Currently I am trying to write some data to a FT232R USB device, this data is a
command that will turn a device on or off depending on the data sent.
When I simply write the message once, the device almost never turns on/off,
however if I send it at least twice the success rate is as far as I know 100%.
Another slight problem I'm having is the read part, this seems to instantly
return 0, even when put in a while loop it will never output, even though my
previous code using a simple read on /dev/ttyUSB0 did do this.
A short summary of my code:
struct ftdi_context ftdic;
ftdi_usb_open(&ftdic, 0x0403, 0x6001);
char data; //this is filled in my code but irrelevant to this summary as
far as I know
ftdi_write_data(&ftdic,(unsigned char *)bytes,33);
ftdi_read_data (&ftdic,buf,24 );
Some lines from lsusb -v -d 0403:6001 which may be important:
bEndpointAddress 0x81 EP 1 IN
bEndpointAddress 0x02 EP 2 OUT
So only 1 ftdi_write_data will work maybe 1 out of 10 times where calling the
ftdi_write_data function twice hasn't failed me yet...
Also about that read function it doesn't matter wether I make the size
parameter bigger, smaller or equal to what I am going to receive, it says it
never receives data. (I also checked the read timeout, it is set to 5000,
changing made no difference whatsoever)
Perhaps I'm forgetting just a simple set besides baudrate and line property,
thank you in advance for your response.
libftdi - see http://www.intra2net.com/en/developer/libftdi for details.
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