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add a sine wave to demo.c

This commit is contained in:
Daniel Ribeiro 2011-01-21 12:52:12 -02:00
parent c3579621d5
commit 8038e90aef
1 changed files with 14 additions and 1 deletions
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15
hardware/demo/demo.c
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@ -19,12 +19,13 @@
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
//#define DEMO_ANALOG
#define DEMO_ANALOG
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sigrok.h>
#include <math.h>
#ifdef _WIN32
#include <io.h>
#include <fcntl.h>
@ -49,6 +50,7 @@ enum {
GENMODE_DEFAULT,
GENMODE_RANDOM,
GENMODE_INC,
GENMODE_SINE,
};
GIOChannel *channels[2];
@ -74,6 +76,7 @@ static int capabilities[] = {
static const char *patternmodes[] = {
"random",
"incremental",
"sine",
NULL,
};
@ -206,6 +209,9 @@ static int hw_set_configuration(int device_index, int capability, void *value)
} else if (!strcmp(stropt, "incremental")) {
default_genmode = GENMODE_INC;
ret = SIGROK_OK;
} else if (!strcmp(stropt, "sine")) {
default_genmode = GENMODE_SINE;
ret = SIGROK_OK;
} else {
ret = SIGROK_ERR;
}
@ -235,6 +241,13 @@ static void samples_generator(uint8_t *buf, uint64_t size, void *data)
switch (mydata->sample_generator) {
default:
case GENMODE_DEFAULT:
case GENMODE_SINE:
for (i = 0; i < size * 3; i += 3) {
*(buf + i) = i / 3;
*(uint16_t *) (buf + i + 1) =
(uint16_t) (sin(i / 3) * 256 * 30);
}
break;
case GENMODE_RANDOM:
for (i = 0; i < size * 3; i += 3) {
*(buf + i) = (uint8_t)(rand() & 0xff);