Search found 4 matches

by neodata
Sun Aug 13, 2017 7:15 pm
Forum: General Discussion
Topic: ESP 32 SPI DMA Questions
Replies: 13
Views: 22268

Re: ESP 32 SPI DMA Questions

Please find some rechearch I've done in video ... what you can be acheived ... real time of course ... step by step : ( Videos from my FB page with public share ) Step 1 : https://goo.gl/fwSoK6 Step 2 : https://goo.gl/XoEfs4 Step 3 : https://goo.gl/GThJvU Step 4 : https://goo.gl/bPfpvN Out of CPU pe...
by neodata
Fri May 05, 2017 11:58 pm
Forum: ESP-IDF
Topic: LCD SPI & I2S - Serial & Parallel - Speed vs Ressources
Replies: 6
Views: 13262

Re: LCD SPI & I2S - Serial & Parallel - Speed vs Ressources

Hi Aromo1, Sure, here is the link : https://github.com/igrr/esp32-cam-demo I take the opportunity to add an update on SPI vs DMA vs 4Kb limit. This is solved in esp-idf latest release ( spi_bus_config_t > max_transfer_sz ). Everything works fine now, one call for a full frame transfert using DMA @ 7...
by neodata
Wed Apr 26, 2017 3:40 am
Forum: ESP-IDF
Topic: LCD SPI & I2S - Serial & Parallel - Speed vs Ressources
Replies: 6
Views: 13262

Re: LCD SPI & I2S - Serial & Parallel - Speed vs Ressources

Hi Sprite, Thx for your feedback, yes I'm using esp-idf driver. Looking forward for your update on the spi driver without this 4K limitation and indeed transfert entirely in DMA is the way to go. Regarding I2S, thank you for the code ... good starting point :-) ... will update this post on both solu...
by neodata
Tue Apr 25, 2017 6:15 pm
Forum: ESP-IDF
Topic: LCD SPI & I2S - Serial & Parallel - Speed vs Ressources
Replies: 6
Views: 13262

LCD SPI & I2S - Serial & Parallel - Speed vs Ressources

Hi Everyone, I'm looking for the most efficient solution to interface an TFT screen to the ESP32. SPI Pro > Working fine @ 80MHz > Full screen update 320 x 240 ( 153600 Bytes ) in 16.80ms and only a few GPIO Used SPI Cons > DMA transfert limited to ~ 4Kb ... CPU busy to transfert block by block in a...