nrf/boards: Use 64 byte raw-paste buffer on PCA10028 and PCA10040.

To workaround issues with JLink CDC.

Signed-off-by: Damien George <damien@micropython.org>

Author: dpgeorge

ports/nrf/boards/PCA10028/mpconfigboard.h

@@ -60,3 +60,8 @@
 #define MICROPY_HW_SPI0_MISO        (28)
 
 #define HELP_TEXT_BOARD_LED         "1,2,3,4"
+
+// The JLink CDC on the PCA10028 cannot accept more than 64 incoming bytes at a time.
+// That makes the UART REPL unreliable in general.  But it can be improved to some
+// extent by setting the raw-paste buffer size to that limit of 64.
+#define MICROPY_REPL_STDIN_BUFFER_MAX (64)

ports/nrf/boards/PCA10040/mpconfigboard.h

@@ -64,3 +64,8 @@
 #define MICROPY_HW_PWM2_NAME        "PWM2"
 
 #define HELP_TEXT_BOARD_LED         "1,2,3,4"
+
+// The JLink CDC on the PCA10040 cannot accept more than 64 incoming bytes at a time.
+// That makes the UART REPL unreliable in general.  But it can be improved to some
+// extent by setting the raw-paste buffer size to that limit of 64.
+#define MICROPY_REPL_STDIN_BUFFER_MAX (64)