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djzoom

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I would like to ask if I need to set the fuses and burn the BOOTLOADER before uploading the program to the newly bought SAMD21 blank chip?

cruelfox

Make fuse and burn BOOTLOADER? What is the purpose?

dcexpert

Burn only when needed, generally not necessary

tiankai001

Select as needed

djzoom

cruelfox posted on 2019-2-27 10:09 Making fuses and burning BOOTLOADER? What is the purpose of this?

Master, I sent you a message~~~ When I used MEGA328 before, the blank chip had to make fuses and burn BOOTLOADER before uploading the program. So does the blank chip of SAMD21 not need it? Can I upload the program directly after soldering it to the PCB? It's not a development board

djzoom

tiankai001 Posted on 2019-2-27 10:35 Choose according to your needs

In what circumstances is it necessary?

djzoom

dcexpert posted on 2019-2-27 10:12 Burn only when needed, generally not needed

In what cases is it needed? Can you tell me more specifically?

cruelfox

djzoom posted on 2019-2-27 11:16 Great God, I sent you a message~~~ When I used MEGA328 before, the blank chip had to be set with fuses and the BOOTLOADER burned before the program could be uploaded, so...

Mega328 does not need a bootloader, ISP can download directly. SAMD21 can download and debug using the SWD port. As long as you reserve the two pins SWDIO and SWCLK to connect the debugger, you can debug and download after soldering them to the PCB.

tiankai001

djzoom posted on 2019-2-27 11:16 In what cases is it necessary?

The fuse is burned only when encryption protection is required. Bootload is a burning method, and there are other burning methods, such as ISP

djzoom

cruelfox posted on 2019-2-27 11:30 Mega328 doesn't need a bootloader either, ISP can download it directly. SAMD21 can be downloaded and debugged using the SWD port. As long as you put the SW ...

Thank you, for example, if I want to make an ARDUINO ZERO, can I just draw the board according to the schematic, buy a blank SAMD21 chip and solder it directly?

djzoom

tiankai001 posted on 2019-2-27 12:07 The fuse is burned when encryption protection is needed. Bootload is a burning method, and there are other burning methods, such as ISP

It is said on the Internet that for AVR microcontrollers, BOOTLOADER is like the BIOS of a computer, and the program is like the application software of a computer. So when a blank chip is bought, the manufacturer has already made this "BIOS", and unless the individual has special requirements, there is no need to care about it, right?

dcexpert

djzoom posted on 2019-2-27 11:17 In what cases is it necessary? Can you tell me more specifically?

When an online upgrade is required

cruelfox

djzoom posted on 2019-2-27 12:16 Thank you, for example, if I want to make an ARDUINO ZERO, I just need to draw the board according to the schematic diagram, buy the SAMD21 blank chip and solder it directly...

Yes. If you are not sure, you can post the schematic diagram for everyone to see.

djzoom

cruelfox posted on 2019-2-27 13:13 Yes. If you are not sure, you can post the schematic diagram for everyone to see.

cruelfox

djzoom posted on 2019-2-27 13:33

This is of course no problem, the sockets for the debug port are reserved.

zhuyebb

Select as needed

djzoom

cruelfox posted on 2019-2-27 13:36 Of course there is no problem with this, the socket for the debug port is reserved.

Master, can STLINK be used? It's the kind sold on Taobao for 10 yuan

cruelfox

djzoom posted on 2019-2-27 13:47 Master, can STLINK be used? It's the 10 yuan one sold on Taobao

As long as your development software supports it, it's fine. I don't think ATMEL official development tools support ST-Link

tiankai001

djzoom posted on 2019-2-27 12:18 It is said on the Internet that for AVR microcontrollers, the BOOTLOADER is like the BIOS of a computer, and the program is like the application software of a computer. So when you buy a blank chip...

Some microcontrollers have a BOOTLOADER that is ready-made, while some are made by the user themselves.

djzoom

Thank you for the answer from the teacher above. I always thought that after buying the blank AVR microcontroller and soldering the board, I had to install the fuse and burn the boot program first. Since the teachers said it was not necessary, I will use the TTL serial port downloader to upload it through TX RX and try it~~