rotaryio implementation for esp32s2

4 files changed, 158 insertions, 1 deletions

diff --git a/ports/esp32s2/common-hal/rotaryio/IncrementalEncoder.c b/ports/esp32s2/common-hal/rotaryio/IncrementalEncoder.c
new file mode 100644
index 000000000..bbff36374
--- /dev/null
+++ b/ports/esp32s2/common-hal/rotaryio/IncrementalEncoder.c
@@ -0,0 +1,115 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2018 Scott Shawcroft 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/rotaryio/IncrementalEncoder.h"
+
+#include "py/runtime.h"
+#include "supervisor/shared/translate.h"
+
+#include "driver/pcnt.h"
+
+static void pcnt_reset(int unit) {
+    // Initialize PCNT's counter
+    pcnt_counter_pause(unit);
+    pcnt_counter_clear(unit);
+
+    // Everything is set up, now go to counting
+    pcnt_counter_resume(unit);
+}
+
+static void pcnt_init(int unit, rotaryio_incrementalencoder_obj_t* self) {
+    // Prepare configuration for the PCNT unit
+    pcnt_config_t pcnt_config = {
+        // Set PCNT input signal and control GPIOs
+        .pulse_gpio_num = self->pin_a->number,
+        .ctrl_gpio_num = self->pin_b->number,
+        .channel = PCNT_CHANNEL_0,
+        .unit = unit,
+        // What to do on the positive / negative edge of pulse input?
+        .pos_mode = PCNT_COUNT_DEC,   // Count up on the positive edge
+        .neg_mode = PCNT_COUNT_INC,   // Keep the counter value on the negative edge
+        // What to do when control input is low or high?
+        .lctrl_mode = PCNT_MODE_REVERSE, // Reverse counting direction if low
+        .hctrl_mode = PCNT_MODE_KEEP,    // Keep the primary counter mode if high
+    };
+    // Initialize PCNT unit
+    pcnt_unit_config(&pcnt_config);
+
+    // Configure channel 1
+    pcnt_config.pulse_gpio_num = self->pin_b->number;
+    pcnt_config.ctrl_gpio_num = self->pin_a->number;
+    pcnt_config.channel = PCNT_CHANNEL_1;
+    pcnt_config.pos_mode = PCNT_COUNT_INC;
+    pcnt_config.neg_mode = PCNT_COUNT_DEC;
+    pcnt_unit_config(&pcnt_config);
+
+    // Configure and enable the input filter
+    pcnt_set_filter_value(unit, 100);
+    pcnt_filter_enable(unit);
+
+    pcnt_reset(unit);
+}
+
+void common_hal_rotaryio_incrementalencoder_construct(rotaryio_incrementalencoder_obj_t* self,
+    const mcu_pin_obj_t* pin_a, const mcu_pin_obj_t* pin_b) {
+    claim_pin(pin_a);
+    claim_pin(pin_b);
+
+    self->pin_a = pin_a;
+    self->pin_b = pin_b;
+
+    self->position = 0;
+
+    pcnt_init(PCNT_UNIT_0, self);
+}
+
+bool common_hal_rotaryio_incrementalencoder_deinited(rotaryio_incrementalencoder_obj_t* self) {
+    return self->pin_a == NULL;
+}
+
+void common_hal_rotaryio_incrementalencoder_deinit(rotaryio_incrementalencoder_obj_t* self) {
+    if (common_hal_rotaryio_incrementalencoder_deinited(self)) {
+        return;
+    }
+
+    reset_pin_number(self->pin_a->number);
+    self->pin_a = NULL;
+
+    reset_pin_number(self->pin_b->number);
+    self->pin_b = NULL;
+}
+
+mp_int_t common_hal_rotaryio_incrementalencoder_get_position(rotaryio_incrementalencoder_obj_t* self) {
+    int16_t count = 0;
+    pcnt_get_counter_value(PCNT_UNIT_0, &count);
+    return self->position+count;
+}
+
+void common_hal_rotaryio_incrementalencoder_set_position(rotaryio_incrementalencoder_obj_t* self,
+        mp_int_t new_position) {
+    self->position = new_position;
+    pcnt_reset(PCNT_UNIT_0);
+}
diff --git a/ports/esp32s2/common-hal/rotaryio/IncrementalEncoder.h b/ports/esp32s2/common-hal/rotaryio/IncrementalEncoder.h
new file mode 100644
index 000000000..0cc2830fb
--- /dev/null
+++ b/ports/esp32s2/common-hal/rotaryio/IncrementalEncoder.h
@@ -0,0 +1,41 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2018 Scott Shawcroft 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_ROTARYIO_INCREMENTALENCODER_H
+#define MICROPY_INCLUDED_ESP32S2_COMMON_HAL_ROTARYIO_INCREMENTALENCODER_H
+
+#include "common-hal/microcontroller/Pin.h"
+
+#include "py/obj.h"
+
+typedef struct {
+    mp_obj_base_t base;
+    const mcu_pin_obj_t * pin_a;
+    const mcu_pin_obj_t * pin_b;
+    mp_int_t position;
+} rotaryio_incrementalencoder_obj_t;
+
+#endif // MICROPY_INCLUDED_ESP32S2_COMMON_HAL_ROTARYIO_INCREMENTALENCODER_H
diff --git a/ports/esp32s2/common-hal/rotaryio/__init__.c b/ports/esp32s2/common-hal/rotaryio/__init__.c
new file mode 100644
index 000000000..0aae79c26
--- /dev/null
+++ b/ports/esp32s2/common-hal/rotaryio/__init__.c
@@ -0,0 +1 @@
+// No rotaryio module functions.
diff --git a/ports/esp32s2/mpconfigport.mk b/ports/esp32s2/mpconfigport.mk
index 4e8a7bdef..dadab3751 100644
--- a/ports/esp32s2/mpconfigport.mk
+++ b/ports/esp32s2/mpconfigport.mk
@@ -19,7 +19,7 @@ CIRCUITPY_AUDIOIO = 0
 CIRCUITPY_COUNTIO = 0
 CIRCUITPY_FREQUENCYIO = 0
 CIRCUITPY_I2CPERIPHERAL = 0
-CIRCUITPY_ROTARYIO = 0
+CIRCUITPY_ROTARYIO = 1
 CIRCUITPY_NVM = 0
 # We don't have enough endpoints to include MIDI.
 CIRCUITPY_USB_MIDI = 0