/* ----------------------------------------------------------------------------
 *         ATMEL Microcontroller Software Support
 * ----------------------------------------------------------------------------
 * Copyright (c) 2009, Atmel Corporation
 * Copyright (c) 2018, sysmocom -s.f.m.c. GmbH, Author: Kevin Redon <kredon@sysmocom.de>
 *
 * 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.
 * ----------------------------------------------------------------------------
 */

/**
 * \file
 *
 * Implements UART console.
 *
 */

/*----------------------------------------------------------------------------
 *        Headers
 *----------------------------------------------------------------------------*/

#include "board.h"

#include <stdio.h>
#include <stdint.h>

#include "ringbuffer.h"

/*----------------------------------------------------------------------------
 *        Definitions
 *----------------------------------------------------------------------------*/

/*----------------------------------------------------------------------------
 *        Variables
 *----------------------------------------------------------------------------*/

/** Is Console Initialized. */
static uint8_t _ucIsConsoleInitialized=0;
/** Ring buffer to queue data to be sent */
static ringbuf uart_tx_buffer;

/**
 * \brief Configures an USART peripheral with the specified parameters.
 *
 * \param baudrate  Baudrate at which the USART should operate (in Hz).
 * \param masterClock  Frequency of the system master clock (in Hz).
 */
extern void UART_Configure( uint32_t baudrate, uint32_t masterClock)
{
	const Pin pPins[] = CONSOLE_PINS;
	Uart *pUart = CONSOLE_UART;

	/* Configure PIO */
	PIO_Configure(pPins, PIO_LISTSIZE(pPins));

	/* Configure PMC */
	PMC->PMC_PCER0 = 1 << CONSOLE_ID;

	/* Reset and disable receiver & 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;

	/* Configure baudrate */
	/* Asynchronous, no oversampling */
	//pUart->UART_BRGR = (masterClock / baudrate) / 16;
	if ((masterClock / baudrate) % 16 >= 7) {
		pUart->UART_BRGR = ( masterClock / baudrate) / 16 + 1;
	} else {
		pUart->UART_BRGR = ( masterClock / baudrate) / 16 + 0;
	}

	/* Disable PDC channel */
	pUart->UART_PTCR = UART_PTCR_RXTDIS | UART_PTCR_TXTDIS;

	/* Reset transmit ring buffer */
	rbuf_reset(&uart_tx_buffer);

	/* Enable TX interrupts */
	pUart->UART_IER = UART_IER_TXRDY;
	NVIC_SetPriority(CONSOLE_IRQ, 15); /* lowest priority */
	NVIC_EnableIRQ(CONSOLE_IRQ);
	
	/* Enable receiver and transmitter */
	pUart->UART_CR = UART_CR_RXEN | UART_CR_TXEN;

	/* Remember the configuration is complete */
	_ucIsConsoleInitialized=1 ;
}

/**
 * \brief Disables the USART peripheral and related IRQ
 */
void UART_Exit(void)
{
	if (!_ucIsConsoleInitialized) {
		return;
	}

	Uart *pUart = CONSOLE_UART;
	pUart->UART_IDR = UART_IDR_TXRDY;
	pUart->UART_CR = UART_CR_RSTRX | UART_CR_RSTTX | UART_CR_RXDIS | UART_CR_TXDIS | UART_CR_RSTSTA;
	PMC->PMC_PCDR0 = 1 << CONSOLE_ID;
	NVIC_DisableIRQ(CONSOLE_IRQ);
}

/** Interrupt Service routine to transmit queued data */
void CONSOLE_ISR(void)
{
	Uart *uart = CONSOLE_UART;
	if (uart->UART_SR & UART_SR_TXRDY) {
		if (!rbuf_is_empty(&uart_tx_buffer)) {
			uart->UART_THR = rbuf_read(&uart_tx_buffer);
		} else {
			uart->UART_IDR = UART_IER_TXRDY;
		}
	}
}

/**
 * \brief Outputs a character on the UART line.
 *
 * \note This function is asynchronous (i.e. uses a buffer and interrupt to complete the transfer).
 * \param c  Character to send.
 */
void UART_PutChar( uint8_t uc )
{
	Uart *pUart = CONSOLE_UART ;

