Adding beginner's example on using PD15 in OrangePi 3

examples/pd15.c

@@ -0,0 +1,63 @@
+#include <wiringPi.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+
+#if 0
+ +------+-----+----------+------+---+ OPi 3 +---+------+----------+-----+------+
+ | GPIO | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | GPIO |
+ +------+-----+----------+------+---+----++----+---+------+----------+-----+------+
+ | | | 3.3V | | | 1 || 2 | | | 5V | | |
+ | 122 | 0 | SDA.0 | OFF | 0 | 3 || 4 | | | 5V | | |
+ | 121 | 1 | SCL.0 | OFF | 0 | 5 || 6 | | | GND | | |
+ | 118 | 2 | PWM.0 | OFF | 0 | 7 || 8 | 0 | OFF | PL02 | 3 | 354 |
+ | | | GND | | | 9 || 10 | 0 | OFF | PL03 | 4 | 355 |
+ | 120 | 5 | RXD.3 | ALT4 | 0 | 11 || 12 | 0 | OFF | PD18 | 6 | 114 |
+ | 119 | 7 | TXD.3 | ALT4 | 0 | 13 || 14 | | | GND | | |
+ | 362 | 8 | PL10 | OFF | 0 | 15 || 16 | 0 | OFF | PD15 | 9 | 111 |
+ | | | 3.3V | | | 17 || 18 | 0 | OFF | PD16 | 10 | 112 |
+ | 229 | 11 | MOSI.1 | ALT2 | 0 | 19 || 20 | | | GND | | |
+ | 230 | 12 | MISO.1 | ALT2 | 0 | 21 || 22 | 0 | OFF | PD21 | 13 | 117 |
+ | 228 | 14 | SCLK.1 | ALT2 | 0 | 23 || 24 | 0 | ALT2 | CE.1 | 15 | 227 |
+ | | | GND | | | 25 || 26 | 0 | OFF | PL08 | 16 | 360 |
+ +------+-----+----------+------+---+----++----+---+------+----------+-----+------+
+ | GPIO | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | GPIO |
+ +------+-----+----------+------+---+ OPi 3 +---+------+----------+-----+------+
+#endif
+
+#define PD15_PIN 9
+
+static void usage(const char* argv0)
+{
+ printf("Usage: %s <on|off>\n", argv0);
+ exit(1);
+}
+
+int main(int argc, char* argv[])
+{
+ printf ("OrangePi Pi wiringPi PD15 test program\n");
+
+ if (argc != 2) usage(argv[0]);
+
+ int mode = 0;
+ if (!strcmp(argv[1], "on"))
+ mode = HIGH;
+ else if (!strcmp(argv[1], "off"))
+ mode = LOW;
+ else
+ usage(argv[0]);
+
+ if (wiringPiSetup() == -1)
+ {
+ fprintf(stderr, "Error setting up wiringPi\n");
+ return -1;
+ }
+
+ pinMode(PD15_PIN, OUTPUT);
+ digitalWrite(PD15_PIN, mode);
+
+ return 0;
+}
+