From 0d58f6ba5e12bb7c00c04d752baf64a8c6c38726 Mon Sep 17 00:00:00 2001
From: "Peter D. Gray" <peter@conalgo.com>
Date: Tue, 17 Jul 2018 14:22:35 -0400
Subject: [PATCH] stm32/mphalport: Make mp_hal_stdin_rx_chr/stdout_tx_strn
 weakly linked.

To allow for customizations.
---
 ports/stm32/mphalport.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/ports/stm32/mphalport.c b/ports/stm32/mphalport.c
index a2f8e412ee..206221721b 100644
--- a/ports/stm32/mphalport.c
+++ b/ports/stm32/mphalport.c
@@ -19,7 +19,7 @@ NORETURN void mp_hal_raise(HAL_StatusTypeDef status) {
     mp_raise_OSError(mp_hal_status_to_errno_table[status]);
 }
 
-int mp_hal_stdin_rx_chr(void) {
+MP_WEAK int mp_hal_stdin_rx_chr(void) {
     for (;;) {
 #if 0
 #ifdef USE_HOST_MODE
@@ -52,7 +52,7 @@ void mp_hal_stdout_tx_str(const char *str) {
     mp_hal_stdout_tx_strn(str, strlen(str));
 }
 
-void mp_hal_stdout_tx_strn(const char *str, size_t len) {
+MP_WEAK void mp_hal_stdout_tx_strn(const char *str, size_t len) {
     if (MP_STATE_PORT(pyb_stdio_uart) != NULL) {
         uart_tx_strn(MP_STATE_PORT(pyb_stdio_uart), str, len);
     }