ESP32-S3-WROOM-1 loses CDC serial port when starting SPI

[mathijs]

Hi,

I've created a custom board using an ESP32-S3-WROOM-1 which is connected to a Wiznet W6100 chip over SPI. The ESP32S3 is connected to USB over pins 13/14 (GPIO19/GPIO20). I can flash the chip without problems.

The W6100 in SPI mode is connected to the following pins:
18 (GPIO10): chip select
19 (GPIO11): MOSI
20 (GPIO12): SCLK
21 (GPIO13): MISO

Every time I try to connect to the SPI device, the ESP32S3 loses its serial connection. Rebooting in the bootloader restores the connection. Changing the pins to input / output manually gives the same result.

Simplest version which crashes right after

Code: Untitled.c Select all

Serial.println("Setting VSPI_SCK"):

Code: main.cpp Select all

#include <Arduino.h>

#include <SPI.h>



#define VSPI_SCK 19

#define VSPI_MISO 21

#define VSPI_MOSI 20

#define VSPI_SS 18



void setup() {

  Serial.begin(115200);

  Serial.println("Starting");



  Serial.println("Setting VSPI_SS");

  pinMode(VSPI_SS, OUTPUT); //HSPI SS

  Serial.println("Setting VSPI_SCK");

  delay(1000);

  pinMode(VSPI_SCK, OUTPUT); //HSPI SS

  Serial.println("Setting VSPI_MISO");

  delay(1000);

  pinMode(VSPI_MISO, INPUT); //HSPI SS

  Serial.println("Setting SS");

  delay(1000);

  pinMode(VSPI_MISO, OUTPUT); //HSPI SS

  Serial.println("Init ethernet");

}



void loop() {}

My platformio project:

Code: platformio.ini Select all

[env:esp32-s3-custom]

platform = espressif32

board = custom_pcb

board_build.arduino.memory_type = dio_opi

framework = arduino

monitor_speed = 115200

build_flags = 

	-D PIO_FRAMEWORK_ARDUINO_ENABLE_CDC

	-D USBCON

	-DCORE_DEBUG_LEVEL=5

	-DBOARD_HAS_PSRAM

	-mfix-esp32-psram-cache-issue

lib_ldf_mode = deep+

lib_deps = 

	https://github.com/WIZnet-ArduinoEthernet/Ethernet.git

	adafruit/Adafruit NeoPixel@^1.11.0

and the board definition:

Code: custom_pcb.json Select all

{

  "build": {

    "arduino": {

      "ldscript": "esp32s3_out.ld",

      "partitions": "default_8MB.csv",

      "memory_type": "qio_opi"

    },

    "core": "esp32",

    "extra_flags": [

      "-DBOARD_HAS_PSRAM",

      "-DARDUINO_USB_MODE=1",

      "-DARDUINO_USB_CDC_ON_BOOT=1"

    ],

    "f_cpu": "240000000L",

    "f_flash": "80000000L",

    "flash_mode": "qio",

    "hwids": [

      [

        "0x303A",

        "0x1001"

      ]

    ],

    "mcu": "esp32s3",

    "variant": "esp32s3"

  },

  "connectivity": [

    "wifi"

  ],

  "debug": {

    "openocd_target": "esp32s3.cfg"

  },

  "frameworks": [

    "arduino",

    "espidf"

  ],

  "name": "custom_pcb",

  "upload": {

    "flash_size": "8MB",

    "maximum_ram_size": 327680,

    "maximum_size": 16777216,    

    "use_1200bps_touch": true,

    "wait_for_upload_port": true,

    "require_upload_port": true,

    "speed": 460800

  },

  "url": "https://www.google.nl",

  "vendor": "ME"

}

Does anyone have a clue what could cause this?

[Sprite]

pinMode and friends take the GPIO number, not the pin number. In other words, you're reconfiguring GPIO 19 and 20 and as such losing USB.