Search found 90 matches

by ahenshaw
Fri Jan 11, 2019 5:06 pm
Forum: startKIT
Topic: Blue Pill for XMOS?
Replies: 3
Views: 657

Re: Blue Pill for XMOS?

Yeah, I guess I meant something current and XMOS supported. The StartKit was cool, but the form-factor was so awkward that I'm sure that it impacted the use by hobbyists.
by ahenshaw
Wed Jan 09, 2019 9:45 pm
Forum: startKIT
Topic: Blue Pill for XMOS?
Replies: 3
Views: 657

Blue Pill for XMOS?

It really seems odd that we can't get a development board for XMOS similar to the Blue Pill for the STM32: https://wiki.stm32duino.com/index.php?title=Blue_Pill.
I could see this as being rather popular.
by ahenshaw
Mon Jul 16, 2018 7:42 pm
Forum: Other XMOS Development Kits
Topic: Barebones xCore dev board
Replies: 3
Views: 5127

Re: Barebones xCore dev board

RISC-V has an Arduino-like board out, already ($59) . I'd sure like to see an XCORE-200 packaged like that.
https://www.sifive.com/products/hifive1/
by ahenshaw
Mon Mar 06, 2017 5:22 am
Forum: Projects
Topic: "Anacon-xC" Retro Analog Video Console
Replies: 8
Views: 9279

Re: "Anacon-xC" Retro Analog Video Console

Really, really impressive! I'd like to see some video, when you get a chance.
by ahenshaw
Fri Sep 09, 2016 7:16 pm
Forum: Applications
Topic: Fixed point math routines
Replies: 14
Views: 10111

Re: Fixed point math routines

I think you'll need to do a range reduction to use the polynomial approach, though. This may not be suitable. See this:
http://stackoverflow.com/questions/7378187/approximating-inverse-trigonometric-funcions
by ahenshaw
Fri Sep 09, 2016 7:10 pm
Forum: Applications
Topic: Fixed point math routines
Replies: 14
Views: 10111

Re: Fixed point math routines

You can calculate arcsin from a reasonably simple infinite series. Look at: https://en.wikipedia.org/wiki/Inverse_trigonometric_functions#Infinite_series and choose a suitable cutoff point. Arccos can be derived from that as arccos(z) = pi/2 - arcsin(z). Someone on stackexchange provided this as a p...
by ahenshaw
Wed May 04, 2016 7:55 pm
Forum: Applications
Topic: Massive data to store in flash memory
Replies: 5
Views: 6201

Re: Massive data to store in flash memory

Can you switch to another device that has a "small sector erase" option, such as the On Semiconductor LE25S161? Like the device that you are using, it has a 64K-byte sector size, but it appears to also support a 4K-byte sector erase size.

LE25S161 Datasheet
by ahenshaw
Thu Apr 21, 2016 7:43 pm
Forum: Development Tools and Programming
Topic: SPI Asynchronous Master - MODE_0 works, MODE_1 doesn't
Replies: 8
Views: 6697

Re: SPI Asynchronous Master - MODE_0 works, MODE_1 doesn't

Any progress on this? My project is at a standstill, right now.

Apparently the unit tests for this library only include tests for MODE_0 and MODE_3. This makes sense, since those are the only two modes that work -- MODE_1 and MODE_2 do not.