Atmel dragon bootloader
Copy the zero folder to: C:\Users\ foo\Documents\Atmel Studio\7.0, foo is your user name.
![atmel dragon bootloader atmel dragon bootloader](https://wspublishing.net/avr-c/restoring-arduino-mega-bootloader/arduino-mega-2560-bootloader-file-location.jpg)
The zero folder holds the source files for the Arduino SAMD21 bootloaders.
#Atmel dragon bootloader install
#Atmel dragon bootloader code
Bootloader source code for the bootloaders shown for the Arduino SAMD boards are found in the path: C:\Users\ foo\AppData\Local\Arduino15\packages\arduino\hardware\samd\1.8.9\bootloaders, replace foo with your Win 10 user name, and enable “show hidden files” in Explorer View. After installation, goto Tools -> Board and select the Arduino MKRZero board : Scroll down to find and install the Arduino package: Arduino SAMD Boards ( 32 bits ARM Cortex M0+ ).
#Atmel dragon bootloader windows 10
Steps involved to make the custom bootloader are these, assuming Windows 10 is used: It turned out that a fresh installed Arduino IDE is able to add GNU ARM Cortex M0+ toolchain for various Arduino boards that uses the Atmel SAMD21 microcontroller. The user L-LED was not mounted, so the RX- and TX-LEDs could be used as bootloading progress indicators. No interrupts are used in my bootloader.I recently got a low-cost ARM Cortex M0 based ( Atmel SAMD21G18A ) board, a clone of the Robotdyn SAMD21 M0-mini board and wanted to make a custom Arduino IDE compatible bootloader using the Atmel Studio IDE – it has the GNU-ARM toolchain built in. Currently both bootloader and main program disable the interrupts before doing the switch. For sure it seems a problem with the interrupt disabling which i was trying to achieve with the line "_disable_irq()" in the main program. But there is for sure a problem here: second time i switch between bootloader and main program, it seems that my interrupts are not working corretly anymore. * Jump to user Reset Handler in the application */Īpplication_code_entry() //asm("bx %0"::"r"(application_code_entry)) īy pressing a push button on the pcb i can switch between bootloader and main program indefinitely. * Load the Reset Handler address of the application */Īpplication_code_entry = (void (*)(void))(unsigned *)(*(unsigned *) SCB->VTOR = ((uint32_t) APP_START_ADDRESS & SCB_VTOR_TBLOFF_Msk) * Rebase the vector table base address */ _set_MSP(*(uint32_t *) APP_START_ADDRESS) Sysclk_disable_peripheral_clock(USART_SERIAL_ID) Is it correct to NOT modify the ram spaces for the two programs?Īnyway, with the previous spaces definitions i was able to run the bootloader which simply runs the main program by calling the following function:Īpp_check_address_ptr = (uint32_t *) app_check_address.Why i had to reduce the length from "0x00200000" to "0x00100000" in order to let Atmel Studio compile and run the code correctly?.
![atmel dragon bootloader atmel dragon bootloader](https://wspublishing.net/avr-c/arduino-mega-atmel-ice-connection/atmel-ice-mega-icsp.jpg)
Related to this few lines of code my doubts are: * BOOTLOADER Memory Spaces Definitions */ * MAIN PROGRAM Memory Spaces Definitions */ Below you can find the memory definitions where, for both main program and boot, i had to reduced the ROM length from "0x00200000" to "0x00100000": I was able to build a preliminary version of the bootloader by reducing the length of both the bootloader and the main program. I've tried to have some clarification from the datasheed but i was actually not able to solve my doubts. In the end it was not an issue with the length of the rom and i'm quite confused right now.