1 files changed, 87 insertions, 0 deletions
diff --git a/shared-module/displayio/FourWire.c b/shared-module/displayio/FourWire.c
new file mode 100644
index 000000000..ab01e2609
--- /dev/null
+++ b/shared-module/displayio/FourWire.c
@@ -0,0 +1,87 @@
+/*
+ * 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/FourWire.h"
+
+#include <stdint.h>
+
+#include "shared-bindings/busio/SPI.h"
+#include "shared-bindings/digitalio/DigitalInOut.h"
+
+#include "tick.h"
+
+void common_hal_displayio_fourwire_construct(displayio_fourwire_obj_t* self,
+    busio_spi_obj_t* spi, const mcu_pin_obj_t* command,
+    const mcu_pin_obj_t* chip_select, const mcu_pin_obj_t* reset) {
+
+    self->bus = spi;
+    common_hal_busio_spi_never_reset(self->bus);
+
+    common_hal_digitalio_digitalinout_construct(&self->command, command);
+    common_hal_digitalio_digitalinout_switch_to_output(&self->command, true, DRIVE_MODE_PUSH_PULL);
+    common_hal_digitalio_digitalinout_construct(&self->chip_select, chip_select);
+    common_hal_digitalio_digitalinout_switch_to_output(&self->chip_select, true, DRIVE_MODE_PUSH_PULL);
+
+    common_hal_digitalio_digitalinout_construct(&self->reset, reset);
+    common_hal_digitalio_digitalinout_switch_to_output(&self->reset, true, DRIVE_MODE_PUSH_PULL);
+
+    never_reset_pin_number(command->number);
+    never_reset_pin_number(chip_select->number);
+    never_reset_pin_number(reset->number);
+}
+
+void common_hal_displayio_fourwire_deinit(displayio_fourwire_obj_t* self) {
+    if (self->bus == &self->inline_bus) {
+        common_hal_busio_spi_deinit(self->bus);
+    }
+
+    reset_pin_number(self->command.pin->number);
+    reset_pin_number(self->chip_select.pin->number);
+    reset_pin_number(self->reset.pin->number);
+}
+
+bool common_hal_displayio_fourwire_begin_transaction(mp_obj_t obj) {
+    displayio_fourwire_obj_t* self = MP_OBJ_TO_PTR(obj);
+    if (!common_hal_busio_spi_try_lock(self->bus)) {
+        return false;
+    }
+    // TODO(tannewt): Stop hardcoding SPI frequency, polarity and phase.
+    common_hal_busio_spi_configure(self->bus, 12000000, 0, 0, 8);
+    common_hal_digitalio_digitalinout_set_value(&self->chip_select, false);
+    return true;
+}
+
+void common_hal_displayio_fourwire_send(mp_obj_t obj, bool command, uint8_t *data, uint32_t data_length) {
+    displayio_fourwire_obj_t* self = MP_OBJ_TO_PTR(obj);
+    common_hal_digitalio_digitalinout_set_value(&self->command, !command);
+    common_hal_busio_spi_write(self->bus, data, data_length);
+}
+
+void common_hal_displayio_fourwire_end_transaction(mp_obj_t obj) {
+    displayio_fourwire_obj_t* self = MP_OBJ_TO_PTR(obj);
+    common_hal_digitalio_digitalinout_set_value(&self->chip_select, true);
+    common_hal_busio_spi_unlock(self->bus);
+}