Interfacing a USB Flash drive with rs232

[ninjarider]

usb flash drive over rs232

I need to interface a Microcontroller based board equipped with a rs232 to an USB Flash drive memory. Is it possible to use a rs232 to USB coverter to read/write flash memory? If yes, do you know how to write FAT files using commands from rs232?

Thank you in advance.

 

[petarpav]

rs232 to usb converter flash drive

You can use USB host to access usb flashdrive.

 

[ninjarider]

flash drive to rs232

Can you suggest me a suitable USB host?

Thank you for the attention

 

[eltonjohn]

rs232 to flash drive

Hi ninjarider ..
If you want to do simple project .You better don't go looking for a USB host .. those controllers are only avalaible in hi end cpus (32 bits at least)

If what you want to do is to be able to interface a USB drive in an embedded low cost solution.You'd be better off using a USB -> serial
or USB -> parallel solution . Like the ones that FTDI sells ..look for https://www.ftdichip.com/
an request information on how to connect a USB slave with one of their chips ...

 

[ninjarider]

Hi eltonjohn thank you for the answer. My problem is that the board is already done and I have only a serial port for the communications, so I'm looking for
a simple solution that allows to write data on a USB flash drive.

I looked at FTDI, cypress and ST web site and I found only a lot of windows drivers for their chip, but not much on microcontroller to a USB slave device.

 

[eltonjohn]

Is me again

Hi again ninjarider
Give the FTDI people a call i have used several times their parallel ->USB
adapter and it works well when interfaced to a PC . That is to say ,a USB host.. I don't know if their chip has the capability for arbitrating a USB slave .. I assume that not! .. But give them a call ..they might have something that you could use !

 

[petarpav]

USB solutions from FTDI is only slave and don't work with usb slave device, they work only with host usb.
You can use usb host controller from phillips - ISP116X(**broken link removed**), but you can't use RS232, usb host must be connected to microcontroller's system bus.

 

[vkchau]

TP561 of IC Plus Corp is a 56K Modem Chip USB.
-Full compliance with the USB Specification v1.1
-Support the RS232 Serial interface
-Support automatic handshake mode
-Over 1Mbps transfer rate
-Support remote wake-up and power management
-Dual data buffers for upstream and downstream data flow
-Support default ROM or external EEPROM for device
configuration
-On chip USB transceiver
-On chip crystal oscillator running at 12M Hz
-28 Pins SSOP package