Diff: common/Serial.cpp

Revision:

13:0645d8841f51

Parent:

10:3bc89ef62ce7

Child:

15:4892fe388435

--- a/common/Serial.cpp	Wed Jul 24 11:11:21 2013 +0100
+++ b/common/Serial.cpp	Mon Aug 05 14:12:34 2013 +0300
@@ -1,70 +1,87 @@
-/* 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 "Serial.h"
-
-#if DEVICE_SERIAL
-
-namespace mbed {
-
-Serial::Serial(PinName tx, PinName rx, const char *name) : Stream(name) {
-    serial_init(&_serial, tx, rx);
-    serial_irq_handler(&_serial, Serial::_irq_handler, (uint32_t)this);
-}
-
-void Serial::baud(int baudrate) {
-    serial_baud(&_serial, baudrate);
-}
-
-void Serial::format(int bits, Parity parity, int stop_bits) {
-    serial_format(&_serial, bits, (SerialParity)parity, stop_bits);
-}
-
-int Serial::readable() {
-    return serial_readable(&_serial);
-}
-
-
-int Serial::writeable() {
-    return serial_writable(&_serial);
-}
-
-void Serial::attach(void (*fptr)(void), IrqType type) {
-    if (fptr) {
-        _irq[type].attach(fptr);
-        serial_irq_set(&_serial, (SerialIrq)type, 1);
-    } else {
-        serial_irq_set(&_serial, (SerialIrq)type, 0);
-    }
-}
-
-
-void Serial::_irq_handler(uint32_t id, SerialIrq irq_type) {
-    Serial *handler = (Serial*)id;
-    handler->_irq[irq_type].call();
-}
-
-int Serial::_getc() {
-    return serial_getc(&_serial);
-}
-
-int Serial::_putc(int c) {
-    serial_putc(&_serial, c);
-    return c;
-}
-
-} // namespace mbed
-
-#endif
+/* 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 "Serial.h"
+#include "wait_api.h"
+
+#if DEVICE_SERIAL
+
+namespace mbed {
+
+Serial::Serial(PinName tx, PinName rx, const char *name) : Stream(name) {
+    serial_init(&_serial, tx, rx);
+    _baud = 9600;
+    serial_irq_handler(&_serial, Serial::_irq_handler, (uint32_t)this);
+}
+
+void Serial::baud(int baudrate) {
+    serial_baud(&_serial, baudrate);
+    _baud = baudrate;
+}
+
+void Serial::format(int bits, Parity parity, int stop_bits) {
+    serial_format(&_serial, bits, (SerialParity)parity, stop_bits);
+}
+
+int Serial::readable() {
+    return serial_readable(&_serial);
+}
+
+
+int Serial::writeable() {
+    return serial_writable(&_serial);
+}
+
+void Serial::attach(void (*fptr)(void), IrqType type) {
+    if (fptr) {
+        _irq[type].attach(fptr);
+        serial_irq_set(&_serial, (SerialIrq)type, 1);
+    } else {
+        serial_irq_set(&_serial, (SerialIrq)type, 0);
+    }
+}
+
+
+void Serial::_irq_handler(uint32_t id, SerialIrq irq_type) {
+    Serial *handler = (Serial*)id;
+    handler->_irq[irq_type].call();
+}
+
+int Serial::_getc() {
+    return serial_getc(&_serial);
+}
+
+int Serial::_putc(int c) {
+    serial_putc(&_serial, c);
+    return c;
+}
+
+void Serial::send_break() {
+  // Wait for 1.5 frames before clearing the break condition
+  // This will have different effects on our platforms, but should
+  // ensure that we keep the break active for at least one frame.
+  // We consider a full frame (1 start bit + 8 data bits bits + 
+  // 1 parity bit + 2 stop bits = 12 bits) for computation.
+  // One bit time (in us) = 1000000/_baud
+  // Twelve bits: 12000000/baud delay
+  // 1.5 frames: 18000000/baud delay
+  serial_break_set(&_serial);
+  wait_us(18000000/_baud);
+  serial_break_clear(&_serial);
+}
+
+} // namespace mbed
+
+#endif