ParallelImageCapture: Add continuous capture on espressif

locale/circuitpython.pot

@@ -347,6 +347,7 @@ msgstr ""
 msgid "64 bit types"
 msgstr ""
 
+#: ports/atmel-samd/common-hal/alarm/pin/PinAlarm.c
 #: ports/atmel-samd/common-hal/countio/Counter.c
 #: ports/atmel-samd/common-hal/rotaryio/IncrementalEncoder.c
 msgid "A hardware interrupt channel is already in use"
@@ -625,6 +626,10 @@ msgstr ""
 msgid "Buffer too short by %d bytes"
 msgstr ""
 
+#: ports/espressif/common-hal/imagecapture/ParallelImageCapture.c
+msgid "Buffers must be same size"
+msgstr ""
+
 #: ports/atmel-samd/common-hal/paralleldisplay/ParallelBus.c
 #: ports/espressif/common-hal/paralleldisplay/ParallelBus.c
 #: ports/nrf/common-hal/paralleldisplay/ParallelBus.c
@@ -1587,6 +1592,10 @@ msgstr ""
 msgid "No available clocks"
 msgstr ""
 
+#: ports/espressif/common-hal/imagecapture/ParallelImageCapture.c
+msgid "No capture in progress"
+msgstr ""
+
 #: shared-bindings/_bleio/PacketBuffer.c
 msgid "No connection: length cannot be determined"
 msgstr ""
@@ -1607,6 +1616,7 @@ msgstr ""
 msgid "No hardware support on clk pin"
 msgstr ""
 
+#: ports/atmel-samd/common-hal/alarm/pin/PinAlarm.c
 #: ports/atmel-samd/common-hal/frequencyio/FrequencyIn.c
 #: ports/atmel-samd/common-hal/pulseio/PulseIn.c
 msgid "No hardware support on pin"
@@ -1727,7 +1737,6 @@ msgstr ""
 msgid "Only connectable advertisements can be directed"
 msgstr ""
 
-#: ports/atmel-samd/common-hal/alarm/pin/PinAlarm.c
 #: ports/stm/common-hal/alarm/pin/PinAlarm.c
 msgid "Only edge detection is available on this hardware"
 msgstr ""
@@ -1822,6 +1831,7 @@ msgstr ""
 msgid "Permission denied"
 msgstr ""
 
+#: ports/atmel-samd/common-hal/alarm/pin/PinAlarm.c
 #: ports/stm/common-hal/alarm/pin/PinAlarm.c
 msgid "Pin cannot wake from Deep Sleep"
 msgstr ""
@@ -2175,6 +2185,10 @@ msgstr ""
 msgid "The sample's signedness does not match the mixer's"
 msgstr ""
 
+#: shared-module/imagecapture/ParallelImageCapture.c
+msgid "This microcontroller does not support continuous capture."
+msgstr ""
+
 #: shared-module/paralleldisplay/ParallelBus.c
 msgid ""
 "This microcontroller only supports data0=, not data_pins=, because it "
@@ -3880,6 +3894,7 @@ msgstr ""
 msgid "pow() with 3 arguments requires integers"
 msgstr ""
 
+#: ports/espressif/boards/adafruit_feather_esp32s2/mpconfigboard.h
 #: ports/espressif/boards/adafruit_feather_esp32s2_nopsram/mpconfigboard.h
 #: ports/espressif/boards/adafruit_feather_esp32s2_tftback_nopsram/mpconfigboard.h
 #: ports/espressif/boards/adafruit_funhouse/mpconfigboard.h

ports/atmel-samd/common-hal/imagecapture/ParallelImageCapture.c

@@ -151,14 +151,14 @@ static void setup_dma(DmacDescriptor *descriptor, size_t count, uint32_t *buffer
     descriptor->DESCADDR.reg = 0;
 }
 
