Add methods to set serial parameters and control lines in UsbSerialPort

Signed-off-by: Tony <tonylu@tony-cloud.com>
2026-06-28 06:36:09 +08:00
parent 1638a5c388
commit 2d7fc43ea2
2 changed files with 127 additions and 0 deletions
@@ -131,6 +131,10 @@ class FlutterUsbSerialPlugin :
            "requestPermission" -> requestPermission(call, result)
            "openPort" -> openPort(call, result)
            "write" -> write(call, result)
+            "setParameters" -> setParameters(call, result)
+            "setDTR" -> setDtr(call, result)
+            "setRTS" -> setRts(call, result)
+            "purgeHwBuffers" -> purgeHwBuffers(call, result)
            "close" -> closePort(call, result)
            else -> result.notImplemented()
        }
@@ -272,6 +276,85 @@ class FlutterUsbSerialPlugin :
        }
    }

+    private fun setParameters(call: MethodCall, result: Result) {
+        val portId = call.argument<Int>("portId") ?: run {
+            result.error("INVALID_ARGUMENT", "portId required", null)
+            return
+        }
+        val baudRate = call.argument<Int>("baudRate") ?: 9600
+        val dataBits = call.argument<Int>("dataBits") ?: 8
+        val parity = call.argument<Int>("parity") ?: UsbSerialPort.PARITY_NONE
+        val stopBits = call.argument<Int>("stopBits") ?: UsbSerialPort.STOPBITS_1
+        val handle = synchronized(portsLock) { openPorts[portId] }
+        if (handle == null) {
+            result.error("PORT_NOT_FOUND", "Port $portId is not open", null)
+            return
+        }
+        try {
+            handle.port.setParameters(baudRate, dataBits, stopBits, parity)
+            result.success(null)
+        } catch (e: Exception) {
+            result.error("SET_PARAMETERS_FAILED", e.message, null)
+        }
+    }
+
+    private fun setDtr(call: MethodCall, result: Result) {
+        setControlLine(call, result, "DTR") { port, value -> port.setDTR(value) }
+    }
+
+    private fun setRts(call: MethodCall, result: Result) {
+        setControlLine(call, result, "RTS") { port, value -> port.setRTS(value) }
+    }
+
+    private fun setControlLine(
+        call: MethodCall,
+        result: Result,
+        name: String,
+        setter: (UsbSerialPort, Boolean) -> Unit,
+    ) {
+        val portId = call.argument<Int>("portId") ?: run {
+            result.error("INVALID_ARGUMENT", "portId required", null)
+            return
+        }
+        val value = call.argument<Boolean>("value") ?: run {
+            result.error("INVALID_ARGUMENT", "value required", null)
+            return
+        }
+        val handle = synchronized(portsLock) { openPorts[portId] }
+        if (handle == null) {
+            result.error("PORT_NOT_FOUND", "Port $portId is not open", null)
+            return
+        }
+        try {
+            setter(handle.port, value)
+            result.success(null)
+        } catch (e: Exception) {
+            result.error("SET_${name}_FAILED", e.message, null)
+        }
+    }
+
+    private fun purgeHwBuffers(call: MethodCall, result: Result) {
+        val portId = call.argument<Int>("portId") ?: run {
+            result.error("INVALID_ARGUMENT", "portId required", null)
+            return
+        }
+        val purgeWriteBuffers = call.argument<Boolean>("purgeWriteBuffers") ?: true
+        val purgeReadBuffers = call.argument<Boolean>("purgeReadBuffers") ?: true
+        val handle = synchronized(portsLock) { openPorts[portId] }
+        if (handle == null) {
+            result.error("PORT_NOT_FOUND", "Port $portId is not open", null)
+            return
+        }
+        try {
+            handle.port.purgeHwBuffers(purgeWriteBuffers, purgeReadBuffers)
+            result.success(null)
+        } catch (e: UnsupportedOperationException) {
+            result.success(null)
+        } catch (e: Exception) {
+            result.error("PURGE_FAILED", e.message, null)
+        }
+    }
+
    private fun closePort(call: MethodCall, result: Result) {
        val portId = call.argument<Int>("portId") ?: run {
            result.error("INVALID_ARGUMENT", "portId required", null)