ESP32-S2-Saola-1 Support

[masterX244]

What pinout and changes are needed to use that board for flashing? Somehow the PlatformIO docs don't give a hint on how the Pin numbers map to the physical pins

[coelner]

https://github.com/atc1441/ZBS_Flasher/blob/main/ESP32_Flasher/platformio.ini

[env:lolin32_lite]
platform = espressif32@5.0.0
board = lolin32_lite
framework = arduino
#upload_port = COM17
upload_speed = 921600
#monitor_port = COM17
monitor_speed = 115200
build_flags = 
    -D LED=22
    -D ZBS_SS=23
    -D ZBS_CLK=18
    -D ZBS_MoSi=5
    -D ZBS_MiSo=17
    -D ZBS_Reset=19
    # do not connect directly to a GPIO only trough some kind of Mosfet or switch!
    -D ZBS_POWER=16 
    # Used to read UART data from the firmware running on the ZBS, not needed at all
    -D ZBS_RXD=4
    -D ZBS_TXD=2
    -D ZBS_SPI_BUS=VSPI

However it is a little bit confusing in the README, that it is named ESP32. As you can see here: https://mischianti.org/wp-content/uploads/2021/07/ESP32-WeMos-LOLIN32-Lite-pinout-mischianti.png or https://1.bp.blogspot.com/-mG0x8f0BKTA/WmiYamp9XdI/AAAAAAAAg5Y/N_P7plcbtmU-15JKqURYqE_yjt98AUdxwCLcBGAs/s1600/Lolin32_pinout03.png the pins are labeled after the GPIO number. Now it depends (AFAIK), which SAOLA pcb version you have. the versin 1.2 atleast do have the labeled pcb pins likewise to the GPIO numbers. However GPIO23 is not available, GPIO 18 is connected to the onboard RGB LED. Those need to be changed.

//Edit: https://docs.espressif.com/projects/arduino-esp32/en/latest/api/spi.html

  //initialise vspi with default pins
  //SCLK = 18, MISO = 19, MOSI = 23, SS = 5

completely unverified:

[env:esp32-s2-saola-1]
platform = espressif32
board = esp32-s2-saola-1
framework = arduino
#upload_port = COM17
upload_speed = 921600
#monitor_port = COM17
monitor_speed = 115200
build_flags = 
    -D LED=18
    -D ZBS_SS=34
    -D ZBS_CLK=36
    -D ZBS_MoSi=35
    -D ZBS_MiSo=37
    -D ZBS_Reset=19
    # do not connect directly to a GPIO only trough some kind of Mosfet or switch!
    -D ZBS_POWER=16 
    # Used to read UART data from the firmware running on the ZBS, not needed at all
    -D ZBS_RXD=4
    -D ZBS_TXD=2
    -D ZBS_SPI_BUS=HSPI

[masterX244]

Required HSPI instead of VSPI to compile, datasheet tells that, too.

[masterX244]

Verified, with HSPI instead of VSPI i was able to flash the tag.

[coelner]

I saw your pull request against the openepapertest repo, did you successful flash an AP firmware on the saola board? I tried that but I can't get the connection to the zbs243 working.

[masterX244]

I got it to work, maybe try crossing the UART RX/TX wires, that stuff is not 100% clear. YOu used the pinconfig from my PR?

[coelner]

It seems that two boards are broken. I tried it with an other one, which works. //Edit: AFAIK the esp32-s2 has got two UARTs, but they can be multiplexed to every gpio, which makes it possible to use the rgb led on pin 18 and shift the RXD to 16.