Commit | Line | Data |
---|---|---|
91dbb659 | 1 | /* Libftdi example for asynchronous read/write. |
26fc55b0 UB |
2 | |
3 | This program is distributed under the GPL, version 2 | |
4 | */ | |
5 | ||
91dbb659 UB |
6 | /* This programm switches to MPSSE mode, and sets and then reads back |
7 | * the high byte 3 times with three different values. | |
8 | * The expected read values are hard coded in ftdi_init | |
9 | * with 0x00, 0x55 and 0xaa | |
10 | * | |
11 | * Make sure that that nothing else drives some bit of the high byte | |
12 | * or expect a collision for a very short time and some differences | |
13 | * in the data read back. | |
14 | * | |
15 | * Result should be the same without any option or with either | |
16 | * -r or -w or -b. | |
17 | */ | |
18 | ||
19 | ||
26fc55b0 UB |
20 | #include <stdio.h> |
21 | #include <stdlib.h> | |
22 | #include <string.h> | |
23 | #include <ctype.h> | |
24 | #include <unistd.h> | |
25 | #include <getopt.h> | |
26 | #include <ftdi.h> | |
27 | ||
28 | int main(int argc, char **argv) | |
29 | { | |
30 | struct ftdi_context *ftdi; | |
31 | int do_read = 0; | |
32 | int do_write = 0; | |
33 | int i, f, retval; | |
34 | ||
35 | if ((ftdi = ftdi_new()) == 0) | |
36 | { | |
37 | fprintf(stderr, "Failed to allocate ftdi structure :%s \n", | |
38 | ftdi_get_error_string(ftdi)); | |
39 | return EXIT_FAILURE; | |
40 | } | |
41 | ||
42 | while ((i = getopt(argc, argv, "brw")) != -1) | |
43 | { | |
44 | switch (i) | |
45 | { | |
46 | case 'b': | |
47 | do_read = 1; | |
48 | do_write = 1; | |
49 | break; | |
50 | case 'r': | |
51 | do_read = 1; | |
52 | break; | |
53 | case 'w': | |
54 | do_write = 1; | |
55 | break; | |
56 | default: | |
57 | fprintf(stderr, "usage: %s [options]\n", *argv); | |
58 | fprintf(stderr, "\t-b do synchronous read and write\n"); | |
59 | fprintf(stderr, "\t-r do synchronous read\n"); | |
60 | fprintf(stderr, "\t-w do synchronous write\n"); | |
61 | retval = -1; | |
62 | goto done; | |
63 | } | |
64 | } | |
65 | ||
91dbb659 | 66 | /* Select first free interface */ |
26fc55b0 UB |
67 | ftdi_set_interface(ftdi, INTERFACE_ANY); |
68 | ||
69 | struct ftdi_device_list *devlist; | |
70 | int res; | |
71 | if ((res = ftdi_usb_find_all(ftdi, &devlist, 0, 0)) < 0) | |
72 | { | |
73 | fprintf(stderr, "No FTDI with default VID/PID found\n"); | |
74 | retval = EXIT_FAILURE; | |
75 | goto do_deinit; | |
76 | } | |
77 | if (res > 0) | |
78 | { | |
79 | int i = 1; | |
80 | f = ftdi_usb_open_dev(ftdi, devlist[0].dev); | |
81 | if (f < 0) | |
82 | { | |
83 | fprintf(stderr, "Unable to open device %d: (%s)", | |
84 | i, ftdi_get_error_string(ftdi)); | |
85 | retval = -1; | |
86 | goto do_deinit; | |
87 | } | |
88 | } | |
89 | else | |
90 | { | |
91 | fprintf(stderr, "No devices found\n"); | |
92 | retval = -1; | |
93 | goto do_deinit; | |
94 | } | |
95 | ftdi_list_free(&devlist); | |
ed46f09c | 96 | int err = ftdi_tcioflush(ftdi); |
26fc55b0 | 97 | if (err != 0) { |
ed46f09c | 98 | fprintf(stderr, "ftdi_tcioflush: %d: %s\n", |
26fc55b0 UB |
