
@@ -0,0 +1,198 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ * Uses code from Micropython, Copyright (c) 2013-2016 Damien P. George
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#include <math.h>
+
+#include "common-hal/pulseio/PWMOut.h"
+#include "shared-bindings/pulseio/PWMOut.h"
+#include "py/runtime.h"
+#include "driver/ledc.h"
+
+#define INDEX_EMPTY 0xFF
+
+STATIC uint32_t reserved_timer_freq[LEDC_TIMER_MAX];
+STATIC uint8_t reserved_channels[LEDC_CHANNEL_MAX];
+STATIC bool never_reset_tim[LEDC_TIMER_MAX];
+STATIC bool never_reset_chan[LEDC_CHANNEL_MAX];
+
+void pwmout_reset(void) {
+    for (size_t i = 0; i < LEDC_CHANNEL_MAX; i++ ) {
+        ledc_stop(LEDC_LOW_SPEED_MODE, i, 0);
+        if (!never_reset_chan[i]) {
+            reserved_channels[i] = INDEX_EMPTY;
+        }
+    }
+    for (size_t i = 0; i < LEDC_TIMER_MAX; i++ ) {
+        ledc_timer_rst(LEDC_LOW_SPEED_MODE, i);
+        if (!never_reset_tim[i]) {
+            reserved_timer_freq[i] = 0;
+        }
+    }
+}
+
+pwmout_result_t common_hal_pulseio_pwmout_construct(pulseio_pwmout_obj_t* self,
+                                                    const mcu_pin_obj_t* pin,
+                                                    uint16_t duty,
+                                                    uint32_t frequency,
+                                                    bool variable_frequency) {
+    // Calculate duty cycle
+    uint32_t duty_bits = 0;
+    uint32_t interval = LEDC_APB_CLK_HZ/frequency;
+    for (size_t i = 0; i < 32; i++) {
+        if(!(interval >> i)) {
+            duty_bits = i - 1;
+            break;
+        }
+    }
+    if (duty_bits < 1) {
+        mp_raise_ValueError(translate("Invalid frequency"));
+    } else if (duty_bits >= LEDC_TIMER_14_BIT) {
+        duty_bits = LEDC_TIMER_13_BIT;
+    }
+
+    // Find a viable timer
+    size_t timer_index = INDEX_EMPTY;
+    size_t channel_index = INDEX_EMPTY;
+    for (size_t i = 0; i < LEDC_TIMER_MAX; i++) {
+        if ((reserved_timer_freq[i] == frequency) && !variable_frequency) {
+            //prioritize matched frequencies so we don't needlessly take slots
+            timer_index = i;
+            break;
+        } else if (reserved_timer_freq[i] == 0) {
+            timer_index = i;
+            break;
+        }
+    }
+    if (timer_index == INDEX_EMPTY) {
+        // Running out of timers isn't pin related on ESP32S2 so we can't re-use error messages
+        mp_raise_ValueError(translate("No more timers available"));
+    }
+
+    // Find a viable channel
+    for (size_t i = 0; i < LEDC_CHANNEL_MAX; i++) {
+        if (reserved_channels[i] == INDEX_EMPTY) {
+            channel_index = i;
+            break;
+        }
+    }
+    if (channel_index == INDEX_EMPTY) {
+        mp_raise_ValueError(translate("No more channels available"));
+    }
+
+    // Run configuration
+    self->tim_handle.timer_num = timer_index;
+    self->tim_handle.duty_resolution = duty_bits;
+    self->tim_handle.freq_hz = frequency;
+    self->tim_handle.speed_mode = LEDC_LOW_SPEED_MODE;
+    self->tim_handle.clk_cfg = LEDC_AUTO_CLK;
+
+    if (ledc_timer_config(&(self->tim_handle)) != ESP_OK) {
+        mp_raise_ValueError(translate("Could not initialize timer"));
+    }
