From: vl_garistov <vl_garistov@gmail.com>
Date: Wed, 24 Mar 2021 08:59:08 +0000 (+0200)
Subject: added a second I2C example, with interrupt
X-Git-Url: https://kolegite.com/gitweb/?a=commitdiff_plain;h=2fe1af4ad1252cdcffbb28709fc94ba43da58aec;p=vmks.git

added a second I2C example, with interrupt
---

diff --git a/Examples/I2C_interrupt_to_master/I2C_interrupt_to_master.png b/Examples/I2C_interrupt_to_master/I2C_interrupt_to_master.png
new file mode 100644
index 0000000..41c47c8
Binary files /dev/null and b/Examples/I2C_interrupt_to_master/I2C_interrupt_to_master.png differ
diff --git a/Examples/I2C_interrupt_to_master/I2C_interrupt_to_master_master/I2C_interrupt_to_master_master.ino b/Examples/I2C_interrupt_to_master/I2C_interrupt_to_master_master/I2C_interrupt_to_master_master.ino
new file mode 100644
index 0000000..47b5705
--- /dev/null
+++ b/Examples/I2C_interrupt_to_master/I2C_interrupt_to_master_master/I2C_interrupt_to_master_master.ino
@@ -0,0 +1,62 @@
+#include <Wire.h>
+
+#define INT_PIN	2
+
+#define SLAVE_ADDRESS	0x09
+
+size_t i2c_write(uint8_t address, void *data, size_t size);
+size_t i2c_read(uint8_t address, void *data, size_t size);
+void slave_interrupt(void);
+
+volatile bool new_data = false;
+
+void setup()
+{
+	Wire.begin();
+	Serial.begin(9600);
+	attachInterrupt(digitalPinToInterrupt(INT_PIN), slave_interrupt, RISING);
+}
+
+void loop()
+{
+	uint8_t dip_sw;
+
+	if (new_data)
+	{
+		i2c_read(SLAVE_ADDRESS, &dip_sw, sizeof(dip_sw));
+		Serial.println(dip_sw);
+		new_data = false;
+	}
+}
+
+size_t i2c_write(uint8_t address, void *data, size_t size)
+{	
+	int error_code;
+	size_t bytes_written;
+
+	Wire.beginTransmission(address);
+	bytes_written = Wire.write((uint8_t *) data, size);
+	error_code =  Wire.endTransmission();
+
+	return error_code ? 0: bytes_written;
+}
+
+size_t i2c_read(uint8_t address, void *data, size_t size)
+{
+	size_t bytes_received = Wire.requestFrom(address, size);
+
+	if (bytes_received == size)
+	{
+		for (size_t i = 0; i < size; i++)
+		{
+			((uint8_t *) data)[i] = Wire.read();
+		}
+	}
+	
+	return bytes_received;
+}
+
+void slave_interrupt(void)
+{
+	new_data = true;
+}
\ No newline at end of file
diff --git a/Examples/I2C_interrupt_to_master/I2C_interrupt_to_master_slave/I2C_interrupt_to_master_slave.ino b/Examples/I2C_interrupt_to_master/I2C_interrupt_to_master_slave/I2C_interrupt_to_master_slave.ino
new file mode 100644
index 0000000..4beb9d5
--- /dev/null
+++ b/Examples/I2C_interrupt_to_master/I2C_interrupt_to_master_slave/I2C_interrupt_to_master_slave.ino
@@ -0,0 +1,61 @@
+#include <Wire.h>
+
+#define MASTER_INT_PIN	A2
+#define INT_PIN	3
+#define SW0_PIN	7
+#define SW1_PIN	6
+#define SW2_PIN	5
+#define SW3_PIN	4
+
+#define SLAVE_ADDRESS	0x09
+
+void i2c_send_handler(void);
+void button_handler(void);
+
+volatile uint8_t dip_sw = 0;
+volatile bool new_data = false;
+
+void setup()
+{
+	pinMode(MASTER_INT_PIN, OUTPUT);
+	digitalWrite(MASTER_INT_PIN, LOW);
+	pinMode(INT_PIN, INPUT_PULLUP);
+	pinMode(SW0_PIN, INPUT_PULLUP);
+	pinMode(SW1_PIN, INPUT_PULLUP);
+	pinMode(SW2_PIN, INPUT_PULLUP);
+	pinMode(SW3_PIN, INPUT_PULLUP);
+
+	attachInterrupt(digitalPinToInterrupt(INT_PIN), button_handler, FALLING);
+
+	Wire.begin(SLAVE_ADDRESS);
+	Wire.onRequest(i2c_send_handler);
+
+	Serial.begin(9600);
+}
+
+void loop()
+{
+	uint8_t tmp = digitalRead(SW0_PIN) |
+				 (digitalRead(SW1_PIN) << 1) |
+				 (digitalRead(SW2_PIN) << 2) |
+				 (digitalRead(SW3_PIN) << 3);
+	dip_sw = tmp;
+	if (new_data)
+	{
+		new_data = false;
+		digitalWrite(MASTER_INT_PIN, HIGH);
+		delayMicroseconds(5);
+		digitalWrite(MASTER_INT_PIN, LOW);
+		delayMicroseconds(5);
+	}
+}
+
+void i2c_send_handler(void)
+{
+	Wire.write((uint8_t *) &dip_sw, sizeof(dip_sw));
+}
+
+void button_handler(void)
+{
+	new_data = true;
+}