| 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> |
| 8 | * -b <baudrate> (divides by 16 if bitbang as taken from the ftdi datasheets) |
| 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; |
| 175 | printf("and took %.4f seconds, this is factor %.2f\n",duration,plan/duration); |
| 176 | |
| 177 | ftdi_usb_close(&ftdic); |
| 178 | ftdi_deinit(&ftdic); |
| 179 | exit (0); |
| 180 | } |