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| /**
* \file
*
* \brief SAM D20 SAM-BA Bootloader
*
* Copyright (c) 2014 Atmel Corporation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. The name of Atmel may not be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 4. This software may only be redistributed and used in connection with an
* Atmel microcontroller product.
*
* THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
* EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*/
/**
* --------------------
* SAM-BA Implementation on SAMD20
* --------------------
* Requirements to use SAM-BA :
*
* Supported communication interfaces :
* --------------------
*
* SERCOM3 : TX:PA24 RX:PA25
* Baudrate : 115200 8N1
*
* Pins Usage
* --------------------
* The following pins are used by the program :
* PA25 : input
* PA24 : output
* PA15 : input
*
* The application board shall avoid driving the PA25,PA24 and PA15 signals
* while the boot program is running (after a POR for example)
*
* Memory Mapping
* --------------------
* SAM-BA code will be located at 0x0 and executed before any applicative code.
*
* Applications compiled to be executed along with the bootloader will start at
* 0x800
* Before jumping to the application, the bootloader changes the VTOR register
* to use the interrupt vectors of the application @0x800.<- not required as
* application code is taking care of this
*
*/
#include "samd20.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "conf_bootloader.h"
#include "sam_ba_monitor.h"
#include "usart_sam_ba.h"
static void check_start_application(void);
/**
* \brief Check the application startup condition
*
*/
static void check_start_application(void)
{
uint32_t app_start_address;
/* Load the Reset Handler address of the application */
app_start_address = *(uint32_t *)(APP_START_ADDRESS + 4);
/**
* Test reset vector of application @APP_START_ADDRESS+4
* Stay in SAM-BA if *(APP_START+0x4) == 0xFFFFFFFF
* Application erased condition
*/
if (app_start_address == 0xFFFFFFFF) {
/* Stay in bootloader */
return;
}
volatile PortGroup *boot_port = (volatile PortGroup *)(&(PORT->Group[BOOT_LOAD_PIN / 32]));
volatile bool boot_en;
/* Enable the input mode in Boot GPIO Pin */
boot_port->DIRCLR.reg = GPIO_BOOT_PIN_MASK;
boot_port->PINCFG[BOOT_LOAD_PIN & 0x1F].reg = PORT_PINCFG_INEN | PORT_PINCFG_PULLEN;
boot_port->OUTSET.reg = GPIO_BOOT_PIN_MASK;
/* Read the BOOT_LOAD_PIN status */
boot_en = (boot_port->IN.reg) & GPIO_BOOT_PIN_MASK;
/* Check the bootloader enable condition */
if (!boot_en) {
/* Stay in bootloader */
return;
}
/* Rebase the Stack Pointer */
__set_MSP(*(uint32_t *) APP_START_ADDRESS);
/* Rebase the vector table base address */
SCB->VTOR = ((uint32_t) APP_START_ADDRESS & SCB_VTOR_TBLOFF_Msk);
/* Jump to application Reset Handler in the application */
asm("bx %0"::"r"(app_start_address));
}
#if DEBUG_ENABLE
# define DEBUG_PIN_HIGH PORT->Group[0].OUTSET.reg=(1u<<BOOT_LED)
# define DEBUG_PIN_LOW PORT->Group[0].OUTCLR.reg=(1u<<BOOT_LED)
#else
# define DEBUG_PIN_HIGH do{}while(0)
# define DEBUG_PIN_LOW do{}while(0)
#endif
/**
* \brief SAMD20 SAM-BA Main loop.
* \return Unused (ANSI-C compatibility).
*/
int main(void)
{
#if DEBUG_ENABLE
/* Set BOOT_LED pin as output */
PORT->Group[0].DIRSET.reg=(1u<<BOOT_LED);
#endif
DEBUG_PIN_HIGH;
/* Jump in application if condition is satisfied */
check_start_application();
/* Make OSC8M prescalar to zero rather divide by 8 */
SYSCTRL->OSC8M.bit.PRESC = 0;
/* UART is enabled in all cases */
usart_open();
DEBUG_PIN_LOW;
/* Wait for a complete enum on usb or a '#' char on serial line */
while (1) {
/* Check if a '#' has been received */
if (usart_sharp_received()) {
sam_ba_monitor_init(SAM_BA_INTERFACE_USART);
/* SAM-BA on UART loop */
while(1) {
sam_ba_monitor_run();
}
}
}
} |
Update microcontrôleur ATMEL ATSAMD20J17
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Envoyé par cracked
Une fois que c'est fait, la méthode de programmation de ton programme utilisateur change. Elle se fait au travers de par SAM-BA 2.17 et du bootloader préalablement programmé. Atmel Studio ne te sert plus qu'a compiler le programme principal avec un démarrage à 0x800 mais plus besoin de Atmel Studio et d'une sonde Jtag (intégré ou non) pour programmer.
être amené à faire une modification du hard ou carrément de changer de micro à la fin ça la fou mal.
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