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reprapfirmware-dc42/ArduinoCorePatches/sam/cores/arduino/UARTClass.cpp
David Crocker 09943e1cb7 Version 0.78s alpha
Added support for nozzle offsets in G10 command
Disable heater timeout if the time limit is set to zero or negative
Don't send non-error responses to the web interface unless the
corresponding command also came from the web interface
Added support for aux input from serial. Need to finish this by making
serial transmission interrupt-driven.
2014-09-12 17:55:33 +01:00

142 lines
3.7 KiB
C++

/*
Copyright (c) 2011 Arduino. All right reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "UARTClass.h"
// Constructors ////////////////////////////////////////////////////////////////
UARTClass::UARTClass( Uart* pUart, IRQn_Type dwIrq, uint32_t dwId, RingBuffer* pRx_buffer )
{
_rx_buffer = pRx_buffer ;
_pUart=pUart ;
_dwIrq=dwIrq ;
_dwId=dwId ;
}
// Public Methods //////////////////////////////////////////////////////////////
void UARTClass::begin( const uint32_t dwBaudRate )
{
// Configure PMC
pmc_enable_periph_clk( _dwId ) ;
// Disable PDC channel
_pUart->UART_PTCR = UART_PTCR_RXTDIS | UART_PTCR_TXTDIS ;
// Reset and disable receiver and transmitter
_pUart->UART_CR = UART_CR_RSTRX | UART_CR_RSTTX | UART_CR_RXDIS | UART_CR_TXDIS ;
// Configure mode
_pUart->UART_MR = UART_MR_PAR_NO | UART_MR_CHMODE_NORMAL ;
// Configure baudrate (asynchronous, no oversampling)
_pUart->UART_BRGR = (SystemCoreClock / dwBaudRate) >> 4 ;
// Configure interrupts
_pUart->UART_IDR = 0xFFFFFFFF;
_pUart->UART_IER = UART_IER_RXRDY | UART_IER_OVRE | UART_IER_FRAME;
// Enable UART interrupt in NVIC
NVIC_EnableIRQ(_dwIrq);
// Enable receiver and transmitter
_pUart->UART_CR = UART_CR_RXEN | UART_CR_TXEN ;
}
void UARTClass::end( void )
{
// clear any received data
_rx_buffer->_iHead = _rx_buffer->_iTail ;
// Disable UART interrupt in NVIC
NVIC_DisableIRQ( _dwIrq ) ;
// Wait for any outstanding data to be sent
flush();
pmc_disable_periph_clk( _dwId ) ;
}
int UARTClass::available( void )
{
return (uint32_t)(SERIAL_BUFFER_SIZE + _rx_buffer->_iHead - _rx_buffer->_iTail) % SERIAL_BUFFER_SIZE ;
}
int UARTClass::peek( void )
{
if ( _rx_buffer->_iHead == _rx_buffer->_iTail )
return -1 ;
return _rx_buffer->_aucBuffer[_rx_buffer->_iTail] ;
}
int UARTClass::read( void )
{
// if the head isn't ahead of the tail, we don't have any characters
if ( _rx_buffer->_iHead == _rx_buffer->_iTail )
return -1 ;
uint8_t uc = _rx_buffer->_aucBuffer[_rx_buffer->_iTail] ;
_rx_buffer->_iTail = (unsigned int)(_rx_buffer->_iTail + 1) % SERIAL_BUFFER_SIZE ;
return uc ;
}
void UARTClass::flush( void )
{
// Wait for transmission to complete
while ((_pUart->UART_SR & UART_SR_TXRDY) != UART_SR_TXRDY)
;
}
size_t UARTClass::write( const uint8_t uc_data )
{
// Check if the transmitter is ready
while ((_pUart->UART_SR & UART_SR_TXRDY) != UART_SR_TXRDY)
;
// Send character
_pUart->UART_THR = uc_data;
return 1;
}
size_t UARTClass::canWrite( void ) const //***** DC42 added
{
return (_pUart->UART_SR & UART_SR_TXRDY) ? 1 : 0;
}
void UARTClass::IrqHandler( void )
{
uint32_t status = _pUart->UART_SR;
// Did we receive data ?
if ((status & UART_SR_RXRDY) == UART_SR_RXRDY)
_rx_buffer->store_char(_pUart->UART_RHR);
// Acknowledge errors
if ((status & UART_SR_OVRE) == UART_SR_OVRE ||
(status & UART_SR_FRAME) == UART_SR_FRAME)
{
// TODO: error reporting outside ISR
_pUart->UART_CR |= UART_CR_RSTSTA;
}
}