diff --git a/ports/cc3200/application.mk b/ports/cc3200/application.mk
index 2125274ae1..5c8fc9e40e 100644
--- a/ports/cc3200/application.mk
+++ b/ports/cc3200/application.mk
@@ -147,6 +147,7 @@ APP_LIB_SRC_C = $(addprefix lib/,\
 	utils/gchelper_native.c \
 	utils/pyexec.c \
 	utils/interrupt_char.c \
+	utils/stdout_helpers.c \
 	utils/sys_stdio_mphal.c \
 	)
 
diff --git a/ports/cc3200/hal/cc3200_hal.c b/ports/cc3200/hal/cc3200_hal.c
index bdb7d33d4a..3a35e39e1f 100644
--- a/ports/cc3200/hal/cc3200_hal.c
+++ b/ports/cc3200/hal/cc3200_hal.c
@@ -141,10 +141,6 @@ void mp_hal_delay_ms(mp_uint_t delay) {
     }
 }
 
-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) {
     if (MP_STATE_PORT(os_term_dup_obj)) {
         if (mp_obj_is_type(MP_STATE_PORT(os_term_dup_obj)->stream_o, &pyb_uart_type)) {
@@ -158,25 +154,6 @@ void mp_hal_stdout_tx_strn(const char *str, size_t len) {
     telnet_tx_strn(str, len);
 }
 
-void mp_hal_stdout_tx_strn_cooked (const char *str, size_t len) {
-    int32_t nslen = 0;
-    const char *_str = str;
-
-    for (int i = 0; i < len; i++) {
-        if (str[i] == '\n') {
-            mp_hal_stdout_tx_strn(_str, nslen);
-            mp_hal_stdout_tx_strn("\r\n", 2);
-            _str += nslen + 1;
-            nslen = 0;
-        } else {
-            nslen++;
-        }
-    }
-    if (_str < str + len) {
-        mp_hal_stdout_tx_strn(_str, nslen);
-    }
-}
-
 int mp_hal_stdin_rx_chr(void) {
     for ( ;; ) {
         // read telnet first
diff --git a/ports/esp32/main/CMakeLists.txt b/ports/esp32/main/CMakeLists.txt
index fb08c2759e..ed72a8d68b 100644
--- a/ports/esp32/main/CMakeLists.txt
+++ b/ports/esp32/main/CMakeLists.txt
@@ -27,6 +27,7 @@ set(MICROPY_SOURCE_LIB
     ${MICROPY_DIR}/lib/oofatfs/ffunicode.c
     ${MICROPY_DIR}/lib/timeutils/timeutils.c
     ${MICROPY_DIR}/lib/utils/interrupt_char.c
+    ${MICROPY_DIR}/lib/utils/stdout_helpers.c
     ${MICROPY_DIR}/lib/utils/sys_stdio_mphal.c
     ${MICROPY_DIR}/lib/utils/pyexec.c
 )
diff --git a/ports/esp32/mphalport.c b/ports/esp32/mphalport.c
index a0bafb755e..db2146d93d 100644
--- a/ports/esp32/mphalport.c
+++ b/ports/esp32/mphalport.c
@@ -108,10 +108,6 @@ int mp_hal_stdin_rx_chr(void) {
     }
 }
 
-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, uint32_t len) {
     // Only release the GIL if many characters are being sent
     bool release_gil = len > 20;
@@ -131,26 +127,6 @@ void mp_hal_stdout_tx_strn(const char *str, uint32_t len) {
     mp_uos_dupterm_tx_strn(str, len);
 }
 
