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: [Select all] [Expand/Collapse]

1. Serial.println("Setting VSPI_SCK"):

GeSHi © Codebox Plus Extension

Code: [Select all] [Expand/Collapse]

1. #include <Arduino.h>
2. #include <SPI.h>
3.  
4. #define VSPI_SCK 19
5. #define VSPI_MISO 21
6. #define VSPI_MOSI 20
7. #define VSPI_SS 18
8.  
9. void setup() {
10.   Serial.begin(115200);
11.   Serial.println("Starting");
12.  
13.   Serial.println("Setting VSPI_SS");
14.   pinMode(VSPI_SS, OUTPUT); //HSPI SS
15.   Serial.println("Setting VSPI_SCK");
16.   delay(1000);
17.   pinMode(VSPI_SCK, OUTPUT); //HSPI SS
18.   Serial.println("Setting VSPI_MISO");
19.   delay(1000);
20.   pinMode(VSPI_MISO, INPUT); //HSPI SS
21.   Serial.println("Setting SS");
22.   delay(1000);
23.   pinMode(VSPI_MISO, OUTPUT); //HSPI SS
24.   Serial.println("Init ethernet");
25. }
26.  
27. void loop() {}

GeSHi © Codebox Plus Extension

My platformio project:

Code: [Select all] [Expand/Collapse]

1. [env:esp32-s3-custom]
2. platform = espressif32
3. board = custom_pcb
4. board_build.arduino.memory_type = dio_opi
5. framework = arduino
6. monitor_speed = 115200
7. build_flags =
8.     -D PIO_FRAMEWORK_ARDUINO_ENABLE_CDC
9.     -D USBCON
10.     -DCORE_DEBUG_LEVEL=5
11.     -DBOARD_HAS_PSRAM
12.     -mfix-esp32-psram-cache-issue
13. lib_ldf_mode = deep+
14. lib_deps =
15.     https://github.com/WIZnet-ArduinoEthernet/Ethernet.git
16.     adafruit/Adafruit NeoPixel@^1.11.0

GeSHi © Codebox Plus Extension

and the board definition:

Code: [Select all] [Expand/Collapse]

1. {
2.   "build": {
3.     "arduino": {
4.       "ldscript": "esp32s3_out.ld",
5.       "partitions": "default_8MB.csv",
6.       "memory_type": "qio_opi"
7.     },
8.     "core": "esp32",
9.     "extra_flags": [
10.       "-DBOARD_HAS_PSRAM",
11.       "-DARDUINO_USB_MODE=1",
12.       "-DARDUINO_USB_CDC_ON_BOOT=1"
13.     ],
14.     "f_cpu": "240000000L",
15.     "f_flash": "80000000L",
16.     "flash_mode": "qio",
17.     "hwids": [
18.       [
19.         "0x303A",
20.         "0x1001"
21.       ]
22.     ],
23.     "mcu": "esp32s3",
24.     "variant": "esp32s3"
25.   },
26.   "connectivity": [
27.     "wifi"
28.   ],
29.   "debug": {
30.     "openocd_target": "esp32s3.cfg"
31.   },
32.   "frameworks": [
33.     "arduino",
34.     "espidf"
35.   ],
36.   "name": "custom_pcb",
37.   "upload": {
38.     "flash_size": "8MB",
39.     "maximum_ram_size": 327680,
40.     "maximum_size": 16777216,    
41.     "use_1200bps_touch": true,
42.     "wait_for_upload_port": true,
43.     "require_upload_port": true,
44.     "speed": 460800
45.   },
46.   "url": "https://www.google.nl",
47.   "vendor": "ME"
48. }

GeSHi © Codebox Plus Extension

Does anyone have a clue what could cause this?

[ESP_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.