acassis commented on code in PR #9255:
URL: https://github.com/apache/nuttx/pull/9255#discussion_r1191681309
##########
arch/xtensa/src/esp32s3/esp32s3_lowputc.c:
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@@ -795,6 +795,12 @@ void esp32s3_lowputc_config_pins(const struct
esp32s3_uart_s *priv)
{
/* Configure the pins */
+ /* Keep TX pin in high level to avoid "?" trash character
+ * This "?" is the Unicode replacement character (U+FFFD)
+ */
+
+ esp32s3_gpiowrite(priv->txpin, true);
Review Comment:
No, the issue happens in both case, be it using gpio matrix or native iomux.
Should be something in the serial controller
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