+
+    self->chan_handle.channel = channel_index;
+    self->chan_handle.duty = duty >> (16 - duty_bits);
+    self->chan_handle.gpio_num = pin->number;
+    self->chan_handle.speed_mode = LEDC_LOW_SPEED_MODE; // Only LS is allowed on ESP32-S2
+    self->chan_handle.hpoint = 0;
+    self->chan_handle.timer_sel = timer_index;
+
+    if (ledc_channel_config(&(self->chan_handle))) {
+        mp_raise_ValueError(translate("Could not initialize channel"));
+    }
+
+    // Make reservations
+    reserved_timer_freq[timer_index] = frequency;
+    reserved_channels[channel_index] = timer_index;
+
+    self->variable_frequency = variable_frequency;
+    self->pin_number = pin->number;
+    self->deinited = false;
+    self->duty_resolution = duty_bits;
+    claim_pin(pin);
+
+    // Set initial duty
+    common_hal_pulseio_pwmout_set_duty_cycle(self, duty);
+
+    return PWMOUT_OK;
+}
+
+void common_hal_pulseio_pwmout_never_reset(pulseio_pwmout_obj_t *self) {
+    never_reset_tim[self->tim_handle.timer_num] = true;
+    never_reset_chan[self->chan_handle.channel] = true;
+}
+
+void common_hal_pulseio_pwmout_reset_ok(pulseio_pwmout_obj_t *self) {
+    never_reset_tim[self->tim_handle.timer_num] = false;
+    never_reset_chan[self->chan_handle.channel] = false;
+}
+
+bool common_hal_pulseio_pwmout_deinited(pulseio_pwmout_obj_t* self) {
+    return self->deinited == true;
+}
+
+void common_hal_pulseio_pwmout_deinit(pulseio_pwmout_obj_t* self) {
+    if (common_hal_pulseio_pwmout_deinited(self)) {
+        return;
+    }
+    ledc_stop(LEDC_LOW_SPEED_MODE, self->chan_handle.channel, 0);
+    // Search if any other channel is using the timer
+    bool taken = false;
+    for (size_t i =0; i < LEDC_CHANNEL_MAX; i++) {
+        if (reserved_channels[i] == self->tim_handle.timer_num) {
+            taken = true;
+        }
+    }
+    // Variable frequency means there's only one channel on the timer
+    if (!taken || self->variable_frequency) {
+        ledc_timer_rst(LEDC_LOW_SPEED_MODE, self->tim_handle.timer_num);
+        reserved_timer_freq[self->tim_handle.timer_num] = 0;
+    }
+    reset_pin_number(self->pin_number);
+    reserved_channels[self->chan_handle.channel] = INDEX_EMPTY;
+    self->deinited = true;
+}
+
+void common_hal_pulseio_pwmout_set_duty_cycle(pulseio_pwmout_obj_t* self, uint16_t duty) {
+    ledc_set_duty(LEDC_LOW_SPEED_MODE, self->chan_handle.channel, duty >> (16 - self->duty_resolution));
+    ledc_update_duty(LEDC_LOW_SPEED_MODE, self->chan_handle.channel);
+}
+
+uint16_t common_hal_pulseio_pwmout_get_duty_cycle(pulseio_pwmout_obj_t* self) {
+    return ledc_get_duty(LEDC_LOW_SPEED_MODE, self->chan_handle.channel) << (16 - self->duty_resolution);
+}
+
+void common_hal_pulseio_pwmout_set_frequency(pulseio_pwmout_obj_t* self, uint32_t frequency) {
+    ledc_set_freq(LEDC_LOW_SPEED_MODE, self->tim_handle.timer_num, frequency);
+}
+
+uint32_t common_hal_pulseio_pwmout_get_frequency(pulseio_pwmout_obj_t* self) {
+    return ledc_get_freq(LEDC_LOW_SPEED_MODE, self->tim_handle.timer_num);
+}
+
+bool common_hal_pulseio_pwmout_get_variable_frequency(pulseio_pwmout_obj_t* self) {
+    return self->variable_frequency;
+}
diff --git a/ports/esp32s2/common-hal/pulseio/PWMOut.h b/ports/esp32s2/common-hal/pulseio/PWMOut.h
