add baud_test example program: compare expected and actual transfer speeds for differ...

diff --git a/examples/CMakeLists.txt b/examples/CMakeLists.txt
index 7be0978..2a8ee39 100644 (file)
--- a/examples/CMakeLists.txt
+++ b/examples/CMakeLists.txt
@@ -14,6 +14,7 @@ add_executable(bitbang_cbus bitbang_cbus.c)
 add_executable(bitbang_ft2232 bitbang_ft2232.c)
 add_executable(find_all find_all.c)
 add_executable(serial_read serial_read.c)
+add_executable(baud_test baud_test.c)
 
 # Linkage
 target_link_libraries(simple ftdi)
@@ -23,6 +24,7 @@ target_link_libraries(bitbang_cbus ftdi)
 target_link_libraries(bitbang_ft2232 ftdi)
 target_link_libraries(find_all ftdi)
 target_link_libraries(serial_read ftdi)
+target_link_libraries(baud_test ftdi)
 
 # libftdi++ examples
 if(FTDI_BUILD_CPP)

diff --git a/examples/Makefile.am b/examples/Makefile.am
index aef1328..820599a 100644 (file)
--- a/examples/Makefile.am
+++ b/examples/Makefile.am
@@ -17,6 +17,7 @@ bin_PROGRAMS = simple \
        bitbang_cbus \
        find_all \
        serial_read \
+       baud_test \
        $(examples_libftdipp)
 
 # Don't install the example files
@@ -29,6 +30,7 @@ bitbang_ft2232_SOURCES = bitbang_ft2232.c
 bitbang_cbus_SOURCES = bitbang_cbus.c
 find_all_SOURCES = find_all.c
 serial_read_SOURCES = serial_read.c
+baud_test_SOURCES = baud_test.c
 
 if HAVE_LIBFTDIPP
 find_all_pp_SOURCES = find_all_pp.cpp

diff --git a/examples/baud_test.c b/examples/baud_test.c
new file mode 100644 (file)
index 0000000..fd4959f
--- /dev/null
+++ b/examples/baud_test.c
@@ -0,0 +1,180 @@
+/* baud_test.c
+ *
+ * test setting the baudrate and compare it with the expected runtime
+ *
+ * options:
+ *  -p <usb-product-id> (vendor is fixed to ftdi / 0x0403)
+ *  -d <datasize to send in bytes>
+ *  -b <baudrate> (multiplies by 16 if bitbang as written in the ftdi datasheets)
+ *  -m <mode to use> r: serial a: async bitbang s:sync bitbang 
+ *
+ * (C) 2009 by Gerd v. Egidy <gerd.von.egidy@intra2net.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <sys/time.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <ftdi.h>
+
+double get_prec_time()
+{
+    struct timeval tv;
+    double res;
+    
+    gettimeofday(&tv,NULL);
+
+    res=tv.tv_sec;
+    res+=((double)tv.tv_usec/1000000);
+
+    return res;
+}
+
+int main(int argc, char **argv)
+{
+    struct ftdi_context ftdic;
+    int i, t;
+    char txbuf[256];
+    char rxbuf[4096];
+    double start, duration, plan;
+
+    // default values
+    int baud=9600;
+    int set_baud;
+    int datasize=100000;
+    int product_id=0x6001;
+    enum ftdi_mpsse_mode test_mode=BITMODE_BITBANG;
+    
+    while ((t = getopt (argc, argv, "b:d:p:m:")) != -1)
+    {
+        switch (t)
+        {
+            case 'd':
+                datasize = atoi (optarg);
+                break;
+            case 'm':
+                switch(*optarg)
+                {
+                    case 'r':
+                        // serial
+                        test_mode=BITMODE_RESET;
+                        break;
+                    case 'a':
+                        // async
+                        test_mode=BITMODE_BITBANG;
+                        break;
+                    case 's':
+                        // sync
+                        test_mode=BITMODE_SYNCBB;
+                        break;
+                }
+                break;
+            case 'b':
+                baud = atoi (optarg);
+                break;
+            case 'p':
+                sscanf(optarg,"0x%x",&product_id);
+                break;
+        }
+    }
+
+    if (ftdi_init(&ftdic) < 0)
+    {
+        fprintf(stderr, "ftdi_init failed\n");
+        return EXIT_FAILURE;
+    }
+
+    if (ftdi_usb_open(&ftdic, 0x0403, product_id) < 0)
+    {
+        fprintf(stderr,"Can't open ftdi device: %s\n",ftdi_get_error_string(&ftdic));
+        return EXIT_FAILURE;
+    }
+
+    set_baud=baud;
+    if (test_mode!=BITMODE_RESET)
+    {
+        // we do bitbang, so real baudrate / 16
+        set_baud=baud/16;
+    }
+
+    ftdi_set_baudrate(&ftdic,set_baud);
+    printf("real baudrate used: %d\n",(test_mode==BITMODE_RESET) ? ftdic.baudrate : ftdic.baudrate*16);
+
+    if (ftdi_set_bitmode(&ftdic, 0xFF,test_mode) < 0)
+    {
+        fprintf(stderr,"Can't set mode: %s\n",ftdi_get_error_string(&ftdic));
+        return EXIT_FAILURE;
+    }
+
+    if (test_mode==BITMODE_RESET)
+    {
+        // serial 8N1: 8 data bits, 1 startbit, 1 stopbit
+        plan=((double)(datasize*10))/baud;
+    }
+    else
+    {
+        // bitbang means 8 bits at once
+        plan=((double)datasize)/baud;
+    }
+
+    printf("this test should take %.2f seconds\n",plan);
+
+    // prepare data to send: 0 and 1 bits alternating (except for serial start/stopbit):
+    // maybe someone wants to look at this with a scope or logic analyzer
+    for (i=0; i<sizeof(txbuf); i++)
+    {
+        if (test_mode==BITMODE_RESET)
+            txbuf[i]=0xAA;
+        else
+            txbuf[i]=(i%2) ? 0xff : 0;
+    }
+
+    if(test_mode==BITMODE_SYNCBB)
+    {
+        // clear the receive buffer before beginning
+        // will read only as much as available
+        ftdi_read_data(&ftdic, rxbuf, sizeof(rxbuf));
+    }
+    
+    start=get_prec_time();
+
+    i=0;
+    while(i < datasize)
+    {
+        int sendsize=sizeof(txbuf);
+        if (i+sendsize > datasize)
+            sendsize=datasize-i;
+
+        if ((sendsize=ftdi_write_data(&ftdic, txbuf, sendsize)) < 0)
+        {
+            fprintf(stderr,"write failed at %d: %s\n",
+                    i, ftdi_get_error_string(&ftdic));
+            return EXIT_FAILURE;
+        }
+
+        i+=sendsize;
+
+        if(test_mode==BITMODE_SYNCBB)
+        {
+            // read everything available
+            ftdi_read_data(&ftdic, rxbuf, sizeof(rxbuf));
+        }
+    }
+
+    duration=get_prec_time()-start;
+    printf("and took %.4f seconds, this is factor %.2f\n",duration,plan/duration);
+
+    ftdi_usb_close(&ftdic);
+    ftdi_deinit(&ftdic);
+    exit (0);
+}