1 files changed, 102 insertions, 0 deletions
diff --git a/circuitpython/shared-module/adafruit_bus_device/spi_device/SPIDevice.c b/circuitpython/shared-module/adafruit_bus_device/spi_device/SPIDevice.c
new file mode 100644
index 0000000..2f4ab4d
--- /dev/null
+++ b/circuitpython/shared-module/adafruit_bus_device/spi_device/SPIDevice.c
@@ -0,0 +1,102 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020 Mark Komus
+ *
+ * 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/adafruit_bus_device/spi_device/SPIDevice.h"
+#include "shared-bindings/busio/SPI.h"
+#include "shared-bindings/digitalio/DigitalInOut.h"
+#include "py/mperrno.h"
+#include "py/nlr.h"
+#include "py/runtime.h"
+
+void common_hal_adafruit_bus_device_spidevice_construct(adafruit_bus_device_spidevice_obj_t *self, busio_spi_obj_t *spi,  digitalio_digitalinout_obj_t *cs,
+    bool cs_active_value, uint32_t baudrate, uint8_t polarity, uint8_t phase, uint8_t extra_clocks) {
+    self->spi = spi;
+    self->baudrate = baudrate;
+    self->polarity = polarity;
+    self->phase = phase;
+    self->extra_clocks = extra_clocks;
+    self->chip_select = cs;
+    self->cs_active_value = cs_active_value;
+}
+
+mp_obj_t common_hal_adafruit_bus_device_spidevice_enter(adafruit_bus_device_spidevice_obj_t *self) {
+    {
+        mp_obj_t dest[2];
+        mp_load_method(self->spi, MP_QSTR_try_lock, dest);
+
+        while (!mp_obj_is_true(mp_call_method_n_kw(0, 0, dest))) {
+            mp_handle_pending(true);
+        }
+    }
+
+    {
+        mp_obj_t dest[10];
+        mp_load_method(self->spi, MP_QSTR_configure, dest);
+        dest[2] = MP_OBJ_NEW_QSTR(MP_QSTR_baudrate);
+        dest[3] = MP_OBJ_NEW_SMALL_INT(self->baudrate);
+        dest[4] = MP_OBJ_NEW_QSTR(MP_QSTR_polarity);
+        dest[5] = MP_OBJ_NEW_SMALL_INT(self->polarity);
+        dest[6] = MP_OBJ_NEW_QSTR(MP_QSTR_phase);
+        dest[7] = MP_OBJ_NEW_SMALL_INT(self->phase);
+        dest[8] = MP_OBJ_NEW_QSTR(MP_QSTR_bits);
+        dest[9] = MP_OBJ_NEW_SMALL_INT(8);
+        mp_call_method_n_kw(0, 4, dest);
+    }
+
+    if (self->chip_select != MP_OBJ_NULL) {
+        common_hal_digitalio_digitalinout_set_value(MP_OBJ_TO_PTR(self->chip_select), self->cs_active_value);
+    }
+    return self->spi;
+}
+
+void common_hal_adafruit_bus_device_spidevice_exit(adafruit_bus_device_spidevice_obj_t *self) {
+    if (self->chip_select != MP_OBJ_NULL) {
+        common_hal_digitalio_digitalinout_set_value(MP_OBJ_TO_PTR(self->chip_select), !(self->cs_active_value));
+    }
+
+    if (self->extra_clocks > 0) {
+
+        mp_buffer_info_t bufinfo;
+        mp_obj_t buffer = mp_obj_new_bytearray_of_zeros(1);
+
+        mp_get_buffer_raise(buffer, &bufinfo, MP_BUFFER_WRITE);
+        ((uint8_t *)bufinfo.buf)[0] = 0xFF;
+
+        uint8_t clocks = (self->extra_clocks + 7) / 8;
+
+        mp_obj_t dest[3];
+        mp_load_method(self->spi, MP_QSTR_write, dest);
+        dest[2] = buffer;
+        while (clocks > 0) {
+            mp_call_method_n_kw(1, 0, dest);
+            clocks--;
+        }
+    }
+
+    mp_obj_t dest[2];
+    mp_load_method(self->spi, MP_QSTR_unlock, dest);
+    mp_call_method_n_kw(0, 0, dest);
+}