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/* ----------------------------------------------------------------------------
* ATMEL Microcontroller Software Support
* ----------------------------------------------------------------------------
* Copyright (c) 2008, Atmel Corporation
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the disclaimer below.
*
* Atmel's name may not be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
* DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
* ----------------------------------------------------------------------------
*/
//------------------------------------------------------------------------------
// Headers
//------------------------------------------------------------------------------
#include "dbgu.h"
#include <board.h>
//------------------------------------------------------------------------------
// Global functions
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
/// Initializes the DBGU with the given parameters, and enables both the
/// transmitter and the receiver. The mode parameter contains the value of the
/// DBGU_MR register.
/// Value DBGU_STANDARD can be used for mode to get the most common configuration
/// (i.e. aysnchronous, 8bits, no parity, 1 stop bit, no flow control).
/// \param mode Operating mode to configure.
/// \param baudrate Desired baudrate (e.g. 115200).
/// \param mck Frequency of the system master clock in Hz.
//------------------------------------------------------------------------------
void DBGU_Configure(
unsigned int mode,
unsigned int baudrate,
unsigned int mck)
{
#if defined(cortexm3)
// Enable clock for UART
AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_DBGU);
#endif
// Reset & disable receiver and transmitter, disable interrupts
AT91C_BASE_DBGU->DBGU_CR = AT91C_US_RSTRX | AT91C_US_RSTTX;
AT91C_BASE_DBGU->DBGU_IDR = 0xFFFFFFFF;
// Configure baud rate
AT91C_BASE_DBGU->DBGU_BRGR = mck / (baudrate * 16);
// Configure mode register
AT91C_BASE_DBGU->DBGU_MR = mode;
// Disable DMA channel
AT91C_BASE_DBGU->DBGU_PTCR = AT91C_PDC_RXTDIS | AT91C_PDC_TXTDIS;
// Enable receiver and transmitter
AT91C_BASE_DBGU->DBGU_CR = AT91C_US_RXEN | AT91C_US_TXEN;
}
//------------------------------------------------------------------------------
/// Outputs a character on the DBGU line.
/// \note This function is synchronous (i.e. uses polling).
/// \param c Character to send.
//------------------------------------------------------------------------------
void DBGU_PutChar(unsigned char c)
{
// Wait for the transmitter to be ready
while ((AT91C_BASE_DBGU->DBGU_CSR & AT91C_US_TXEMPTY) == 0);
// Send character
AT91C_BASE_DBGU->DBGU_THR = c;
// Wait for the transfer to complete
while ((AT91C_BASE_DBGU->DBGU_CSR & AT91C_US_TXEMPTY) == 0);
}
//------------------------------------------------------------------------------
/// Return 1 if a character can be read in DBGU
//------------------------------------------------------------------------------
unsigned int DBGU_IsRxReady()
{
return (AT91C_BASE_DBGU->DBGU_CSR & AT91C_US_RXRDY);
}
//------------------------------------------------------------------------------
/// Reads and returns a character from the DBGU.
/// \note This function is synchronous (i.e. uses polling).
/// \return Character received.
//------------------------------------------------------------------------------
unsigned char DBGU_GetChar(void)
{
while ((AT91C_BASE_DBGU->DBGU_CSR & AT91C_US_RXRDY) == 0);
return AT91C_BASE_DBGU->DBGU_RHR;
}
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