SerialBase.cpp

00001 /* mbed Microcontroller Library
00002  * Copyright (c) 2006-2013 ARM Limited
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *     http://www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 #include "SerialBase.h"
00017 #include "wait_api.h"
00018 
00019 #if DEVICE_SERIAL
00020 
00021 namespace mbed {
00022 
00023 SerialBase::SerialBase(PinName tx, PinName rx) {
00024     serial_init(&_serial, tx, rx);
00025     _baud = 9600;
00026     serial_irq_handler(&_serial, SerialBase::_irq_handler, (uint32_t)this);
00027 }
00028 
00029 void SerialBase::baud(int baudrate) {
00030     serial_baud(&_serial, baudrate);
00031     _baud = baudrate;
00032 }
00033 
00034 void SerialBase::format(int bits, Parity parity, int stop_bits) {
00035     serial_format(&_serial, bits, (SerialParity)parity, stop_bits);
00036 }
00037 
00038 int SerialBase::readable() {
00039     return serial_readable(&_serial);
00040 }
00041 
00042 
00043 int SerialBase::writeable() {
00044     return serial_writable(&_serial);
00045 }
00046 
00047 void SerialBase::attach(void (*fptr)(void), IrqType type) {
00048     if (fptr) {
00049         _irq[type].attach(fptr);
00050         serial_irq_set(&_serial, (SerialIrq)type, 1);
00051     } else {
00052         serial_irq_set(&_serial, (SerialIrq)type, 0);
00053     }
00054 }
00055 
00056 void SerialBase::_irq_handler(uint32_t id, SerialIrq irq_type) {
00057     SerialBase *handler = (SerialBase*)id;
00058     handler->_irq[irq_type].call();
00059 }
00060 
00061 int SerialBase::_base_getc() {
00062     return serial_getc(&_serial);
00063 }
00064 
00065 int SerialBase::_base_putc(int c) {
00066     serial_putc(&_serial, c);
00067     return c;
00068 }
00069 
00070 void SerialBase::send_break() {
00071   // Wait for 1.5 frames before clearing the break condition
00072   // This will have different effects on our platforms, but should
00073   // ensure that we keep the break active for at least one frame.
00074   // We consider a full frame (1 start bit + 8 data bits bits + 
00075   // 1 parity bit + 2 stop bits = 12 bits) for computation.
00076   // One bit time (in us) = 1000000/_baud
00077   // Twelve bits: 12000000/baud delay
00078   // 1.5 frames: 18000000/baud delay
00079   serial_break_set(&_serial);
00080   wait_us(18000000/_baud);
00081   serial_break_clear(&_serial);
00082 }
00083 
00084 #ifdef DEVICE_SERIAL_FC
00085 void SerialBase::set_flow_control(Flow type, PinName flow1, PinName flow2) {
00086     FlowControl flow_type = (FlowControl)type;
00087     switch(type) {
00088         case RTS:
00089             serial_set_flow_control(&_serial, flow_type, flow1, NC);
00090             break;
00091             
00092         case CTS:
00093             serial_set_flow_control(&_serial, flow_type, NC, flow1);
00094             break;
00095             
00096         case RTSCTS:
00097         case Disabled:
00098             serial_set_flow_control(&_serial, flow_type, flow1, flow2);
00099             break;
00100             
00101         default:
00102             break;
00103     }
00104 }
00105 #endif
00106 
00107 } // namespace mbed
00108 
00109 #endif