1 files changed, 74 insertions, 0 deletions
diff --git a/shared-module/adafruit_bus_device/I2CDevice.c b/shared-module/adafruit_bus_device/I2CDevice.c
new file mode 100644
index 000000000..d790ff53a
--- /dev/null
+++ b/shared-module/adafruit_bus_device/I2CDevice.c
@@ -0,0 +1,74 @@
+/*
+ * 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/I2CDevice.h"
+#include "shared-bindings/busio/I2C.h"
+#include "py/mperrno.h"
+#include "py/nlr.h"
+#include "py/runtime.h"
+
+void common_hal_adafruit_bus_device_i2cdevice_construct(adafruit_bus_device_i2cdevice_obj_t *self, busio_i2c_obj_t *i2c, uint8_t device_address) {
+    self->i2c = i2c;
+    self->device_address = device_address;
+}
+
+void common_hal_adafruit_bus_device_i2cdevice_lock(adafruit_bus_device_i2cdevice_obj_t *self) {
+    bool success = false;
+    while (!success) {
+        success = common_hal_busio_i2c_try_lock(self->i2c);
+        //RUN_BACKGROUND_TASKS;
+        //mp_handle_pending();
+    }
+}
+
+void common_hal_adafruit_bus_device_i2cdevice_unlock(adafruit_bus_device_i2cdevice_obj_t *self) {
+    common_hal_busio_i2c_unlock(self->i2c);
+}
+
+uint8_t common_hal_adafruit_bus_device_i2cdevice_readinto(adafruit_bus_device_i2cdevice_obj_t *self, mp_obj_t buffer, size_t length) {
+    return common_hal_busio_i2c_read(self->i2c, self->device_address, buffer, length);
+}
+
+uint8_t common_hal_adafruit_bus_device_i2cdevice_write(adafruit_bus_device_i2cdevice_obj_t *self, mp_obj_t buffer, size_t length) {
+    return common_hal_busio_i2c_write(self->i2c, self->device_address, buffer, length, true);
+}
+
+void common_hal_adafruit_bus_device_i2cdevice_probe_for_device(adafruit_bus_device_i2cdevice_obj_t *self) {
+    common_hal_adafruit_bus_device_i2cdevice_lock(self);
+
+    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 status = common_hal_adafruit_bus_device_i2cdevice_readinto(self, (uint8_t*)bufinfo.buf, 1);
+    if (status != 0) {
+        common_hal_adafruit_bus_device_i2cdevice_unlock(self);
+        mp_raise_ValueError_varg(translate("No I2C device at address: %x"), self->device_address);
+    }
+
+    common_hal_adafruit_bus_device_i2cdevice_unlock(self);
+}