Excellent SAMD21 Articles by Stargirl (Thea) Flowers
Jan 7, 2022 · If anyone's interested, I stumbled upon these excellent, visual and interactive SAMD21 articles by Stargirl (Thea) Flowers:
How to write programs for a custom SAMD21 board using Arduino IDE
Oct 12, 2021 · Hello everyone, I am designing a new board using ATSAMD21E17D processor. Originally the processor was ATSAMD21E17A, but since it was out of stock I switched it for "D" variant. I have …
Serial Ports for SAMD21 Xplained Pro? - Arduino Forum
Jun 13, 2024 · Hi I am currently using the SAMD21 Xplained Pro with the Arduino IDE and I am able to communicate with my PC using the EDGB but I can't seem to access the other serial ports on the …
Cannot get SAMD21 Interrupt to function - Arduino Forum
Jun 1, 2025 · I've been working on this for a couple of days. However I'm at a loss as to why my interrupt is not working. Issue is the variable (PWMcount) that should be incremented in the ISR is not …
SAMD21 implementation questions - 3rd Party Boards - Arduino Forum
Jun 26, 2019 · I haven't received any SAMD21 boards yet and can't test it, so I would be really grateful if someone that have tested it share their opinion about this chip and HID+serial. It should work fine, …
SAMD21 RTC internal oscillator extreme drift, but not for millis()?
Dec 15, 2020 · Hi jazzar, The SAMD21's 32.768kHz internal oscillator (OSC32K) isn't very precise. If used as a clock source for the RTC, expect an accuracy of ±20 minutes per day. It looks like your …
XIAO SAMD21 I2C master/slave - Programming - Arduino Forum
Sep 13, 2024 · Arduino Core for SAMD21 CPU. Contribute to arduino/ArduinoCore-samd development by creating an account on GitHub. From my understanding the slave should print the value of x sent …
PWM generation for a very low duty cycle and phase shifting capabiliy ...
Mar 27, 2020 · Hello forum, long time reader first writer as they say 😉 I need to generate a very low duty cycle PWM ( like between 1 and 5 % ) on a Samd21 M0 and be able to phase shift it dynamically I've …
SAMD21 External ADC reference - 3rd Party Boards - Arduino Forum
Oct 28, 2022 · I'm trying to get stable analog readings with a SAMD21 (currently prototyping with a MKRZero but I'll be making a custom board). I've noticed that applying a stable reference voltage to …
Using internal ADC gain modes of M0 Arduino / SAMD21
Jun 28, 2016 · Besides that I am drifting away from the solution of using the SAMD21 chip. At first it was promising for it's internal RTC, 12-bit ADC with gain, in my case a micro-sd storage-solution and first …