99 | err, ftdi_get_error_string(ftdi)); |
100 | retval = -1; | |
101 | goto do_deinit; | |
102 | } | |
103 | /* Reset MPSSE controller. */ | |
104 | err = ftdi_set_bitmode(ftdi, 0, BITMODE_RESET); | |
105 | if (err != 0) { | |
106 | fprintf(stderr, "ftdi_set_bitmode: %d: %s\n", | |
107 | err, ftdi_get_error_string(ftdi)); | |
108 | retval = -1; | |
109 | goto do_deinit; | |
110 | } | |
111 | /* Enable MPSSE controller. Pin directions are set later.*/ | |
112 | err = ftdi_set_bitmode(ftdi, 0, BITMODE_MPSSE); | |
113 | if (err != 0) { | |
114 | fprintf(stderr, "ftdi_set_bitmode: %d: %s\n", | |
115 | err, ftdi_get_error_string(ftdi)); | |
116 | return -1; | |
117 | } | |
91dbb659 UB |
118 | #define DATA_TO_READ 3 |
119 | uint8_t ftdi_init[] = {TCK_DIVISOR, 0x00, 0x00, | |
120 | /* Set High byte to zero.*/ | |
26fc55b0 UB |
121 | SET_BITS_HIGH, 0, 0xff, |
122 | GET_BITS_HIGH, | |
91dbb659 | 123 | /* Set High byte to 0x55.*/ |
26fc55b0 UB |
124 | SET_BITS_HIGH, 0x55, 0xff, |
125 | GET_BITS_HIGH, | |
91dbb659 | 126 | /* Set High byte to 0xaa.*/ |
26fc55b0 | 127 | SET_BITS_HIGH, 0xaa, 0xff, |
91dbb659 UB |
128 | GET_BITS_HIGH, |
129 | /* Set back to high impedance.*/ | |
130 | SET_BITS_HIGH, 0x00, 0x00 }; | |
26fc55b0 UB |
131 | struct ftdi_transfer_control *tc_read; |
132 | struct ftdi_transfer_control *tc_write; | |
133 | uint8_t data[3]; | |
134 | if (do_read) { | |
91dbb659 | 135 | tc_read = ftdi_read_data_submit(ftdi, data, DATA_TO_READ); |
26fc55b0 UB |
136 | } |
137 | if (do_write) { | |
91dbb659 | 138 | tc_write = ftdi_write_data_submit(ftdi, ftdi_init, sizeof(ftdi_init)); |
26fc55b0 | 139 | int transfer = ftdi_transfer_data_done(tc_write); |
91dbb659 UB |
140 | if (transfer != sizeof(ftdi_init)) { |
141 | printf("Async write failed : %d\n", transfer); | |
142 | } | |
26fc55b0 | 143 | } else { |
91dbb659 UB |
144 | int written = ftdi_write_data(ftdi, ftdi_init, sizeof(ftdi_init)); |
145 | if (written != sizeof(ftdi_init)) { | |
146 | printf("Sync write failed: %d\n", written); | |
26fc55b0 UB |
147 | } |
148 | } | |
149 | if (do_read) { | |
150 | int transfer = ftdi_transfer_data_done(tc_read); | |
91dbb659 UB |
151 | if (transfer != DATA_TO_READ) { |
152 | printf("Async Read failed:%d\n", transfer); | |
153 | } | |
26fc55b0 UB |
154 | } else { |
155 | int index = 0; | |
91dbb659 UB |
156 | ftdi->usb_read_timeout = 1; |
157 | int i = 1000; /* Fail if read did not succeed in 1 second.*/ | |
158 | while (i--) { | |
26fc55b0 UB |
159 | int res = ftdi_read_data(ftdi, data + index, 3 - index); |
160 | if (res < 0) { | |
161 | printf("Async read failure at %d\n", index); | |
162 | } else { | |
163 | index += res; | |
164 | } | |
91dbb659 UB |
165 | if (res == 3) { |
166 | break; | |
167 | } | |
168 | } | |
169 | if (i < 1) { | |
170 | printf("Async read unsuccessfull\n"); | |
26fc55b0 UB |
171 | } |
172 | } | |
173 | printf("Read %02x %02x %02x\n", data[0], data[1], data[2]); | |
174 | done: | |
175 | ftdi_usb_close(ftdi); | |
176 | do_deinit: | |
177 | ftdi_free(ftdi); | |
178 | return retval; | |
179 | } |