add working with pseudo-FX3U with my firmware

BTA_dome_modbus/io.h

@@ -0,0 +1,38 @@
+/*
+ * This file is part of the sslsosk project.
+ * Copyright 2026 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <modbus/modbus.h>
+
+#define NRELAYS     16
+#define NINPUTS     16
+#define NADCCHNLS   8
+// ADC level threshold: 50 units
+#define ADCTHRESH   50
+
+void io_set_ctx(modbus_t *ctx);
+void io_process();
+
+int io_read_inputs(char inputs[NINPUTS]);
+int io_read_adc(int nch, uint16_t *val);
+void io_read_relays(char relays[NRELAYS]);
+
+int io_relay_on(int N);
+int io_relay_off(int N);
+int io_set_relays(int N);