-#include <string.h>
-
-void common_hal_imagecapture_parallelimagecapture_capture(imagecapture_parallelimagecapture_obj_t *self, void *buffer, size_t bufsize) {
+void common_hal_imagecapture_parallelimagecapture_singleshot_capture(imagecapture_parallelimagecapture_obj_t *self, mp_obj_t buffer) {
+    mp_buffer_info_t bufinfo;
+    mp_get_buffer_raise(buffer, &bufinfo, MP_BUFFER_RW);
 
     uint8_t dma_channel = dma_allocate_channel();
 
-    uint32_t *dest = buffer;
-    size_t count = bufsize / 4; // PCC receives 4 bytes (2 pixels) at a time
+    uint32_t *dest = bufinfo.buf;
+    size_t count = bufinfo.len / 4; // PCC receives 4 bytes (2 pixels) at a time
 
     turn_on_event_system();
 

ports/espressif/common-hal/imagecapture/ParallelImageCapture.c

@@ -79,6 +79,11 @@ void common_hal_imagecapture_parallelimagecapture_construct(imagecapture_paralle
 }
 
 void common_hal_imagecapture_parallelimagecapture_deinit(imagecapture_parallelimagecapture_obj_t *self) {
+    cam_deinit();
+
+    self->buffer1 = NULL;
+    self->buffer2 = NULL;
+
     reset_pin_number(self->data_clock);
     self->data_clock = NO_PIN;
 
@@ -102,28 +107,73 @@ bool common_hal_imagecapture_parallelimagecapture_deinited(imagecapture_parallel
     return self->data_clock == NO_PIN;
 }
 
-void common_hal_imagecapture_parallelimagecapture_capture(imagecapture_parallelimagecapture_obj_t *self, void *buffer, size_t bufsize) {
-    size_t size = bufsize / 2; // count is in pixels
-    if (size != self->config.size || buffer != self->config.frame1_buffer) {
-        cam_deinit();
-        self->config.size = bufsize / 2; // count is in pixels(?)
-        self->config.frame1_buffer = buffer;
-
-        cam_init(&self->config);
-        cam_start();
-    } else {
-        cam_give(buffer);
+void common_hal_imagecapture_parallelimagecapture_continuous_capture_start(imagecapture_parallelimagecapture_obj_t *self, mp_obj_t buffer1, mp_obj_t buffer2) {
+    if (buffer1 == self->buffer1 && buffer2 == self->buffer2) {
+        return;
+    }
+
+    mp_buffer_info_t bufinfo1, bufinfo2 = {};
+    mp_get_buffer_raise(buffer1, &bufinfo1, MP_BUFFER_RW);
+    if (buffer2 != mp_const_none) {
+        mp_get_buffer_raise(buffer2, &bufinfo2, MP_BUFFER_RW);
+        if (bufinfo1.len != bufinfo2.len) {
+            mp_raise_ValueError(translate("Buffers must be same size"));
+        }
     }
 
+    self->buffer1 = buffer1;
+    self->buffer2 = buffer2;
+
+
+    cam_deinit();
+    self->config.size = bufinfo1.len / 2; // count is in pixels
+    self->config.frame1_buffer = bufinfo1.buf;
+    self->config.frame2_buffer = bufinfo2.buf;
+    self->buffer_to_give = NULL;
+
+    cam_init(&self->config);
+    cam_start();
+}
+
+void common_hal_imagecapture_parallelimagecapture_continuous_capture_stop(imagecapture_parallelimagecapture_obj_t *self) {
+    cam_deinit();
+    self->buffer1 = self->buffer2 = NULL;
+    self->buffer_to_give = NULL;
+}
+
+STATIC void common_hal_imagecapture_parallelimagecapture_continuous_capture_give_frame(imagecapture_parallelimagecapture_obj_t *self) {
+    if (self->buffer_to_give) {
+        cam_give(self->buffer_to_give);
+        self->buffer_to_give = NULL;
+    }
+}
+
+mp_obj_t common_hal_imagecapture_parallelimagecapture_continuous_capture_get_frame(imagecapture_parallelimagecapture_obj_t *self) {
+    if (self->buffer1 == NULL) {
+        mp_raise_RuntimeError(translate("No capture in progress"));
+    }
+    common_hal_imagecapture_parallelimagecapture_continuous_capture_give_frame(self);
+
     while (!cam_ready()) {
         RUN_BACKGROUND_TASKS;
         if (mp_hal_is_interrupted()) {
-            self->config.size = 0; // force re-init next time
-            cam_stop();
-            return;
+            return mp_const_none;
         }
     }
 
