From d0c0270b9c8038ed7cb6f260052d111db73ee9b6 Mon Sep 17 00:00:00 2001
From: Michael Ossmann <mike@ossmann.com>
Date: Sun, 12 Dec 2021 13:25:44 -0700
Subject: [PATCH] clear frequency ranges before adding new ones

---
 firmware/common/operacake.c             | 5 +++++
 firmware/common/operacake.h             | 1 +
 firmware/hackrf_usb/usb_api_operacake.c | 1 +
 3 files changed, 7 insertions(+)

diff --git a/firmware/common/operacake.c b/firmware/common/operacake.c
index 4999b19b..f4acd306 100644
--- a/firmware/common/operacake.c
+++ b/firmware/common/operacake.c
@@ -294,6 +294,11 @@ uint8_t operacake_add_range(uint16_t freq_min, uint16_t freq_max, uint8_t port)
 	return 0;
 }
 
+void operacake_clear_ranges(void)
+{
+        range_idx = 0;
+}
+
 #define FREQ_ONE_MHZ (1000000ull)
 
 uint8_t operacake_set_range(uint32_t freq_mhz) {
diff --git a/firmware/common/operacake.h b/firmware/common/operacake.h
index 88bb135c..3b2621bb 100644
--- a/firmware/common/operacake.h
+++ b/firmware/common/operacake.h
@@ -50,6 +50,7 @@ uint8_t operacake_get_mode(uint8_t address);
 uint8_t operacake_set_ports(uint8_t address, uint8_t PA, uint8_t PB);
 uint8_t operacake_add_range(uint16_t freq_min, uint16_t freq_max, uint8_t port);
 uint8_t operacake_set_range(uint32_t freq_mhz);
+void operacake_clear_ranges(void);
 uint16_t gpio_test(uint8_t address);
 
 #ifdef __cplusplus
diff --git a/firmware/hackrf_usb/usb_api_operacake.c b/firmware/hackrf_usb/usb_api_operacake.c
index 00374522..43f14a52 100644
--- a/firmware/hackrf_usb/usb_api_operacake.c
+++ b/firmware/hackrf_usb/usb_api_operacake.c
@@ -65,6 +65,7 @@ usb_request_status_t usb_vendor_request_operacake_set_ranges(
 		if((num_ranges == 0) || (num_ranges > MAX_OPERACAKE_RANGES)) {
 			return USB_REQUEST_STATUS_STALL;
 		}
+		operacake_clear_ranges();
 		usb_transfer_schedule_block(endpoint->out, &data,
 				endpoint->setup.length, NULL, NULL);
 	} else if (stage == USB_TRANSFER_STAGE_DATA) {