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analog: Fix analog_to_float typos, and cleanup. 

This was adding 1 to every measurement being converted.
This commit is contained in:
Bert Vermeulen 2014-11-17 23:08:49 +01:00
parent 41caa31909
commit 4b4fdeea94
1 changed files with 9 additions and 9 deletions
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18
src/analog.c
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@ -58,7 +58,7 @@ SR_PRIV int sr_analog_init(struct sr_datafeed_analog2 *analog,
}
SR_API int sr_analog_to_float(const struct sr_datafeed_analog2 *analog,
float *buf)
float *outbuf)
{
float offset;
unsigned int b, i;
@ -71,28 +71,28 @@ SR_API int sr_analog_to_float(const struct sr_datafeed_analog2 *analog,
#endif
if (!analog->encoding->is_float) {
/* TODO */
sr_err("Only floating-point analog data supported so far.");
sr_err("Only floating-point encoding supported so far.");
return SR_ERR;
}
if (analog->encoding->unitsize == sizeof(float)
&& analog->encoding->is_bigendian == bigendian
&& (analog->encoding->scale.p == analog->encoding->scale.q)
&& analog->encoding->scale.p / (float)analog->encoding->scale.q == 0) {
&& analog->encoding->offset.p / (float)analog->encoding->offset.q == 0) {
/* The data is already in the right format. */
memcpy(buf, analog->data, analog->num_samples * sizeof(float));
memcpy(outbuf, analog->data, analog->num_samples * sizeof(float));
} else {
for (i = 0; i < analog->num_samples; i += analog->encoding->unitsize) {
for (b = 0; b < analog->encoding->unitsize; b++) {
if (analog->encoding->is_bigendian == bigendian)
buf[i + b] = ((float *)analog->data)[i * analog->encoding->unitsize + b];
outbuf[i + b] = ((float *)analog->data)[i * analog->encoding->unitsize + b];
else
buf[i + (analog->encoding->unitsize - b)] = ((float *)analog->data)[i * analog->encoding->unitsize + b];
outbuf[i + (analog->encoding->unitsize - b)] = ((float *)analog->data)[i * analog->encoding->unitsize + b];
}
if (analog->encoding->scale.p != analog->encoding->scale.q)
buf[i] = (buf[i] * analog->encoding->scale.p) / analog->encoding->scale.q;
offset = ((float)analog->encoding->scale.p / (float)analog->encoding->scale.q);
buf[i] += offset;
outbuf[i] = (outbuf[i] * analog->encoding->scale.p) / analog->encoding->scale.q;
offset = ((float)analog->encoding->offset.p / (float)analog->encoding->offset.q);
outbuf[i] += offset;
}
}