- Initial commit of base firmware - which is still very raw

Firmware/Rotary_Encoder.c

@@ -0,0 +1,141 @@
+/*
+ * Rotary_Encoder.c
+ *
+ * Created: Mon Nov 29 2021 11:27:29
+ *  Author Chris
+ */
+
+// ============================================================================================
+// Includes
+#include "Rotary_Encoder.h"
+
+#include "pico/time.h"
+#include "pico/types.h"
+#include "pico/stdlib.h"
+#include "hardware/gpio.h"
+
+
+// ============================================================================================
+// Defines
+#define ENCODER_PIN_A_GPIO			25
+#define ENCODER_PIN_B_GPIO			24
+#define ENCODER_SWITCH_GPIO			27
+
+#define GPIO_IRQ_LEVEL_LOW 			1
+#define GPIO_IRQ_LEVEL_HIGH			2
+#define GPIO_IRQ_EDGE_FALL			4
+#define GPIO_IRQ_EDGE_RISE			8
+
+#define SWITCH_IDLE					1
+#define SWITCH_PRESSED				0
+
+#define DEBOUNCE_TIME_ENCODER_MS	50	
+#define DEBOUNCE_TIME_SWITCH_MS		300	
+
+
+// ============================================================================================
+// Variables
+static volatile uint32_t	_Debounce_Time_Encoder_ms 	= 0;
+static volatile uint32_t	_Debounce_Time_Switch_ms 	= 0;
+
+static volatile bool		_Rotation_CW_Occurred;
+static volatile bool		_Rotation_CCW_Occurred;
+static volatile bool		_Switch_Press_Occurred;
+
+static volatile uint8_t 	_Rotary_Encoder_Previous_NextCode = 0;
+static volatile uint16_t 	_Rotary_Encoder_Store_State = 0;
+static volatile int8_t 		_Rotary_Encoder_Table[] = { 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0 };
+
+
+// ============================================================================================
+// Function Declarations
+
+
+/*******************************************************************
+	Interrupt Service Routines
+*******************************************************************/
+void ISR_Rotary_Encoder(uint gpio, uint32_t events)
+{
+	if(gpio == ENCODER_PIN_A_GPIO || gpio == ENCODER_PIN_B_GPIO)
+	{
+		_Rotary_Encoder_Previous_NextCode <<= 2;
+		if(gpio_get(ENCODER_PIN_A_GPIO)) { _Rotary_Encoder_Previous_NextCode |= 0x02; }
+		if(gpio_get(ENCODER_PIN_B_GPIO)) {	_Rotary_Encoder_Previous_NextCode |= 0x01; }
+		_Rotary_Encoder_Previous_NextCode &= 0x0f;
+
+		// If valid then _Rotary_Encoder_Store_State as 16 bit data.
+		if(_Rotary_Encoder_Table[_Rotary_Encoder_Previous_NextCode])
+		{
+			_Rotary_Encoder_Store_State <<= 4;
+			_Rotary_Encoder_Store_State |= _Rotary_Encoder_Previous_NextCode;
+
+			if((_Rotary_Encoder_Store_State & 0xFF)==0x2B) { _Rotation_CCW_Occurred = true; }
+			if((_Rotary_Encoder_Store_State & 0xFF)==0x17) { _Rotation_CW_Occurred  = true; }
+		}
+	}
+	else if(gpio == ENCODER_SWITCH_GPIO)
+	{
+		uint32_t Current_Time_ms = to_ms_since_boot(get_absolute_time());
+
+		if(Current_Time_ms < _Debounce_Time_Switch_ms)
+		{
+			return;
+		}
+
+		_Switch_Press_Occurred = true;
+
+		_Debounce_Time_Switch_ms = Current_Time_ms + DEBOUNCE_TIME_SWITCH_MS;
+	}
+}
+
+
+/*******************************************************************
+	Functions
+*******************************************************************/
+void Rotary_Encoder_Init(void)
+{
+	_Rotation_CW_Occurred 		= false;
+	_Rotation_CCW_Occurred 		= false;
+	_Switch_Press_Occurred		= false;
+
+	
+	gpio_init(ENCODER_PIN_A_GPIO);	gpio_set_dir(ENCODER_PIN_A_GPIO, false);
+	gpio_init(ENCODER_PIN_B_GPIO);	gpio_set_dir(ENCODER_PIN_B_GPIO, false);
+	gpio_init(ENCODER_SWITCH_GPIO);	gpio_set_dir(ENCODER_SWITCH_GPIO, false);
+	
+	gpio_set_irq_enabled_with_callback(ENCODER_PIN_A_GPIO, GPIO_IRQ_EDGE_RISE | GPIO_IRQ_EDGE_FALL, true, &ISR_Rotary_Encoder);
+	gpio_set_irq_enabled(ENCODER_PIN_B_GPIO, GPIO_IRQ_EDGE_RISE | GPIO_IRQ_EDGE_FALL, true);
+	gpio_set_irq_enabled(ENCODER_SWITCH_GPIO, GPIO_IRQ_EDGE_FALL , true);
+}
+
+bool Rotary_Encoder_Rotation_CW_Occurred(void)
+{
+	bool Return_Value = _Rotation_CW_Occurred;
+
+	_Rotation_CW_Occurred = false;
+
+	return Return_Value;
+}
+
+bool Rotary_Encoder_Rotation_CCW_Occurred(void)
+{
+	bool Return_Value = _Rotation_CCW_Occurred;
+
+	_Rotation_CCW_Occurred = false;
+
+	return Return_Value;
+}
+
+bool Rotary_Encoder_Switch_Press_Occurred(void)
+{
+	bool Return_Value = _Switch_Press_Occurred;
+
+	_Switch_Press_Occurred = false;
+
+	return Return_Value;
+}
+
+
+/*******************************************************************
+	Internal Functions
+*******************************************************************/