new file mode 100644
index 000000000..90a0c3ed9
--- /dev/null
+++ b/ports/esp32s2/common-hal/pulseio/PWMOut.h
@@ -0,0 +1,45 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MICROPY_INCLUDED_ESP32S2_COMMON_HAL_PULSEIO_PWMOUT_H
+#define MICROPY_INCLUDED_ESP32S2_COMMON_HAL_PULSEIO_PWMOUT_H
+
+#include "common-hal/microcontroller/Pin.h"
+#include "driver/ledc.h"
+
+typedef struct {
+    mp_obj_base_t base;
+    ledc_timer_config_t tim_handle;
+    ledc_channel_config_t chan_handle;
+    uint16_t pin_number;
+    uint8_t duty_resolution;
+    bool variable_frequency: 1;
+    bool deinited: 1;
+} pulseio_pwmout_obj_t;
+
+void pwmout_reset(void);
+
+#endif // MICROPY_INCLUDED_ESP32S2_COMMON_HAL_PULSEIO_PWMOUT_H
diff --git a/ports/esp32s2/common-hal/pulseio/PulseIn.c b/ports/esp32s2/common-hal/pulseio/PulseIn.c
new file mode 100644
index 000000000..65fc6631d
--- /dev/null
+++ b/ports/esp32s2/common-hal/pulseio/PulseIn.c
@@ -0,0 +1,75 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "common-hal/pulseio/PulseIn.h"
+#include "py/runtime.h"
+
+// STATIC void pulsein_handler(uint8_t num) {
+// }
+
+void pulsein_reset(void) {
+}
+
+void common_hal_pulseio_pulsein_construct(pulseio_pulsein_obj_t* self, const mcu_pin_obj_t* pin,
+                                             uint16_t maxlen, bool idle_state) {
+    mp_raise_NotImplementedError(translate("PulseIn not supported on this chip"));
+}
+
+bool common_hal_pulseio_pulsein_deinited(pulseio_pulsein_obj_t* self) {
+    return false;
+}
+
+void common_hal_pulseio_pulsein_deinit(pulseio_pulsein_obj_t* self) {
+}
+
+void common_hal_pulseio_pulsein_pause(pulseio_pulsein_obj_t* self) {
+}
+
+void common_hal_pulseio_pulsein_resume(pulseio_pulsein_obj_t* self, uint16_t trigger_duration) {
+}
+
+void common_hal_pulseio_pulsein_clear(pulseio_pulsein_obj_t* self) {
+}
+
+uint16_t common_hal_pulseio_pulsein_get_item(pulseio_pulsein_obj_t* self, int16_t index) {
+    return false;
+}
+
+uint16_t common_hal_pulseio_pulsein_popleft(pulseio_pulsein_obj_t* self) {
+    return false;
+}
+
+uint16_t common_hal_pulseio_pulsein_get_maxlen(pulseio_pulsein_obj_t* self) {
+    return false;
+}
+
+bool common_hal_pulseio_pulsein_get_paused(pulseio_pulsein_obj_t* self) {
+    return false;
+}
+
+uint16_t common_hal_pulseio_pulsein_get_len(pulseio_pulsein_obj_t* self) {
+    return false;
+}
diff --git a/ports/esp32s2/common-hal/pulseio/PulseIn.h b/ports/esp32s2/common-hal/pulseio/PulseIn.h
new file mode 100644
index 000000000..b317c516c
--- /dev/null
+++ b/ports/esp32s2/common-hal/pulseio/PulseIn.h
@@ -0,0 +1,53 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MICROPY_INCLUDED_ESP32S2_COMMON_HAL_PULSEIO_PULSEIN_H
+#define MICROPY_INCLUDED_ESP32S2_COMMON_HAL_PULSEIO_PULSEIN_H
+
+#include "common-hal/microcontroller/Pin.h"
+
+#include "py/obj.h"
+
+typedef struct {
+    mp_obj_base_t base;
+
+    const mcu_pin_obj_t* pin;
+    bool idle_state;
+    bool paused;
+    volatile bool first_edge;
+
+    uint16_t* buffer;
+    uint16_t maxlen;
+
+    volatile uint16_t start;
+    volatile uint16_t len;
+    volatile uint32_t last_overflow;
+    volatile uint16_t last_count;
+} pulseio_pulsein_obj_t;
+
+void pulsein_reset(void);
+
+#endif // MICROPY_INCLUDED_ESP32S2_COMMON_HAL_PULSEIO_PULSEIN_H
