is it possible output 1024X768 with 64 colors?

[leodefpv]

hi your lib is so great and easy to use thanks for your great job that i can use esp32 out put VGA singal i want to use esp32 out put 1024X768 VGA singal with 64 color but it can't show all Viewport. At first i though it's memory problem so i change esp32 to WROVER type with PSRAM but it still not show all view and i print info like this

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ets Jul 29 2019 12:21:46

rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT) configsip: 0, SPIWP:0xee clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00 mode:DIO, clock div:1 load:0x3fff0030,len:1344 load:0x40078000,len:13864 load:0x40080400,len:3608 entry 0x400805f0 Screen size : 1024 x 768 Viewport size : 1024 x 179 Free memory (total, min, largest): 4268947, 4261043, 4128756

it doesn't appear to be using all available memory。 how can i use PSRAM to add Viewport size? Or it can't output 1024X768 with 64 color?

Thanks for your attention and reply！

[fdivitto]

PSRAM is not usable for DMA output

[leodefpv]

so it's impossible output 1024 X 768 with 64 color ?

[fdivitto]

64 colors require 6 bits, so 1024x768x6 = 4718592 bits = 589824 bytes = 576 KB, that is out of ESP32 specs!

[leodefpv]

Thank you for your answer if change the chip to esp32 S2 or S3 can the EDMA do this job to output 1024X768?

[fdivitto]

can the EDMA do this job to output 1024X768?

I'm sorry, I don't know! probably not, because PSRAM could not provide enough speed for 1024x768 dot frequency...or who knows what else kind of problem!

[leodefpv]

thank you! maybe S3 can do this i will try .

[leodefpv]

Esp32 S3 PSRAM speed is 12Mhz Is this fast enough to drive VGA?

[fdivitto]

1024x768 requires 44Mhz at least. Look at this for reference:

http://tinyvga.com/vga-timing

[defdefred]

I wonder if the "wifi" core of ESP32 could be hacked to become a more powerfull fabgl vga graphic card?