-    uint8_t *unused;
-    cam_take(&unused); // this just "returns" buffer
+    cam_take(&self->buffer_to_give);
+
+    if (self->buffer_to_give == self->config.frame1_buffer) {
+        return self->buffer1;
+    }
+    if (self->buffer_to_give == self->config.frame2_buffer) {
+        return self->buffer2;
+    }
+
+    return mp_const_none;  // should be unreachable
+}
+
+void common_hal_imagecapture_parallelimagecapture_singleshot_capture(imagecapture_parallelimagecapture_obj_t *self, mp_obj_t buffer) {
+    common_hal_imagecapture_parallelimagecapture_continuous_capture_start(self, buffer, mp_const_none);
+    common_hal_imagecapture_parallelimagecapture_continuous_capture_get_frame(self);
 }

ports/espressif/common-hal/imagecapture/ParallelImageCapture.h

@@ -26,6 +26,7 @@
 
 #pragma once
 
+#include "py/obj.h"
 #include "shared-bindings/imagecapture/ParallelImageCapture.h"
 #include "cam.h"
 
@@ -36,4 +37,6 @@ struct imagecapture_parallelimagecapture_obj {
     gpio_num_t vertical_sync;
     gpio_num_t horizontal_reference;
     uint8_t data_count;
+    mp_obj_t buffer1, buffer2;
+    uint8_t *buffer_to_give;
 };

ports/raspberrypi/common-hal/imagecapture/ParallelImageCapture.c

@@ -137,7 +137,10 @@ bool common_hal_imagecapture_parallelimagecapture_deinited(imagecapture_parallel
     return common_hal_rp2pio_statemachine_deinited(&self->state_machine);
 }
 
-void common_hal_imagecapture_parallelimagecapture_capture(imagecapture_parallelimagecapture_obj_t *self, void *buffer, size_t bufsize) {
+void common_hal_imagecapture_parallelimagecapture_singleshot_capture(imagecapture_parallelimagecapture_obj_t *self, mp_obj_t buffer) {
+    mp_buffer_info_t bufinfo;
+    mp_get_buffer_raise(buffer, &bufinfo, MP_BUFFER_RW);
+
     PIO pio = self->state_machine.pio;
     uint sm = self->state_machine.state_machine;
     uint8_t offset = rp2pio_statemachine_program_offset(&self->state_machine);
@@ -149,7 +152,7 @@ void common_hal_imagecapture_parallelimagecapture_capture(imagecapture_paralleli
     pio_sm_exec(pio, sm, pio_encode_jmp(offset));
     pio_sm_set_enabled(pio, sm, true);
 
-    common_hal_rp2pio_statemachine_readinto(&self->state_machine, buffer, bufsize, 4);
+    common_hal_rp2pio_statemachine_readinto(&self->state_machine, bufinfo.buf, bufinfo.len, 4);
 
     pio_sm_set_enabled(pio, sm, false);
 }

py/circuitpy_defns.mk

@@ -466,6 +466,7 @@ $(filter $(SRC_PATTERNS), \
 	digitalio/DriveMode.c \
 	digitalio/Pull.c \
 	fontio/Glyph.c \
+	imagecapture/ParallelImageCapture.c \
 	math/__init__.c \
 	microcontroller/ResetReason.c \
 	microcontroller/RunMode.c \
@@ -535,6 +536,7 @@ SRC_SHARED_MODULE_ALL = \
 	gamepadshift/GamePadShift.c \
 	gamepadshift/__init__.c \
 	getpass/__init__.c \
+	imagecapture/ParallelImageCapture.c \
 	ipaddress/IPv4Address.c \
 	ipaddress/__init__.c \
 	keypad/__init__.c \

shared-bindings/imagecapture/ParallelImageCapture.c

@@ -25,6 +25,7 @@
  */
 
 #include "py/obj.h"
+#include "py/objproperty.h"
 #include "py/runtime.h"
 
