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/* 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 "SerialBase.h"
#include "wait_api.h"
#if DEVICE_SERIAL
namespace mbed {
SerialBase::SerialBase(PinName tx, PinName rx) :
#if DEVICE_SERIAL_ASYNCH
_thunk_irq(this), _tx_usage(DMA_USAGE_NEVER),
_rx_usage(DMA_USAGE_NEVER),
#endif
_serial(), _baud(9600) {
serial_init(&_serial, tx, rx);
serial_irq_handler(&_serial, SerialBase::_irq_handler, (uint32_t)this);
}
void SerialBase::baud(int baudrate) {
serial_baud(&_serial, baudrate);
_baud = baudrate;
}
void SerialBase::format(int bits, Parity parity, int stop_bits) {
serial_format(&_serial, bits, (SerialParity)parity, stop_bits);
}
int SerialBase::readable() {
return serial_readable(&_serial);
}
int SerialBase::writeable() {
return serial_writable(&_serial);
}
void SerialBase::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 SerialBase::_irq_handler(uint32_t id, SerialIrq irq_type) {
SerialBase *handler = (SerialBase*)id;
handler->_irq[irq_type].call();
}
int SerialBase::_base_getc() {
return serial_getc(&_serial);
}
int SerialBase::_base_putc(int c) {
serial_putc(&_serial, c);
return c;
}
void SerialBase::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);
}
#if DEVICE_SERIAL_FC
void SerialBase::set_flow_control(Flow type, PinName flow1, PinName flow2) {
FlowControl flow_type = (FlowControl)type;
switch(type) {
case RTS:
serial_set_flow_control(&_serial, flow_type, flow1, NC);
break;
case CTS:
serial_set_flow_control(&_serial, flow_type, NC, flow1);
break;
case RTSCTS:
case Disabled:
serial_set_flow_control(&_serial, flow_type, flow1, flow2);
break;
default:
break;
}
}
#endif
#if DEVICE_SERIAL_ASYNCH
int SerialBase::write(const uint8_t *buffer, int length, const event_callback_t& callback, int event)
{
if (serial_tx_active(&_serial)) {
return -1; // transaction ongoing
}
start_write((void *)buffer, length, 8, callback, event);
return 0;
}
int SerialBase::write(const uint16_t *buffer, int length, const event_callback_t& callback, int event)
{
if (serial_tx_active(&_serial)) {
return -1; // transaction ongoing
}
start_write((void *)buffer, length, 16, callback, event);
return 0;
}
void SerialBase::start_write(const void *buffer, int buffer_size, char buffer_width, const event_callback_t& callback, int event)
{
_tx_callback = callback;
_thunk_irq.callback(&SerialBase::interrupt_handler_asynch);
serial_tx_asynch(&_serial, buffer, buffer_size, buffer_width, _thunk_irq.entry(), event, _tx_usage);
}
void SerialBase::abort_write(void)
{
serial_tx_abort_asynch(&_serial);
}
void SerialBase::abort_read(void)
{
serial_rx_abort_asynch(&_serial);
}
int SerialBase::set_dma_usage_tx(DMAUsage usage)
{
if (serial_tx_active(&_serial)) {
return -1;
}
_tx_usage = usage;
return 0;
}
int SerialBase::set_dma_usage_rx(DMAUsage usage)
{
if (serial_tx_active(&_serial)) {
return -1;
}
_rx_usage = usage;
return 0;
}
int SerialBase::read(uint8_t *buffer, int length, const event_callback_t& callback, int event, unsigned char char_match)
{
if (serial_rx_active(&_serial)) {
return -1; // transaction ongoing
}
start_read((void*)buffer, length, 8, callback, event, char_match);
return 0;
}
int SerialBase::read(uint16_t *buffer, int length, const event_callback_t& callback, int event, unsigned char char_match)
{
if (serial_rx_active(&_serial)) {
return -1; // transaction ongoing
}
start_read((void*)buffer, length, 16, callback, event, char_match);
return 0;
}
void SerialBase::start_read(void *buffer, int buffer_size, char buffer_width, const event_callback_t& callback, int event, unsigned char char_match)
{
_rx_callback = callback;
_thunk_irq.callback(&SerialBase::interrupt_handler_asynch);
serial_rx_asynch(&_serial, buffer, buffer_size, buffer_width, _thunk_irq.entry(), event, char_match, _rx_usage);
}
void SerialBase::interrupt_handler_asynch(void)
{
int event = serial_irq_handler_asynch(&_serial);
int rx_event = event & SERIAL_EVENT_RX_MASK;
if (_rx_callback && rx_event) {
_rx_callback.call(rx_event);
}
int tx_event = event & SERIAL_EVENT_TX_MASK;
if (_tx_callback && tx_event) {
_tx_callback.call(tx_event);
}
}
#endif
} // namespace mbed
#endif