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| mithro | bibor: The + design hasn't been proven | 02:26 |
|---|---|---|
| mithro | bibor: And the software for doing 2 factor auth doesn't yet exist | 02:27 |
| mithro | bibor: But the actual base Tomu board works pretty well | 02:27 |
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| bibor | mithro: does hasn't been proven mean nobody bootet the chip yet or nobody wrote the 2 factor software yet? | 10:43 |
| mithro | bibor: For the Tomu+ with the NXP part, nobody has gotten blinking leds working yet | 10:43 |
| mithro | bibor: For the base Tomu, we have working blinking leds demo with USB | 10:44 |
| bibor | mithro: ah, cool, thx, then i will order parts for both | 10:46 |
| bibor | mithro: wants the problem with the nxp at the moment? usb? | 10:47 |
| mithro | bibor: The Tomu and Tomu+ also have different PCBs | 10:47 |
| mithro | bibor: The fact I only have two working boards and haven't had any time to investigate why it didn't just work out when soldered | 10:48 |
| bibor | mithro: i know :) but thats not the problem i've got access to a pcb mill, which has no problem with qfn packages | 10:49 |
| mithro | bibor: Ahh cool | 10:49 |
| mithro | bibor: As far as I can tell the PCB is fine | 10:49 |
| mithro | bibor: And I had openocd connected to the 2-wire debug and it seem to indicate the ARM was executing the included bootloader | 10:50 |
| bibor | mithro: but no other code worked? | 10:51 |
| mithro | bibor: It didn't appear on the USB bus when I plugged it in | 10:51 |
| mithro | bibor: and didn't have time to do investigate any more | 10:51 |
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| bibor | mithro: ok, next week all parts should be here, and i should have some time to play with it. i'll report my results | 10:54 |
| mithro | bibor: I'm thinking of maybe doing a Tomu design with this -> http://www.st.com/en/microcontrollers/stm32l442kc.html | 10:55 |
| tpb | Title: STM32L442KC - Ultra-low-power with FPU ARM Cortex-M4 MCU 80 MHz with 256 Kbytes Flash, USB, AES-256, DFSDM - STMicroelectronics (at www.st.com) | 10:55 |
| bibor | mithro: looks good, and stm32 devices in general have excellent toolchains | 11:00 |
| bibor | i don't really know at the moment how much performance is really needed | 11:01 |
| bibor | difficult to estimate | 11:01 |
| bibor | a riscV design would be cool, if hw availability would be better. i've got some chips laying around maybe i'm designing a riscV tomu for the lulz | 11:07 |
| mithro | bibor: I don't know of any riscv with crystaless USB | 11:14 |
| bibor | mithro: me too, but maybe you can do it with an RC-curcuit | 11:20 |
| mithro | To do USB2.0 you need a PLL | 11:21 |
| bibor | (and some filters for stabilizing) | 11:21 |
| bibor | the problem with discrete plls on such a tiny board is coupling, but i'm not that experienced that i could actually estimate if it would work | 11:29 |
| bibor | but nevermind. first with reliable hw :) | 11:29 |
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