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hantek-dso: relays now set properly 

They appear to be arranged to switch on/off a hierarchical series of
devices that attenuate the channel by an order of magnitude.
This commit is contained in:
Bert Vermeulen 2012-06-18 23:05:02 +02:00
parent 384c28d9e7
commit a217bcdf10
1 changed files with 17 additions and 10 deletions
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27
hardware/hantek-dso/dso.c
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@ -468,29 +468,27 @@ SR_PRIV int dso_set_voltage(struct context *ctx)
SR_PRIV int dso_set_relays(struct context *ctx)
{
int ret, cv1, cv2;
uint8_t relays[] = { 0x00, 0x04, 0x08, 0x02, 0x20, 0x40, 0x10, 0x01,
GString *gs;
int ret, i;
uint8_t relays[17] = { 0x00, 0x04, 0x08, 0x02, 0x20, 0x40, 0x10, 0x01,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
sr_dbg("hantek-dso: preparing CTRL_SETRELAYS");
cv1 = ctx->voltage_ch1 / 3;
cv2 = ctx->voltage_ch2 / 3;
if (cv1 > 0)
if (ctx->voltage_ch1 < VDIV_1V)
relays[1] = ~relays[1];
if (cv1 > 1)
if (ctx->voltage_ch1 < VDIV_100MV)
relays[2] = ~relays[2];
sr_dbg("hantek-dso: CH1 coupling %d", ctx->coupling_ch1);
if (ctx->coupling_ch1 != COUPLING_AC)
relays[3] = ~relays[3];
if (cv2 > 0)
if (ctx->voltage_ch2 < VDIV_1V)
relays[4] = ~relays[4];
if (cv2 > 1)
if (ctx->voltage_ch2 < VDIV_100MV)
relays[5] = ~relays[5];
sr_dbg("hantek-dso: CH2 coupling %d", ctx->coupling_ch1);
@ -500,9 +498,18 @@ SR_PRIV int dso_set_relays(struct context *ctx)
if (!strcmp(ctx->triggersource, "EXT"))
relays[7] = ~relays[7];
if (sr_log_loglevel_get() >= SR_LOG_DBG) {
gs = g_string_sized_new(128);
g_string_printf(gs, "hantek-dso: relays:");
for (i = 0; i < 17; i++)
g_string_append_printf(gs, " %.2x", relays[i]);
sr_dbg(gs->str);
g_string_free(gs, TRUE);
}
if ((ret = libusb_control_transfer(ctx->usb->devhdl,
LIBUSB_REQUEST_TYPE_VENDOR, CTRL_SETRELAYS,
0, 0, relays, sizeof(relays), 100)) != sizeof(relays)) {
0, 0, relays, 17, 100)) != sizeof(relays)) {
sr_err("failed to set relays: %d", ret);
return SR_ERR;
}