From 34e224a4afbacbc8f1621c415b6d3fc42ed84cb8 Mon Sep 17 00:00:00 2001 From: Damien George Date: Wed, 14 Mar 2018 13:18:43 +1100 Subject: [PATCH] esp32/machine_uart: Return None from UART read if no data is available. This is instead of returning an empty bytes object, and matches how other ports handle non-blocking UART read behaviour. --- ports/esp32/machine_uart.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/ports/esp32/machine_uart.c b/ports/esp32/machine_uart.c index 06d9c0b0da..26cbc88fcd 100644 --- a/ports/esp32/machine_uart.c +++ b/ports/esp32/machine_uart.c @@ -297,7 +297,7 @@ STATIC mp_uint_t machine_uart_read(mp_obj_t self_in, void *buf_in, mp_uint_t siz int bytes_read = uart_read_bytes(self->uart_num, buf_in, size, time_to_wait); - if (bytes_read < 0) { + if (bytes_read <= 0) { *errcode = MP_EAGAIN; return MP_STREAM_ERROR; }