VS Arduino - Writing to/from Registers for SAMD51 Chip Family

Dec 18^th, 2025 at 9:52am (UTC)

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VS Arduino › Visual Micro › General Board › Writing to/from Registers for SAMD51 Chip Family

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Writing to/from Registers for SAMD51 Chip Family (Read 2965 times)

Phillip A. Gonzales Junior Member Offline Posts: 18 Joined: Jun 19^th, 2019	Writing to/from Registers for SAMD51 Chip Family Jul 9^th, 2019 at 1:20am	Print Post
	I am trying to write to the registers on the ATSAMD51J19A on the Adafruit Metro M4 Express. Trying to use macros such as the AVR lib does with DDRD or PORTD to assign pins on the Uno. From what I have gathered you need to use the macros found at C:\Users\[your user name ice\ATMEL\samd51 which is included when you #include "Arduino.h" in a .ino file However, I am unsure how to implement it as this chip has offsets from base stacks for many of the chips built-in functionalities, unlike the AVR chipsets. I am looking at using this method of bit-manipulation within ISR's to optimize the amount of time the code is stuck in the ISR. Please let me know if anyone out there has been able to utilize any of the many native functionalities present on the SAMD51 via registers.


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Tim@Visual Micro Administrator Offline Posts: 12203 Location: United Kingdom Joined: Apr 10^th, 2010	Re: Writing to/from Registers for SAMD51 Chip Family Reply #1 - Jul 9^th, 2019 at 11:35am	Print Post
	It's quite an advanced discussion. The best place for this question might be the arduino forum or an Atmel forum. I can say that often these things are defined in \variants folder of each core. Of you find a single file that could be redefined or changed you can override the core by placing a file of the same name in the project and enabling the vMicro>Compiler>Allow overrides menus. Alternatively whilst the arduino.h might #include some things you can override the main.cpp by including a copy of the main.cpp in your project. To see the core more easily use "vMicro>Show hidden files".


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Phillip A. Gonzales Junior Member Offline Posts: 18 Joined: Jun 19^th, 2019	Re: Writing to/from Registers for SAMD51 Chip Family Reply #2 - Jul 9^th, 2019 at 2:26pm	Print Post
	Thank you for the direction, Tim. I have found a post https://forum.arduino.cc/index.php?topic=334073.0 that seems to do just the trick for the SAMD21 on the Arduino Zero. The SAMD21 and SAMD51 should be similar enough to be able to understand the logic for register manipulation. I will be trying to digest the post further later on today and write back.


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Tim@Visual Micro Administrator Offline Posts: 12203 Location: United Kingdom Joined: Apr 10^th, 2010	Re: Writing to/from Registers for SAMD51 Chip Family Reply #3 - Jul 9^th, 2019 at 2:53pm	Print Post
	Yes that looks easier. Thanks


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