arduino:arduino_without_a_bootloader
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arduino:arduino_without_a_bootloader [2020/01/04 02:23] – [Arduino without a bootloader] mithat | arduino:arduino_without_a_bootloader [2020/02/27 18:18] – [Cursed is the bootloader] mithat | ||
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One of the things that simplifies Arduino development is its [[https:// | One of the things that simplifies Arduino development is its [[https:// | ||
- | In the case of the Arduino, the bootloader | + | In the case of the Arduino, the bootloader |
- | But a bootloader isn't the only way to program the microcontrollers on these boards. Instead, you can use an external programming device (a.k.a, // | + | But a bootloader isn't the only way to program the microcontrollers on these boards. Instead, you can use an external programming device (a.k.a, // |
- | So while it's entirely possible to program many Arduino boards without using a bootloader, you would have to tie up one USB port on your computer for programming | + | So while it's entirely possible to program many Arduino boards without using a bootloader, you would have to tie up one USB port on your computer for the programmer |
===== Cursed is the bootloader ===== | ===== Cursed is the bootloader ===== | ||
- | There are times when you might want to bypass the convenience a bootloader offers | + | In spite of the convenience a bootloader offers, there are times when you might want to forego this and program |
- | Another reason to not use a bootloader is that your project' | + | Another reason to not use a bootloader is that the startup time is critical. The Arduino bootloader introduces about a second and a half delay between power-up/ |
Yet another situation where you might not want a bootloader is if you have lowered or disabled the [[https:// | Yet another situation where you might not want a bootloader is if you have lowered or disabled the [[https:// | ||
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Below, I cover a few cases to get you started. Most of these use the USBtinyISP.((As near as I can tell, the original source of the USBtinyISP design is Dick Streefland' | Below, I cover a few cases to get you started. Most of these use the USBtinyISP.((As near as I can tell, the original source of the USBtinyISP design is Dick Streefland' | ||
- | The original USBtinyISP has a built-in 3x2 keyed IDC cable that carries the signals | + | The original USBtinyISP has a built-in 3x2 IDC cable that carries the signals |
- | If you are using a USBtinyISP clone, | + | If you are using a USBtinyISP clone, |
Depending on the board you are programming, | Depending on the board you are programming, | ||
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</ | </ | ||
===== Procedures ===== | ===== Procedures ===== | ||
- | As is the case when uploading a program to your Arduino using a bootloader, when uploading a program using a programmer you must specify what the target board is. So when doing any of the following, make sure //Tools > Board// and //Tools > Processor// are set correctly for your board. | + | As is the case when uploading a program to your Arduino using a bootloader, when uploading a program using a programmer you must specify what the target board is. So when doing any of the following, make sure //Tools > Board// and //Tools > Processor// |
Now is also a good time to mention a significant caveat about using a programmer as described here. <WRAP center round important 80%> | Now is also a good time to mention a significant caveat about using a programmer as described here. <WRAP center round important 80%> | ||
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</ | </ | ||
- | Directly uploading a sketch to an Uno or Nano using a USBtinyISP is very straightforward: | + | Directly uploading a sketch to an Uno or Nano using a USBtinyISP is pretty |
- Configure your IDE to use the USBtinyISP: //Tools > Programmer " | - Configure your IDE to use the USBtinyISP: //Tools > Programmer " | ||
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When you upload a program using a programmer, you overwrite the bootloader. This means your board will no longer work with the conventional //Sketch > Upload// command in the IDE. However, getting the bootloader back is straightforward. | When you upload a program using a programmer, you overwrite the bootloader. This means your board will no longer work with the conventional //Sketch > Upload// command in the IDE. However, getting the bootloader back is straightforward. | ||
- | Uploading a bootloader to your micro is almost identical to uploading a program using a programmer. The only difference is that instead of uploading a program using //Sketch > Upload Using Programmer//, | + | Uploading a bootloader to your micro is almost identical to uploading a program using a programmer. The only difference is that instead of uploading a program using //Sketch > Upload Using Programmer//, |
After uploading the bootloader, you should be able to use //Sketch > Upload// again just as you always have. | After uploading the bootloader, you should be able to use //Sketch > Upload// again just as you always have. | ||
arduino/arduino_without_a_bootloader.txt · Last modified: 2022/05/30 05:46 by mithat