mirror of https://github.com/ARMmbed/mbed-os.git
105 lines
2.9 KiB
C++
105 lines
2.9 KiB
C++
/* mbed Microcontroller Library
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* Copyright (c) 2006-2013 ARM Limited
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "Serial.h"
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#include "wait_api.h"
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#if DEVICE_SERIAL
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namespace mbed {
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Serial::Serial(PinName tx, PinName rx, const char *name) : Stream(name) {
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serial_init(&_serial, tx, rx);
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_baud = 9600;
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serial_irq_handler(&_serial, Serial::_irq_handler, (uint32_t)this);
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}
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void Serial::baud(int baudrate) {
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serial_baud(&_serial, baudrate);
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_baud = baudrate;
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}
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void Serial::format(int bits, Parity parity, int stop_bits) {
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serial_format(&_serial, bits, (SerialParity)parity, stop_bits);
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}
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int Serial::readable() {
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return serial_readable(&_serial);
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}
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int Serial::writeable() {
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return serial_writable(&_serial);
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}
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pFunctionPointer_t Serial::attach(void (*fptr)(void), IrqType type) {
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pFunctionPointer_t pf = NULL;
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_irq[type].clear();
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if (fptr) {
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pf = _irq[type].add(fptr);
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serial_irq_set(&_serial, (SerialIrq)type, 1);
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} else {
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serial_irq_set(&_serial, (SerialIrq)type, 0);
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}
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return pf;
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}
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pFunctionPointer_t Serial::add_handler_helper(void (*fptr)(void), IrqType type, bool front) {
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if (NULL == fptr)
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return NULL;
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pFunctionPointer_t pf = front ? _irq[type].add_front(fptr) : _irq[type].add(fptr);
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serial_irq_set(&_serial, (SerialIrq)type, 1);
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return pf;
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}
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bool Serial::remove_handler(pFunctionPointer_t pf, IrqType type) {
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bool res = _irq[type].remove(pf);
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if (res && _irq[type].size() == 0)
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serial_irq_set(&_serial, (SerialIrq)type, 0);
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return res;
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}
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void Serial::_irq_handler(uint32_t id, SerialIrq irq_type) {
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Serial *handler = (Serial*)id;
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handler->_irq[irq_type].call();
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}
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int Serial::_getc() {
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return serial_getc(&_serial);
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}
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int Serial::_putc(int c) {
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serial_putc(&_serial, c);
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return c;
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}
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void Serial::send_break() {
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// Wait for 1.5 frames before clearing the break condition
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// This will have different effects on our platforms, but should
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// ensure that we keep the break active for at least one frame.
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// We consider a full frame (1 start bit + 8 data bits bits +
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// 1 parity bit + 2 stop bits = 12 bits) for computation.
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// One bit time (in us) = 1000000/_baud
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// Twelve bits: 12000000/baud delay
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// 1.5 frames: 18000000/baud delay
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serial_break_set(&_serial);
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wait_us(18000000/_baud);
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serial_break_clear(&_serial);
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}
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} // namespace mbed
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#endif
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