173 lines
7.0 KiB
C
173 lines
7.0 KiB
C
/****************************************************************************************
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| Description: demo program bootloader interface source file
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| File Name: boot.c
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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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| 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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| 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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| 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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| 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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/****************************************************************************************
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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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** NAME: BootActivate
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** PARAMETER: none
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** RETURN VALUE: none
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** DESCRIPTION: Bootloader activation function.
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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 (*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 EntryFromProg in the bootloader. note that
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* 1 is added to this address to enable a switch from Thumb2 to Thumb mode
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*/
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pEntryFromProgFnc = (void*)0x000000F0 + 1;
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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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** NAME: BootComInit
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** PARAMETER: none
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** RETURN VALUE: none
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** DESCRIPTION: Initializes the UART communication interface
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**
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****************************************************************************************/
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void BootComInit(void)
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{
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/* enable the UART0 peripheral */
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SysCtlPeripheralEnable(SYSCTL_PERIPH_UART0);
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/* enable the and configure UART0 related peripherals and pins */
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SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);
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GPIOPinTypeUART(GPIO_PORTA_BASE, GPIO_PIN_0 | GPIO_PIN_1);
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/* configure the UART0 baudrate and communication parameters */
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UARTConfigSetExpClk(UART0_BASE, SysCtlClockGet(), BOOT_COM_UART_BAUDRATE,
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(UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_ONE |
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UART_CONFIG_PAR_NONE));
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} /*** end of BootComInit ***/
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/****************************************************************************************
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** NAME: BootComCheckActivationRequest
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** PARAMETER: none
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** RETURN VALUE: none
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** DESCRIPTION: 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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**
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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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** NAME: UartReceiveByte
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** PARAMETER: data pointer to byte where the data is to be stored.
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** RETURN VALUE: 1 if a byte was received, 0 otherwise.
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** DESCRIPTION: Receives a communication interface byte if one is present.
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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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signed long result;
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/* try to read a newly received byte */
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result = UARTCharGetNonBlocking(UART0_BASE);
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/* check if a new byte was received */
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if(result != -1)
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{
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/* store the received byte */
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*data = (unsigned char)result;
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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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