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Grand Central M4: D9 (PB02) has wrong EXTERNAL_INT in variant.cpp — attachInterrupt(9) never fires

Status: Open.

#394In adafruit/ArduinoCore-samd;

· Mr-Champagne-TCM opened on Jul 28, 2026

analog_read() sampling rate is much slower than wiring.c thinks it is

Status: Open.

#387In adafruit/ArduinoCore-samd;

· mzero opened on May 10, 2026

Make 48M DFLL more accurate again on crystal based boards

Status: Open.

#386In adafruit/ArduinoCore-samd;

· mzero opened on May 1, 2026

Integrated support for DMA into SERCOM for SPI/UART/Wire

Status: Open.

#382In adafruit/ArduinoCore-samd;

· crabel99 opened on Jan 27, 2026

PlatformIO does not choose newer Adafruit TinyUSB

Status: Open.

#379In adafruit/ArduinoCore-samd;

· DaAwesomeP opened on Nov 5, 2025

SPI on Adafruit Metro M0 Express

Status: Open.

#357In adafruit/ArduinoCore-samd;

· nerdyscout opened on Apr 22, 2024

SAMD51(J19) revision F DMA issues with 2 identical TCCx trigger source

Status: Open.

#356In adafruit/ArduinoCore-samd;

· flety-emmanuel opened on Mar 18, 2024

Feather M4 Express no PWM out on RX (0) or TX (1)

Status: Open.

#349In adafruit/ArduinoCore-samd;

· caternuson opened on Aug 4, 2023

analogRead() freezing on several Trinkey boards

Status: Open.

#343In adafruit/ArduinoCore-samd;

· caternuson opened on May 18, 2023

Reading Analog Inputs with 12-bit resolution not working on SAMD51

Status: Open.

#342In adafruit/ArduinoCore-samd;

· DevonReynolds opened on Mar 24, 2023

UART SERCOM ref clock seems to be Main 120MHz, not SERCOM_FREQ_REF = 48MHz

Status: Open.

#341In adafruit/ArduinoCore-samd;

· SimonMerrett opened on Mar 22, 2023

SPI DMA write-only transfer(txBuf, nullptr, count) corrupts following receives.

Status: Open.

#335In adafruit/ArduinoCore-samd;

· greiman opened on Aug 15, 2022