RE: UART lock up

shadowsky — Wed, 02 Aug 2017 07:08:23 GMT

Thank Sigurd for your answer.

I tried to run my program with the patch you suggest me (see this link). But it didn't help to solve my issue.

After further research in the nordic library I found what was causing me trouble and patch it (see bellow), which resolved everything in my case.

My problem because I wasn't reading my FIFO buffer fast enough (this happen in purpose) I started to have the length between my reading pointer and my writing pointer bigger than the FIFO length buffer than I declared.

file modified: components/libraries/uart/app_uart_fifo.c (line 21)

static __INLINE uint32_t fifo_length(app_fifo_t * const fifo)
 {
   uint32_t tmp = fifo->read_pos;
-  return fifo->write_pos - tmp;
+  return (uint32_t)((uint32_t)fifo->write_pos - tmp) & fifo->buf_size_mask;
 }

file modified: components/libraries/fifo/app_fifo.c (line 30)

static __INLINE uint32_t fifo_length(app_fifo_t * p_fifo)
{
  uint32_t tmp = p_fifo->read_pos;
-  return p_fifo->write_pos - tmp;
+  return (uint32_t) ((uint32_t) p_fifo->write_pos - tmp) & p_fifo->buf_size_mask;
}

Of course if anyone think at a better solution to solve this issue I'm open to any suggestion.

RE: UART lock up

Sigurd — Tue, 01 Aug 2017 14:22:23 GMT

Hi,

Make sure that both the GPS and the nRF51 device are configured with the same settings (Baud-rate, parity, flow-control) and connected correctly(RX_PIN_NUMBER/ TX_PIN_NUMBER). Also make sure that the UART is initialized properly without error(see this post about debugging).

Also check that you are not running to the isssue described here.