start application if valid at boot
if the application is not valid, check and start the bootloader Change-Id: I323f2b3a1828d3e40a02c7fc755d07009fb43a85
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usb_dfu_main.c
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usb_dfu_main.c
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/**
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* \file
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* \brief USB DFU bootloader implementation (DFU mode)
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*
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* \brief Application implement
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* Copyright (c) 2018-2019 sysmocom -s.f.m.c. GmbH, Author: Kevin Redon <kredon@sysmocom.de>
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*
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* Copyright (c) 2015-2018 Microchip Technology Inc. and its subsidiaries.
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* Copyright (c) 2018 sysmocom -s.f.m.c. GmbH, Author: Kevin Redon <kredon@sysmocom.de>
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* \asf_license_start
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* \page License
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*
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* Subject to your compliance with these terms, you may use Microchip
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* software and any derivatives exclusively with Microchip products.
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* It is your responsibility to comply with third party license terms applicable
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* to your use of third party software (including open source software) that
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* may accompany Microchip software.
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*
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* THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS". NO WARRANTIES,
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* WHETHER EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE,
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* INCLUDING ANY IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY,
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* AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT WILL MICROCHIP BE
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* LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, INCIDENTAL OR CONSEQUENTIAL
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* LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND WHATSOEVER RELATED TO THE
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* SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS BEEN ADVISED OF THE
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* POSSIBILITY OR THE DAMAGES ARE FORESEEABLE. TO THE FULLEST EXTENT
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* ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL CLAIMS IN ANY WAY
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* RELATED TO THIS SOFTWARE WILL NOT EXCEED THE AMOUNT OF FEES, IF ANY,
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* THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THIS SOFTWARE.
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*
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* \asf_license_stop
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*
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*/
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/*
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* Support and FAQ: visit <a href="https://www.microchip.com/support/">Microchip Support</a>
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "atmel_start.h"
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#include "atmel_start_pins.h"
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/** Start address of the application in flash
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* \remark must be initialized by check_bootloader
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*/
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static uint32_t* application_start_address;
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/** Check if the bootloader is valid
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* \return true if the bootloader is valid and can be run
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* \remark initializes application_start_address
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*/
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static bool check_bootloader(void)
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{
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if (hri_nvmctrl_read_STATUS_BOOTPROT_bf(FLASH_0.dev.hw) > 15) { // ensure BOOTPROT setting is valid
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return false;
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}
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application_start_address = (uint32_t*)((15 - hri_nvmctrl_read_STATUS_BOOTPROT_bf(FLASH_0.dev.hw)) * 8192); // calculate bootloader size to know start address of the application (e.g. after the bootloader)
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if (0 == application_start_address) { // no space has been reserved for the bootloader
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return false;
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}
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return true;
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}
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/** Check if starting the bootloader is forced
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* \return true of the DFU bootloader should be started
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*/
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static bool check_force_dfu(void)
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{
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}
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/** Check if the application is valid
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* \return true if the application is valid and can be started
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* \warning application_start_address must be initialized
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*/
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static bool check_application(void)
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{
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/* the application starts with the vector table
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* the first entry in the vector table is the initial stack pointer (SP) address
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* the stack will be placed in RAM which begins at 0x2000 0000, and there is up to 256 KB of RAM (0x40000).
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* if the SP is not in this range (e.g. flash has been erased) there is no valid application
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* the second entry in the vector table is the reset address, corresponding to the application start
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*/
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return (0x20000000 == ((*application_start_address) & 0xFFF80000));
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}
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/** Start the application
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* \warning application_start_address must be initialized
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*/
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static void start_application(void)
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{
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__set_MSP(*application_start_address); // re-base the Stack Pointer
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SCB->VTOR = ((uint32_t) application_start_address & SCB_VTOR_TBLOFF_Msk); // re-base the vector table base address
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asm("bx %0"::"r"(*(application_start_address + 1))); // jump to application Reset Handler in the application */
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}
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int main(void)
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{
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atmel_start_init();
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usb_dfu();
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atmel_start_init(); // initialise system
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if (!check_bootloader()) { // check bootloader
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// blink the LED to tell the user we don't know where the application starts
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while (true) {
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gpio_set_pin_level(LED_SYSTEM, false);
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delay_ms(500);
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gpio_set_pin_level(LED_SYSTEM, true);
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delay_ms(500);
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}
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}
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if (check_application()) { // application is valid
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start_application(); // start application
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} else {
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usb_dfu(); // start DFU bootloader
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}
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}
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15
usb_start.c
15
usb_start.c
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@ -82,23 +82,16 @@ void usb_dfu(void)
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while (!dfudf_is_enabled()); // wait for DFU to be installed
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gpio_set_pin_level(LED_SYSTEM, false); // switch LED on to indicate USB DFU stack is ready
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uint32_t application_start = hri_nvmctrl_read_STATUS_BOOTPROT_bf(FLASH_0.dev.hw); // read BOOTPROT setting to get the bootloader size
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ASSERT(application_start <= 15);
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application_start = (15 - application_start) * 8192; // calculate bootloader size to know where we should write the application firmware
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while (0 == application_start) { // no space has been reserved for the bootloader
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// blink the LED to tell the user we don't know where the application starts
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gpio_set_pin_level(LED_SYSTEM, false);
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delay_ms(500);
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gpio_set_pin_level(LED_SYSTEM, true);
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delay_ms(500);
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}
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ASSERT(hri_nvmctrl_read_STATUS_BOOTPROT_bf(FLASH_0.dev.hw) <= 15);
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uint32_t application_start_address = (15 - hri_nvmctrl_read_STATUS_BOOTPROT_bf(FLASH_0.dev.hw)) * 8192; // calculate bootloader size to know where we should write the application firmware
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ASSERT(application_start_address > 0);
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while (true) { // main DFU infinite loop
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// run the second part of the USB DFU state machine handling non-USB aspects
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if (USB_DFU_STATE_DFU_DNLOAD_SYNC == dfu_state || USB_DFU_STATE_DFU_DNBUSY == dfu_state) { // there is some data to be flashed
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gpio_set_pin_level(LED_SYSTEM, true); // switch LED off to indicate we are flashing
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if (dfu_download_length > 0) { // there is some data to be flashed
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int32_t rc = flash_write(&FLASH_0, application_start + dfu_download_offset, dfu_download_data, dfu_download_length); // write downloaded data chunk to flash
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int32_t rc = flash_write(&FLASH_0, application_start_address + dfu_download_offset, dfu_download_data, dfu_download_length); // write downloaded data chunk to flash
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if (ERR_NONE == rc) {
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dfu_state = USB_DFU_STATE_DFU_DNLOAD_IDLE; // indicate flashing this block has been completed
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} else { // there has been a programming error
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