1 files changed, 127 insertions, 0 deletions
diff --git a/circuitpython/shared-module/displayio/I2CDisplay.c b/circuitpython/shared-module/displayio/I2CDisplay.c
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+++ b/circuitpython/shared-module/displayio/I2CDisplay.c
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+/*
+ * 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/I2CDisplay.h"
+
+#include <stdint.h>
+#include <string.h>
+
+#include "py/gc.h"
+#include "py/runtime.h"
+#include "shared-bindings/busio/I2C.h"
+#include "shared-bindings/digitalio/DigitalInOut.h"
+#include "shared-bindings/microcontroller/Pin.h"
+#include "shared-bindings/microcontroller/__init__.h"
+#include "shared-bindings/time/__init__.h"
+#include "shared-module/displayio/display_core.h"
+
+void common_hal_displayio_i2cdisplay_construct(displayio_i2cdisplay_obj_t *self,
+    busio_i2c_obj_t *i2c, uint16_t device_address, const mcu_pin_obj_t *reset) {
+
+    // Reset the display before probing
+    self->reset.base.type = &mp_type_NoneType;
+    if (reset != NULL) {
+        self->reset.base.type = &digitalio_digitalinout_type;
+        common_hal_digitalio_digitalinout_construct(&self->reset, reset);
+        common_hal_digitalio_digitalinout_switch_to_output(&self->reset, true, DRIVE_MODE_PUSH_PULL);
+        common_hal_never_reset_pin(reset);
+        common_hal_displayio_i2cdisplay_reset(self);
+    }
+
+    // Probe the bus to see if a device acknowledges the given address.
+    if (!common_hal_busio_i2c_probe(i2c, device_address)) {
+        self->base.type = &mp_type_NoneType;
+        mp_raise_ValueError_varg(translate("Unable to find I2C Display at %x"), device_address);
+    }
+
+    // Write to the device and return 0 on success or an appropriate error code from mperrno.h
+    self->bus = i2c;
+    common_hal_busio_i2c_never_reset(self->bus);
+    // Our object is statically allocated off the heap so make sure the bus object lives to the end
+    // of the heap as well.
+    gc_never_free(self->bus);
+
+    self->address = device_address;
+}
+
+void common_hal_displayio_i2cdisplay_deinit(displayio_i2cdisplay_obj_t *self) {
+    if (self->bus == &self->inline_bus) {
+        common_hal_busio_i2c_deinit(self->bus);
+    }
+
+    if (self->reset.base.type == &digitalio_digitalinout_type) {
+        common_hal_digitalio_digitalinout_deinit(&self->reset);
+    }
+}
+
+bool common_hal_displayio_i2cdisplay_reset(mp_obj_t obj) {
+    displayio_i2cdisplay_obj_t *self = MP_OBJ_TO_PTR(obj);
+    if (self->reset.base.type == &mp_type_NoneType) {
+        return false;
+    }
+
+    common_hal_digitalio_digitalinout_set_value(&self->reset, false);
+    common_hal_mcu_delay_us(4);
+    common_hal_digitalio_digitalinout_set_value(&self->reset, true);
+    return true;
+}
+
+bool common_hal_displayio_i2cdisplay_bus_free(mp_obj_t obj) {
+    displayio_i2cdisplay_obj_t *self = MP_OBJ_TO_PTR(obj);
+    if (!common_hal_busio_i2c_try_lock(self->bus)) {
+        return false;
+    }
+    common_hal_busio_i2c_unlock(self->bus);
+    return true;
+}
+
+bool common_hal_displayio_i2cdisplay_begin_transaction(mp_obj_t obj) {
+    displayio_i2cdisplay_obj_t *self = MP_OBJ_TO_PTR(obj);
+    return common_hal_busio_i2c_try_lock(self->bus);
+}
+
+void common_hal_displayio_i2cdisplay_send(mp_obj_t obj, display_byte_type_t data_type,
+    display_chip_select_behavior_t chip_select, const uint8_t *data, uint32_t data_length) {
+    displayio_i2cdisplay_obj_t *self = MP_OBJ_TO_PTR(obj);
+    if (data_type == DISPLAY_COMMAND) {
+        uint8_t command_bytes[2 * data_length];
+        for (uint32_t i = 0; i < data_length; i++) {
+            command_bytes[2 * i] = 0x80;
+            command_bytes[2 * i + 1] = data[i];
+        }
+        common_hal_busio_i2c_write(self->bus, self->address, command_bytes, 2 * data_length);
+    } else {
+        uint8_t data_bytes[data_length + 1];
+        data_bytes[0] = 0x40;
+        memcpy(data_bytes + 1, data, data_length);
+        common_hal_busio_i2c_write(self->bus, self->address, data_bytes, data_length + 1);
+    }
+}
+
+void common_hal_displayio_i2cdisplay_end_transaction(mp_obj_t obj) {
+    displayio_i2cdisplay_obj_t *self = MP_OBJ_TO_PTR(obj);
+    common_hal_busio_i2c_unlock(self->bus);
+}