LilyPi USB

[noranger]

How can the USB ports switched on constantly. digitalWrite(EXTERN_USB_EN, HIGH); or ttgo->turnOffUSB(); only works for a second after booting.

[lewisxhe]

TurnOnUSB only sets GPIO33 to HIGH. If you operate on IO33 externally, it may be affected

[noranger]

Gpio 33 is reserved for UART_TX, but i need power. Gpio33 is not used by turnOnUSB().

[lewisxhe]

I made a mistake. The USB enable uses GPIO4, while the relay of LilyPi uses GPIO32 Do you use GPIO4 anywhere else?

[noranger]

No

[lewisxhe]

Please use the simplest test code to just set GPIO4 to HIGH and see if USB will maintain output

void setup()
{
pinMode(4,OUTPUT);
digitalWrite(4,HIGH);
}

void loop(){
}

[noranger]

Only Power after booting for 20ms. My Code for Setup.

//boardmanager esp32 Wrovwer Modul (LilyPi)

define LILYGO_LILYPI_V1

define LILYGO_BLOCK_ST7796S_MODULE //Use ST7796S

define LILYGO_WATCH_LVGL //To use LVGL, you need to enable the macro LVGL

include

include

include

Serial_CAN can;

define can_tx 33 // tx of serial can module

define can_rx 12 // rx of serial can module

define CAN_RATE_250 15

unsigned char flagRecv = 0; unsigned long id = 0; unsigned char rxBuf[8]; char str[20];

int temp=0; int temp2=0; int kreis1=0;int kreis2=0;int kreis3=0;int gang=125;int retarder=0;int mbremse=0;int gewicht=0;int partikelf=0; char Motortemp[4]; char Intarder[4]; char Gear[4]; char Exhaustbrake[4];

TTGOClass *ttgo;

void setup() { Serial.begin(115200);SPI.begin();

//pinMode(EXTERN_USB_EN, OUTPUT); pinMode(4, OUTPUT); digitalWrite(4, HIGH);Serial.println("USB On");

//Get watch instance
ttgo = TTGOClass::getWatch();
ttgo->begin(); 
//ttgo->openBL();// Turn on the backlight

ttgo->tft->setRotation(1); ttgo->tft->setTextFont(4);
ttgo->tft->fillScreen(TFT_BLACK);ttgo->tft->setTextColor(TFT_WHITE,TFT_BLACK);

can.begin(can_tx, can_rx, 115200);      // tx, rx

if(can.canRate(CAN_RATE_250))
{Serial.println("set can rate ok");}
else
{Serial.println("set can rate fail");}

.......

[lewisxhe]

There is no problem with the code. Are you connected to an external load? Please remove the USB load and try to see if this happens. I suspect that the current of the external load is too large, which causes the USB current-limiting start

[noranger]

Yes. Now the Usb power is on all ports. I testet it with a led. 3v and 5v switching works too. The Serialcanbusboard is now making problems. Thanks for your fast help.