	/* Initialize console is not already done */
	if ( !_ucIsConsoleInitialized )
	{
		UART_Configure(CONSOLE_BAUDRATE, BOARD_MCK);
	}

	if (!rbuf_is_full(&uart_tx_buffer)) {
		rbuf_write(&uart_tx_buffer, uc);
		if (!(pUart->UART_IMR & UART_IMR_TXRDY)) {
			pUart->UART_IER = UART_IER_TXRDY;
			CONSOLE_ISR();
		}
	}
}

/**
 * \brief Outputs a character on the UART line.
 *
 * \note This function is synchronous (i.e. uses polling and blocks until the transfer is complete).
 * \param c  Character to send.
 */
void UART_PutChar_Sync( uint8_t uc )
{
	Uart *pUart = CONSOLE_UART ;

	/* Initialize console is not already done */
	if ( !_ucIsConsoleInitialized )
	{
		UART_Configure(CONSOLE_BAUDRATE, BOARD_MCK);
	}

	while (!(pUart->UART_SR & UART_SR_TXRDY)); /* Wait for transfer buffer to be empty */
	pUart->UART_THR = uc; /* Send data to UART peripheral */
	while (!(pUart->UART_SR & UART_SR_TXRDY)); /* Wait for transfer buffer to transferred to shift register */
	while (!(pUart->UART_SR & UART_SR_TXEMPTY)); /* Wait for transfer shift register to be empty (i.e. transfer is complete) */
}

/**
 * \brief Input a character from the UART line.
 *
 * \note This function is synchronous
 * \return character received.
 */
extern uint32_t UART_GetChar( void )
{
	Uart *pUart = CONSOLE_UART ;

	if ( !_ucIsConsoleInitialized )
	{
		UART_Configure(CONSOLE_BAUDRATE, BOARD_MCK);
	}

	while ( (pUart->UART_SR & UART_SR_RXRDY) == 0 )
		WDT_Restart(WDT);

	return pUart->UART_RHR ;
}

/**
 * \brief Check if there is Input from UART line.
 *
 * \return true if there is Input.
 */
extern uint32_t UART_IsRxReady( void )
{
	Uart *pUart = CONSOLE_UART;

	if ( !_ucIsConsoleInitialized )
	{
		UART_Configure( CONSOLE_BAUDRATE, BOARD_MCK ) ;
	}

	return (pUart->UART_SR & UART_SR_RXRDY) > 0 ;
}

/**
 *  Displays the content of the given frame on the UART0.
 *
 *  \param pucFrame Pointer to the frame to dump.
 *  \param dwSize   Buffer size in bytes.
 */
extern void UART_DumpFrame( uint8_t* pucFrame, uint32_t dwSize )
{
	uint32_t dw ;

	for ( dw=0 ; dw < dwSize ; dw++ )
	{
		printf( "%02X ", pucFrame[dw] ) ;
	}

	printf( "\n\r" ) ;
}

/**
 *  Displays the content of the given buffer on the UART0.
 *
 *  \param pucBuffer  Pointer to the buffer to dump.
 *  \param dwSize     Buffer size in bytes.
 *  \param dwAddress  Start address to display
 */
extern void UART_DumpMemory( uint8_t* pucBuffer, uint32_t dwSize, uint32_t dwAddress )
{
	uint32_t i ;
	uint32_t j ;
	uint32_t dwLastLineStart ;
	uint8_t* pucTmp ;

	for ( i=0 ; i < (dwSize / 16) ; i++ )
	{
		printf( "0x%08X: ", (unsigned int)(dwAddress + (i*16)) ) ;
		pucTmp = (uint8_t*)&pucBuffer[i*16] ;

		for ( j=0 ; j < 4 ; j++ )
		{
			printf( "%02X%02X%02X%02X ", pucTmp[0], pucTmp[1], pucTmp[2], pucTmp[3] ) ;
			pucTmp += 4 ;
		}

		pucTmp=(uint8_t*)&pucBuffer[i*16] ;

		for ( j=0 ; j < 16 ; j++ )
		{
			UART_PutChar( *pucTmp++ ) ;
		}

		printf( "\n\r" ) ;
	}

	if ( (dwSize%16) != 0 )
	{
		dwLastLineStart=dwSize - (dwSize%16) ;

