Add DS1990A example sketch

Author: mikaelpatel

README.md

@@ -11,4 +11,5 @@ The OWI library has been developed to support the implementation of
 ## Example Sketches
 
 * [DS18B20](./examples/DS18B20)
+* [DS1990A](./examples/DS1990A)
 * [Scanner](./examples/Scanner)

examples/DS1990A/DS1990A.ino

@@ -0,0 +1,48 @@
+#include "OWI.h"
+#include "GPIO.h"
+#include "Software/OWI.h"
+
+// Table with valid keys (64 bit 1-Wire rom code, 8 bytes per entry)
+const uint8_t KEY[] PROGMEM = {
+ 0x01, 0x23, 0x81, 0xa3, 0x09, 0x00, 0x00, 0x7b,
+ 0x01, 0x29, 0x01, 0x27, 0x09, 0x00, 0x00, 0xa8,
+ 0x01, 0x26, 0xd9, 0x3e, 0x09, 0x00, 0x00, 0x47
+};
+
+// One-Wire bus manager
+Software::OWI<BOARD::D7> owi;
+
+// Use built-in LED to signal
+GPIO<BOARD::D13> led;
+
+void setup()
+{
+ led.output();
+ led = LOW;
+}
+
+void loop()
+{
+ // Attempt to read key every seconds
+ uint8_t rom[owi.ROM_MAX] = { 0 };
+ delay(1000);
+ if (!owi.read_rom(rom)) return;
+
+ // Check if it is an authorized key. One long blink if found
+ for (uint8_t i = 0; i < sizeof(KEY); i += OWI::ROM_MAX) {
+ if (!memcmp_P(rom, &KEY[i], owi.ROM_MAX)) {
+ led = HIGH;
+ delay(1000);
+ led = LOW;
+ return;
+ }
+ }
+
+ // Three short blinks if not found
+ for (uint8_t i = 0; i < 3; i++) {
+ delay(250);
+ led = HIGH;
+ delay(250);
+ led = LOW;
+ }
+}