diff --git a/esp8266/esp_mphal.c b/esp8266/esp_mphal.c
index 821866f..53a1700 100644
--- a/esp8266/esp_mphal.c
+++ b/esp8266/esp_mphal.c
@@ -49,23 +49,30 @@
     ets_delay_us(us);
 }
 
-int mp_hal_uart0_rx_chr(void) {
-    return uart0_rx();
+int mp_hal_stdin_rx_chr(void) {
+    for (;;) {
+        int c = uart0_rx();
+        if (c != -1) {
+            return c;
+        }
+        mp_hal_udelay(1);
+        mp_hal_feed_watchdog();
+    }
 }
 
-void mp_hal_uart0_write_str(const char *str) {
+void mp_hal_stdout_tx_str(const char *str) {
     while (*str) {
         uart_tx_one_char(UART0, *str++);
     }
 }
 
-void mp_hal_uart0_write_strn(const char *str, uint32_t len) {
+void mp_hal_stdout_tx_strn(const char *str, uint32_t len) {
     while (len--) {
         uart_tx_one_char(UART0, *str++);
     }
 }
 
-void mp_hal_uart0_write_strn_cooked(const char *str, uint32_t len) {
+void mp_hal_stdout_tx_strn_cooked(const char *str, uint32_t len) {
     while (len--) {
         if (*str == '\n') {
             uart_tx_one_char(UART0, '\r');