Berry Serial `config` to change parity on-the-fly for RS-485 (#22285)

CHANGELOG.md

@@ -10,6 +10,7 @@ All notable changes to this project will be documented in this file.
 - HASPmota `cpicker` and `msgbox` (#22244)
 - Support for DALI on ESP8266
 - Command ``DaliWeb 1`` to enable light control for DALI broadcast address
+- Berry Serial `config` to change parity on-the-fly for RS-485
 
 ### Breaking Changed
 

lib/default/TasmotaSerial-3.6.0/src/TasmotaSerial.cpp

@@ -476,6 +476,42 @@ size_t TasmotaSerial::write(uint8_t b) {
   return size;
 }
 
+#ifdef ESP32
+// Add ability to change parity on the fly, for RS-485
+// See https://github.com/arendst/Tasmota/discussions/22272
+int32_t TasmotaSerial::setConfig(uint32_t config) {
+
+  uint32_t data_bits_before = (m_config & 0xc) >> 2;
+  uint32_t parity_before = m_config & 0x3;
+  uint32_t stop_bits_before = (m_config & 0x30) >> 4;
+
+  uint32_t data_bits = (config & 0xc) >> 2;
+  uint32_t parity = config & 0x3;
+  uint32_t stop_bits = (config & 0x30) >> 4;
+
+  esp_err_t err;
+
+  if (data_bits_before != data_bits) {
+    if (err = uart_set_word_length(m_uart, (uart_word_length_t) data_bits)) {
+      return (int32_t) err;
+    }
+  }
+  if (parity_before != parity) {
+    if (err = uart_set_parity(m_uart, (uart_parity_t) parity)) {
+      return (int32_t) err;
+    }
+  }
+  if (stop_bits_before != stop_bits) {
+    if (err = uart_set_stop_bits(m_uart, (uart_stop_bits_t) stop_bits)) {
+      return (int32_t) err;
+    }
+  }
+
+  m_config = config;
+  return 0;   // no error
+}
+#endif
+
 #ifdef ESP8266
 void IRAM_ATTR TasmotaSerial::rxRead(void) {
   if (!m_nwmode) {

lib/default/TasmotaSerial-3.6.0/src/TasmotaSerial.h

@@ -72,6 +72,7 @@ class TasmotaSerial : public Stream {
 #ifdef ESP32
     uint32_t getUart(void) const { return m_uart; }
     HardwareSerial *getesp32hws(void) { return TSerial; }
+    int32_t setConfig(uint32_t config);
 #endif
     bool isValid(void) { return m_valid; }
     bool overflow(void);

lib/libesp32/berry_tasmota/src/be_serial_lib.c

@@ -10,6 +10,7 @@
 
 extern int b_serial_init(bvm *vm);
 extern int b_config_tx_en(bvm *vm);
+extern int b_serial_config(bvm *vm);
 extern int b_serial_deinit(bvm *vm);
 
 extern int b_serial_write(bvm *vm);
@@ -92,5 +93,6 @@ class be_class_serial (scope: global, name: serial) {
     read, func(b_serial_read)
     available, func(b_serial_available)
     flush, func(b_serial_flush)
+    config, func(b_serial_config)
 }
 @const_object_info_end */

tasmota/tasmota_xdrv_driver/xdrv_52_3_berry_serial.ino

@@ -86,6 +86,21 @@ extern "C" {
     be_return_nil(vm);
   }
 
+  // Berry: `config(config:int) -> nil or exception`
+  int32_t b_serial_config(struct bvm *vm);
+  int32_t b_serial_config(struct bvm *vm) {
+    be_getmember(vm, 1, ".p");
+    TasmotaSerial * ser = (TasmotaSerial *) be_tocomptr(vm, -1);
+    if (ser) {
+      uint32_t config = be_toint(vm, 2);
+      int32_t err = ser->setConfig(config);
+      if (err) {
+        be_raisef(vm, "internal_error", "Unable to set serial config err %d", err);
+      }
+    }
+    be_return_nil(vm);
+  }
+
   // Berry: `deinit(void)`
   int32_t b_serial_deinit(struct bvm *vm);
   int32_t b_serial_deinit(struct bvm *vm) {