redstone RTU I/O

rtu/dev/redstone.lua

@@ -0,0 +1,88 @@
+-- #REQUIRES rtu.lua
+-- note: this RTU makes extensive use of the programming concept of closures
+
+function redstone_rtu()
+    local self = {
+        rtu = rtu_init()
+    }
+
+    local rtu_interface = function ()
+        return self.rtu
+    end
+
+    local link_di = function (side, color)
+        local f_read = nil
+
+        if color then
+            f_read = function ()
+                return rs.testBundledInput(side, color)
+            end
+        else
+            f_read = function ()
+                return rs.getInput(side)
+            end
+        end
+            
+        self.rtu.connect_di(f_read)
+    end
+
+    local link_do = function (side, color)
+        local f_read = nil
+        local f_write = nil
+
+        if color then
+            f_read = function ()
+                return colors.test(rs.getBundledOutput(side), color)
+            end
+
+            f_write = function (value)
+                local output = rs.getBundledOutput(side)
+
+                if value then
+                    colors.combine(output, value)
+                else
+                    colors.subtract(output, value)
+                end
+
+                rs.setBundledOutput(side, output)
+            end
+        else
+            f_read = function ()
+                return rs.getOutput(side)
+            end
+
+            f_write = function (value)
+                rs.setOutput(side, color)
+            end
+        end
+            
+        self.rtu.connect_coil(f_read, f_write)
+    end
+
+    local link_ai = function (side)
+        self.rtu.connect_input_reg(
+            function ()
+                return rs.getAnalogInput(side)
+            end
+        )
+    end
+
+    local link_ao = function (side)
+        self.rtu.connect_holding_reg(
+            function ()
+                return rs.getAnalogOutput(side)
+            end,
+            function (value)
+                rs.setAnalogOutput(side, value)
+            end
+        )
+    end
+
+    return {
+        rtu_interface = rtu_interface,
+        link_di = link_di,
+        link_do = link_do,
+        link_ai = link_ai,
+        link_ao = link_ao
+    }
+end