adding half of radiocounttoleds

Simple test allows a user to test the rpi/cc2520 against the common
radiocounttoleds app.

tests/radio_count_to_leds.c

@@ -0,0 +1,51 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include "ioctl.h"
+#include <unistd.h>
+
+int main(char ** argv, int argc)
+{
+
+	int result = 0;
+	printf("Testing cc2520 driver...\n");
+	int file_desc;
+	file_desc = open("/dev/radio", O_RDWR);
+
+	printf("Setting channel\n");
+	struct cc2520_set_channel_data chan_data;
+	chan_data.channel = 24;
+	ioctl(file_desc, CC2520_IO_RADIO_SET_CHANNEL, &chan_data);
+
+	printf("Setting address\n");
+	struct cc2520_set_address_data addr_data;
+	addr_data.short_addr = 0x0001;
+	addr_data.extended_addr = 0x0000000000000001;
+	addr_data.pan_id = 0x22;
+	ioctl(file_desc, CC2520_IO_RADIO_SET_ADDRESS, &addr_data);
+
+	printf("Setting tx power\n");
+	struct cc2520_set_txpower_data txpower_data;
+	txpower_data.txpower = CC2520_TXPOWER_0DBM;
+	ioctl(file_desc, CC2520_IO_RADIO_SET_TXPOWER, &txpower_data);
+
+	printf("Turning on the radio...\n");
+	ioctl(file_desc, CC2520_IO_RADIO_INIT, NULL);
+	ioctl(file_desc, CC2520_IO_RADIO_ON, NULL);
+
+	uint16_t i = 0;
+
+	while (1) {
+		printf("Sending RCTL packet.\n");
+		// 8 Byte Header, 6 Byte Payload.
+		char test_msg[] = {0x0D, 0x41, 0x88, (char) i, 0x22, 0xFF, 0xFF, 0x00, 0x01, 0x06, (char) (i >> 8), (char) (i & 0xFF)};
+		result = write(file_desc, test_msg, 12);
+		usleep(250 * 1000);
+	}
+
+	printf("Turning off the radio...\n");
+	ioctl(file_desc, CC2520_IO_RADIO_OFF, NULL);
+
+	close(file_desc);
+}