Diff: DevI2C-js.cpp

Revision:

0:948fd0e96aaa

Child:

1:9004b187e772

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DevI2C-js.cpp	Wed Oct 25 13:45:51 2017 +0200
@@ -0,0 +1,323 @@
+/* Copyright JS Foundation and other contributors, http://js.foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include "jerryscript-mbed-util/logging.h"
+#include "jerryscript-mbed-library-registry/wrap_tools.h"
+
+#include "DevI2C.h"
+
+#include "mbed.h"
+
+/**
+ * DevI2C#destructor
+ *
+ * Called if/when the DevI2C object is GC'ed.
+ */
+void NAME_FOR_CLASS_NATIVE_DESTRUCTOR(DevI2C) (void *void_ptr) {
+    delete static_cast<DevI2C*>(void_ptr);
+}
+
+/**
+ * Type infomation of the native DevI2C pointer
+ *
+ * Set DevI2C#destructor as the free callback.
+ */
+static const jerry_object_native_info_t native_obj_type_info = {
+    .free_cb = NAME_FOR_CLASS_NATIVE_DESTRUCTOR(DevI2C)
+};
+
+/**
+ * DevI2C#frequency (native JavaScript method)
+ *
+ * Set the frequency of the DevI2C bus.
+ *
+ * @param frequency New DevI2C Frequency
+ */
+DECLARE_CLASS_FUNCTION(DevI2C, frequency) {
+    CHECK_ARGUMENT_COUNT(DevI2C, frequency, (args_count == 1));
+    CHECK_ARGUMENT_TYPE_ALWAYS(DevI2C, frequency, 0, number);
+
+    // Unwrap native DevI2C object
+    void *void_ptr;
+    const jerry_object_native_info_t *type_ptr;
+    bool has_ptr = jerry_get_object_native_pointer(this_obj, &void_ptr, &type_ptr);
+
+    if (!has_ptr || type_ptr != &native_obj_type_info) {
+        return jerry_create_error(JERRY_ERROR_TYPE,
+                                  (const jerry_char_t *) "Failed to get native DevI2C pointer");
+    }
+
+    I2C *native_ptr = static_cast<I2C*>(void_ptr);
+
+    int hz = jerry_get_number_value(args[0]);
+    native_ptr->frequency(hz);
+
+    return jerry_create_undefined();
+}
+
+/**
+ * DevI2C#read (native JavaScript method)
+ *
+ * Read data from the DevI2C bus.
+ *
+ * @overload DevI2C#read(int)
+ * Read a single byte from the DevI2C bus
+ *
+ * @param ack indicates if the byte is to be acknowledged (1 => acknowledge)
+ *
+ * @returns array: Data read from the DevI2C bus
+ *
+ * @overload DevI2C#read(int, array, int)
+ * Read a series of bytes from the DevI2C bus
+ *
+ * @param address DevI2C address to read from
+ * @param data Array to read into
+ * @param length Length of data to read
+ *
+ * @returns array: Data read from the DevI2C bus
+ */
+DECLARE_CLASS_FUNCTION(DevI2C, read) {
+    CHECK_ARGUMENT_COUNT(DevI2C, read, (args_count == 1 || args_count == 3 || args_count == 4));
+
+    if (args_count == 1) {
+        CHECK_ARGUMENT_TYPE_ALWAYS(DevI2C, read, 0, number);
+        void *void_ptr;
+        const jerry_object_native_info_t *type_ptr;
+        bool has_ptr = jerry_get_object_native_pointer(this_obj, &void_ptr, &type_ptr);
+
+        if (!has_ptr || type_ptr != &native_obj_type_info) {
+            return jerry_create_error(JERRY_ERROR_TYPE,
+                                      (const jerry_char_t *) "Failed to get native DevI2C pointer");
+        }
+
+        I2C *native_ptr = static_cast<I2C*>(void_ptr);
+
+        int data = jerry_get_number_value(args[0]);
+        int result = native_ptr->read(data);
+
+        return jerry_create_number(result);
+    } else {
+        CHECK_ARGUMENT_TYPE_ALWAYS(DevI2C, read, 0, number);
+        CHECK_ARGUMENT_TYPE_ALWAYS(DevI2C, read, 1, array);
+        CHECK_ARGUMENT_TYPE_ALWAYS(DevI2C, read, 2, number);
+
+        CHECK_ARGUMENT_TYPE_ON_CONDITION(DevI2C, read, 3, boolean, (args_count == 4));
+
+        void *void_ptr;
+        const jerry_object_native_info_t *type_ptr;
