BH1792: Add examples for all languages

- Examples for C/C++/Python/Java/JavaScript
- Add build line for java BH1792_Example

Signed-off-by: Assam Boudjelthia <assam.boudjelthia@fi.rohmeurope.com>
Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>

examples/c/bh1792.c

@@ -0,0 +1,86 @@
+/*
+* The MIT License (MIT)
+*
+* Author: Assam Boudjelthia
+* Copyright (c) 2018 Rohm Semiconductor.
+*
+* Permission is hereby granted, free of charge, to any person obtaining a copy of
+* this software and associated documentation files (the "Software"), to deal in
+* the Software without restriction, including without limitation the rights to
+* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+* the Software, and to permit persons to whom the Software is furnished to do so,
+* subject to the following conditions:
+*
+* The above copyright notice and this permission notice shall be included in all
+* copies or substantial portions of the Software.
+*
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+#include <stdio.h>
+#include <signal.h>
+#include "bh1792.h"
+#include  <sys/time.h>
+#include "upm_utilities.h"
+
+bool isStopped;
+#define SENSOR_ADDR 0x5b
+#define I2C_BUS 0
+
+void signal_int_handler(int signo)
+{
+    if (signo == SIGINT)
+        isStopped = true;
+}
+
+void print_data(void *args)
+{
+	bh1792_context dev = (bh1792_context)args;
+	uint16_t led_on[32], led_off[32];
+	struct timespec now;
+
+	clock_gettime(CLOCK_MONOTONIC_RAW, &now);
+
+	if(bh1792_get_fifo_data(dev, led_off, led_on) == UPM_SUCCESS) {
+		printf("\nFIFO data:\n");
+		for(int i = 0; i < 32; i++)
+			printf("%d: off: %d, on: %d\n", i, led_off[i], led_on[i]);
+			
+		printf("timestamp %ld sec, %ld nsec\n", now.tv_sec, now.tv_nsec);
+	}
+}
+
+int main(int argc, char **argv)
+{
+	float meas_time;
+
+	signal(SIGINT, signal_int_handler);
+
+	bh1792_context dev = bh1792_init(I2C_BUS, SENSOR_ADDR);
+	if (!dev) {
+        printf("bh1792_init() failed.\n");
+        return -1;
+    }
+
+	printf("Software reset\n");
+	bh1792_soft_reset(dev);
+
+	bh1792_enable_sync_mode(dev, 256, 32);
+	bh1792_install_isr(dev, MRAA_GPIO_EDGE_FALLING, 33, &print_data, dev);
+	bh1792_get_meas_time_ms(dev, &meas_time);
+	bh1792_start_measurement(dev);
+
+	printf("Heart beat sensor data\n");
+
+	while(!isStopped) {
+		usleep(meas_time * 1000);
+	}
+
+	bh1792_close(dev);
+	return 0;
+}