- cmdstring[2] = 0x03;
- cmdstring[2] |= ((2 - ctx->voltage_ch1 % 3) << 6);
- cmdstring[2] |= ((2 - ctx->voltage_ch2 % 3) << 4);
-cmdstring[2] = 0x30;
+ cmdstring[2] = 0x30;
+
+ /* CH1 volts/div is encoded in bits 0-1 */
+ sr_dbg("hantek-dso: CH1 vdiv index %d", ctx->voltage_ch1);
+ switch (ctx->voltage_ch1) {
+ case VDIV_1V:
+ case VDIV_100MV:
+ case VDIV_10MV:
+ cmdstring[2] |= 0x00;
+ break;
+ case VDIV_2V:
+ case VDIV_200MV:
+ case VDIV_20MV:
+ cmdstring[2] |= 0x01;
+ break;
+ case VDIV_5V:
+ case VDIV_500MV:
+ case VDIV_50MV:
+ cmdstring[2] |= 0x02;
+ break;
+ }
+
+ /* CH2 volts/div is encoded in bits 2-3 */
+ sr_dbg("hantek-dso: CH2 vdiv index %d", ctx->voltage_ch2);
+ switch (ctx->voltage_ch2) {
+ case VDIV_1V:
+ case VDIV_100MV:
+ case VDIV_10MV:
+ cmdstring[2] |= 0x00;
+ break;
+ case VDIV_2V:
+ case VDIV_200MV:
+ case VDIV_20MV:
+ cmdstring[2] |= 0x08;
+ break;
+ case VDIV_5V:
+ case VDIV_500MV:
+ case VDIV_50MV:
+ cmdstring[2] |= 0x04;
+ break;
+ }