 #include "shared/runtime/context_manager_helpers.h"
@@ -82,20 +83,70 @@ STATIC mp_obj_t imagecapture_parallelimagecapture_make_new(const mp_obj_type_t *
     return self;
 }
 
-//|     def capture(self, buffer: WriteableBuffer, width: int, height: int, bpp: int=16) -> None:
-//|         """Capture a single frame into the given buffer"""
+//|     def capture(self, buffer: WriteableBuffer) -> WriteableBuffer:
+//|         """Capture a single frame into the given buffer.
+//|
+//|         This will stop a continuous-mode capture, if one is in progress."""
 //|         ...
 //|
 STATIC mp_obj_t imagecapture_parallelimagecapture_capture(mp_obj_t self_in, mp_obj_t buffer) {
     imagecapture_parallelimagecapture_obj_t *self = (imagecapture_parallelimagecapture_obj_t *)self_in;
-    mp_buffer_info_t bufinfo;
-    mp_get_buffer_raise(buffer, &bufinfo, MP_BUFFER_RW);
-    common_hal_imagecapture_parallelimagecapture_capture(self, bufinfo.buf, bufinfo.len);
+    common_hal_imagecapture_parallelimagecapture_singleshot_capture(self, buffer);
 
-    return mp_const_none;
+    return buffer;
 }
 STATIC MP_DEFINE_CONST_FUN_OBJ_2(imagecapture_parallelimagecapture_capture_obj, imagecapture_parallelimagecapture_capture);
 
+//|     def continuous_capture_start(self, buffer1: WriteableBuffer, buffer2: WriteableBuffer, /) -> None:
+//|         """Begin capturing into the given buffers in the background.
+//|
+//|         Call `continuous_capture_get_frame` to get the next available
+//|         frame, and `continuous_capture_stop` to stop capturing.
+//|
+//|         Until `continuous_capture_stop` (or `deinit`) is called, the
+//|         `ParallelImageCapture` object keeps references to ``buffer1`` and
+//|         ``buffer2``, so the objects will not be garbage collected."""
+//|         ...
+//|
+STATIC mp_obj_t imagecapture_parallelimagecapture_continuous_capture_start(mp_obj_t self_in, mp_obj_t buffer1, mp_obj_t buffer2) {
+    imagecapture_parallelimagecapture_obj_t *self = (imagecapture_parallelimagecapture_obj_t *)self_in;
+    common_hal_imagecapture_parallelimagecapture_continuous_capture_start(self, buffer1, buffer2);
+
+    return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_3(imagecapture_parallelimagecapture_continuous_capture_start_obj, imagecapture_parallelimagecapture_continuous_capture_start);
+
+//|     def continuous_capture_get_frame(self) -> WriteableBuffer:
+//|         """Return the next available frame, one of the two buffers passed to `continuous_capture_start`"""
+//|         ...
+//|
+STATIC mp_obj_t imagecapture_parallelimagecapture_continuous_capture_get_frame(mp_obj_t self_in) {
+    imagecapture_parallelimagecapture_obj_t *self = (imagecapture_parallelimagecapture_obj_t *)self_in;
+    return common_hal_imagecapture_parallelimagecapture_continuous_capture_get_frame(self);
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_1(imagecapture_parallelimagecapture_continuous_capture_get_frame_obj, imagecapture_parallelimagecapture_continuous_capture_get_frame);
+
+
+
+//|     def continuous_capture_stop(self) -> None:
+//|         """Stop continuous capture.
+//|
+//|         Calling this method also causes the object to release its
+//|         references to the buffers passed to `continuous_capture_start`,
+//|         potentially allowing the objects to be garbage collected."""
+//|         ...
+//|
+STATIC mp_obj_t imagecapture_parallelimagecapture_continuous_capture_stop(mp_obj_t self_in) {
+    imagecapture_parallelimagecapture_obj_t *self = (imagecapture_parallelimagecapture_obj_t *)self_in;
+    common_hal_imagecapture_parallelimagecapture_continuous_capture_stop(self);
+
+    return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_1(imagecapture_parallelimagecapture_continuous_capture_stop_obj, imagecapture_parallelimagecapture_continuous_capture_stop);
+
+
+
+
 //|     def deinit(self) -> None:
 //|         """Deinitialize this instance"""
 //|         ...
@@ -134,6 +185,9 @@ STATIC const mp_rom_map_elem_t imagecapture_parallelimagecapture_locals_dict_tab
     { MP_ROM_QSTR(MP_QSTR___exit__), MP_ROM_PTR(&imagecapture_parallelimagecapture___exit___obj) },
 
