Fix #1785 1/2

Author: antoinevg

firmware/common/radio.c

@@ -433,7 +433,7 @@ static uint32_t radio_update_frequency(radio_t* const radio, uint64_t* bank)
 		freq_if = max283x_set_frequency(&max283x, requested_if, false);
 	}
 	if (requested_lo != RADIO_UNSET) {
-		freq_lo = mixer_set_frequency(&mixer, freq_lo, false);
+		freq_lo = mixer_set_frequency(&mixer, requested_lo, false);
 	}
 #ifdef IS_PRALINE
 	if (IS_PRALINE) {

firmware/hackrf_usb/usb_api_radio.c

@@ -98,6 +98,11 @@ usb_request_status_t usb_vendor_request_set_radio_frequency_explicit(
 			NULL,
 			NULL);
 	} else if (stage == USB_TRANSFER_STAGE_DATA) {
+		radio_reg_write(
+			&radio,
+			RADIO_BANK_ACTIVE,
+			RADIO_FREQUENCY_RF,
+			RADIO_UNSET);
 		radio_reg_write(
 			&radio,
 			RADIO_BANK_ACTIVE,

firmware/hackrf_usb/usb_api_transceiver.c

@@ -158,6 +158,11 @@ usb_request_status_t usb_vendor_request_set_freq_explicit(
 			NULL,
 			NULL);
 	} else if (stage == USB_TRANSFER_STAGE_DATA) {
+		radio_reg_write(
+			&radio,
+			RADIO_BANK_ACTIVE,
+			RADIO_FREQUENCY_RF,
+			RADIO_UNSET);
 		radio_reg_write(
 			&radio,
 			RADIO_BANK_ACTIVE,