		printf( "0x%08X: ", (unsigned int)(dwAddress + dwLastLineStart) ) ;
		for ( j=dwLastLineStart ; j < dwLastLineStart+16 ; j++ )
		{
			if ( (j!=dwLastLineStart) && (j%4 == 0) )
			{
				printf( " " ) ;
			}

			if ( j < dwSize )
			{
				printf( "%02X", pucBuffer[j] ) ;
			}
			else
			{
				printf("  ") ;
			}
		}

		printf( " " ) ;
		for ( j=dwLastLineStart ; j < dwSize ; j++ )
		{
			UART_PutChar( pucBuffer[j] ) ;
		}

		printf( "\n\r" ) ;
	}
}

/**
 *  Reads an integer
 *
 *  \param pdwValue  Pointer to the uint32_t variable to contain the input value.
 */
extern uint32_t UART_GetInteger( uint32_t* pdwValue )
{
	uint8_t ucKey ;
	uint8_t ucNbNb=0 ;
	uint32_t dwValue=0 ;

	while ( 1 )
	{
		ucKey=UART_GetChar() ;
		UART_PutChar( ucKey ) ;

		if ( ucKey >= '0' &&  ucKey <= '9' )
		{
			dwValue = (dwValue * 10) + (ucKey - '0');
			ucNbNb++ ;
		}
		else
		{
			if ( ucKey == 0x0D || ucKey == ' ' )
			{
				if ( ucNbNb == 0 )
				{
					printf( "\n\rWrite a number and press ENTER or SPACE!\n\r" ) ;
					return 0 ;
				}
				else
				{
					printf( "\n\r" ) ;
					*pdwValue=dwValue ;

					return 1 ;
				}
			}
			else
			{
				printf( "\n\r'%c' not a number!\n\r", ucKey ) ;

				return 0 ;
			}
		}
		WDT_Restart(WDT);
	}
}

/**
 *  Reads an integer and check the value
 *
 *  \param pdwValue  Pointer to the uint32_t variable to contain the input value.
 *  \param dwMin     Minimum value
 *  \param dwMax     Maximum value
 */
extern uint32_t UART_GetIntegerMinMax( uint32_t* pdwValue, uint32_t dwMin, uint32_t dwMax )
{
	uint32_t dwValue=0 ;

	if ( UART_GetInteger( &dwValue ) == 0 )
	{
		return 0 ;
	}

	if ( dwValue < dwMin || dwValue > dwMax )
 {
		printf( "\n\rThe number have to be between %d and %d\n\r", (int)dwMin, (int)dwMax ) ;

		return 0 ;
	}

	printf( "\n\r" ) ;

	*pdwValue = dwValue ;

	return 1 ;
}

/**
 *  Reads an hexadecimal number
 *
 *  \param pdwValue  Pointer to the uint32_t variable to contain the input value.
 */
extern uint32_t UART_GetHexa32( uint32_t* pdwValue )
{
	uint8_t ucKey ;
	uint32_t dw = 0 ;
	uint32_t dwValue = 0 ;

	for ( dw=0 ; dw < 8 ; dw++ )
	{
		ucKey = UART_GetChar() ;
		UART_PutChar( ucKey ) ;

		if ( ucKey >= '0' &&  ucKey <= '9' )
		{
			dwValue = (dwValue * 16) + (ucKey - '0') ;
		}
		else
		{
			if ( ucKey >= 'A' &&  ucKey <= 'F' )
			{
				dwValue = (dwValue * 16) + (ucKey - 'A' + 10) ;
			}
			else
			{
				if ( ucKey >= 'a' &&  ucKey <= 'f' )
				{
					dwValue = (dwValue * 16) + (ucKey - 'a' + 10) ;
				}
				else
				{
					printf( "\n\rIt is not a hexa character!\n\r" ) ;

					return 0 ;
				}
			}
		}
	}

	printf("\n\r" ) ;
	*pdwValue = dwValue ;

	return 1 ;
}

#if defined __ICCARM__ /* IAR Ewarm 5.41+ */
/**
 * \brief Outputs a character on the UART.
 *
 * \param c  Character to output.
 *
 * \return The character that was output.
 */
extern WEAK signed int putchar( signed int c )
{
	UART_PutChar( c ) ;

	return c ;
}
#endif // defined __ICCARM__