Diff: mbed-os/drivers/RawSerial.cpp

Revision:

0:9fca2b23d0ba

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-os/drivers/RawSerial.cpp	Sat Feb 23 12:13:36 2019 +0000
@@ -0,0 +1,95 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2013 ARM Limited
+ *
+ * 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 "drivers/RawSerial.h"
+#include "platform/mbed_wait_api.h"
+#include <stdio.h>
+#include <cstdarg>
+
+
+#if DEVICE_SERIAL
+
+#define STRING_STACK_LIMIT    120
+
+namespace mbed {
+
+RawSerial::RawSerial(PinName tx, PinName rx, int baud) : SerialBase(tx, rx, baud) {
+    // No lock needed in the constructor
+}
+
+int RawSerial::getc() {
+    lock();
+    int ret = _base_getc();
+    unlock();
+    return ret;
+}
+
+int RawSerial::putc(int c) {
+    lock();
+    int ret = _base_putc(c);
+    unlock();
+    return ret;
+}
+
+int RawSerial::puts(const char *str) {
+    lock();
+    while (*str)
+        putc(*str ++);
+    unlock();
+    return 0;
+}
+
+// Experimental support for printf in RawSerial. No Stream inheritance
+// means we can't call printf() directly, so we use sprintf() instead.
+// We only call malloc() for the sprintf() buffer if the buffer
+// length is above a certain threshold, otherwise we use just the stack.
+int RawSerial::printf(const char *format, ...) {
+    lock();
+    std::va_list arg;
+    va_start(arg, format);
+    // ARMCC microlib does not properly handle a size of 0.
+    // As a workaround supply a dummy buffer with a size of 1.
+    char dummy_buf[1];
+    int len = vsnprintf(dummy_buf, sizeof(dummy_buf), format, arg);
+    if (len < STRING_STACK_LIMIT) {
+        char temp[STRING_STACK_LIMIT];
+        vsprintf(temp, format, arg);
+        puts(temp);
+    } else {
+        char *temp = new char[len + 1];
+        vsprintf(temp, format, arg);
+        puts(temp);
+        delete[] temp;
+    }
+    va_end(arg);
+    unlock();
+    return len;
+}
+
+/** Acquire exclusive access to this serial port
+ */
+void RawSerial::lock() {
+    // No lock used - external synchronization required
+}
+
+/** Release exclusive access to this serial port
+ */
+void RawSerial::unlock() {
+    // No lock used - external synchronization required
+}
+
+} // namespace mbed
+
+#endif