I am new to the Mbed platform. I am using a common NPX development board based on the LCP1768 chip.
I am trying to connect a USB device to the Mbed (it’s an USB to RS232 converter. Note that i want to connect the USB side to the Mbed and want it to send informations. I don’t want to use the dedicated Tx and Rx pin, i need to use the USB connection).
However, the device doesn’t seem to turn on when plugged to the Mbed. It just flashes once and stays off, doesn’t seem to recognize the Mbed as something it would communicate with.
I tried connecting the four USB pins to GND, +5V, and then IF- and IF+ pins (which are the standard pins used by the mini-usb connecter for programming the board), and also tried the D- and D+ pins (pins 31 and 32 on the board).
As i want to send Serial data, I tried using BufferedSerial (USBRX, USBTX, Baudrate). The way I implemented it works fine over a standard USB cable connected to the computer. However, the same code just doesn’t work with the USB to RS232 converter.
I also tried using USBSerial, and other USB Api’s.
I tried to set the blocking parameter to false.
It just doesn’t want to communicate with the Mbed.
Maybe i am missing something obvious ?
Thanks for you help !