UART TXEN will not enable

Discussion created by lpcware Employee on Jun 15, 2016
Latest reply on Jun 15, 2016 by lpcware
Content originally posted in LPCWare by bunrockter on Sat Aug 25 22:42:29 MST 2012
I am using the LPC4350 on a Hitex eval boar,d and I am having trouble getting UART1 up and running. I am only using the RX & TX lines, I am not using any of the modem or handshaking lines. I have followed the code examples provided by the Hitex website, but I am still seeing the same issue:

When I try to enable the transmitter by writing a 1 to bit 7 of the TEN register it remains 0;

  LPC_UART1->TER = 0x80UL;  //Enable transmit
  temp = LPC_UART1->TER;

temp always reads zero.

I don't seem to get anything out when I hook up terra term either, although I have seen the RBR register change when I have sent info from terra term.

The user manual said that this bit should default to on (1) after reset, but the debugger always reads a zero as well.

Is this a write only register? does anyone else see the TXEN bit go high when they write to it?