Rework displays in prep for dynamic support and 8bit parallel.

1 files changed, 149 insertions, 0 deletions

diff --git a/shared-module/displayio/Display.c b/shared-module/displayio/Display.c
new file mode 100644
index 000000000..0a14e74bb
--- /dev/null
+++ b/shared-module/displayio/Display.c
@@ -0,0 +1,149 @@
+/*
+ * 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 "shared-bindings/displayio/Display.h"
+
+#include "py/runtime.h"
+#include "shared-bindings/displayio/FourWire.h"
+#include "shared-bindings/displayio/ParallelBus.h"
+
+#include <stdint.h>
+
+#include "tick.h"
+
+#define DELAY 0x80
+
+void common_hal_displayio_display_construct(displayio_display_obj_t* self,
+        mp_obj_t bus, uint16_t width, uint16_t height, int16_t colstart, int16_t rowstart,
+        uint16_t color_depth, uint8_t set_column_command, uint8_t set_row_command,
+        uint8_t write_ram_command, uint8_t* init_sequence, uint16_t init_sequence_len) {
+    self->width = width;
+    self->height = height;
+    self->color_depth = color_depth;
+    self->set_column_command = set_column_command;
+    self->set_row_command = set_row_command;
+    self->write_ram_command = write_ram_command;
+    self->current_group = NULL;
+    self->colstart = colstart;
+    self->rowstart = rowstart;
+
+    if (MP_OBJ_IS_TYPE(bus, &displayio_parallelbus_type)) {
+        self->begin_transaction = common_hal_displayio_parallelbus_begin_transaction;
+        self->send = common_hal_displayio_parallelbus_send;
+        self->end_transaction = common_hal_displayio_parallelbus_end_transaction;
+    } else if (MP_OBJ_IS_TYPE(bus, &displayio_fourwire_type)) {
+        self->begin_transaction = common_hal_displayio_fourwire_begin_transaction;
+        self->send = common_hal_displayio_fourwire_send;
+        self->end_transaction = common_hal_displayio_fourwire_end_transaction;
+    } else {
+        mp_raise_ValueError(translate("Unsupported display bus type"));
+    }
+    self->bus = bus;
+
+    uint32_t i = 0;
+    self->begin_transaction(self->bus);
+    while (i < init_sequence_len) {
+        uint8_t *cmd = init_sequence + i;
+        uint8_t data_size = *(cmd + 1);
+        bool delay = (data_size & DELAY) != 0;
+        data_size &= ~DELAY;
+        uint8_t *data = cmd + 2;
+        self->send(self->bus, true, cmd, 1);
+        self->send(self->bus, false, data, data_size);
+        if (delay) {
+            data_size++;
+            uint16_t delay_length_ms = *(cmd + 1 + data_size);
+            if (delay_length_ms == 255) {
+                delay_length_ms = 500;
+            }
+            uint64_t start = ticks_ms;
+            while (ticks_ms - start < delay_length_ms) {}
+        } else {
+            uint64_t start = ticks_ms;
+            while (ticks_ms - start < 10) {}
+        }
+        i += 2 + data_size;
+    }
+    self->end_transaction(self->bus);
+}
+
+void common_hal_displayio_display_show(displayio_display_obj_t* self, displayio_group_t* root_group) {
+    self->current_group = root_group;
+    common_hal_displayio_display_refresh_soon(self);
+}
+
+void common_hal_displayio_display_refresh_soon(displayio_display_obj_t* self) {
+    self->refresh = true;
+}
+
+int32_t common_hal_displayio_display_wait_for_frame(displayio_display_obj_t* self) {
+    uint64_t last_refresh = self->last_refresh;
+    while (last_refresh == self->last_refresh) {
+        MICROPY_VM_HOOK_LOOP
+    }
+    return 0;
+}
+
+void displayio_display_start_region_update(displayio_display_obj_t* self, uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1) {
+    // TODO(tannewt): Handle displays with single byte bounds.
+    self->begin_transaction(self->bus);
+    uint16_t data[2];
+    self->send(self->bus, true, &self->set_column_command, 1);
+    data[0] = __builtin_bswap16(x0 + self->colstart);
+    data[1] = __builtin_bswap16(x1 + self->colstart);
+    self->send(self->bus, false, (uint8_t*) data, 4);
+    self->send(self->bus, true, &self->set_row_command, 1);
+    data[0] = __builtin_bswap16(y0 + self->rowstart);
+    data[1] = __builtin_bswap16(y1 + self->rowstart);
+    self->send(self->bus, false, (uint8_t*) data, 4);
+    self->send(self->bus, true, &self->write_ram_command, 1);
+}
+
+void displayio_display_finish_region_update(displayio_display_obj_t* self) {
+    self->end_transaction(self->bus);
+}
+
+bool displayio_display_frame_queued(displayio_display_obj_t* self) {
+    // Refresh at ~30 fps.
+    return (ticks_ms - self->last_refresh) > 32;
+}
+
+bool displayio_display_refresh_queued(displayio_display_obj_t* self) {
+    return self->refresh || (self->current_group != NULL && displayio_group_needs_refresh(self->current_group));
+}
+
+void displayio_display_finish_refresh(displayio_display_obj_t* self) {
+    if (self->current_group != NULL) {
+        displayio_group_finish_refresh(self->current_group);
+    }
+    self->refresh = false;
+    self->last_refresh = ticks_ms;
+}
+
+bool displayio_display_send_pixels(displayio_display_obj_t* self, uint32_t* pixels, uint32_t length) {
+    self->send(self->bus, false, (uint8_t*) pixels, length * 4);
+    return true;
+}