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 // for 030F4 flow control not implemented (N.S.)
00020 #undef DEVICE_SERIAL_FC
00021 
00022 #if DEVICE_SERIAL
00023 
00024 namespace mbed {
00025 
00026 SerialBase::SerialBase(PinName tx, PinName rx) : _serial(), _baud(9600) {
00027     serial_init(&_serial, tx, rx);
00028     serial_irq_handler(&_serial, SerialBase::_irq_handler, (uint32_t)this);
00029 }
00030 
00031 void SerialBase::baud(int baudrate) {
00032     serial_baud(&_serial, baudrate);
00033     _baud = baudrate;
00034 }
00035 
00036 void SerialBase::format(int bits, Parity parity, int stop_bits) {
00037     serial_format(&_serial, bits, (SerialParity)parity, stop_bits);
00038 }
00039 
00040 int SerialBase::readable() {
00041     return serial_readable(&_serial);
00042 }
00043 
00044 
00045 int SerialBase::writeable() {
00046     return serial_writable(&_serial);
00047 }
00048 
00049 void SerialBase::attach(void (*fptr)(void), IrqType type) {
00050     if (fptr) {
00051         _irq[type].attach(fptr);
00052         serial_irq_set(&_serial, (SerialIrq)type, 1);
00053     } else {
00054         serial_irq_set(&_serial, (SerialIrq)type, 0);
00055     }
00056 }
00057 
00058 void SerialBase::_irq_handler(uint32_t id, SerialIrq irq_type) {
00059     SerialBase *handler = (SerialBase*)id;
00060     handler->_irq[irq_type].call();
00061 }
00062 
00063 int SerialBase::_base_getc() {
00064     return serial_getc(&_serial);
00065 }
00066 
00067 int SerialBase::_base_putc(int c) {
00068     serial_putc(&_serial, c);
00069     return c;
00070 }
00071 
00072 void SerialBase::send_break() {
00073   // Wait for 1.5 frames before clearing the break condition
00074   // This will have different effects on our platforms, but should
00075   // ensure that we keep the break active for at least one frame.
00076   // We consider a full frame (1 start bit + 8 data bits bits +
00077   // 1 parity bit + 2 stop bits = 12 bits) for computation.
00078   // One bit time (in us) = 1000000/_baud
00079   // Twelve bits: 12000000/baud delay
00080   // 1.5 frames: 18000000/baud delay
00081   serial_break_set(&_serial);
00082   wait_us(18000000/_baud);
00083   serial_break_clear(&_serial);
00084 }
00085 
00086 #if DEVICE_SERIAL_FC
00087 void SerialBase::set_flow_control(Flow type, PinName flow1, PinName flow2) {
00088     FlowControl flow_type = (FlowControl)type;
00089     switch(type) {
00090         case RTS:
00091             serial_set_flow_control(&_serial, flow_type, flow1, NC);
00092             break;
00093 
00094         case CTS:
00095             serial_set_flow_control(&_serial, flow_type, NC, flow1);
00096             break;
00097 
00098         case RTSCTS:
00099         case Disabled:
00100             serial_set_flow_control(&_serial, flow_type, flow1, flow2);
00101             break;
00102 
00103         default:
00104             break;
00105     }
00106 }
00107 #endif
00108 
00109 } // namespace mbed
00110 
00111 #endif