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by Deouss
Tue Jun 11, 2019 12:11 pm
Forum: General Discussion
Topic: espressif's "Chip7 2-2-A" spotted in the wild
Replies: 45
Views: 6446

Re: espressif's "Chip7 2-2-A" spotted in the wild

Any dates yet we could expect the final announcement?
by Deouss
Mon Jun 03, 2019 11:52 am
Forum: Hardware
Topic: Driving an 8-bit parallel 8080 bus using I2S
Replies: 24
Views: 2688

Re: Driving an 8-bit parallel 8080 bus using I2S

I've already tried the GPIO w1ts/w1tc byte permutation trick with a lookup table that some YouTuber made and it's not really fast. It goes up to 38FPS and the tearing is very significant and ugly. It also doesn't utilize DMA, but it's all just bitbanging. I don't think that assembly would help ther...
by Deouss
Mon Jun 03, 2019 1:27 am
Forum: Hardware
Topic: Driving an 8-bit parallel 8080 bus using I2S
Replies: 24
Views: 2688

Re: Driving an 8-bit parallel 8080 bus using I2S

I heard on some hacker forums Bituni simple ripped that code off of someone else's project. Not sure but this code looks a bit sloppy and it is heavy mixed with Arduino. If you look at I2S technical reference info there are a lot of functionalities that are untouched by most of the code out there. I...
by Deouss
Sat May 25, 2019 4:19 pm
Forum: Hardware
Topic: Writing to GPIO_OUT_REG to only specific pins
Replies: 4
Views: 219

Re: Writing to GPIO_OUT_REG to only specific pins

Thanks. Well I use whole word only with needed bits so masking is not necessary.
Actually XOR operation might not be needed and data will be precalculated ready to write)
I want to use assembler instructions to repeat inline few times for speeding execution.
by Deouss
Fri May 24, 2019 2:10 pm
Forum: Hardware
Topic: Writing to GPIO_OUT_REG to only specific pins
Replies: 4
Views: 219

Re: Writing to GPIO_OUT_REG to only specific pins

So operations steps would be:

val => W1TS
val ~= val
val => W1TC

How that would look in asm ?
by Deouss
Fri May 24, 2019 1:40 pm
Forum: General Discussion
Topic: espressif's "Chip7 2-2-A" spotted in the wild
Replies: 45
Views: 6446

Re: espressif's "Chip7 2-2-A" spotted in the wild

May I ask - why not 2 cores?

:?:
by Deouss
Thu May 23, 2019 4:23 pm
Forum: Hardware
Topic: Writing to GPIO_OUT_REG to only specific pins
Replies: 4
Views: 219

Writing to GPIO_OUT_REG to only specific pins

Let's say I want to set 12 bits/pins simultaneously with specific values 0/1 to gpio output register but I do not want to change other bits - must be done with one 32bit word write and possibly one write instruction. Do I have to disable/enable bits with mask first? I don't want to change settings o...
by Deouss
Tue May 21, 2019 3:05 am
Forum: General Discussion
Topic: New Chip ESP32-S2
Replies: 13
Views: 2246

Re: New Chip ESP32-S2

I have a feeling there will be also same chip with 2 cores and maybe BT
LCD and camera support looks great - I hope it is not through I2S only.
Also if all that extra 128MB spiram is fully addressable in continuous blocks this is a huge hardware improvement.
by Deouss
Fri May 17, 2019 11:27 pm
Forum: General Discussion
Topic: Two Esp32 modules sharing same memory
Replies: 1
Views: 469

Two Esp32 modules sharing same memory

Is it possible to connect two separate Esp32 modules in a way that they could share and access same memory?
If so - how? And would it be easy to implement in SDK?
by Deouss
Thu May 09, 2019 3:25 pm
Forum: Showcase
Topic: I2S-parallel example: Drive a 64x32 display
Replies: 60
Views: 30220

Re: I2S-parallel example: Drive a 64x32 display

I wonder if the display process can be done only by CPU. I tried to drive it without I2S and it worked however my panel seems to have very strange behavior. There is something related to OE pin - must be triggered after every row or I am doing something wrong. They specify OE as active low so it act...

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