From d28d4e25e9566320f8f4a471fff758a283de797c Mon Sep 17 00:00:00 2001
From: KT315AM <kt@315.am>
Date: Sun, 19 Jul 2026 07:29:29 +0700
Subject: [PATCH] Add method Si5351::reset_freq()

---
 README.md      | 13 +++++++++++++
 src/si5351.cpp | 20 +++++++++++++++++---
 src/si5351.h   |  7 ++++---
 3 files changed, 34 insertions(+), 6 deletions(-)

diff --git a/README.md b/README.md
index 3a142af..65e9bd2 100644
--- a/README.md
+++ b/README.md
@@ -299,6 +299,19 @@ bool Si5351::init(uint8_t xtal_load_c, uint32_t ref_osc_freq, uint32_t ref_osc_f
  */
 void Si5351::reset(void)
 ```
+### reset_freq()
+```
+/*
+ * reset_freq(enum si5351_clock clk)
+ *
+ * Sets the clock frequency of the specified CLK output to initial value.
+ * Set 0 Hz and disable output.
+ *
+ * clk - Clock output
+ *   (use the si5351_clock enum)
+ */
+void Si5351::reset_freq(enum si5351_clock clk)
+```
 ### set_freq()
 ```
 /*
diff --git a/src/si5351.cpp b/src/si5351.cpp
index 2adecd9..5a54c5c 100644
--- a/src/si5351.cpp
+++ b/src/si5351.cpp
@@ -173,12 +173,26 @@ void Si5351::reset(void)
 	uint8_t i;
 	for(i = 0; i < 8; i++)
 	{
-		clk_freq[i] = 0;
-		output_enable((enum si5351_clock)i, 0);
-		clk_first_set[i] = false;
+		reset_freq((enum si5351_clock)i);
 	}
 }
 
+/*
+ * reset_freq(enum si5351_clock clk)
+ *
+ * Sets the clock frequency of the specified CLK output to initial value.
+ * Set 0 Hz and disable output.
+ *
+ * clk - Clock output
+ *   (use the si5351_clock enum)
+ */
+void Si5351::reset_freq(enum si5351_clock clk)
+{
+	clk_freq[(uint8_t)clk] = 0;
+	output_enable(clk, 0);
+	clk_first_set[(uint8_t)clk] = false;
+}
+
 /*
  * set_freq(uint64_t freq, enum si5351_clock clk)
  *
diff --git a/src/si5351.h b/src/si5351.h
index 59c16e9..f1d5876 100644
--- a/src/si5351.h
+++ b/src/si5351.h
@@ -282,6 +282,7 @@ class Si5351
   Si5351(uint8_t i2c_addr = SI5351_BUS_BASE_ADDR);
 	bool init(uint8_t, uint32_t, int32_t);
 	void reset(void);
+	void reset_freq(enum si5351_clock);
 	uint8_t set_freq(uint64_t, enum si5351_clock);
 	uint8_t set_freq_manual(uint64_t, uint64_t, enum si5351_clock);
 	void set_pll(uint64_t, enum si5351_pll);
@@ -302,7 +303,7 @@ class Si5351
 	void set_clock_fanout(enum si5351_clock_fanout, uint8_t);
 	void set_pll_input(enum si5351_pll, enum si5351_pll_input);
 	void set_vcxo(uint64_t, uint8_t);
-  void set_ref_freq(uint32_t, enum si5351_pll_input);
+  	void set_ref_freq(uint32_t, enum si5351_pll_input);
 	uint8_t si5351_write_bulk(uint8_t, uint8_t, uint8_t *);
 	uint8_t si5351_write(uint8_t, uint8_t);
 	uint8_t si5351_read(uint8_t);
@@ -314,8 +315,8 @@ class Si5351
 	uint64_t clk_freq[8];
 	uint64_t plla_freq;
 	uint64_t pllb_freq;
-  enum si5351_pll_input plla_ref_osc;
-  enum si5351_pll_input pllb_ref_osc;
+  	enum si5351_pll_input plla_ref_osc;
+  	enum si5351_pll_input pllb_ref_osc;
 	uint32_t xtal_freq[2];
 private:
 	uint64_t pll_calc(enum si5351_pll, uint64_t, struct Si5351RegSet *, int32_t, uint8_t);