1 files changed, 90 insertions, 0 deletions
diff --git a/circuitpython/shared-module/adafruit_bus_device/i2c_device/I2CDevice.c b/circuitpython/shared-module/adafruit_bus_device/i2c_device/I2CDevice.c
new file mode 100644
index 0000000..a630f1e
--- /dev/null
+++ b/circuitpython/shared-module/adafruit_bus_device/i2c_device/I2CDevice.c
@@ -0,0 +1,90 @@
+/*
+ * 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/i2c_device/I2CDevice.h"
+#include "shared-bindings/busio/I2C.h"
+#include "py/mperrno.h"
+#include "py/nlr.h"
+#include "py/runtime.h"
+#include "shared/runtime/interrupt_char.h"
+
+void common_hal_adafruit_bus_device_i2cdevice_construct(adafruit_bus_device_i2cdevice_obj_t *self, mp_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) {
+    mp_obj_t dest[2];
+    mp_load_method(self->i2c, MP_QSTR_try_lock, dest);
+
+    mp_obj_t success = mp_call_method_n_kw(0, 0, dest);
+
+    while (!mp_obj_is_true(success)) {
+        RUN_BACKGROUND_TASKS;
+        if (mp_hal_is_interrupted()) {
+            break;
+        }
+
+        success = mp_call_method_n_kw(0, 0, dest);
+    }
+}
+
+void common_hal_adafruit_bus_device_i2cdevice_unlock(adafruit_bus_device_i2cdevice_obj_t *self) {
+    mp_obj_t dest[2];
+    mp_load_method(self->i2c, MP_QSTR_unlock, dest);
+    mp_call_method_n_kw(0, 0, dest);
+}
+
+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 write_bufinfo;
+    mp_obj_t write_buffer = mp_obj_new_bytearray_of_zeros(0);
+    mp_get_buffer_raise(write_buffer, &write_bufinfo, MP_BUFFER_READ);
+
+    mp_obj_t dest[4];
+
+    /* catch exceptions that may be thrown while probing for the device */
+    nlr_buf_t nlr;
+    if (nlr_push(&nlr) == 0) {
+        mp_load_method(self->i2c, MP_QSTR_writeto, dest);
+        dest[2] = MP_OBJ_NEW_SMALL_INT(self->device_address);
+        dest[3] = write_buffer;
+        mp_call_method_n_kw(2, 0, dest);
+        nlr_pop();
+    } else {
+        common_hal_adafruit_bus_device_i2cdevice_unlock(self);
+
+        if (mp_obj_is_subclass_fast(MP_OBJ_FROM_PTR(((mp_obj_base_t *)nlr.ret_val)->type), MP_OBJ_FROM_PTR(&mp_type_OSError))) {
+            mp_raise_ValueError_varg(translate("No I2C device at address: 0x%x"), self->device_address);
+        } else {
+            /* In case we receive an unrelated exception pass it up */
+            nlr_raise(MP_OBJ_FROM_PTR(nlr.ret_val));
+        }
+    }
+
+    common_hal_adafruit_bus_device_i2cdevice_unlock(self);
+}