Hello,

I'm working on an application where high-speed access to a framebuffer is critical, which resides in PSRAM. The framebuffer is processed and the result is stored in a queue, from which data is consumed by the LCD peripheral.
Afaik, the ESP32 S3 PSRAM should in the capable of reading at 80 ...

All right, I'll try that. Thank you for your help!

Hi, ESP_Sprite,
thanks for the informative answer. That's good to know. I need the second core for computation unfortunately, so switching to the S2 wouldn't help much. But at least I know I'm not leaving that performance on the table because of stupidity.

Another question if you don't mind: Do you ...

Hi WiFive,
Yes, the Workaround is disabled in menuconfig and the minimum chip revision is set to 3.
The serial debug output on satrtup seems reasonable:

I (32) boot: chip revision: 3
I (36) qio_mode: Enabling default flash chip QIO
I (41) boot.esp32: SPI Speed : 80MHz
I (46) boot.esp32: SPI Mode ...

Interestingly, when switching the above code to use memcpy() instead of reading *(test++) in a loop, i get up to 25.7 MB/s. So I can go above 20MB/s, but cannot quite reach 40. I already tried to reduce the freeRTOS tick rate, etc. to prevent context switches from interfering, but that doesn't ...

Hi, sorry to revive this, but I'm still struggling.
The following code:

double GetTime() { return (double)esp_timer_get_time() / 1000000; }

int IRAM_ATTR RamTest()
{
int rs[] = { 1,2,4,8,16,32,64,128,256,512,1024,2048,3600 };
printf("Ram Speed Test!\n\n");
uint32_t xx = 0;
for (int a = 0; a ...

Hello,

Finding this forum very helpful as a silent reader, I now hope to get my own question answered as well :)
I'm working on a E-Ink driver board based on the ESP32 (https://hackaday.io/project/168193-epdiy-976-e-paper-controller). Those displays are driven by scanning an active matrix and ...