char

Comments

• Ariba Posts: 2,682

  2023-11-12 02:51

  Most objects call it tx() or out()
• JonnyMac Posts: 8,951

  2023-11-12 03:09

  That wasn't in FDS, it was in Parallax Serial Terminal. Here is

  PUB Char(bytechr)
  {{Send single-byte character.  Waits for room in transmit buffer if necessary.
    Parameter:
      bytechr - character (ASCII byte value) to send.}}
  
    repeat until (tx_tail <> ((tx_head + 1) & BUFFER_MASK))
    tx_buffer[tx_head] := bytechr
    tx_head := (tx_head + 1) & BUFFER_MASK
  
    if rxtx_mode & %1000
      CharIn
  

  As Andy points out, that was just another name for tx() -- this is from the original FDS.

  PUB Tx(txByte)
  {{
     Places a byte into the transmit buffer for transmission (may wait for room in buffer).
  
     Parameters: txByte = the byte to be transmitted
     return:     none
  
     example usage: serial.Tx($0D)
  
     expected outcome of example usage call: Transmits the byte $0D serially on the txPin
  }}
  
    repeat until (tx_tail <> (tx_head + 1) & $F)          'wait until the buffer has room                        
    tx_buffer[tx_head] := txByte                          'place the byte into the buffer
    tx_head := (tx_head + 1) & $F                         'advance the buffer's pointer
  
    if rxtx_mode & %1000                                  'if ignoring rx echo
      Rx                                                  '   receive the echoed byte and discard
  

  The original FDS has a 16-byte buffer, which is why $F is used as a mask.