docs(usb_host): Update usb_host example READMEs for P4

Closes https://github.com/espressif/esp-idf/issues/14578
Closes https://github.com/espressif/esp-idf/issues/12142

examples/peripherals/usb/README.md

@@ -1,10 +1,10 @@
 # USB-OTG Examples
 
-See the [README.md](../README.md) file in the upper level [examples](../) directory for more information about examples.
+See the [README.md](../../README.md) file in the upper level [examples](../../) directory for more information about examples.
 
 ## Common Pin Assignments
 
-Pin assignment is only needed for ESP chips that have an USB-OTG peripheral.
+Pin assignment is only needed for ESP chips that have a USB-OTG peripheral.
 If your board doesn't have a USB connector connected to the USB-OTG dedicated GPIOs, you may have to DIY a cable and connect **D+** and **D-** to the pins listed below.
 
 ```
@@ -21,3 +21,6 @@ Refer to `soc/usb_pins.h` to find the real GPIO number of **USBPHY_DP_NUM** and
 |             | USB_DP | USB_DM |
 | ----------- | ------ | ------ |
 | ESP32-S2/S3 | GPIO20 | GPIO19 |
+| ESP32-P4    | pin 51 | pin 50 |
+
+> Note: On the ESP32-P4, the USB 2.0 PHY pins are dedicated to USB-OTG functionality and cannot be used as general-purpose GPIOs.

examples/peripherals/usb/host/cdc/cdc_acm_host/README.md

@@ -11,12 +11,11 @@ This example shows how to use the CDC-ACM Host Driver to allow an ESP chip to co
 
 ### Hardware Required
 
-Two ESP boards that have USB-OTG supported. One will act as USB host and the other as USB device.  
+Two development boards with USB-OTG support. One will act as USB host and the other as USB device.  
-Connect USB_D+, USB_D-, GND and +5V signals of USB host to USB device.
 
 #### Pin Assignment
 
-See common pin assignments for USB Device examples from [upper level](../../../README.md#common-pin-assignments).
+Follow instruction in [examples/usb/README.md](../../../README.md) for specific hardware setup.
 
 ### Build and Flash
 

examples/peripherals/usb/host/cdc/cdc_acm_vcp/README.md

@@ -5,28 +5,26 @@
 
 (See the README.md file in the upper level 'examples' directory for more information about examples.)
 
-This example shows how to extend CDC-ACM driver for Virtual Communication Port (VCP) devices,
+This example shows how to extend CDC-ACM driver for Virtual Communication Port (VCP) devices, such as CP210x, FTDI FT23x or CH34x devices.
-such as CP210x, FTDI FT23x or CH34x devices.
 
 The drivers are fetched from [ESP Component Registry](https://components.espressif.com/) together with VCP service that automatically loads correct driver for plugged-in device.
 
 ## How to use example
 
-1. Connect your USB<->UART converter to ESP32-S2/S3, the device will be automatically enumerated and correct driver will be loaded
+1. Connect your USB<->UART converter to ESP board, the device will be automatically enumerated and correct driver will be loaded
 2. Change baudrate and other line coding parameters in [cdc_acm_vcp_example_main.cpp](main/cdc_acm_vcp_example_main.cpp) to match your needs
 3. Now you can use the usual CDC-ACM API to control the device and send data. Data are received in `handle_rx` callback
 4. Try disconnecting and then reconnecting of the USB device to experiment with USB hotplugging
 
 ### Hardware Required
 
-* ESP board with USB-OTG supported
+* Development board with USB-OTG support
+* A USB cable for Power supply and programming
 * Silicon Labs CP210x, FTDI FT23x or CP34x USB to UART converter
 
-Connect USB_D+, USB_D-, GND and +5V signals of your ESP chip to matching signals on USB to UART converter.
-
 #### Pin Assignment
 
-See common pin assignments for USB Device examples from [upper level](../../../README.md#common-pin-assignments).
+Follow instruction in [examples/usb/README.md](../../../README.md) for specific hardware setup.
 
