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53

answers:

1

It's a FT2232D chip, and the LED is connected to BDBUS6.

The library is less documented than I might like (better than FTDI's own library though, which doesn't even work on modern kernels), the only example code I can find that does this uses a deprecated function (I tried, it doesn't seem to work), and I'm absolutely stumped.

The harder I try with this thing, the more difficult it seems. I'm not looking for someone to do my homework for me so much as I just need a nudge in the right direction. Any help appreciated (even speculative).

Update: I've been trying this, though ftdi_enable_bitbang() is deprecated. The following code compiles, it runs without barfing, but no blinkenlighten. Schematics of the device in question are available at http://www.semtech.com/images/datasheet/sx1211ska_v1_std.pdf , page 23. BDBUS6 and BDBUS7 are hooked up to the LEDs.

#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include <ftdi.h>

#define FTDI_VID                0x0403
#define FTDI_PID                0x6010


static struct ftdi_context ftdic_context;

int main(void) {
        int ret;
        unsigned int i;
        unsigned char c = 0;

        // Initialize bitbang.
//      ret = ft2232_bb_init();

        ftdi_usb_open(&ftdic_context, FTDI_VID, FTDI_PID);
        ftdi_set_interface(&ftdic_context, INTERFACE_B);
        ftdi_enable_bitbang(&ftdic_context, 0xb0);

        // Trying to blink some lights.
        printf("\nNow let's try to blinkenlights...\n");
        for (i = 0; i < 20; i++) {
                c ^= 0x80;
                ftdi_write_data(&ftdic_context, &c, 1);
                sleep(1);
        }

        return EXIT_SUCCESS;
}
+1  A: 

Same Answer as here: http://stackoverflow.com/questions/3527464/im-having-trouble-finding-example-code-for-libftdis-mpsse-spi-mode/3535928#3535928

http://flashrom.org/Downloads

Its mainly MPSSE mode, but it also sets the nCS signal via bitbang command.

Turbo J
If you have some more insight into where/how it's doing this, I'd appreciate hearing about it. I'm just not seeing that in the current version.
John O