From 467a72cf8e9d4631cb553f0a1a67e91c2fe85885 Mon Sep 17 00:00:00 2001
From: Michael Ossmann <mike@ossmann.com>
Date: Tue, 24 Feb 2026 20:26:24 -0500
Subject: [PATCH] Remove fractional sample rate radio register

---
 firmware/common/radio.h              | 40 ++++++++++++----------------
 host/hackrf-tools/src/hackrf_debug.c |  2 +-
 2 files changed, 18 insertions(+), 24 deletions(-)

diff --git a/firmware/common/radio.h b/firmware/common/radio.h
index 5922977f..59f9592a 100644
--- a/firmware/common/radio.h
+++ b/firmware/common/radio.h
@@ -106,88 +106,82 @@ typedef enum {
 	 * Sample rate (as seen by MCU/host) in 1/(2**24) Hz.
 	 */
 	RADIO_SAMPLE_RATE = 6,
-	/**
-	 * Sample rate (as seen by MCU/host) in fractional format. The
-	 * numerator is stored in the low 32 bits. The denominator is stored in
-	 * the high 32 bits.
-	 */
-	RADIO_SAMPLE_RATE_FRAC = 7,
 	/**
 	 * Base two logarithm of TX decimation ratio (0 means a ratio of 1).
 	 */
-	RADIO_RESAMPLE_TX = 8,
+	RADIO_RESAMPLE_TX = 7,
 	/**
 	 * Base two logarithm of RX decimation ratio (0 means a ratio of 1).
 	 */
-	RADIO_RESAMPLE_RX = 9,
+	RADIO_RESAMPLE_RX = 8,
 	/**
 	 * TX RF amplifier enable of type bool.
 	 */
-	RADIO_GAIN_TX_RF = 10,
+	RADIO_GAIN_TX_RF = 9,
 	/**
 	 * TX IF amplifier gain in dB.
 	 */
-	RADIO_GAIN_TX_IF = 11,
+	RADIO_GAIN_TX_IF = 10,
 	/**
 	 * RX RF amplifier enable of type bool.
 	 */
-	RADIO_GAIN_RX_RF = 12,
+	RADIO_GAIN_RX_RF = 11,
 	/**
 	 * RX IF amplifier gain in dB.
 	 */
-	RADIO_GAIN_RX_IF = 13,
+	RADIO_GAIN_RX_IF = 12,
 	/**
 	 * RX baseband amplifier gain in dB.
 	 */
-	RADIO_GAIN_RX_BB = 14,
+	RADIO_GAIN_RX_BB = 13,
 	/**
 	 * TX baseband bandwidth in Hz. This controls analog baseband filter
 	 * settings but is specified as the desired bandwidth centered in
 	 * digital baseband as seen by the MCU/host.
 	 */
-	RADIO_BB_BANDWIDTH_TX = 15,
+	RADIO_BB_BANDWIDTH_TX = 14,
 	/**
 	 * RX baseband bandwidth in Hz. This controls analog baseband filter
 	 * settings but is specified as the desired bandwidth centered in
 	 * digital baseband as seen by the MCU/host.
 	 */
-	RADIO_BB_BANDWIDTH_RX = 16,
+	RADIO_BB_BANDWIDTH_RX = 15,
 	/**
 	 * Quadrature transceiver TX baseband LPF bandwidth in Hz.  If no
 	 * rotation is performed, this is set to match RADIO_BB_BANDWIDTH.
 	 * Currently unused.
 	 */
-	RADIO_XCVR_TX_LPF = 17,
+	RADIO_XCVR_TX_LPF = 16,
 	/**
 	 * Quadrature transceiver RX baseband LPF bandwidth in Hz.  If no
 	 * rotation is performed, this is set to match RADIO_BB_BANDWIDTH.
 	 * Currently unused.
 	 */
-	RADIO_XCVR_RX_LPF = 18,
+	RADIO_XCVR_RX_LPF = 17,
 	/**
 	 * Quadrature transceiver RX baseband HPF bandwidth in Hz. Currently
 	 * unused.
 	 */
-	RADIO_XCVR_RX_HPF = 19,
+	RADIO_XCVR_RX_HPF = 18,
 	/**
 	 * Narrowband RX analog baseband LPF enable of type bool. Currently unused.
 	 */
-	RADIO_RX_NARROW_LPF = 20,
+	RADIO_RX_NARROW_LPF = 19,
 	/**
 	 * RF port bias tee enable of type bool.
 	 */
-	RADIO_BIAS_TEE = 21,
+	RADIO_BIAS_TEE = 20,
 	/**
 	 * Trigger input enable of type bool.
 	 */
-	RADIO_TRIGGER = 22,
+	RADIO_TRIGGER = 21,
 	/**
 	 * DC block enable of type bool.
 	 */
-	RADIO_DC_BLOCK = 23,
+	RADIO_DC_BLOCK = 22,
 } radio_register_t;
 
-#define RADIO_NUM_REGS (24)
+#define RADIO_NUM_REGS (23)
 #define RADIO_UNSET    (0xffffffffffffffff)
 
 /**
diff --git a/host/hackrf-tools/src/hackrf_debug.c b/host/hackrf-tools/src/hackrf_debug.c
index 5f8785b5..52ede9cb 100644
--- a/host/hackrf-tools/src/hackrf_debug.c
+++ b/host/hackrf-tools/src/hackrf_debug.c
@@ -501,7 +501,7 @@ int radio_read_register(
 	return result;
 }
 
-#define RADIO_NUM_REGS (24)
+#define RADIO_NUM_REGS (23)
 
 int radio_read_registers(hackrf_device* device, const uint8_t bank)
 {