Much more likely, some code or libraries may not play well with the nonstandard CPU speed. If this happens, try dialing back the speed by one notch and re-upload, see if it’s more stable. There is a small but nonzero chance of code locking up or failing to run entirely. But most creative tasks are less critical and operate in more comfortable settings, and we can push things a bit if we want more speed. Manufacturers often rate speeds conservatively because such devices are marketed for harsh industrial environments…if a system crashes, someone could lose a limb or worse. This option lets you adjust the microcontroller core clock…the speed at which it processes instructions…beyond the official datasheet specifications. If only the SPI pins keep their protocol functions, you can also do PWM on the following pins: The following pins can be configured for PWM without any signal conflicts as long as the SPI, I2C, and UART pins keep their protocol functions: Tracing the signals to the pins broken out on the Feather M0, the following pins can't do PWM at all: ![]() The SAMD21G used in the Feather M0 only has three TC instances with two output channels, and three TCC instances with eight output channels: The biggest members of the SAMD21 family have five TC instances with two 'waveform output' (WO) channels, and three TCC instances with eight WO channels:Īnd those are the ones shown in the datasheet's multiplexer tables. There are options for different kinds of waveform, interleaved switching, programmable dead time, and so on. The pins connected to a TC instance can output identical versions of the same PWM waveform, or complementary waveforms.Įach TCC instance has a single count register, but multiple compare registers and output channels. Either channel can be enabled and disabled, and either channel can be inverted. Each SAMD21 has multiple copies of each, called 'instances'.Įach TC instance has one count register, one control register, and two output channels. For example:Īfter looking through the SAMD21 datasheet, we've found that some of the options listed in the multiplexer table don't exist on the specific chip used in the Feather M0.įor all SAMD21 chips, there are two peripherals that can generate PWM signals: The Timer/Counter (TC) and Timer/Counter for Control Applications (TCC). Right above the first function definition in your code. Required for Serial on Zero based boards #if defined(ARDUINO_SAMD_ZERO) & defined(SERIAL_PORT_USBVIRTUAL) If you have existing sketches and code and you want them to work with the M0 without a huge find-replace, put However, on the off chance you are using the official Arduino SAMD core and not the Adafruit version (which really, we recommend you use our version because it’s been tuned to our boards), and you want your Serial prints and reads to use the USB port, use SerialUSB instead of Serial in your sketch. In the Adafruit M0/M4 Core, we fixed it so that Serial goes to USB so it will automatically work just fine. The USB port for the Official Arduino M0 core is called SerialUSB instead. For the Official Arduino SAMD/M0 core, this goes to the Serial5 port, which isn't exposed on the Feather. OK so technically it's more like a really tricked-out Feather than a Wing but we simply could not resist the Hallowing pun.ĩ9.9% of your existing Arduino sketches use Serial.print to debug and give output. 3.3V regulator with 500mA peak current output.JST ports for Neopixels, sensor input, and I2C (you can fit I2C Grove connectors in here).Mono Class-D speaker driver for 4-8 ohm speakers, up to 2 Watts, with mini volume pot.Two female header strips with Feather-compatible pinout so you can plug any FeatherWings in.USB port for battery charging, programming and debugging.LiPoly battery port with built in recharging capability. ![]() Light sensor, reverse-mount so that it points out the front.8 MB of SPI Flash for storing images, sounds, animations, whatever!. ![]() ATSAMD21G18 48MHz with 3.3V logic/power - 256KB of FLASH + 32KB of RAM.On the reverse is a smorgasbord of electronic goodies: There's also 4 fang-teeth below the display, these are analog/capacitive touch inputs with big alligator-clip holes. Our default example code has our spooky eye demo running but you can use it for anything you like to display in glorious color. On the front is a cute 1.44" sized 128x128 full color TFT.
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