While running UART rx and tx calls the uart_callback_set I have set during initialization will stop running. This prevents me from sending or receiving any new UART information. At no point in the code do I make attempts to change the UART configuration.
Here is the initialization code I am using.
static int uart_init(void){ int err; int pos; struct uart_data_t *rx; struct uart_data_t *tx;
uart = device_get_binding(CONFIG_BT_NUS_UART_DEV); if (!uart) { return -ENXIO; }
if (IS_ENABLED(CONFIG_USB)) { err = usb_enable(NULL); if (err) { LOG_ERR("Failed to enable USB"); return err; } }
rx = k_malloc(sizeof(*rx)); if (rx) { rx->len = 0; } else { return -ENOMEM; }
k_work_init_delayable(&uart_work, uart_work_handler);
if (IS_ENABLED(CONFIG_BT_NUS_UART_ASYNC_ADAPTER) && !uart_test_async_api(uart)) { /* Implement API adapter */ uart_async_adapter_init(async_adapter, uart); uart = async_adapter; }
err = uart_callback_set(uart, uart_cb, NULL); if (err) { LOG_ERR("Cannot initialize UART callback"); return err; }
if (IS_ENABLED(CONFIG_UART_LINE_CTRL)) { LOG_INF("Wait for DTR"); while (true) { uint32_t dtr = 0;
uart_line_ctrl_get(uart, UART_LINE_CTRL_DTR, &dtr); if (dtr) { break; } /* Give CPU resources to low priority threads. */ k_sleep(K_MSEC(100)); } LOG_INF("DTR set"); err = uart_line_ctrl_set(uart, UART_LINE_CTRL_DCD, 1); if (err) { LOG_WRN("Failed to set DCD, ret code %d", err); } err = uart_line_ctrl_set(uart, UART_LINE_CTRL_DSR, 1); if (err) { LOG_WRN("Failed to set DSR, ret code %d", err); } }
tx = k_malloc(sizeof(*tx));
if (tx) { pos = snprintf(tx->data, sizeof(tx->data), "Starting Nordic UART service example\r\n");
if ((pos < 0) || (pos >= sizeof(tx->data))) { k_free(tx); LOG_ERR("snprintf returned %d", pos); return -ENOMEM; }
tx->len = pos; } else { return -ENOMEM; }
err = uart_tx(uart, tx->data, tx->len, SYS_FOREVER_MS); if (err) { LOG_ERR("Cannot display welcome message (err: %d)", err); return err; }
return uart_rx_enable(uart, rx->data, sizeof(rx->data), 50);}
