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UART IRQ stops firing after string received and one character transmitted

  1. I can send a CR terminated string through the UART using tx fifo OK.
  2. BUT, if I receive a string from the UART rx OK first, and then try to send a string, only the 1st character is transmitted through the UART tx, then the uart IRQ stops firing (UART0_IRQHandler handler not firing), and I never see TX ready (NRF_UART_EVENT_TXDRDY).
  3. I am using teraterm pro terminal to communicate (send/receive) using COM1 at 9600baud With the NRF51 board.
  4. I am using Eclipse for code development, and J-Link RTT.
  5. I can watch the receive buffer never getting cleared out, and so am wondering if I am missing some actions that should be done after receiving completed.
  6. The string I am trying to send goes into the tx fifo OK.
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