     { MP_ROM_QSTR(MP_QSTR_capture), MP_ROM_PTR(&imagecapture_parallelimagecapture_capture_obj) },
+    { MP_ROM_QSTR(MP_QSTR_continuous_capture_start), MP_ROM_PTR(&imagecapture_parallelimagecapture_continuous_capture_start_obj) },
+    { MP_ROM_QSTR(MP_QSTR_continuous_capture_stop), MP_ROM_PTR(&imagecapture_parallelimagecapture_continuous_capture_stop_obj) },
+    { MP_ROM_QSTR(MP_QSTR_continuous_capture_get_frame), MP_ROM_PTR(&imagecapture_parallelimagecapture_continuous_capture_get_frame_obj) },
 };
 
 STATIC MP_DEFINE_CONST_DICT(imagecapture_parallelimagecapture_locals_dict, imagecapture_parallelimagecapture_locals_dict_table);

shared-bindings/imagecapture/ParallelImageCapture.h

@@ -40,4 +40,7 @@ void common_hal_imagecapture_parallelimagecapture_construct(imagecapture_paralle
     const mcu_pin_obj_t *horizontal_sync);
 void common_hal_imagecapture_parallelimagecapture_deinit(imagecapture_parallelimagecapture_obj_t *self);
 bool common_hal_imagecapture_parallelimagecapture_deinited(imagecapture_parallelimagecapture_obj_t *self);
-void common_hal_imagecapture_parallelimagecapture_capture(imagecapture_parallelimagecapture_obj_t *self, void *buffer, size_t bufsize);
+void common_hal_imagecapture_parallelimagecapture_singleshot_capture(imagecapture_parallelimagecapture_obj_t *self, mp_obj_t buffer);
+void common_hal_imagecapture_parallelimagecapture_continuous_capture_start(imagecapture_parallelimagecapture_obj_t *self, mp_obj_t buffer1, mp_obj_t buffer2);
+void common_hal_imagecapture_parallelimagecapture_continuous_capture_stop(imagecapture_parallelimagecapture_obj_t *self);
+mp_obj_t common_hal_imagecapture_parallelimagecapture_continuous_capture_get_frame(imagecapture_parallelimagecapture_obj_t *self);

shared-module/imagecapture/ParallelImageCapture.c

@@ -0,0 +1,44 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 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 "shared-bindings/imagecapture/ParallelImageCapture.h"
+#include "py/runtime.h"
+
+// If the continuous-capture mode isn't supported, then this default (weak) implementation will raise exceptions for you
+__attribute__((weak))
+void common_hal_imagecapture_parallelimagecapture_continuous_capture_start(imagecapture_parallelimagecapture_obj_t *self, mp_obj_t buffer1, mp_obj_t buffer2) {
+    mp_raise_NotImplementedError(translate("This microcontroller does not support continuous capture."));
+}
+
+__attribute__((weak))
+void common_hal_imagecapture_parallelimagecapture_continuous_capture_stop(imagecapture_parallelimagecapture_obj_t *self) {
+    mp_raise_NotImplementedError(translate("This microcontroller does not support continuous capture."));
+}
+
+__attribute__((weak))
+mp_obj_t common_hal_imagecapture_parallelimagecapture_continuous_capture_get_frame(imagecapture_parallelimagecapture_obj_t *self) {
+    mp_raise_NotImplementedError(translate("This microcontroller does not support continuous capture."));
+}