From dda6c7a2ad7819129e99ca8c1a7ccc301c41a8c5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Andis=20Z=C4=ABle?= <andis.jargans@gmail.com>
Date: Wed, 10 Apr 2024 15:45:50 +0300
Subject: [PATCH] Created button class

---
 firmware/src/hw/button.cpp | 85 ++++++++++++++++++++++++++++++++++++++
 firmware/src/hw/button.h   | 41 ++++++++++++++++++
 2 files changed, 126 insertions(+)
 create mode 100644 firmware/src/hw/button.cpp
 create mode 100644 firmware/src/hw/button.h

diff --git a/firmware/src/hw/button.cpp b/firmware/src/hw/button.cpp
new file mode 100644
index 0000000..12fc029
--- /dev/null
+++ b/firmware/src/hw/button.cpp
@@ -0,0 +1,85 @@
+/**** Includes ****/
+#include "../utils/utils.h"
+#include "button.h"
+
+using namespace hw;
+
+/**** Private definitions ****/
+/**** Private constants ****/
+/**** Private variables ****/
+/**** Private function declarations ****/
+
+/**** Public function definitions ****/
+hw::Button::Button(board::DigitalIn* din_ch, uint8_t act_lvl, uint8_t dbnc_lim, uint8_t init_state)
+{
+	this->din_ch = din_ch;
+	
+	if(act_lvl) this->act_lvl = board::DIN_HIGH;
+	else this->act_lvl = board::DIN_LOW;
+	
+	this->dbnc_cnter = 0;
+	this->dbnc_lim = dbnc_lim;
+	
+	if(init_state) this->state = BUTTON_ON;
+	else this->state = BUTTON_OFF;
+	
+	this->time = 0;
+	this->is_new = 0;
+}
+
+hw::Button::~Button(void)
+{
+	return;
+}
+
+uint8_t hw::Button::read(void)
+{
+	// Read din level
+	uint8_t lvl = this->din_ch->read();
+	
+	// Increase state counter
+	this->time = util::sat_add(this->time, 1);
+	
+	// Determine next state
+	uint8_t next_state = BUTTON_OFF;
+	if(lvl==this->act_lvl) next_state = BUTTON_ON;
+	
+	// Advance debounce sample counter
+	if(next_state != this->state) this->dbnc_cnter++;
+	else this->dbnc_cnter = 0;
+	
+	// Check for debounce end
+	if(this->dbnc_cnter < this->dbnc_lim) return this->state;
+	
+	// Debounce end. Apply new state.
+	this->state = next_state;
+	this->time = 0;
+	this->is_new = 1;
+	this->dbnc_cnter = 0;
+	
+	return this->state;
+}
+
+uint8_t hw::Button::force_read(void)
+{
+	// Read din level
+	uint8_t lvl = this->din_ch->read();
+	
+	// Cancels active debounce
+	this->dbnc_cnter = 0;
+	
+	// Determine next state
+	uint8_t next_state = BUTTON_OFF;
+	if(lvl==this->act_lvl) next_state = BUTTON_ON;
+	
+	if(next_state != this->state)
+	{
+		this->state = next_state;
+		this->time = 0;
+		this->is_new = 1;
+	};
+	
+	return this->state;
+}
+
+/**** Private function definitions ****/
diff --git a/firmware/src/hw/button.h b/firmware/src/hw/button.h
new file mode 100644
index 0000000..8c7b87e
--- /dev/null
+++ b/firmware/src/hw/button.h
@@ -0,0 +1,41 @@
+#ifndef BUTTON_H_
+#define BUTTON_H_
+
+/**** Includes ****/
+#include <stdint.h>
+#include "../board/din.h"
+
+namespace hw {
+
+/**** Public definitions ****/
+const uint8_t BUTTON_OFF  = 0;
+const uint8_t BUTTON_ON = 1;
+
+class Button
+{
+	protected:
+	board::DigitalIn* din_ch;
+	uint8_t act_lvl;
+	uint8_t dbnc_cnter;
+	
+	public:
+	Button(board::DigitalIn* din_ch, uint8_t act_lvl, uint8_t dbnc_lim, uint8_t init_state);
+	~Button(void);
+	
+	uint8_t state;
+	uint16_t time;
+	uint8_t dbnc_lim;
+	uint8_t is_new;
+	
+	uint8_t read(void);
+	uint8_t force_read(void);
+};
+
+/**** Public function declarations ****/
+
+#ifdef TESTING
+#endif
+
+} //namespace
+
+#endif /* BUTTON_H_ */
\ No newline at end of file