Hi all,
I'm new here so please bear with me if I'm breaking any posting rules.
I ran into some problems running an FTDI application on a MIPS platform.
I have an embedded device using an Atmel microcontroller. The uC is
programmed over SPI via an FTDI chip, using bit-banging.
I have an application that does the programming and it works well on my
Linux machine (Kernel 3.2.0-0.bpo.4-686-pae, libftdi 1-1.0, libusb-1.0.16).
I cross-compiled the application (and the libftdi, confuse and libusb
libraries) for a MIPS CPU, Atheros AR9330 (it's the TPLink MR3020
router, running OpenWrt). Used the same libraries and the kernel is 3.3.8.
While the application runs fine (so it cross compiled well), it seems
unable to communicate properly with the board. I send data and either
get all zeroes or all FFs. I enabled usb debugging but the output is
identical between the two machines - the only difference being in the
usbi_handle_transfer_completion, with different addresses, but I guess
that's normal.
I tried to lower the baudrate to 9600 but it still didn't work.
I did some analysis on the scope of the SPI clock and there is a
difference between the Linux machine and the router.
Did anyone run into this kind of problem before? Is there any type of
debugging that I could perform to help identify the issue?
Thanks and regards,
Victor
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