170 lines
6.8 KiB
C
170 lines
6.8 KiB
C
/************************************************************************************//**
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* \file Demo\HCS12_Evbplus_Dragon12p_CodeWarrior\Prog\boot.c
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* \brief Demo program bootloader interface source file.
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* \ingroup Prog_HCS12_Evbplus_Dragon12p_CodeWarrior
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* \internal
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*----------------------------------------------------------------------------------------
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* C O P Y R I G H T
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*----------------------------------------------------------------------------------------
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* Copyright (c) 2013 by Feaser http://www.feaser.com All rights reserved
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*
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*----------------------------------------------------------------------------------------
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* L I C E N S E
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*----------------------------------------------------------------------------------------
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* This file is part of OpenBLT. OpenBLT is free software: you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as published by the Free
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* Software Foundation, either version 3 of the License, or (at your option) any later
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* version.
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*
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* OpenBLT is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with OpenBLT.
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* If not, see <http://www.gnu.org/licenses/>.
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*
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* A special exception to the GPL is included to allow you to distribute a combined work
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* that includes OpenBLT without being obliged to provide the source code for any
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* proprietary components. The exception text is included at the bottom of the license
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* file <license.html>.
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*
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* \endinternal
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****************************************************************************************/
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/****************************************************************************************
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* Include files
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****************************************************************************************/
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#include "header.h" /* generic header */
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/************************************************************************************//**
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** \brief Bootloader activation function.
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** \return none.
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**
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****************************************************************************************/
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static void BootActivate(void)
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{
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void (*near pEntryFromProgFnc)(void);
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/* stop the timer from generating interrupts */
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TimeDeinit();
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/* set pointer to the address of function reset_connected_handler in the bootloader. */
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pEntryFromProgFnc = (void(*)(void))(0xfef0);
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/* call EntryFromProg to activate the bootloader. */
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pEntryFromProgFnc();
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} /*** end of BootActivate ***/
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#if (BOOT_COM_UART_ENABLE > 0)
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/****************************************************************************************
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* U N I V E R S A L A S Y N C H R O N O U S R X T X I N T E R F A C E
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****************************************************************************************/
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/****************************************************************************************
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* Function prototypes
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****************************************************************************************/
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static unsigned char UartReceiveByte(unsigned char *data);
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/************************************************************************************//**
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** \brief Initializes the UART communication interface.
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** \return none.
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**
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****************************************************************************************/
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void BootComInit(void)
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{
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unsigned short baudrate_sbr0_12;
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/* reset the SCI subsystem's configuration, which automatically configures it for
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* 8,n,1 communication mode.
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*/
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SCI0CR2 = 0;
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SCI0CR1 = 0;
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SCI0BDH = 0;
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SCI0BDL = 0;
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/* configure the baudrate from BOOT_COM_UART_BAUDRATE */
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baudrate_sbr0_12 = (BOOT_CPU_SYSTEM_SPEED_KHZ * 1000ul) / 16 / BOOT_COM_UART_BAUDRATE;
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baudrate_sbr0_12 &= SCI0BD_SBR_MASK;
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/* write first MSB then LSB for the baudrate to latch */
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SCI0BDH = (unsigned char)(baudrate_sbr0_12 >> 8);
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SCI0BDL = (unsigned char)baudrate_sbr0_12;
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/* enable the receiver */
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SCI0CR2 |= (SCI0CR2_RE_MASK);
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} /*** end of BootComInit ***/
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/************************************************************************************//**
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** \brief Receives the CONNECT request from the host, which indicates that the
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** bootloader should be activated and, if so, activates it.
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** \return none.
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**
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****************************************************************************************/
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void BootComCheckActivationRequest(void)
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{
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static unsigned char xcpCtoReqPacket[BOOT_COM_UART_RX_MAX_DATA+1];
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static unsigned char xcpCtoRxLength;
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static unsigned char xcpCtoRxInProgress = 0;
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/* start of cto packet received? */
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if (xcpCtoRxInProgress == 0)
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{
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/* store the message length when received */
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if (UartReceiveByte(&xcpCtoReqPacket[0]) == 1)
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{
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/* indicate that a cto packet is being received */
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xcpCtoRxInProgress = 1;
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/* reset packet data count */
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xcpCtoRxLength = 0;
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}
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}
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else
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{
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/* store the next packet byte */
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if (UartReceiveByte(&xcpCtoReqPacket[xcpCtoRxLength+1]) == 1)
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{
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/* increment the packet data count */
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xcpCtoRxLength++;
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/* check to see if the entire packet was received */
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if (xcpCtoRxLength == xcpCtoReqPacket[0])
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{
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/* done with cto packet reception */
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xcpCtoRxInProgress = 0;
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/* check if this was an XCP CONNECT command */
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if ((xcpCtoReqPacket[1] == 0xff) && (xcpCtoReqPacket[2] == 0x00))
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{
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/* connection request received so start the bootloader */
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BootActivate();
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}
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}
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}
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}
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} /*** end of BootComCheckActivationRequest ***/
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/************************************************************************************//**
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** \brief Receives a communication interface byte if one is present.
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** \param data Pointer to byte where the data is to be stored.
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** \return 1 if a byte was received, 0 otherwise.
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**
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****************************************************************************************/
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static unsigned char UartReceiveByte(unsigned char *data)
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{
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/* check if a new byte was received by means of the RDRF-bit */
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if((SCI0SR1 & SCI0SR1_RDRF_MASK) != 0)
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{
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/* store the received byte */
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data[0] = SCI0DRL;
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/* inform caller of the newly received byte */
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return 1;
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}
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/* inform caller that no new data was received */
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return 0;
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} /*** end of UartReceiveByte ***/
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#endif /* BOOT_COM_UART_ENABLE > 0 */
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/*********************************** end of boot.c *************************************/
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