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Mysteo
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App/boot.c
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App/boot.c
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/************************************************************************************//**
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* \file Demo/ARMCM0_STM32G0_Nucleo_G071RB_CubeIDE/Prog/App/boot.c
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* \brief Demo program bootloader interface source file.
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* \ingroup Prog_ARMCM0_STM32G0_Nucleo_G071RB_CubeIDE
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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) 2020 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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* Local data declarations
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****************************************************************************************/
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/** \brief UART handle to be used in API calls. */
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static UART_HandleTypeDef rs232Handle;
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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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/* Configure UART peripheral. */
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rs232Handle.Instance = USART2;
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rs232Handle.Init.BaudRate = BOOT_COM_RS232_BAUDRATE;
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rs232Handle.Init.WordLength = UART_WORDLENGTH_8B;
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rs232Handle.Init.StopBits = UART_STOPBITS_1;
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rs232Handle.Init.Parity = UART_PARITY_NONE;
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rs232Handle.Init.HwFlowCtl = UART_HWCONTROL_NONE;
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rs232Handle.Init.Mode = UART_MODE_TX_RX;
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rs232Handle.Init.OverSampling = UART_OVERSAMPLING_16;
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rs232Handle.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_ENABLE;
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rs232Handle.Init.ClockPrescaler = UART_PRESCALER_DIV1;
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/* Initialize the UART peripheral. */
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HAL_UART_Init(&rs232Handle);
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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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HAL_StatusTypeDef result;
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/* receive a byte in a non-blocking manner */
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result = HAL_UART_Receive(&rs232Handle, data, 1, 0);
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/* process the result */
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if (result == HAL_OK)
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{
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/* success */
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return 1;
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}
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/* error occurred */
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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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