[PATCH 1/2] rtl_eeprom: Add -x to store exact xtal frequency in Hz.

[Andreas Seltenreich]

Stored in the last four bytes of the eeprom in network byte order.
---
 src/rtl_eeprom.c |   17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/src/rtl_eeprom.c b/src/rtl_eeprom.c
index 35191de..51024d6 100644
--- a/src/rtl_eeprom.c
+++ b/src/rtl_eeprom.c
@@ -23,8 +23,10 @@
 
 #ifndef _WIN32
 #include <unistd.h>
+#include <arpa/inet.h>
 #else
 #include <Windows.h>
+#include <WinSock2.h>
 #include "getopt/getopt.h"
 #endif
 
@@ -84,6 +86,7 @@ void usage(void)
                "\t[   terratec_plus\tTerratec T Stick+ (DVB-T/DAB)]\n"
                "\t[-w <filename> write dumped file to device]\n"
                "\t[-r <filename> dump EEPROM to file]\n"
+               "\t[-x <Hz> store calibrated XTAL frequency]\n"
                "\t[-h display this help text]\n"
                "\nUse on your own risk, especially -w!\n");
        exit(1);
@@ -262,9 +265,10 @@ int main(int argc, char **argv)
        int default_config = 0;
        int change = 0;
        int ir_endpoint = 0;
+       uint32_t xtal_freq = 0;
        char ch;
 
-       while ((opt = getopt(argc, argv, "d:m:p:s:i:g:w:r:h?")) != -1) {
+       while ((opt = getopt(argc, argv, "d:m:p:s:i:g:w:r:x:h?")) != -1) {
                switch (opt) {
                case 'd':
                        dev_index = atoi(optarg);
@@ -306,6 +310,9 @@ int main(int argc, char **argv)
                case 'r':
                        filename = optarg;
                        break;
+               case 'x':
+                       xtal_freq = htonl(atol(optarg));
+                       break;
                default:
                        usage();
                        break;
@@ -347,6 +354,14 @@ int main(int argc, char **argv)
        if (r < 0)
                return -1;
 
+       if(xtal_freq) {
+               r = rtlsdr_write_eeprom(dev, (void*)&xtal_freq, EEPROM_SIZE-4, 
4);
+               if (r < 0)
+                       fprintf(stderr, "Error while writing XTAL frequency to 
EEPROM: %i\n", r);
+               else
+                       fprintf(stderr, "XTAL frequency successfully 
written.\n");
+       }
+
        fprintf(stderr, "Current configuration:\n");
        parse_eeprom_to_conf(&conf, buf);
        dump_config(&conf);
-- 
1.7.10.4