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e0aca3fa GE |
1 | /* baud_test.c |
2 | * | |
3 | * test setting the baudrate and compare it with the expected runtime | |
4 | * | |
5 | * options: | |
6 | * -p <usb-product-id> (vendor is fixed to ftdi / 0x0403) | |
7 | * -d <datasize to send in bytes> | |
97834102 | 8 | * -b <baudrate> (divides by 16 if bitbang as taken from the ftdi datasheets) |
e0aca3fa GE |
9 | * -m <mode to use> r: serial a: async bitbang s:sync bitbang |
10 | * | |
11 | * (C) 2009 by Gerd v. Egidy <gerd.von.egidy@intra2net.com> | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or modify | |
14 | * it under the terms of the GNU General Public License as published by | |
15 | * the Free Software Foundation; either version 2 of the License, or | |
16 | * (at your option) any later version. | |
17 | ||
18 | * This program is distributed in the hope that it will be useful, | |
19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21 | * GNU General Public License for more details. | |
22 | * | |
23 | */ | |
24 | ||
25 | #include <sys/time.h> | |
26 | #include <stdio.h> | |
27 | #include <unistd.h> | |
28 | #include <ftdi.h> | |
29 | ||
30 | double get_prec_time() | |
31 | { | |
32 | struct timeval tv; | |
33 | double res; | |
34 | ||
35 | gettimeofday(&tv,NULL); | |
36 | ||
37 | res=tv.tv_sec; | |
38 | res+=((double)tv.tv_usec/1000000); | |
39 | ||
40 | return res; | |
41 | } | |
42 | ||
43 | int main(int argc, char **argv) | |
44 | { | |
45 | struct ftdi_context ftdic; | |
46 | int i, t; | |
47 | char txbuf[256]; | |
48 | char rxbuf[4096]; | |
49 | double start, duration, plan; | |
50 | ||
51 | // default values | |
52 | int baud=9600; | |
53 | int set_baud; | |
54 | int datasize=100000; | |
55 | int product_id=0x6001; | |
56 | enum ftdi_mpsse_mode test_mode=BITMODE_BITBANG; | |
57 | ||
58 | while ((t = getopt (argc, argv, "b:d:p:m:")) != -1) | |
59 | { | |
60 | switch (t) | |
61 | { | |
62 | case 'd': | |
63 | datasize = atoi (optarg); | |
64 | break; | |
65 | case 'm': | |
66 | switch(*optarg) | |
67 | { | |
68 | case 'r': | |
69 | // serial | |
70 | test_mode=BITMODE_RESET; | |
71 | break; | |
72 | case 'a': | |
73 | // async | |
74 | test_mode=BITMODE_BITBANG; | |
75 | break; | |
76 | case 's': | |
77 | // sync | |
78 | test_mode=BITMODE_SYNCBB; | |
79 | break; | |
80 | } | |
81 | break; | |
82 | case 'b': | |
83 | baud = atoi (optarg); | |
84 | break; | |
85 | case 'p': | |
86 | sscanf(optarg,"0x%x",&product_id); | |
87 | break; | |
88 | } | |
89 | } | |
90 | ||
91 | if (ftdi_init(&ftdic) < 0) | |
92 | { | |
93 | fprintf(stderr, "ftdi_init failed\n"); | |
94 | return EXIT_FAILURE; | |
95 | } | |
96 | ||
97 | if (ftdi_usb_open(&ftdic, 0x0403, product_id) < 0) | |
98 | { | |
99 | fprintf(stderr,"Can't open ftdi device: %s\n",ftdi_get_error_string(&ftdic)); | |
100 | return EXIT_FAILURE; | |
101 | } | |
102 | ||
103 | set_baud=baud; | |
104 | if (test_mode!=BITMODE_RESET) | |
105 | { | |
106 | // we do bitbang, so real baudrate / 16 | |
107 | set_baud=baud/16; | |
108 | } | |
109 | ||
110 | ftdi_set_baudrate(&ftdic,set_baud); | |
111 | printf("real baudrate used: %d\n",(test_mode==BITMODE_RESET) ? ftdic.baudrate : ftdic.baudrate*16); | |
112 | ||
113 | if (ftdi_set_bitmode(&ftdic, 0xFF,test_mode) < 0) | |
114 | { | |
115 | fprintf(stderr,"Can't set mode: %s\n",ftdi_get_error_string(&ftdic)); | |
116 | return EXIT_FAILURE; | |
117 | } | |
118 | ||
119 | if (test_mode==BITMODE_RESET) | |
120 | { | |
121 | // serial 8N1: 8 data bits, 1 startbit, 1 stopbit | |
122 | plan=((double)(datasize*10))/baud; | |
123 | } | |
124 | else | |
125 | { | |
126 | // bitbang means 8 bits at once | |
127 | plan=((double)datasize)/baud; | |
128 | } | |
129 | ||
130 | printf("this test should take %.2f seconds\n",plan); | |
131 | ||
132 | // prepare data to send: 0 and 1 bits alternating (except for serial start/stopbit): | |
133 | // maybe someone wants to look at this with a scope or logic analyzer | |
134 | for (i=0; i<sizeof(txbuf); i++) | |
135 | { | |
136 | if (test_mode==BITMODE_RESET) | |
137 | txbuf[i]=0xAA; | |
138 | else | |
139 | txbuf[i]=(i%2) ? 0xff : 0; | |
140 | } | |
141 | ||
142 | if(test_mode==BITMODE_SYNCBB) | |
143 | { | |
144 | // clear the receive buffer before beginning | |
145 | // will read only as much as available | |
146 | ftdi_read_data(&ftdic, rxbuf, sizeof(rxbuf)); | |
147 | } | |
148 | ||
149 | start=get_prec_time(); | |
150 | ||
151 | i=0; | |
152 | while(i < datasize) | |
153 | { | |
154 | int sendsize=sizeof(txbuf); | |
155 | if (i+sendsize > datasize) | |
156 | sendsize=datasize-i; | |
157 | ||
158 | if ((sendsize=ftdi_write_data(&ftdic, txbuf, sendsize)) < 0) | |
159 | { | |
160 | fprintf(stderr,"write failed at %d: %s\n", | |
161 | i, ftdi_get_error_string(&ftdic)); | |
162 | return EXIT_FAILURE; | |
163 | } | |
164 | ||
165 | i+=sendsize; | |
166 | ||
167 | if(test_mode==BITMODE_SYNCBB) | |
168 | { | |
169 | // read everything available | |
170 | ftdi_read_data(&ftdic, rxbuf, sizeof(rxbuf)); | |
171 | } | |
172 | } | |
173 | ||
174 | duration=get_prec_time()-start; | |
c74e7fbd | 175 | printf("and took %.4f seconds, this is factor %.3f\n",duration,plan/duration); |
e0aca3fa GE |
176 | |
177 | ftdi_usb_close(&ftdic); | |
178 | ftdi_deinit(&ftdic); | |
179 | exit (0); | |
180 | } |