204 lines
8.3 KiB
C
204 lines
8.3 KiB
C
/************************************************************************************//**
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* \file Demo\ARMCM0_STM32_Discovery_STM32F051_GCC\Prog\boot.c
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* \brief Demo program bootloader interface source file.
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* \ingroup Prog_ARMCM0_STM32_Discovery_STM32F051_GCC
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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) 2016 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_UART_ENABLE > 0)
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static void BootComUartInit(void);
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static void BootComUartCheckActivationRequest(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_UART_ENABLE > 0)
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BootComUartInit();
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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_UART_ENABLE > 0)
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BootComUartCheckActivationRequest();
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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_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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static void BootComUartInit(void)
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{
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GPIO_InitTypeDef GPIO_InitStructure;
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USART_InitTypeDef USART_InitStructure;
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/* enable UART peripheral clock */
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);
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/* enable GPIO peripheral clock for transmitter and receiver pins */
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RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
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/* configure alternate function for the USART2 Tx/Rx pins */
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GPIO_PinAFConfig(GPIOA, GPIO_PinSource2, GPIO_AF_1);
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GPIO_PinAFConfig(GPIOA, GPIO_PinSource3, GPIO_AF_1);
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/* Configure USART2 pins: Rx (PA2) and Tx (PA3) */
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
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GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
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GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
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GPIO_Init(GPIOA, &GPIO_InitStructure);
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/* configure UART communication parameters */
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USART_InitStructure.USART_BaudRate = BOOT_COM_UART_BAUDRATE;
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USART_InitStructure.USART_WordLength = USART_WordLength_8b;
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USART_InitStructure.USART_StopBits = USART_StopBits_1;
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USART_InitStructure.USART_Parity = USART_Parity_No;
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USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
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USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
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USART_Init(USART2, &USART_InitStructure);
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/* enable UART */
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USART_Cmd(USART2, ENABLE);
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} /*** end of BootComUartInit ***/
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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 BootComUartCheckActivationRequest(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 BootComUartCheckActivationRequest ***/
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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 flag to see if a byte was received */
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if (USART_GetFlagStatus(USART2, USART_FLAG_RXNE) == SET)
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{
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/* retrieve and store the newly received byte */
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*data = (unsigned char)USART_ReceiveData(USART2);
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/* all done */
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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 UartReceiveByte ***/
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#endif /* BOOT_COM_UART_ENABLE > 0 */
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/*********************************** end of boot.c *************************************/
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