61 lines
1.8 KiB
Bash
Executable File
61 lines
1.8 KiB
Bash
Executable File
#!/bin/bash
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# A script to automatically find and reset the FTDI USB-to-Serial converter
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# commonly used on SiFive development boards like the P550. This is useful
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# when a tool like OpenOCD takes exclusive control and doesn't release the
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# ttyUSB devices correctly.
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set -e
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# --- Configuration ---
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# The Vendor and Product ID for the FTDI FT4232H Quad-HS USB-UART/FIFO IC.
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# You can verify this for your board by running `lsusb`.
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VENDOR_ID="0403"
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PRODUCT_ID="6011"
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# --- Sanity Checks ---
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if [ "$(id -u)" -ne 0 ]; then
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echo "This script must be run as root. Please use 'sudo'." >&2
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exit 1
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fi
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if ! [ -d /sys/bus/usb/drivers/usb ]; then
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echo "Error: USB drivers not found at /sys/bus/usb/drivers/usb." >&2
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exit 1
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fi
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# --- Main Logic ---
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echo "Searching for USB device with ID ${VENDOR_ID}:${PRODUCT_ID}..."
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FOUND_BUS_ID=""
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for dir in /sys/bus/usb/devices/*; do
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if [ -f "${dir}/idVendor" ] && [ -f "${dir}/idProduct" ]; then
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if [ "$(cat "${dir}/idVendor")" == "${VENDOR_ID}" ] && [ "$(cat "${dir}/idProduct")" == "${PRODUCT_ID}" ]; then
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FOUND_BUS_ID=$(basename "${dir}")
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echo "Found SiFive board on USB bus ID: ${FOUND_BUS_ID}"
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break
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fi
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fi
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done
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if [ -z "${FOUND_BUS_ID}" ]; then
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echo "Error: Could not find a connected SiFive board (FTDI ${VENDOR_ID}:${PRODUCT_ID})." >&2
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echo "Please ensure the board is connected." >&2
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exit 1
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fi
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echo "Resetting USB device..."
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# Unbind the device from the kernel
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echo " - Unbinding driver from ${FOUND_BUS_ID}..."
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echo -n "${FOUND_BUS_ID}" > /sys/bus/usb/drivers/usb/unbind
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# Give it a moment to process
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sleep 1
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# Bind the device, prompting the kernel to re-attach the driver
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echo " - Binding driver to ${FOUND_BUS_ID}..."
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echo -n "${FOUND_BUS_ID}" > /sys/bus/usb/drivers/usb/bind
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echo "Done. The /dev/ttyUSB* devices should reappear shortly."
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