Detect USB plugged in?

[kjm1102]

Apparently the esp32 has a register that detects if the usb is plugged in? https://www.esp32.com/viewtopic.php?t=26380 and https://www.esp32.com/viewtopic.php?t=31293 Just wondering if it's possible to read it from upython? Maybe an atomic_bitmask _read() or something?

[karfas]

What are you trying to do ?
The ESP32 has no USB support at all. The ESP32-S3/C3/?? variants have some USB support; you might be able to find the details (registers, etc) in the datasheets.

[rkompass]

You seem to refer to this piece of code:

int is_plugged_usb(void){
    uint32_t *aa = USB_SERIAL_JTAG_FRAM_NUM_REG;
    uint32_t first = *aa;
    vTaskDelay(pdMS_TO_TICKS(10));
    return (int) (*aa - first);
}

which refers to C code headers included that are part of the IDF that are specific for each esp device.
Searching through the code for the ESP32-C3 gave:
#define DR_REG_USB_SERIAL_JTAG_BASE 0x60043000 and
#define USB_SERIAL_JTAG_FRAM_NUM_REG (DR_REG_USB_SERIAL_JTAG_BASE + 0x24).
If you use a different device then better repeat the search yourself in the IDF.

So you have an address where to look at: 0x60043024 and you can read the value there with

from machine import mem32
first = mem32[0x60043024]

then perhaps use delay_ms(10) from the time module and so on.

[kjm1102]

Am I likely to find this memory location for something like the S2 or does it only exist in USB aware variants like the C3?

[kjm1102]

Maybe I should stick with the gpio jumper.

[rkompass]

Am I likely to find this memory location for something like the S2

USB_SERIAL_JTAG_FRAM_NUM_REG occurs in include files for the C3, C6, H2, P4 and S3 variants.

[karfas]

See the S2 technical reference.
There they describe registers and addresses für the USB OTG interface.