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dddvb/apps/setmod3.c

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C
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#include <errno.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdint.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <pthread.h>
#include <linux/dvb/mod.h>
static int set_property(int fd, uint32_t cmd, uint32_t data)
{
struct dtv_property p;
struct dtv_properties c;
int ret;
p.cmd = cmd;
c.num = 1;
c.props = &p;
p.u.data = data;
ret = ioctl(fd, FE_SET_PROPERTY, &c);
if (ret < 0) {
fprintf(stderr, "FE_SET_PROPERTY returned %d\n", errno);
return -1;
}
return 0;
}
static int get_property(int fd, uint32_t cmd, uint32_t *data)
{
struct dtv_property p;
struct dtv_properties c;
int ret;
p.cmd = cmd;
c.num = 1;
c.props = &p;
ret = ioctl(fd, FE_GET_PROPERTY, &c);
if (ret < 0) {
fprintf(stderr, "FE_GET_PROPERTY returned %d\n", ret);
return -1;
}
*data = p.u.data;
return 0;
}
int main()
{
int fd;
struct dvb_mod_params mp;
struct dvb_mod_channel_params mc;
uint32_t data;
fd = open("/dev/dvb/adapter0/mod0", O_RDONLY);
/* gain 0-255 */
get_property(fd, MODULATOR_GAIN, &data);
printf("Modulator gain = %u\n", data);
set_property(fd, MODULATOR_GAIN, 100);
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get_property(fd, MODULATOR_GAIN, &data);
printf("Modulator gain = %u\n", data);
get_property(fd, MODULATOR_ATTENUATOR, &data);
printf("Modulator attenuator = %u\n", data);
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get_property(fd, MODULATOR_STATUS, &data);
printf("Modulator status = %u\n", data);
set_property(fd, MODULATOR_STATUS, 2);
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//set_property(fd, MODULATOR_RESET, 0);
close(fd);
}