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hantek-dso: hopefully handle endianness in voltage setting

This commit is contained in:
Bert Vermeulen 2012-05-20 01:14:37 +02:00
parent 4a090d722d
commit 2715c0b86b
2 changed files with 57 additions and 25 deletions
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79
hardware/hantek-dso/dso.c
View File

@ -26,6 +26,7 @@
#include <string.h>
#include <glib.h>
#include <libusb.h>
#include <arpa/inet.h>
extern libusb_context *usb_context;
extern GSList *dev_insts;
@ -200,7 +201,8 @@ SR_PRIV void dso_close(struct sr_dev_inst *sdi)
static int get_channel_offsets(struct context *ctx)
{
int ret;
GString *gs;
int chan, v, ret;
sr_dbg("hantek-dso: getting channel offsets");
@ -214,6 +216,32 @@ static int get_channel_offsets(struct context *ctx)
return SR_ERR;
}
/* Comes in as 16-bit numbers with the second byte always 0 on
* the DSO-2090. Guessing this is supposed to be big-endian,
* since that's how voltage offsets are submitted back to the DSO.
* Convert to host order now, so we can use them natively.
*/
for (chan = 0; chan < 2; chan++) {
for (v = 0; v < 9; v++) {
ctx->channel_levels[chan][v][0] = ntohs(ctx->channel_levels[chan][v][0]);
ctx->channel_levels[chan][v][1] = ntohs(ctx->channel_levels[chan][v][1]);
}
}
if (sr_log_loglevel_get() >= SR_LOG_DBG) {
gs = g_string_sized_new(128);
for (chan = 0; chan < 2; chan++) {
g_string_printf(gs, "hantek-dso: CH%d:", chan + 1);
for (v = 0; v < 9; v++) {
g_string_append_printf(gs, " %.4x-%.4x",
ctx->channel_levels[chan][v][0],
ctx->channel_levels[chan][v][1]);
}
sr_dbg(gs->str);
}
g_string_free(gs, TRUE);
}
return SR_OK;
}
@ -488,31 +516,33 @@ SR_PRIV int dso_set_voffsets(struct context *ctx)
{
int offset, ret;
uint16_t *ch_levels;
// uint8_t offsets[17];
uint8_t offsets[] = {0x20,0x75,0x30,0x3f,0x20,0xbd,0x3f,0x02,0x20,0x00,0x71,0x01,0x2e,0x0b,0x3f,0x02,0x50};
//uint8_t offsets[] = {0xff, 0x75, 0x30, 0x3f, 0x20, 0xbd,
// 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
//};
uint8_t offsets[17];
sr_dbg("hantek-dso: sending CTRL_SETOFFSET");
sr_dbg("hantek-dso: preparing CTRL_SETOFFSET");
// memset(offsets, 0, sizeof(offsets));
// /* Channel 1 */
// ch_levels = ctx->channel_levels[0][VOLTAGE_10mV - ctx->voltage_ch1];
// offset = (ch_levels[1] - ch_levels[0]) * ctx->voffset_ch1 + ch_levels[0];
// offsets[0] = (offset >> 8) | 0x20;
// offsets[1] = offset & 0xff;
//
// /* Channel 2 */
// ch_levels = ctx->channel_levels[1][VOLTAGE_10mV - ctx->voltage_ch2];
// offset = (ch_levels[1] - ch_levels[0]) * ctx->voffset_ch2 + ch_levels[0];
// offsets[2] = (offset >> 8) | 0x20;
// offsets[3] = offset & 0xff;
//
// /* Trigger */
// offset = MAX_VERT_TRIGGER * ctx->voffset_trigger;
// offsets[4] = (offset >> 8) | 0x20;
// offsets[5] = offset & 0xff;
memset(offsets, 0, sizeof(offsets));
/* Channel 1 */
ch_levels = ctx->channel_levels[0][ctx->voltage_ch1];
offset = (ch_levels[1] - ch_levels[0]) * ctx->voffset_ch1 + ch_levels[0];
offsets[0] = (offset >> 8) | 0x20;
offsets[1] = offset & 0xff;
sr_dbg("hantek-dso: CH1 offset %3.2f (%.2x%.2x)", ctx->voffset_ch1,
offsets[0], offsets[1]);
/* Channel 2 */
ch_levels = ctx->channel_levels[1][ctx->voltage_ch2];
offset = (ch_levels[1] - ch_levels[0]) * ctx->voffset_ch2 + ch_levels[0];
offsets[2] = (offset >> 8) | 0x20;
offsets[3] = offset & 0xff;
sr_dbg("hantek-dso: CH2 offset %3.2f (%.2x%.2x)", ctx->voffset_ch2,
offsets[2], offsets[3]);
/* Trigger */
offset = MAX_VERT_TRIGGER * ctx->voffset_trigger;
offsets[4] = (offset >> 8) | 0x20;
offsets[5] = offset & 0xff;
sr_dbg("hantek-dso: trigger offset %3.2f (%.2x%.2x)", ctx->voffset_trigger,
offsets[4], offsets[5]);
if ((ret = libusb_control_transfer(ctx->usb->devhdl,
LIBUSB_REQUEST_TYPE_VENDOR, CTRL_SETOFFSET,
@ -520,6 +550,7 @@ uint8_t offsets[] = {0x20,0x75,0x30,0x3f,0x20,0xbd,0x3f,0x02,0x20,0x00,0x71,0x01
sr_err("failed to set offsets: %d", ret);
return SR_ERR;
}
sr_dbg("hantek-dso: sent CTRL_SETOFFSET");
return SR_OK;
}

3
hardware/hantek-dso/dso.h
View File

@ -39,7 +39,7 @@
#define DEFAULT_COUPLING COUPLING_AC
#define DEFAULT_HORIZ_TRIGGERPOS 0.5
#define DEFAULT_VERT_OFFSET 0.5
#define DEFAULT_VERT_TRIGGERPOS 0.0
#define DEFAULT_VERT_TRIGGERPOS 0.5
#define MAX_VERT_TRIGGER 0xfe
@ -76,6 +76,7 @@ enum dso_commands {
enum couplings {
COUPLING_AC = 0,
COUPLING_DC,
/* TODO not used, how to enable? */
COUPLING_GND
};