Add mqtt-to-dmx app for ATMega2560 (and possibly, later, others)

3 files changed, 133 insertions, 0 deletions

diff --git a/src/app/mqtt-to-dmx/Kconfig b/src/app/mqtt-to-dmx/Kconfig
new file mode 100644
index 0000000..80a42a2
--- /dev/null
+++ b/src/app/mqtt-to-dmx/Kconfig
@@ -0,0 +1,11 @@
+# Copyright 2024 Birte Kristina Friesel
+#
+# SPDX-License-Identifier: CC0-1.0
+
+prompt "MQTT to DMX gateway via ESP8266-01"
+depends on !loop && !wakeup && meta_driver_dmx && (meta_driver_stdin1 || meta_driver_stdin2 || meta_driver_stdin3) && meta_driver_timer
+help
+  MQTT to DMX gateway based upon an ESP8266 MQTT to UART bridge and a MAX485.
+  Connect ESP8266 TX to UART1/2/3 RX and enable the corresponding stdin and stdout drivers, configured to 115200 Baud.
+  Connect UART1/2/3 TX to MAX485 DI and enable the corresponding DMX driver.
+  Do not use the same UART for stdin and DMX.
diff --git a/src/app/mqtt-to-dmx/Makefile.inc b/src/app/mqtt-to-dmx/Makefile.inc
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/src/app/mqtt-to-dmx/Makefile.inc
diff --git a/src/app/mqtt-to-dmx/main.cc b/src/app/mqtt-to-dmx/main.cc
new file mode 100644
index 0000000..6eb6e0d
--- /dev/null
+++ b/src/app/mqtt-to-dmx/main.cc
@@ -0,0 +1,122 @@
+/*
+ * Copyright 2024 Birte Kristina Friesel
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+#include "arch.h"
+#include "driver/gpio.h"
+#include "driver/stdout.h"
+#include "driver/uptime.h"
+
+#if defined(CONFIG_meta_driver_stdin1)
+#include "driver/stdout1.h"
+#include "driver/stdin1.h"
+#define koutx kout1
+#define kin kin1
+#elif defined(CONFIG_meta_driver_stdin2)
+#include "driver/stdout2.h"
+#include "driver/stdin2.h"
+#define koutx kout2
+#define kin kin2
+#elif defined(CONFIG_meta_driver_stdin3)
+#include "driver/stdout3.h"
+#include "driver/stdin3.h"
+#define koutx kout3
+#define kin kin3
+#else
+#error "No stdin driver found"
+#endif
+
+#if defined(CONFIG_meta_driver_dmx1)
+#include "driver/dmx1.h"
+#define dmx dmx1
+#elif defined(CONFIG_meta_driver_dmx2)
+#include "driver/dmx2.h"
+#define dmx dmx2
+#elif defined(CONFIG_meta_driver_dmx3)
+#include "driver/dmx3.h"
+#define dmx dmx3
+#else
+#error "No DMX driver found"
+#endif
+
+#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;
+	/*
+	 * The first DMX frame is always 0.  However, incoming UART messages from
+	 * the ESP8266 start with " " after the "RX:" part has been removed. So,
+	 * the first actual message will end up in dmx.frames[1] as intended.
+	 */
+	unsigned char dmx_frame = 0;
+	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();
+	koutx.setup();
+	kin.setup();
+
+	for (unsigned char i = 0; i < dmx.num_frames; 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 < sizeof(buffer))) {
+				char key = kin.getKey();
+				kout << key << flush;
+
+				/*
+				 * Whoever decided that it was a good idea to prefix MQTT messages with "RX: " when outputting them on UART?
+				 * Oh right, that was yesterday-me.
+				 */
+				if ((key == 'R') || (key == 'X') || (key == ':')) {
+					continue;
+				}
+
+				buffer[buf_pos++] = key;
+
+				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);
+
+		gpio.led_toggle(0);
+		dmx.write();
+	}
+
+	return 0;
+}
+
+ON_TIMER_INTERRUPT_head
+	timer_done = 1;
+ON_TIMER_INTERRUPT_tail