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samples: drivers: uart: Detect missing FIFO mode in echo_bot

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Print an error message if the UART doesn't support FIFO mode or FIFO
mode is not enabled.

Previously the sample would run with no errors, but wouldn't receive or
echo any data.

Signed-off-by: Trent Piepho <tpiepho@gmail.com>
This commit is contained in:
Trent Piepho 2022-12-19 10:47:13 -08:00 • committed by Carles Cufí
commit 8c8d41c32f
1 changed files with 12 additions and 1 deletions
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13
samples/drivers/uart/echo_bot/src/main.c
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@ -78,7 +78,18 @@ void main(void)
}
/* configure interrupt and callback to receive data */
uart_irq_callback_user_data_set(uart_dev, serial_cb, NULL);
int ret = uart_irq_callback_user_data_set(uart_dev, serial_cb, NULL);
if (ret < 0) {
if (ret == -ENOTSUP) {
printk("Interrupt-driven UART API support not enabled\n");
} else if (ret == -ENOSYS) {
printk("UART device does not support interrupt-driven API\n");
} else {
printk("Error setting UART callback: %d\n", ret);
}
return;
}
uart_irq_rx_enable(uart_dev);
print_uart("Hello! I'm your echo bot.\r\n");