From bb472ddaad7ab7056fb22f22738d1879867c9b03 Mon Sep 17 00:00:00 2001
From: Vladimir Garistov <vl.garistov@gmail.com>
Date: Mon, 15 Jul 2024 13:20:54 +0300
Subject: [PATCH] FEAT: Added a SPI digital potentiometer example

---
 .../SPI_digital_pot_MCP4261.ino               | 34 +++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 Examples/SPI/SPI_digital_pot_MCP4261/SPI_digital_pot_MCP4261.ino

diff --git a/Examples/SPI/SPI_digital_pot_MCP4261/SPI_digital_pot_MCP4261.ino b/Examples/SPI/SPI_digital_pot_MCP4261/SPI_digital_pot_MCP4261.ino
new file mode 100644
index 0000000..6c09275
--- /dev/null
+++ b/Examples/SPI/SPI_digital_pot_MCP4261/SPI_digital_pot_MCP4261.ino
@@ -0,0 +1,34 @@
+#include <SPI.h>
+
+#define INPUT_PIN	A0
+
+#define WRITE_CMD	0x00
+#define INCR_CMD	0x01
+#define DECR_CMD	0x02
+#define READ_CMD	0x03
+
+#define WIPER0_ADDR	0x00
+#define WIPER1_ADDR	0x01
+
+#define ADDR_OFFSET	12U
+#define CMD_OFFSET	10U
+
+#define POT_MIN		0U
+#define POT_MAX		256U
+
+void setup()
+{
+	pinMode(INPUT_PIN, INPUT);
+	SPI.begin();
+}
+
+void loop()
+{
+	SPI.beginTransaction(SPISettings(10000000, MSBFIRST, SPI_MODE0));
+	SPI.transfer16(
+		WRITE_CMD << CMD_OFFSET |
+		WIPER0_ADDR << ADDR_OFFSET |
+		map(analogRead(INPUT_PIN), 0, 1023, 0, 256));
+	SPI.endTransaction();
+	delay(5);
+}
-- 
2.39.5