Off Topic: New Teensy 4.0 Released

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Never know if it might be useful with Maslow, but the new Teensy 4.0 is released. 600 MHz Cortex-M7 processor on it.

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600MHz processor, and it executes double, double functions like log(), sin(), cos() with FPU hardware. It sounds very interesting. Thanks for the alert.

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Iā€™ve been able to compile the v1.27 firmware for Teensy4.0 (3.5, 3.6) by updating the Encoder and TimerOne libraries. Hereā€™s the branch. It compiles, but doesnā€™t have pin assignments that would allow connecting to one of the PowerControl boards, yet. For now, Iā€™ll be out by the mailbox waiting for a deliveryā€¦:grin:

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The speed of it compared to a mega is extreme, but I wonder how that could be used to improve the machine. Could reducing the loopinterval be of any benefit?

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I have a Teensy 4 on the way as well. Are the updates just to get it to compile in ā€œUNO compatability modeā€ or does it actually use Teensy native peripherals or DMA?

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It compiles in full-on Teensy mode. The changes were minimal, Paul Stoffregen wrote those libraries as well as creating the Teensy seriesā€¦

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In the code I see switching interrupts on and off completely. That shouldnā€™t be necessary on any of the ARM processors with nested interrupt right? Teensy, ESP32, DUEā€¦ Encoder has priority over PWM which has priority over Coms. That could improve accuracy if we have been missing any pulses while interrupts were off.

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does it have eeprom? or does that still require an additional chip?

David Lang

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The Teensy core has been re-written to present part of its internal store as EEPROM and to use the stock EEPROM library calls. Not sure, but I think it uses 2K for that.

Edit - Teensy3.5 shows 4K. The Teensy4.0 sheet says ā€œ64K reserved for recovery & EEPROM emulationā€, the recovery is ā€˜Blinkā€™ and that compiles to a bit less than 4K, so thereā€™s probably a fair wad available for storage.

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Teensy 4 ordered!

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I didnā€™t realize just how teensy it would beā€¦ much more teensy than the 3.5

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Just like a box of cereal: ā€œImage enlarged to show texture.ā€ :slight_smile:

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Reminds me of the Adafruit trinket.

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Itā€™s based on the Teensy 3 / LC foot print.

Thank you

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It also has four hardware 32-bit quadrature encoder interfaces built inā€¦ unfortunately, thereā€™s not a recent grbl port for it.

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