3 Example to use CBUS bitbang mode of newer chipsets.
4 You must enable CBUS bitbang mode in the EEPROM first.
6 Thanks to Steve Brown <sbrown@ewol.com> for the
7 the information how to do it.
9 The top nibble controls input/output and the bottom nibble
10 controls the state of the lines set to output. The datasheet isn't clear
11 what happens if you set a bit in the output register when that line is
12 conditioned for input. This is described in more detail
13 in the FT232R bitbang app note.
19 | |------ Output Control 0->LO, 1->HI
20 |----------- Input/Output 0->Input, 1->Output
23 All pins to output with 0 bit high: 0xF1 (11110001)
24 Bits 0 and 1 to input, 2 and 3 to output and masked high: 0xCC (11001100)
26 The input is standard "0x" hex notation.
27 A carriage return terminates the program.
29 This program is distributed under the GPL, version 2
37 int main(int argc, char **argv)
39 struct ftdi_context ftdic;
42 unsigned char bitmask;
43 unsigned char input[10];
47 f = ftdi_usb_open(&ftdic, 0x0403, 0x6001);
48 if(f < 0 && f != -5) {
49 fprintf(stderr, "unable to open ftdi device: %d (%s)\n", f, ftdi_get_error_string(&ftdic));
52 printf("ftdi open succeeded: %d\n",f);
55 // Set bitmask from input
56 fgets(input, sizeof(input) - 1, stdin);
57 if (input[0] == '\n') break;
58 bitmask = strtol(input, NULL, 0);
59 printf("Using bitmask 0x%02x\n", bitmask);
60 f = ftdi_set_bitmode(&ftdic, bitmask, BITMODE_CBUS);
62 fprintf(stderr, "set_bitmode failed for 0x%x, error %d (%s)\n", bitmask, f, ftdi_get_error_string(&ftdic));
67 f = ftdi_read_pins(&ftdic, &buf[0]);
69 fprintf(stderr, "read_pins failed, error %d (%s)\n", f, ftdi_get_error_string(&ftdic));
72 printf("Read returned 0x%01x\n", buf[0] & 0x0f);
74 printf("disabling bitbang mode\n");
75 ftdi_disable_bitbang(&ftdic);
77 ftdi_usb_close(&ftdic);