+        bool has_ptr = jerry_get_object_native_pointer(this_obj, &void_ptr, &type_ptr);
+
+        if (!has_ptr || type_ptr != &native_obj_type_info) {
+            return jerry_create_error(JERRY_ERROR_TYPE,
+                                      (const jerry_char_t *) "Failed to get native DevI2C pointer");
+        }
+
+        I2C *native_ptr = static_cast<I2C*>(void_ptr);
+
+        const uint32_t data_len = jerry_get_array_length(args[1]);
+
+        int address = jerry_get_number_value(args[0]);
+        int length = jerry_get_number_value(args[2]);
+
+        char *data = new char[data_len];
+
+        bool repeated = false;
+        if (args_count == 4) {
+            repeated = jerry_get_boolean_value(args[3]);
+        }
+
+        int result = native_ptr->read(address, data, length, repeated);
+
+        jerry_value_t out_array = jerry_create_array(data_len);
+
+        for (uint32_t i = 0; i < data_len; i++) {
+            jerry_value_t val = jerry_create_number(double(data[i]));
+            jerry_set_property_by_index(out_array, i, val);
+            jerry_release_value(val);
+        }
+
+        delete[] data;
+
+        if (result == 0) {
+            // ACK
+            return out_array;
+        } else {
+            // NACK
+            const char *error_msg = "NACK received from DevI2C bus";
+
+            jerry_release_value(out_array);
+            return jerry_create_error(JERRY_ERROR_COMMON, reinterpret_cast<const jerry_char_t *>(error_msg));
+        }
+    }
+}
+
+/**
+ * DevI2C#write (native JavaScript method)
+ *
+ * @overload DevI2C#write(int)
+ * Write a single byte to the DevI2C bus
+ *
+ * @param data Data byte to write to the DevI2C bus
+ *
+ * @returns 1 on success, 0 on failure
+ *
+ * @overload DevI2C#write(int, array, int, bool)
+ * Write an array of data to a certain address on the DevI2C bus
+ *
+ * @param address 8-bit DevI2C slave address
+ * @param data Array of bytes to send
+ * @param length Length of data to write
+ * @param repeated (optional) If true, do not send stop at end.
+ *
+ * @returns 0 on success, non-0 on failure
+ */
+DECLARE_CLASS_FUNCTION(DevI2C, write) {
+    CHECK_ARGUMENT_COUNT(DevI2C, write, (args_count == 1 || args_count == 3 || args_count == 4));
+
+    if (args_count == 1) {
+        CHECK_ARGUMENT_TYPE_ALWAYS(DevI2C, write, 0, number);
+
+        // Extract native DevI2C object
+        void *void_ptr;
+        const jerry_object_native_info_t *type_ptr;
+        bool has_ptr = jerry_get_object_native_pointer(this_obj, &void_ptr, &type_ptr);
+
+        if (!has_ptr || type_ptr != &native_obj_type_info) {
+            return jerry_create_error(JERRY_ERROR_TYPE,
+                                      (const jerry_char_t *) "Failed to get native DevI2C pointer");
+        }
+
+        I2C *native_ptr = static_cast<I2C*>(void_ptr);
+
+        // Unwrap arguments
+        int data = jerry_get_number_value(args[0]);
+
+        int result = native_ptr->write(data);
+        return jerry_create_number(result);
+    } else {
+        // 3 or 4
+        CHECK_ARGUMENT_TYPE_ALWAYS(DevI2C, write, 0, number);
+        CHECK_ARGUMENT_TYPE_ALWAYS(DevI2C, write, 1, array);
+        CHECK_ARGUMENT_TYPE_ALWAYS(DevI2C, write, 2, number);
+        CHECK_ARGUMENT_TYPE_ON_CONDITION(DevI2C, write, 3, boolean, (args_count == 4));
+
+        // Extract native DevI2C object
+        void *void_ptr;
+        const jerry_object_native_info_t *type_ptr;
+        bool has_ptr = jerry_get_object_native_pointer(this_obj, &void_ptr, &type_ptr);
