From 2ecf97e382b4aff25bb97ea730a0c36d08747998 Mon Sep 17 00:00:00 2001
From: cheapie <no-email-for-you@example.com>
Date: Mon, 25 May 2026 14:01:06 -0500
Subject: Add big-endian railroad crossing sample and big-endian versions of
 libraries

---
 c/rrxing-be/rrxing.c | 86 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 86 insertions(+)
 create mode 100644 c/rrxing-be/rrxing.c

(limited to 'c/rrxing-be/rrxing.c')

diff --git a/c/rrxing-be/rrxing.c b/c/rrxing-be/rrxing.c
new file mode 100644
index 0000000..e867e8a
--- /dev/null
+++ b/c/rrxing-be/rrxing.c
@@ -0,0 +1,86 @@
+#include <stdint.h>
+#include <stdbool.h>
+#include "rvcontroller-ecalls.h"
+
+bool streq(char *a, char *b) {
+	for (int i=0;a[i] != 0 || b[i] != 0;i++) {
+		if (a[i] != b[i]) {
+			return false;
+		}
+	}
+	return true;
+}
+
+void sleep(uint32_t delay) {
+	//This will start having problems after about 130 years
+	//of uptime, but that's probably acceptable
+	uint32_t endtime = rdtime() + delay;
+	while (rdtime() < endtime) {}
+	return;
+}
+
+bool checkdetector(void) {
+	char channelbuf[16];
+	char msgbuf[16];
+	while (digiline_bufferlevel() > 0) {
+		lightweight_mode(0);
+		digiline_receive(channelbuf,16,msgbuf,16);
+		if (streq(channelbuf,"detect")) {
+			return true;
+		}
+	}
+	lightweight_mode(1);
+	return false;
+}
+
+void main() {
+	printstr("Railroad Crossing\nfor RVController\nInitializing HW\n");
+	digiline_send("light","OFF");
+	digiline_send("bell","off");
+	digiline_send("gate","up");
+	digiline_clearbuffer();
+	while (true) {
+		printstr("Idle\n");
+		lightweight_mode(1);
+		printstr("Lightweight: On\n");
+		while (!checkdetector()) {}
+		printstr("Train detected\nLightweight: Off\n");
+		lightweight_mode(0);
+		digiline_send("light","YELLOW");
+		printstr("Light: Yellow\n");
+		sleep(2);
+		digiline_send("bell","on");
+		printstr("Bell: On\n");
+		sleep(2);
+		digiline_send("light","RED");
+		printstr("Light: Red\n");
+		sleep(3);
+		digiline_send("gate","down");
+		printstr("Gate: Down\n");
+		sleep(4);
+		digiline_send("bell","off");
+		printstr("Bell: Off\n");
+
+		digiline_clearbuffer();
+		for (uint8_t time = 15;time > 0;time--) {
+			printstr("Timeout in ");
+			printint(time);
+			printstr("s\n");
+			sleep(1);
+			bool train = checkdetector();
+			lightweight_mode(0); //checkdetector() turns this on
+			if (train) {
+				digiline_clearbuffer();
+				time = 25;
+				printstr("Time reset by train\n");
+			}
+		}
+		printstr("Timed out\n");
+
+		digiline_send("gate","up");
+		printstr("Gate: Up\n");
+		sleep(2);
+		digiline_send("light","OFF");
+		printstr("Light: Off\n");
+	}
+}
-- 
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