| 1 | /* LIBFTDI EEPROM access example |
| 2 | |
| 3 | This program is distributed under the GPL, version 2 |
| 4 | */ |
| 5 | |
| 6 | #include <stdio.h> |
| 7 | #include <stdlib.h> |
| 8 | #include <string.h> |
| 9 | #include <ctype.h> |
| 10 | #include <unistd.h> |
| 11 | #include <getopt.h> |
| 12 | #include <ftdi.h> |
| 13 | |
| 14 | int main(int argc, char **argv) |
| 15 | { |
| 16 | struct ftdi_context *ftdi; |
| 17 | int do_read = 0; |
| 18 | int do_write = 0; |
| 19 | int i, f, retval; |
| 20 | |
| 21 | if ((ftdi = ftdi_new()) == 0) |
| 22 | { |
| 23 | fprintf(stderr, "Failed to allocate ftdi structure :%s \n", |
| 24 | ftdi_get_error_string(ftdi)); |
| 25 | return EXIT_FAILURE; |
| 26 | } |
| 27 | |
| 28 | while ((i = getopt(argc, argv, "brw")) != -1) |
| 29 | { |
| 30 | switch (i) |
| 31 | { |
| 32 | case 'b': |
| 33 | do_read = 1; |
| 34 | do_write = 1; |
| 35 | break; |
| 36 | case 'r': |
| 37 | do_read = 1; |
| 38 | break; |
| 39 | case 'w': |
| 40 | do_write = 1; |
| 41 | break; |
| 42 | default: |
| 43 | fprintf(stderr, "usage: %s [options]\n", *argv); |
| 44 | fprintf(stderr, "\t-b do synchronous read and write\n"); |
| 45 | fprintf(stderr, "\t-r do synchronous read\n"); |
| 46 | fprintf(stderr, "\t-w do synchronous write\n"); |
| 47 | retval = -1; |
| 48 | goto done; |
| 49 | } |
| 50 | } |
| 51 | |
| 52 | // Select first interface |
| 53 | ftdi_set_interface(ftdi, INTERFACE_ANY); |
| 54 | |
| 55 | struct ftdi_device_list *devlist; |
| 56 | int res; |
| 57 | if ((res = ftdi_usb_find_all(ftdi, &devlist, 0, 0)) < 0) |
| 58 | { |
| 59 | fprintf(stderr, "No FTDI with default VID/PID found\n"); |
| 60 | retval = EXIT_FAILURE; |
| 61 | goto do_deinit; |
| 62 | } |
| 63 | if (res > 0) |
| 64 | { |
| 65 | int i = 1; |
| 66 | f = ftdi_usb_open_dev(ftdi, devlist[0].dev); |
| 67 | if (f < 0) |
| 68 | { |
| 69 | fprintf(stderr, "Unable to open device %d: (%s)", |
| 70 | i, ftdi_get_error_string(ftdi)); |
| 71 | retval = -1; |
| 72 | goto do_deinit; |
| 73 | } |
| 74 | } |
| 75 | else |
| 76 | { |
| 77 | fprintf(stderr, "No devices found\n"); |
| 78 | retval = -1; |
| 79 | goto do_deinit; |
| 80 | } |
| 81 | ftdi_list_free(&devlist); |
| 82 | int err = ftdi_usb_purge_buffers(ftdi); |
| 83 | if (err != 0) { |
| 84 | fprintf(stderr, "ftdi_usb_purge_buffer: %d: %s\n", |
| 85 | err, ftdi_get_error_string(ftdi)); |
| 86 | retval = -1; |
| 87 | goto do_deinit; |
| 88 | } |
| 89 | /* Reset MPSSE controller. */ |
| 90 | err = ftdi_set_bitmode(ftdi, 0, BITMODE_RESET); |
| 91 | if (err != 0) { |
| 92 | fprintf(stderr, "ftdi_set_bitmode: %d: %s\n", |
| 93 | err, ftdi_get_error_string(ftdi)); |
| 94 | retval = -1; |
| 95 | goto do_deinit; |
| 96 | } |
| 97 | /* Enable MPSSE controller. Pin directions are set later.*/ |
| 98 | err = ftdi_set_bitmode(ftdi, 0, BITMODE_MPSSE); |
| 99 | if (err != 0) { |
| 100 | fprintf(stderr, "ftdi_set_bitmode: %d: %s\n", |
| 101 | err, ftdi_get_error_string(ftdi)); |
| 102 | return -1; |
| 103 | } |
| 104 | uint8_t ftdi_init[15] = {TCK_DIVISOR, 0x00, 0x00, |
| 105 | SET_BITS_HIGH, 0, 0xff, |
| 106 | GET_BITS_HIGH, |
| 107 | SET_BITS_HIGH, 0x55, 0xff, |
| 108 | GET_BITS_HIGH, |
| 109 | SET_BITS_HIGH, 0xaa, 0xff, |
| 110 | GET_BITS_HIGH}; |
| 111 | struct ftdi_transfer_control *tc_read; |
| 112 | struct ftdi_transfer_control *tc_write; |
| 113 | uint8_t data[3]; |
| 114 | if (do_read) { |
| 115 | tc_read = ftdi_read_data_submit(ftdi, data, 3); |
| 116 | } |
| 117 | if (do_write) { |
| 118 | tc_write = ftdi_write_data_submit(ftdi, ftdi_init, 15); |
| 119 | int transfer = ftdi_transfer_data_done(tc_write); |
| 120 | printf("Async write %d\n", transfer); |
| 121 | } else { |
| 122 | int written = ftdi_write_data(ftdi, ftdi_init, 15); |
| 123 | if (written != 15) { |
| 124 | printf("Sync write failed\n"); |
| 125 | } |
| 126 | } |
| 127 | if (do_read) { |
| 128 | int transfer = ftdi_transfer_data_done(tc_read); |
| 129 | printf("Async Read %d\n", transfer); |
| 130 | } else { |
| 131 | int index = 0; |
| 132 | while (index < 3) { |
| 133 | int res = ftdi_read_data(ftdi, data + index, 3 - index); |
| 134 | if (res < 0) { |
| 135 | printf("Async read failure at %d\n", index); |
| 136 | } else { |
| 137 | index += res; |
| 138 | } |
| 139 | } |
| 140 | } |
| 141 | printf("Read %02x %02x %02x\n", data[0], data[1], data[2]); |
| 142 | done: |
| 143 | ftdi_usb_close(ftdi); |
| 144 | do_deinit: |
| 145 | ftdi_free(ftdi); |
| 146 | return retval; |
| 147 | } |