Add UART→DMX app

src/app/uart-to-dmx/Kconfig

+# Copyright 2020 Daniel Friesel
+#
+# SPDX-License-Identifier: CC0-1.0
+
+prompt "UART to DMX gateway"
+depends on !loop && !wakeup && meta_driver_dmx && meta_driver_stdin && meta_driver_timer

src/app/uart-to-dmx/Makefile.inc

+# vim:ft=make
+#
+# Copyright 2020 Daniel Friesel
+#
+# SPDX-License-Identifier: CC0-1.0
+
+ifdef app
+	loop = 1
+endif

src/app/uart-to-dmx/main.cc

+/*
+ * Copyright 2022 Daniel Friesel
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+#include "arch.h"
+#include "driver/gpio.h"
+#include "driver/stdout.h"
+#include "driver/stdin.h"
+#include "driver/uptime.h"
+#include "driver/dmx.h"
+
+#include "driver/timer.h"
+volatile unsigned char timer_done = 0;
+char buffer[24];
+unsigned char buf_pos = 0;
+
+void input_to_dmx(void)
+{
+	unsigned char num = 0;
+	unsigned char dmx_frame = 1;
+	for (unsigned int i = 0; i < buf_pos; i++) {
+		if ((buffer[i] >= '0') && (buffer[i] <= '9')) {
+			num *= 10;
+			num += buffer[i] - '0';
+		}
+		else {
+			dmx.frames[dmx_frame++] = num;
+			num = 0;
+		}
+	}
+}
+
+int main(void)
+{
+	arch.setup();
+	gpio.setup();
+	kout.setup();
+	kin.setup();
+
+	for (unsigned char i = 0; i < 16; i++) {
+		dmx.frames[i] = 0;
+	}
+
+	dmx.setup();
+	timer.setup_hz(15);
+	timer.start(1);
+
+	while (1) {
+		while (!timer_done) {
+			arch.idle();
+			while (kin.hasKey() && (buf_pos < 24)) {
+				char key = kin.getKey();
+				buffer[buf_pos++] = key;
+				kout << key << flush;
+
+				if ((key == '\n') || (key == '\r')) {
+					input_to_dmx();
+					kout << endl << "DMX: " << dmx.frames[1] << " " << dmx.frames[2] << " " << dmx.frames[3] << " " << dmx.frames[4] << endl << "> ";
+					buf_pos = 0;
+				}
+			}
+		}
+		timer.stop();
+		timer_done = 0;
+		timer.start(1);
+
+		dmx.write();
+	}
+
+	return 0;
+}
+
+ON_TIMER_INTERRUPT_head
+	timer_done = 1;
+ON_TIMER_INTERRUPT_tail