return SR_OK;
}
+
+static void dso2250_set_triggerpos(int value, int long_buffer, uint8_t dest[], int offset)
+{
+ uint32_t min, max;
+ uint32_t tmp, diff;
+
+ min = long_buffer ? 0 : 0x7d7ff;
+ max = 0x7ffff;
+
+ diff = max - min;
+ tmp = min + diff * value / 100;
+ sr_dbg("2250 trigger pos: %3d%% * [0x%x,0x%x] == 0x%x", value, min, max, tmp);
+
+ dest[offset + 0] = tmp & 0xff;
+ dest[offset + 1] = (tmp >> 8) & 0xff;
+ dest[offset + 2] = (tmp >> 16) & 0x7;
+}
+
+
/* See http://openhantek.sourceforge.net/doc/namespaceHantek.html#ac1cd181814cf3da74771c29800b39028 */
static int dso2250_set_trigger_samplerate(const struct sr_dev_inst *sdi)
{
int ret, tmp;
int base;
uint8_t cmdstring[12];
+ int trig;
devc = sdi->priv;
memset(cmdstring, 0, sizeof(cmdstring));
cmdstring[0] = CMD_2250_SET_SAMPLERATE;
- /* Timebase fast */
- sr_dbg("Time base index: %d.", devc->timebase);
+ sr_dbg("Sample rate: %u", devc->samplerate);
base = 100e6;
- if (devc->timebase < TIME_40us) {
- if (devc->framesize != FRAMESIZE_SMALL) {
- sr_err("Timebase < 40us only supported with 10K buffer.");
- return SR_ERR_ARG;
- }
-
- /* Fast mode on */
- base = 200e6;
- cmdstring[2] |= 1;
+ if (devc->samplerate > base) {
+ /* Timebase fast */
+ sr_err("Sample rate > 100MHz not yet supported.");
+ return SR_ERR_ARG;
}
- /* Downsampling on */
- cmdstring[2] |= 2;
- /* Downsampler = 1comp((Base / Samplerate) - 2)
- * Base == 100Msa resp. 200MSa
- *
- * Example for 500kSa/s:
- * 100e6 / 500e3 => 200
- * 200 - 2 => 198
- * 1comp(198) => ff39 */
-
- tmp = base * timebase_to_time(devc->timebase);
- tmp = 200;
- if (tmp < 0)
- return SR_ERR_ARG;
- tmp -= 2;
- if (tmp < 0)
- return SR_ERR_ARG;
- tmp = ~tmp;
- sr_dbg("sample rate value: 0x%x.", tmp & 0xffff);
- cmdstring[4] = (tmp >> 0) & 0xff;
- cmdstring[5] = (tmp >> 8) & 0xff;
+ tmp = base / devc->samplerate;
+ sr_dbg("sample rate value: %d.", devc->samplerate);
+ if (tmp) {
+ /* Downsampling on */
+ cmdstring[2] |= 2;
+ /* Downsampler = 1comp((Base / Samplerate) - 2)
+ * Base == 100Msa resp. 200MSa
+ *
+ * Example for 500kSa/s:
+ * 100e6 / 500e3 => 200
+ * 200 - 2 => 198
+ * 1comp(198) => ff39 */
+ tmp -= 2;
+ tmp = ~tmp;
+ sr_dbg("down sampler value: 0x%x.", tmp & 0xffff);
+ cmdstring[4] = (tmp >> 0) & 0xff;
+ cmdstring[5] = (tmp >> 8) & 0xff;
+ }
if (send_begin(sdi) != SR_OK)
return SR_ERR;
memset(cmdstring, 0, sizeof(cmdstring));
cmdstring[0] = CMD_2250_SET_TRIGGERPOS_AND_BUFFER;
- /* TODO for big buffer */
- /* TODO */
- sr_dbg("Trigger position: %3.2f.", devc->triggerposition);
-// tmp = 0x77fff + 0x8000 * devc->triggerposition;
-// cmdstring[6] = tmp & 0xff;
-// cmdstring[7] = (tmp >> 8) & 0xff;
-// cmdstring[10] = (tmp >> 16) & 0xff;
-
- cmdstring[2]=0xff;
- cmdstring[3]=0xff;
- cmdstring[4]=0x07;
-
- cmdstring[6]=0xff;
- cmdstring[7]=0xd7;
- cmdstring[8]=0x07;
+ sr_dbg("Capture ratio: %d.", devc->capture_ratio);
+ trig = devc->capture_ratio;
+ dso2250_set_triggerpos(trig,
+ devc->framesize != FRAMESIZE_SMALL, cmdstring, 2);
+ dso2250_set_triggerpos(100 - trig,
+ devc->framesize != FRAMESIZE_SMALL, cmdstring, 6);
if (send_begin(sdi) != SR_OK)
return SR_ERR;
return SR_OK;
}
-static int dso_set_trigger_samplerate(const struct sr_dev_inst *sdi)
+int dso_set_trigger_samplerate(const struct sr_dev_inst *sdi)
{
struct dev_context *devc;
struct sr_usb_dev_inst *usb;
cmdstring[5] = (tmp >> 8) & 0xff;
/* Horizontal trigger position */
- sr_dbg("Trigger position: %3.2f.", devc->triggerposition);
- tmp = 0x77fff + 0x8000 * devc->triggerposition;
+ sr_dbg("Capture ratio: %d.", devc->capture_ratio);
+ tmp = 0x77fff + 0x8000 * devc->capture_ratio / 100;
cmdstring[6] = tmp & 0xff;
cmdstring[7] = (tmp >> 8) & 0xff;
cmdstring[10] = (tmp >> 16) & 0xff;
return SR_OK;
}
-static int dso_set_voffsets(const struct sr_dev_inst *sdi)
+int dso_set_voffsets(const struct sr_dev_inst *sdi)
{
struct dev_context *devc;
struct sr_usb_dev_inst *usb;