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| tnt | Add one floating point function, see your .code size double :p | 06:07 |
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| xobs | tnt: very true, though depending on how exact you need, qfplib on Cortex-M0 can be nice: https://www.quinapalus.com/qfplib.html | 06:11 |
| tpb | Title: Qfplib: an ARM Cortex-M0 floating-point library in 1 kbyte (at www.quinapalus.com) | 06:11 |
| tnt | This was on risc-v | 06:12 |
| xobs | Ah. Can't help you there yet. | 06:13 |
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| acathla | Anybody tried to make an ADC on an iCE40 using the diffential inputs? | 16:04 |
| tnt | acathla: yeah. | 16:04 |
| tnt | (I'm actually writing some code related to that right now :p) | 16:05 |
| acathla | \o/ | 16:05 |
| acathla | in verilog/migen/...? | 16:06 |
| tnt | It's in verilog. | 16:07 |
| tnt | Actually I have that part already written, I'm just writing software code that deals with calibrating the output atm. | 16:07 |
| tnt | Currently I'm really just timing a capacitor charge / discharge (sort of dual slope). But actually I could try a delta sigma DAC using the same hw. | 16:09 |
| acathla | Is that code open? Online? | 16:10 |
| tnt | Not yet no. I don't push stuff publically until it actually works / does something useful. | 16:15 |
| xobs | tnt: I'd be interested in reading more about that. I have a silly idea to recreate a Chibitronics Love-to-Code with an ICE40 instead of a Cortex M0. | 16:16 |
| MadHacker | You know there's an open source arduino core, too? | 16:16 |
| MadHacker | (Atmel thingy of some sort) | 16:17 |
| MadHacker | I've got a 6502 running on an iCE40HX1K here just now too. :) | 16:17 |
| tnt | xobs: I'm not super familiar with it. IIRC that was why you wrote graiinum right ? I'm not sure to see the connection to ADC. | 16:18 |
| MadHacker | Calling it via migen because I thought it might be entertaining to try and get Litex running with smaller CPU cores. | 16:18 |
| MadHacker | tnt: The LtC needs ADCs. | 16:18 |
| MadHacker | Not least for the programming-over-audio input. | 16:18 |
| tnt | MadHacker: oh, right, I forgot about that feature. | 16:19 |
| MadHacker | You could convert it to a zero-crossing-detection only I suppose. | 16:19 |
| MadHacker | Be slow, though. | 16:20 |
| xobs | It does AFSK @ ~12000 baud. | 16:25 |
| xobs | Right now it's done in software on a 48 MHz Cortex M0+, and the demodulation alone uses ~50% of the CPU. | 16:31 |
| xobs | I think it would be interesting to make the audio decode stuff in hardware. Then we could actually add ECC, for example. | 16:31 |
| MadHacker | Might eat a surprising amount of space in the FPGA though. | 16:32 |
| MadHacker | Software is compact. | 16:32 |
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