ESP32 internal MAC + external PHY. You won't achieve those transfer speeds with external MACs.

Only saw you post now, so my answer may not be relevant anymore but may help others in the future. If you use Ethernet, GPIO0 is taken either as clock input or output and CLK_OUT1 cannot be used other than for 50MHz. You are also limited in the clock frequencies you can configure for I2S if the APLL...

No bug. Just the order of initialization is wrong in above code. Refer to https://esp32.com/viewtopic.php?f=2&t=3308

And your code works as well once the order of initialization is modified. See below code which outputs nice 50MHz on GPIO16. // Enable the I2S peripheral periph_module_enable(PERIPH_I2S0_MODULE); // // Configure Audio PLL to 100 MHz. // Note: sdm2 seems limited to 12 for some reason. // // f_xtal (s...

I managed to generate clean 50MHz using the Audio PLL and I2S using the following code. Signal is routed to GPIO0. // Enable the I2S peripheral periph_module_enable(PERIPH_I2S0_MODULE); // // Configure Audio PLL to 100 MHz. // Note: sdm2 seems limited to 12 for some reason. // // f_xtal (sdm2 + sdm1...

- Support for larger flash memory or support for adding a 2nd flash memory chip to extend flash - USB - CAN bus with a slower clock source so we can support all standard CAN bitrates (currently 10kbps and 20kbps are not possible) - 2 more UARTs (once you add a 4G modem and GPS you quickly run out of...

@fri.sch Most of the support I added is for half-duplex operation, so you must not send while receiving and you must wait until the other sender is quiet before your side starts sending. Otherwise you get collisions and the data will be garbled.

@aaquilina Today I started working on the RS-485 code again, and I also have this phantom null character at the end of each transmission. I investigated this further with different line driver circuits. Circuit A) +---------------+ RX <-------| R | | B|---- TX ------->| D MAX485 | ESP32 | | RS-485 s...

Thanks to both rudi and ESP_igrr for all the info and clarifications provided in this thread.

Would the Ethernet still work with lowered APB Clock ? I would expect it as the clock comes from an external source.