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| mazzoo | I am still playing with picosoc FW on an ice40 8k breakout board | 16:31 |
|---|---|---|
| mazzoo | to see real world performance, I toggle the LEDs with this code: https://pastebin.com/AurTNG45 | 16:32 |
| tpb | Title: [C] void blink(void) { while(1) { __asm__ volatile( - Pastebin.com (at pastebin.com) | 16:32 |
| mazzoo | I expect 50% duty cycle on the LEDs with 6MHz (or a small divider) | 16:32 |
| mazzoo | but I see this waveform: https://imgur.com/a/Re8TJ | 16:32 |
| tpb | Title: Imgur: The magic of the Internet (at imgur.com) | 16:32 |
| mazzoo | when I zoom on the short pulse its 2MHz-ish: https://imgur.com/a/0M90K | 16:33 |
| tpb | Title: Imgur: The magic of the Internet (at imgur.com) | 16:33 |
| mazzoo | can anyone point me to an explanation or has a clue why it's not 50% dc and way faster? | 16:34 |
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| mazzoo | synthesis says 30MHz, and "Checking 83.33 ns (12.00 MHz) clock constraint: PASSED." | 16:49 |
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| daveshah | mazzoo: What SPI flash mode are you using? | 17:04 |
| daveshah | That will affect instruction fetch performance | 17:04 |
| mazzoo | SPI State: LATENCY 8 | 17:04 |
| mazzoo | oooh right, almost forgot there's no i-cache | 17:05 |
| * mazzoo tweaks | 17:06 | |
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| mazzoo | set_flash_latency(0); keeps the same timing | 17:16 |
| mazzoo | but understanding the point makes me feel way more comfortable =) | 17:16 |
| mazzoo | there's still my Q from yesterday wrt to that POV heart code, that I don't quite get | 17:17 |
| ZipCPU | daveshah: Have you used picorv? I haven't, so I really don't know how to address all of mazzoo's questions. | 17:21 |
| daveshah | ZipCPU: yes, thanks for pinging me | 17:25 |
| daveshah | mazzoo: Yep, sounds like you've understood the flash correctly | 17:26 |
| daveshah | What was your POV heart question? | 17:26 |
| daveshah | You might be able to set your flash to QSPI or even QSPI DDR if your chip and board are capable | 17:26 |
| mazzoo | basically a C-weiredness (for me) see this code: https://pastebin.com/0v8fWRu8 | 17:27 |
| tpb | Title: [C] // -------------------------------------------------------- #define LEN_HEART - Pastebin.com (at pastebin.com) | 17:27 |
| daveshah | But that may require bodging on some boards | 17:27 |
| mazzoo | I can't declare sign_heart outside of the function, even as static it won't work. what am I missing? | 17:27 |
| daveshah | I think it is a linker script issue with picoRV32 | 17:28 |
| daveshah | I've seen something like it before | 17:28 |
| mazzoo | daveshah: ya, thanks, understanding is fine for me now. I guess the flash is not QSPI capable | 17:28 |
| daveshah | Can you try this linker script? | 17:28 |
| daveshah | https://github.com/mmicko/micropython/blob/master/ports/picorv32/sections.lds | 17:28 |
| tpb | Title: micropython/sections.lds at master · mmicko/micropython · GitHub (at github.com) | 17:28 |
| daveshah | I'm pretty sure static variables should work with that | 17:29 |
| daveshah | The flash is probably QSPI capable, but the board might need extra wires btw | 17:29 |
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| mazzoo | WOW | 17:32 |
| mazzoo | daveshah: like a charm | 17:32 |
| mazzoo | thanks! | 17:32 |
| daveshah | No worries! Thank Miodrag who fixed it in the first place | 17:32 |
| mazzoo | he should kick a pull request for clifford | 17:33 |
| daveshah | I'll ping him to do that | 17:37 |
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| mazzoo | clifford: thou shall use that last URL as linkerscript in picosoc - thee static global data work, lo! | 17:50 |
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| daveshah | A PR has now been made: https://github.com/cliffordwolf/picorv32/pull/61 | 18:13 |
| tpb | Title: Created lds file (section mapping) and init for data and bss sections by mmicko · Pull Request #61 · cliffordwolf/picorv32 · GitHub (at github.com) | 18:13 |
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| mithro | Should yosys ever generate "dangling nets" or should they have been removed / optimized away? | 23:04 |
| awygle | i think you're supposed to kill them with "clean" | 23:05 |
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