 ### Build and Flash
 

examples/peripherals/usb/host/hid/README.md

@@ -6,24 +6,13 @@ This example implements a basic USB Host HID Class Driver, and demonstrates how
 
 
 ### Hardware Required
-* Development board with USB capable ESP SoC (ESP32-S2/ESP32-S3)
+* Development board with USB-OTG support
 * A USB cable for Power supply and programming
 * USB OTG Cable
 
 ### Common Pin Assignments
 
-If your board doesn't have a USB A connector connected to the dedicated GPIOs, 
+Follow instructions in [examples/usb/README.md](../../README.md) for specific hardware setup.
-you may have to DIY a cable and connect **D+** and **D-** to the pins listed below.
-
-```
-ESP BOARD    USB CONNECTOR (type A)
-                   --
-                  | || VCC
-[GPIO19]  ------> | || D-
-[GPIO20]  ------> | || D+
-                  | || GND
-                   --
-```
 
 ### Build and Flash
 

examples/peripherals/usb/host/msc/README.md

@@ -12,6 +12,7 @@ This example demonstrates usage of the MSC (Mass Storage Class) to access storag
 3. Create `ESP` subdirectory (if not present already), as well as a `text.txt` file
 4. Run read/write benchmarks by transferring 1 MB of data to a `dummy` file
 
+> Note: This example currently supports only FAT-formatted drives. Other file systems, such as exFAT or NTFS, are not compatible with this example. Please ensure that your USB drive is formatted as FAT to avoid compatibility issues.
 
 ### USB Reconnections
 
@@ -20,24 +21,13 @@ The example is run in a loop so that it can demonstrate USB connection and recon
 
 ### Hardware Required
 
-* Development board with USB capable ESP SoC (ESP32-S2/ESP32-S3)
+* Development board with USB-OTG support
 * A USB cable for Power supply and programming
 * A USB flash drive
 
 ### Common Pin Assignments
 
-If your board doesn't have a USB A connector connected to the dedicated GPIOs, 
+Follow instructions in [examples/usb/README.md](../../README.md) for specific hardware setup.
-you may have to DIY a cable and connect **D+** and **D-** to the pins listed below.
-
-```
-ESP BOARD    USB CONNECTOR (type A)
-                   --
-                  | || VCC
-[GPIO19]  ------> | || D-
-[GPIO20]  ------> | || D+
-                  | || GND
-                   --
-```
 
 Additionally, GPIO0 can be shorted to ground in order to deinitialize USB stack. 
 

examples/peripherals/usb/host/usb_host_lib/README.md

@@ -32,11 +32,8 @@ The example demonstrates the following aspects of the USB Host Library API:
 
 ### Hardware Required
 
-An ESP board that has a push button and supports USB-OTG. The example uses the ESP's internal USB PHY, however the internal USB PHY's pins will need to be connected to a USB port (i.e., a USB breakout board) as follows:
+* Development board with USB-OTG support.
-
+* Follow instruction in [examples/usb/README.md](../../README.md) for specific hardware setup.
-- GND and 5V signals of the ESP board to the GND and 5V lines of the USB port
-- GPIO 19 to D-
-- GPIO 20 to D+
 
 ### Configure the project
 

examples/peripherals/usb/host/uvc/README.md

@@ -22,12 +22,14 @@ Optionally, the captured video can be visualized on a PC with help of the `playe
 
 ### Hardware Required
 
-* ESP with USB peripheral and external PSRAM
+* Development board with USB-OTG support and external PSRAM
 * Exposed USB host connector
 * USB camera
 
 Running this example on an **ESP module without external PSRAM will fail on initialization**. Please select your PSRAM configuration in menuconfig `Component config->ESP PSRAM`. If you manually disable PSRAM, the required framebuffers might not fit into DRAM (especially on ESP32-S2).
 
+Follow instructions in [examples/usb/README.md](../../README.md) for specific hardware setup.
+
 ### Configure the project
 
 Following configuration is needed for streaming video: