Search found 11 matches

by Xavi92
Mon Jun 10, 2019 4:21 pm
Forum: Hardware
Topic: How to use I2S along with 8-bit parallel bus
Replies: 4
Views: 662

Re: How to use I2S along with 8-bit parallel bus

As shown below, a complete screen takes ~38 ms, but the tearing effect signal (see D4) asserts every 24 ms. 480 x 320 x 2bpp = 307200 bytes are being sent there, so this approaches to ~8 Mbytes per second. However, is there any way to make I2S1 transfer shorter than 24 ms? https://i.postimg.cc/Y9RWM...
by Xavi92
Tue Jun 04, 2019 7:10 pm
Forum: Hardware
Topic: How to use I2S along with 8-bit parallel bus
Replies: 4
Views: 662

Re: How to use I2S along with 8-bit parallel bus

I don't see anything particularly sketchy in your code, but you are aware that the I2S peripheral shifts out the bytes in a weird way? If I recall correctly, a word like 0x12345678 would be sent as 0x34, 0x12, 0x78, 0x56. You probably need to shift your DMA data in a similar way. I can confirm such...
by Xavi92
Mon Jun 03, 2019 5:06 pm
Forum: Hardware
Topic: Driving an 8-bit parallel 8080 bus using I2S
Replies: 25
Views: 4284

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

I'm pretty much having the same issues you have described as well. I am using a ILI9481-based (480x320 pixels) display along with I2S+DMA. I have played around with the APLL_CLK with no success so far, so I am sticking with the default clock source for the time being. Even if the screen seems to get...
by Xavi92
Thu May 30, 2019 5:15 pm
Forum: Hardware
Topic: How to use I2S along with 8-bit parallel bus
Replies: 4
Views: 662

Re: How to use I2S along with 8-bit parallel bus

Hi Sprite, Sorry for the delayed answer. I did some more tests and got to send buffer as expected, as shown at the image below (I am filling a buffer with 0xFFFF and 0x0000): https://i.postimg.cc/KznfqT5q/Screenshot-20190530-185304.png However, if I control I2S1.conf.tx_start manually (setting it be...
by Xavi92
Thu May 23, 2019 3:00 pm
Forum: Hardware
Topic: How to use I2S along with 8-bit parallel bus
Replies: 4
Views: 662

How to use I2S along with 8-bit parallel bus

Hi there, For some weeks now I have trying to interact with a ILI9481-based TFT screen with no much success so far. My intention is to use one of the available I2S peripherals to send the following signal: https://i.postimg.cc/MKfYyLfq/ideal-WR.png Since the LCD uses 16bpp format, 2 WR clocks per pi...
by Xavi92
Mon Apr 29, 2019 7:48 pm
Forum: Showcase
Topic: New c-style OOP scripting framework and IDE
Replies: 5
Views: 2141

Re: New c-style OOP scripting framework and IDE

Mate, your job looks absolutely amazing. :shock: Where can I get this tool from?
by Xavi92
Mon Apr 15, 2019 1:40 pm
Forum: Showcase
Topic: JTAG Debugger that fits most ESP32 Projects
Replies: 12
Views: 4782

Re: JTAG Debugger that fits most ESP32 Projects

Altera USB Blaster cheap clones e.g.: https://bit.ly/2UfJLTx can be also used for the ESP32 with moderate success. Check out this post.
by Xavi92
Sat Apr 13, 2019 10:26 am
Forum: Hardware
Topic: Improving debug speed on an Altera USB Blaster clone
Replies: 6
Views: 1698

Re: Improving debug speed on an Altera USB Blaster clone

I have tested the same configuration on another computer as in my first post with much better results: flashing a 102400 bytes image took 21.19s (4.719 KiB/s), which is between 4 and 5 times faster than my previous results. Debugging is also much more enjoyable, as step instructions take around 2-5 ...
by Xavi92
Mon Apr 08, 2019 1:32 pm
Forum: Hardware
Topic: Improving debug speed on an Altera USB Blaster clone
Replies: 6
Views: 1698

Re: Improving debug speed on an Altera USB Blaster clone

Thanks for your help, I'll then get one of those. Would it be possible to include the info I wrote above somewhere in the docs so other people know about the limitations of using a cheap USB Blaster clone?
by Xavi92
Mon Apr 01, 2019 1:59 pm
Forum: Hardware
Topic: Improving debug speed on an Altera USB Blaster clone
Replies: 6
Views: 1698

Re: Improving debug speed on an Altera USB Blaster clone

Hi Angus, Thanks for your quick response. It is a shame the adapter itself is to blame, but I guess $3 was in fact too cheap. However, back when I bought it I was (and still am) unsure of which FT2232H-based adapter would do the trick. Would you recommend this one ? Are there any cheaper alternative...

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