"Serial1.on('data', function (data) {......" not works for me, is works for any other ??

@Frida: Thanks for testing and sharing your results

I try to catch up:

• First the there is a initial setting of the values

• Next is saving some object into a jsvConfigObject configs[]

List of addresses of JshUSARTInfo

   br:  0x3ffff970
   rx:  0x3ffff974
   tx:  0x3ffff975
   ck:  0x3ffff976
   cts: 0x3ffff977
   bs:  0x3ffff978
   pa:  0x3ffff979
   sb:  0x3ffff97a
   xx:  0x3ffff97b
   eh:  0x3ffff97c

Now I am testing with some if defs in src/jsutils.h

// # if defined(ESP8266)
// [#define](https://forum.espruino.com/search/?q=%23define) PACKED_FLAGS_MAYBE  __attribute__ ((__aligned__(16)))   
// [#else](https://forum.espruino.com/search/?q=%23else)
// [#define](https://forum.espruino.com/search/?q=%23define) PACKED_FLAGS_MAYBE __attribute__ ((__packed__))
// [#endif](https://forum.espruino.com/search/?q=%23endif)

@Gordon is this how you would thought to use PACKED_FLAGS_MAYBE

and use this flag for jshUSARTSetup

/// Settings passed to jshUSARTSetup to set it the USART up
typedef struct {
  int baudRate;            /// FIXME uint32_t ???
  Pin pinRX;
  Pin pinTX;
  Pin pinCK;               ///< Clock, or PIN_UNDEFINED
  Pin pinCTS;              ///< Clear to send, or PIN_UNDEFINED
  unsigned char bytesize;  ///< size of byte, 7 or 8
  unsigned char parity;    ///< 0=none, 1=odd, 2=even
  unsigned char stopbits;  ///< 1 or 2
  bool xOnXOff;            ///< XON XOFF flow control?
  bool errorHandling;      ///< Whether to forward parity/framing errors
} PACKED_FLAGS_MAYBE JshUSARTInfo;