228 lines
9.1 KiB
C
228 lines
9.1 KiB
C
/************************************************************************************//**
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* \file Demo/ARMCM3_EFM32_Olimex_EM32G880F128STK_Crossworks/Prog/boot.c
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* \brief Demo program bootloader interface source file.
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* \ingroup Prog_ARMCM3_EFM32_Olimex_EM32G880F128STK_Crossworks
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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) 2012 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 have received a copy of the GNU General Public License along with OpenBLT. It
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* should be located in ".\Doc\license.html". If not, contact Feaser to obtain a copy.
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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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* Function prototypes
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****************************************************************************************/
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#if (BOOT_COM_RS232_ENABLE > 0)
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static void BootComRs232Init(void);
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static void BootComRs232CheckActivationRequest(void);
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#endif
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/************************************************************************************//**
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** \brief Initializes the 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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#if (BOOT_COM_RS232_ENABLE > 0)
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BootComRs232Init();
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#endif
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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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#if (BOOT_COM_RS232_ENABLE > 0)
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BootComRs232CheckActivationRequest();
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#endif
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} /*** end of BootComCheckActivationRequest ***/
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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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void BootActivate(void)
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{
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/* perform software reset to activate the bootoader again */
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NVIC_SystemReset();
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} /*** end of BootActivate ***/
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#if (BOOT_COM_RS232_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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* Macro definitions
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****************************************************************************************/
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/** \brief Timeout time for the reception of a CTO packet. The timer is started upon
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* reception of the first packet byte.
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*/
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#define RS232_CTO_RX_PACKET_TIMEOUT_MS (100u)
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/****************************************************************************************
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* Function prototypes
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****************************************************************************************/
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static unsigned char Rs232ReceiveByte(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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static void BootComRs232Init(void)
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{
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LEUART_Init_TypeDef init = LEUART_INIT_DEFAULT;
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/* configure GPIO pins */
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CMU_ClockEnable(cmuClock_GPIO, true);
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/* to avoid false start, configure output as high */
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GPIO_PinModeSet(gpioPortC, 6, gpioModePushPull, 1);
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GPIO_PinModeSet(gpioPortC, 7, gpioModeInput, 0);
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/* enable CORE LE clock in order to access LE modules */
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CMU_ClockEnable(cmuClock_CORELE, true);
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/* select LFXO for LEUARTs (and wait for it to stabilize) */
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CMU_ClockSelectSet(cmuClock_LFB, cmuSelect_LFXO);
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/* do not prescale clock */
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CMU_ClockDivSet(cmuClock_LEUART1, cmuClkDiv_1);
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/* enable LEUART1 clock */
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CMU_ClockEnable(cmuClock_LEUART1, true);
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/* configure LEUART */
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init.enable = leuartDisable;
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LEUART_Init(LEUART1, &init);
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LEUART_BaudrateSet(LEUART1, 0, BOOT_COM_RS232_BAUDRATE);
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/* enable pins at default location */
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LEUART1->ROUTE = LEUART_ROUTE_RXPEN | LEUART_ROUTE_TXPEN;
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/* clear previous RX interrupts */
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LEUART_IntClear(LEUART1, LEUART_IF_RXDATAV);
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/* finally enable it */
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LEUART_Enable(LEUART1, leuartEnable);
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} /*** end of BootComRs232Init ***/
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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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static void BootComRs232CheckActivationRequest(void)
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{
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static unsigned char xcpCtoReqPacket[BOOT_COM_RS232_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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static unsigned long xcpCtoRxStartTime = 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 (Rs232ReceiveByte(&xcpCtoReqPacket[0]) == 1)
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{
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/* check that the length has a valid value. it should not be 0 */
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if ( (xcpCtoReqPacket[0] > 0) &&
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(xcpCtoReqPacket[0] <= BOOT_COM_RS232_RX_MAX_DATA) )
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{
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/* store the start time */
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xcpCtoRxStartTime = TimerGet();
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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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}
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else
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{
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/* store the next packet byte */
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if (Rs232ReceiveByte(&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) && (xcpCtoRxLength == 2))
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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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else
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{
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/* check packet reception timeout */
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if (TimerGet() > (xcpCtoRxStartTime + RS232_CTO_RX_PACKET_TIMEOUT_MS))
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{
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/* cancel cto packet reception due to timeout. note that this automatically
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* discards the already received packet bytes, allowing the host to retry.
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*/
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xcpCtoRxInProgress = 0;
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}
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}
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}
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} /*** end of BootComRs232CheckActivationRequest ***/
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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 Rs232ReceiveByte(unsigned char *data)
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{
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/* check to see if a new bytes was received */
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if ((LEUART1->IF & LEUART_IF_RXDATAV) != 0)
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{
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/* store the received data byte and set return value to positive */
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*data = LEUART_Rx(LEUART1);
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return 1;
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}
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/* still here to no new byte received */
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return 0;
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} /*** end of Rs232ReceiveByte ***/
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#endif /* BOOT_COM_RS232_ENABLE > 0 */
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/*********************************** end of boot.c *************************************/
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