-// Efficiently convert "\n" to "\r\n"
-void mp_hal_stdout_tx_strn_cooked(const char *str, size_t len) {
-    const char *last = str;
-    while (len--) {
-        if (*str == '\n') {
-            if (str > last) {
-                mp_hal_stdout_tx_strn(last, str - last);
-            }
-            mp_hal_stdout_tx_strn("\r\n", 2);
-            ++str;
-            last = str;
-        } else {
-            ++str;
-        }
-    }
-    if (str > last) {
-        mp_hal_stdout_tx_strn(last, str - last);
-    }
-}
-
 uint32_t mp_hal_ticks_ms(void) {
     return esp_timer_get_time() / 1000;
 }
diff --git a/ports/esp8266/Makefile b/ports/esp8266/Makefile
index 02ea05f76e..9d6aea603a 100644
--- a/ports/esp8266/Makefile
+++ b/ports/esp8266/Makefile
@@ -145,6 +145,7 @@ LIB_SRC_C = $(addprefix lib/,\
 	timeutils/timeutils.c \
 	utils/pyexec.c \
 	utils/interrupt_char.c \
+	utils/stdout_helpers.c \
 	utils/sys_stdio_mphal.c \
 	)
 
diff --git a/ports/esp8266/esp_mphal.c b/ports/esp8266/esp_mphal.c
index 54f9611e56..06e6cd0af5 100644
--- a/ports/esp8266/esp_mphal.c
+++ b/ports/esp8266/esp_mphal.c
@@ -91,33 +91,10 @@ void mp_hal_debug_str(const char *str) {
 }
 #endif
 
-void mp_hal_stdout_tx_str(const char *str) {
-    mp_uos_dupterm_tx_strn(str, strlen(str));
-}
-
 void mp_hal_stdout_tx_strn(const char *str, uint32_t len) {
     mp_uos_dupterm_tx_strn(str, len);
 }
 
-void mp_hal_stdout_tx_strn_cooked(const char *str, uint32_t len) {
-    const char *last = str;
-    while (len--) {
-        if (*str == '\n') {
-            if (str > last) {
-                mp_uos_dupterm_tx_strn(last, str - last);
-            }
-            mp_uos_dupterm_tx_strn("\r\n", 2);
-            ++str;
-            last = str;
-        } else {
-            ++str;
-        }
-    }
-    if (str > last) {
-        mp_uos_dupterm_tx_strn(last, str - last);
-    }
-}
-
 void mp_hal_debug_tx_strn_cooked(void *env, const char *str, uint32_t len) {
     (void)env;
     while (len--) {
diff --git a/ports/stm32/Makefile b/ports/stm32/Makefile
index 4ec03c1746..9c63707071 100644
--- a/ports/stm32/Makefile
+++ b/ports/stm32/Makefile
@@ -167,6 +167,7 @@ LIB_SRC_C += $(addprefix lib/,\
 	utils/gchelper_native.c \
 	utils/pyexec.c \
 	utils/interrupt_char.c \
+	utils/stdout_helpers.c \
 	utils/sys_stdio_mphal.c \
 	utils/mpirq.c \
 	)
diff --git a/ports/stm32/mphalport.c b/ports/stm32/mphalport.c
index 0e40911ed1..81e84ef933 100644
--- a/ports/stm32/mphalport.c
+++ b/ports/stm32/mphalport.c
@@ -53,10 +53,6 @@ MP_WEAK int mp_hal_stdin_rx_chr(void) {
     }
 }
 
-void mp_hal_stdout_tx_str(const char *str) {
-    mp_hal_stdout_tx_strn(str, strlen(str));
-}
-
 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);
@@ -67,26 +63,6 @@ MP_WEAK void mp_hal_stdout_tx_strn(const char *str, size_t len) {
     mp_uos_dupterm_tx_strn(str, len);
 }
 
-// Efficiently convert "\n" to "\r\n"
-void mp_hal_stdout_tx_strn_cooked(const char *str, size_t len) {
-    const char *last = str;
-    while (len--) {
-        if (*str == '\n') {
-            if (str > last) {
-                mp_hal_stdout_tx_strn(last, str - last);
-            }
-            mp_hal_stdout_tx_strn("\r\n", 2);
-            ++str;
-            last = str;
-        } else {
-            ++str;
-        }
-    }
-    if (str > last) {
-        mp_hal_stdout_tx_strn(last, str - last);
-    }
-}
-
 #if __CORTEX_M >= 0x03
 void mp_hal_ticks_cpu_enable(void) {
     if (!(DWT->CTRL & DWT_CTRL_CYCCNTENA_Msk)) {