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139 lines
3.7 KiB
C++
139 lines
3.7 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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// 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 = US_MR_USART_MODE_NORMAL | US_MR_USCLKS_MCK | US_MR_CHRL_8_BIT | US_MR_PAR_NO |
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US_MR_NBSTOP_1_BIT | US_MR_CHMODE_NORMAL;
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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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