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d02fde6e37
Adds ability to set length, parity and stop bit configuration to hardware serial ports using USART module (Serial1, Serial2, and Serial 3) on Due to allow compatibility with avr devices.
144 lines
3.6 KiB
C++
144 lines
3.6 KiB
C++
/*
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Copyright (c) 2011 Arduino. All right reserved.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include "USARTClass.h"
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// Constructors ////////////////////////////////////////////////////////////////
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USARTClass::USARTClass( Usart* pUsart, IRQn_Type dwIrq, uint32_t dwId, RingBuffer* pRx_buffer )
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{
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_rx_buffer = pRx_buffer ;
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_pUsart=pUsart ;
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_dwIrq=dwIrq ;
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_dwId=dwId ;
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}
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// Public Methods //////////////////////////////////////////////////////////////
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void USARTClass::begin( const uint32_t dwBaudRate )
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{
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begin( dwBaudRate, SERIAL_8N1 );
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}
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void USARTClass::begin( const uint32_t dwBaudRate, const uint32_t config )
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{
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// Configure PMC
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pmc_enable_periph_clk( _dwId ) ;
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// Disable PDC channel
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_pUsart->US_PTCR = US_PTCR_RXTDIS | US_PTCR_TXTDIS ;
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// Reset and disable receiver and transmitter
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_pUsart->US_CR = US_CR_RSTRX | US_CR_RSTTX | US_CR_RXDIS | US_CR_TXDIS ;
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// Configure mode
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_pUsart->US_MR = config;
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// Configure baudrate, asynchronous no oversampling
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_pUsart->US_BRGR = (SystemCoreClock / dwBaudRate) / 16 ;
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// Configure interrupts
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_pUsart->US_IDR = 0xFFFFFFFF;
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_pUsart->US_IER = US_IER_RXRDY | US_IER_OVRE | US_IER_FRAME;
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// Enable UART interrupt in NVIC
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NVIC_EnableIRQ( _dwIrq ) ;
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// Enable receiver and transmitter
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_pUsart->US_CR = US_CR_RXEN | US_CR_TXEN ;
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}
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void USARTClass::end( void )
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{
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// clear any received data
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_rx_buffer->_iHead = _rx_buffer->_iTail ;
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// Disable UART interrupt in NVIC
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NVIC_DisableIRQ( _dwIrq ) ;
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// Wait for any outstanding data to be sent
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flush();
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pmc_disable_periph_clk( _dwId ) ;
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}
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int USARTClass::available( void )
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{
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return (uint32_t)(SERIAL_BUFFER_SIZE + _rx_buffer->_iHead - _rx_buffer->_iTail) % SERIAL_BUFFER_SIZE ;
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}
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int USARTClass::peek( void )
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{
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if ( _rx_buffer->_iHead == _rx_buffer->_iTail )
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return -1 ;
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return _rx_buffer->_aucBuffer[_rx_buffer->_iTail] ;
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}
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int USARTClass::read( void )
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{
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// if the head isn't ahead of the tail, we don't have any characters
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if ( _rx_buffer->_iHead == _rx_buffer->_iTail )
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return -1 ;
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uint8_t uc = _rx_buffer->_aucBuffer[_rx_buffer->_iTail] ;
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_rx_buffer->_iTail = (unsigned int)(_rx_buffer->_iTail + 1) % SERIAL_BUFFER_SIZE ;
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return uc ;
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}
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void USARTClass::flush( void )
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{
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// Wait for transmission to complete
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while ((_pUsart->US_CSR & US_CSR_TXRDY) != US_CSR_TXRDY)
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;
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}
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size_t USARTClass::write( const uint8_t uc_data )
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{
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// Check if the transmitter is ready
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while ((_pUsart->US_CSR & US_CSR_TXRDY) != US_CSR_TXRDY)
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;
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// Send character
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_pUsart->US_THR = uc_data ;
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return 1;
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}
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void USARTClass::IrqHandler( void )
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{
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uint32_t status = _pUsart->US_CSR;
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// Did we receive data ?
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if ((status & US_CSR_RXRDY) == US_CSR_RXRDY)
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_rx_buffer->store_char( _pUsart->US_RHR ) ;
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// Acknowledge errors
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if ((status & US_CSR_OVRE) == US_CSR_OVRE ||
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(status & US_CSR_FRAME) == US_CSR_FRAME)
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{
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// TODO: error reporting outside ISR
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_pUsart->US_CR |= US_CR_RSTSTA;
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}
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}
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