ESP32 Forum

Posted: **Mon May 15, 2023 7:04 pm**

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: [Select all] [Expand/Collapse]

Serial.println("Setting VSPI_SCK"):

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Code: [Select all] [Expand/Collapse]

#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() {}

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My platformio project:

Code: [Select all] [Expand/Collapse]

[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

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and the board definition:

Code: [Select all] [Expand/Collapse]

{
  "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?

Posted: **Tue May 16, 2023 8:31 am**

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.

ESP32 Forum

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

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

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