+
+        if (!has_ptr || type_ptr != &native_obj_type_info) {
+            return jerry_create_error(JERRY_ERROR_TYPE,
+                                      (const jerry_char_t *) "Failed to get native DevI2C pointer");
+        }
+
+        I2C *native_ptr = static_cast<I2C*>(void_ptr);
+
+        // Unwrap arguments
+        int address = jerry_get_number_value(args[0]);
+        const uint32_t data_len = jerry_get_array_length(args[1]);
+        int length = jerry_get_number_value(args[2]);
+        bool repeated = args_count == 4 && jerry_get_boolean_value(args[3]);
+
+        // Construct data byte array
+        char *data = new char[data_len];
+        for (uint32_t i = 0; i < data_len; i++) {
+            data[i] = jerry_get_number_value(jerry_get_property_by_index(args[1], i));
+        }
+
+        int result = native_ptr->write(address, data, length, repeated);
+
+        // free dynamically allocated resources
+        delete[] data;
+
+        return jerry_create_number(result);
+    }
+}
+
+/**
+ * DevI2C#start (native JavaScript method)
+ *
+ * Creates a start condition on the DevI2C bus.
+ */
+DECLARE_CLASS_FUNCTION(DevI2C, start) {
+    CHECK_ARGUMENT_COUNT(DevI2C, start, (args_count == 0));
+
+    // Extract native DevI2C object
+    void *void_ptr;
+    const jerry_object_native_info_t *type_ptr;
+    bool has_ptr = jerry_get_object_native_pointer(this_obj, &void_ptr, &type_ptr);
+
+    if (!has_ptr || type_ptr != &native_obj_type_info) {
+        return jerry_create_error(JERRY_ERROR_TYPE,
+                                  (const jerry_char_t *) "Failed to get native DevI2C pointer");
+    }
+
+    I2C *native_ptr = static_cast<I2C*>(void_ptr);
+
+    native_ptr->start();
+    return jerry_create_undefined();
+}
+
+/**
+ * DevI2C#stop (native JavaScript method)
+ *
+ * Creates a stop condition on the DevI2C bus.
+ */
+DECLARE_CLASS_FUNCTION(DevI2C, stop) {
+    CHECK_ARGUMENT_COUNT(DevI2C, stop, (args_count == 0));
+
+    // Extract native DevI2C object
+    void *void_ptr;
+    const jerry_object_native_info_t *type_ptr;
+    bool has_ptr = jerry_get_object_native_pointer(this_obj, &void_ptr, &type_ptr);
+
+    if (!has_ptr || type_ptr != &native_obj_type_info) {
+        return jerry_create_error(JERRY_ERROR_TYPE,
+                                  (const jerry_char_t *) "Failed to get native DevI2C pointer");
+    }
+
+    I2C *native_ptr = static_cast<I2C*>(void_ptr);
+
+    native_ptr->stop();
+    return jerry_create_undefined();
+}
+
+/**
+ * DevI2C (native JavaScript constructor)
+ *
+ * @param sda mbed pin for DevI2C data
+ * @param scl mbed pin for DevI2C clock
+ * @returns a JavaScript object representing the DevI2C bus.
+ */
+DECLARE_CLASS_CONSTRUCTOR(DevI2C) {
+    CHECK_ARGUMENT_COUNT(DevI2C, __constructor, (args_count == 2));
+    CHECK_ARGUMENT_TYPE_ALWAYS(DevI2C, __constructor, 0, number);
+    CHECK_ARGUMENT_TYPE_ALWAYS(DevI2C, __constructor, 1, number);
+
+    int sda = jerry_get_number_value(args[0]);
+    int scl = jerry_get_number_value(args[1]);
+
+    DevI2C *native_ptr = new DevI2C((PinName)sda, (PinName)scl);
+
+    jerry_value_t js_object = jerry_create_object();
+    jerry_set_object_native_pointer(js_object, native_ptr, &native_obj_type_info);
+
+    ATTACH_CLASS_FUNCTION(js_object, DevI2C, frequency);
+    ATTACH_CLASS_FUNCTION(js_object, DevI2C, read);
+    ATTACH_CLASS_FUNCTION(js_object, DevI2C, write);
+    ATTACH_CLASS_FUNCTION(js_object, DevI2C, start);
+    ATTACH_CLASS_FUNCTION(js_object, DevI2C, stop);
+
+    return js_object;
+}