From 2f5dadf484daf6a37a515c9fbfc11b9045b5f82c Mon Sep 17 00:00:00 2001
From: Vasil Zlatanov <v@skozl.com>
Date: Wed, 3 May 2017 23:18:54 +0100
Subject: Add interrupts for all inputs

---
 src/main.cpp | 70 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 src/main.cpp

diff --git a/src/main.cpp b/src/main.cpp
new file mode 100644
index 0000000..cf2214f
--- /dev/null
+++ b/src/main.cpp
@@ -0,0 +1,70 @@
+#include "mbed.h"
+#include "spi_init.h"
+#include "counter.h"
+#include "Adafruit_SSD1306.h"
+
+#define SW_PINS p22, p23, p24, p25
+#define SW_PERIOD 20000 // 20ms
+
+void tout(void);
+
+// Onboard LED 
+DigitalOut alive(LED1);
+
+PinName switch_pin[] = { SW_PINS };
+
+Counter *switch_position[4];
+Ticker  timer;
+
+volatile uint16_t switch_count[4] = { 0, 0, 0, 0 };
+volatile uint16_t update = 0;
+
+// Initialise display
+SPInit gSpi(D_MOSI_PIN, NC, D_CLK_PIN);	
+Adafruit_SSD1306_Spi oled(gSpi, D_DC_PIN, D_RST_PIN, D_CS_PIN, 64, 128);
+
+int main(void)
+{
+	// Enable ISR for the switch rising edge
+	for (int i = 0; i < 3; ++i) {
+		switch_position[i] = new Counter(switch_pin[i]);	
+	}
+
+	//Attach switch sampling timer ISR to the timer instance with the required period
+	timer.attach_us(&tout, SW_PERIOD);
+
+	oled.setRotation(2);
+	oled.printf("%ux%u OLED Display\r\n", oled.width(), oled.height());
+
+	for (;;) {
+		if (update) {
+			update = 0;
+
+			oled.setTextCursor(0, 0);
+
+			//Write the latest switch osciallor count
+			for (int i = 0; i < 3; ++i) {
+				oled.printf("\n%05u  ", switch_count[i]);
+			}
+
+			//Copy the display buffer to the display
+			oled.display();
+
+			alive = !alive;
+		}
+
+	}
+}
+
+
+//Interrupt Service Routine for the switch sampling timer
+void tout(void)
+{
+	// Query how many times switch triggered
+	for (int i = 0; i < 3; ++i) {
+		switch_count[i] = switch_position[i]->read();
+		switch_position[i]->write(0);
+	}
+	// Update display
+	update = 1;
+}
-- 
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