My bad, I should have posted in the esp8266 forum, the latest NodeMCU from LoLin has sdk 5.2 on it and this is what it does: print(uart.setup(0, 74880, 8, 0, 1, 1 )) ERROR Communication with MCU..Got answer! Communication with MCU established. AutoDetect firmware... Can't autodetect firmware, becaus...

I couldn't find a GPIO list with the pins or GPIO number I could sort so I made one:

More issues: ESP Technical Reference Table 16: GPIO Matrix Peripheral Signals What is "Direct I/O in IO_MUX" mean? I found my answer after a few more hours of reading, the thing that is throwing me is your use of GPIO labels instead of mapping to PIN numbers. I was believing that a PIN could have a ...

While working on the latest SDK I was trying to figure out the garbage on my screen every time I rebooted to discover 74880 baud would allow me to see what was being dumped to the screen. Is there a reason for 74880 instead of a standard baud rates? Some terminal programs do not have 74880 support a...

In Espressif documentation I've noticed that some times they use 0 (Zero) based numbering and other times it is based on 1 (One): SD_* is for the signals of the SDIO slave HS1_* is for the signals of the Port 1 of SDIO host HS2_* is for the signals of the Port 2 of SDIO host MT* is for the signals o...

The Technical Reference Manual section 4 goes over the options for pin muxing in details, but the short answer is "yes you can map most peripherals anywhere". Is there any documentation with example of: UART1 - TX, RX, RTS, CTS pins being assigned to GPIO MUX, DMA setup, Interrupts setup and enable...

SPIRAM: MR25H40MDF 4M as 512KX8 $21.82 qty 1 Earlier I had read we could add external SRAM as IRAM... I don't think so, maybe after it's moved into IRAM but this SPIRAM stuff is painful to work with. It has 1 byte writes, after you set it up and 40 clock cycles later your done. I could see it as a b...

I can't find where to post documentation errors: ESP32 Datasheet 3.1.3 External Flash and SRAM "ESP32 supports 4 X 16 MBytes of external QSPI Flash" this indicates 4 times 16MBytes "ESP32 supports up to 128 Mbits of external DUAL or QUAD SPI Flash memory" The SRAM issue: On the IO_MUX page where is...

I can't find where to post documentation errors: ESP32 Datasheet 3.1.3 External Flash and SRAM "ESP32 supports 4 X 16 MBytes of external QSPI Flash" this indicates 4 times 16MBytes "ESP32 supports up to 128 Mbits of external DUAL or QUAD SPI Flash memory" The SRAM issue: On the IO_MUX page where is ...

I must be missing something:
In order to use the three UART devices I have to have the FLASH (25Q64 in my design) wired to the pins for function 5. In your PIN strapping guide there is no means to tell your boot code to user function 5 SD access so how can I use U1RXD and U1TXD?