diff --git a/ports/esp32s2/common-hal/pulseio/PulseOut.c b/ports/esp32s2/common-hal/pulseio/PulseOut.c
new file mode 100644
index 000000000..c448c578d
--- /dev/null
+++ b/ports/esp32s2/common-hal/pulseio/PulseOut.c
@@ -0,0 +1,60 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "common-hal/pulseio/PulseOut.h"
+
+#include "shared-bindings/pulseio/PWMOut.h"
+#include "py/runtime.h"
+
+// STATIC void turn_on(pulseio_pulseout_obj_t *pulseout) {
+// }
+
+// STATIC void turn_off(pulseio_pulseout_obj_t *pulseout) {
+// }
+
+// STATIC void start_timer(void) {
+// }
+
+// STATIC void pulseout_event_handler(void) {
+// }
+
+void pulseout_reset() {
+}
+
+void common_hal_pulseio_pulseout_construct(pulseio_pulseout_obj_t* self,
+                                           const pulseio_pwmout_obj_t* carrier) {
+    mp_raise_NotImplementedError(translate("PulseOut not supported on this chip"));
+}
+
+bool common_hal_pulseio_pulseout_deinited(pulseio_pulseout_obj_t* self) {
+    return false;
+}
+
+void common_hal_pulseio_pulseout_deinit(pulseio_pulseout_obj_t* self) {
+}
+
+void common_hal_pulseio_pulseout_send(pulseio_pulseout_obj_t* self, uint16_t* pulses, uint16_t length) {
+}
diff --git a/ports/esp32s2/common-hal/pulseio/PulseOut.h b/ports/esp32s2/common-hal/pulseio/PulseOut.h
new file mode 100644
index 000000000..f465d0079
--- /dev/null
+++ b/ports/esp32s2/common-hal/pulseio/PulseOut.h
@@ -0,0 +1,42 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MICROPY_INCLUDED_ESP32S2_COMMON_HAL_PULSEIO_PULSEOUT_H
+#define MICROPY_INCLUDED_ESP32S2_COMMON_HAL_PULSEIO_PULSEOUT_H
+
+#include "common-hal/microcontroller/Pin.h"
+#include "common-hal/pulseio/PWMOut.h"
+
+#include "py/obj.h"
+
+typedef struct {
+    mp_obj_base_t base;
+    pulseio_pwmout_obj_t *pwmout;
+} pulseio_pulseout_obj_t;
+
+void pulseout_reset(void);
+
+#endif // MICROPY_INCLUDED_ESP32S2_COMMON_HAL_PULSEIO_PULSEOUT_H
diff --git a/ports/esp32s2/common-hal/pulseio/__init__.c b/ports/esp32s2/common-hal/pulseio/__init__.c
new file mode 100644
index 000000000..2bee925bc
--- /dev/null
+++ b/ports/esp32s2/common-hal/pulseio/__init__.c
@@ -0,0 +1 @@
+// No pulseio module functions.
diff --git a/ports/esp32s2/mpconfigport.mk b/ports/esp32s2/mpconfigport.mk
index 713ccbb09..c2d21e084 100644
--- a/ports/esp32s2/mpconfigport.mk
+++ b/ports/esp32s2/mpconfigport.mk
@@ -25,7 +25,7 @@ CIRCUITPY_FREQUENCYIO = 0
 CIRCUITPY_I2CPERIPHERAL = 0
 CIRCUITPY_MICROCONTROLLER = 1
 CIRCUITPY_NVM = 0
-CIRCUITPY_PULSEIO = 0
+CIRCUITPY_PULSEIO = 1
 CIRCUITPY_ROTARYIO = 0
 CIRCUITPY_RTC = 0
 CIRCUITPY_TOUCHIO = 0
diff --git a/ports/esp32s2/supervisor/port.c b/ports/esp32s2/supervisor/port.c
index a80550b30..e4767e514 100644
--- a/ports/esp32s2/supervisor/port.c
+++ b/ports/esp32s2/supervisor/port.c
@@ -38,6 +38,7 @@
 #include "common-hal/busio/I2C.h"
 #include "common-hal/busio/SPI.h"
 #include "common-hal/busio/UART.h"
+#include "common-hal/pulseio/PWMOut.h"
 #include "supervisor/memory.h"
 #include "supervisor/shared/tick.h"
 
@@ -64,6 +65,9 @@ void reset_port(void) {
     // A larger delay so the idle task can run and do any IDF cleanup needed.
     vTaskDelay(4);
 
+#if CIRCUITPY_PULSEIO
+    pwmout_reset();
+#endif
 #if CIRCUITPY_BUSIO
     i2c_reset();
     spi_reset();