diff --git a/cores/esp8266/esp8266_undocumented.h b/cores/esp8266/esp8266_undocumented.h
index 277d467698..5e68e53fa1 100644
--- a/cores/esp8266/esp8266_undocumented.h
+++ b/cores/esp8266/esp8266_undocumented.h
@@ -52,12 +52,22 @@ calls to ets_install_putc1().
*/
extern void uart_buff_switch(uint8_t);
+/*
+ ROM function, ets_install_uart_printf, is used to installs the internal ROM
+ putc1 driver used to print on UART0 or UART1. The installed driver is use by ets_printf.
+ Side note, ets_install_uart_printf just happens to return the address of the
+ internal putc1 driver installed.
+*/
+extern void ets_install_uart_printf(void);
+
/*
ROM function, ets_uart_printf(), prints on the UART selected by
uart_buff_switch(). Supported format options are the same as vprintf(). Also
has cooked newline behavior. No flash format/string support; however, ISR safe.
- Also, uses a static function in ROM to print characters which is only
- controlled by uart_buff_switch().
+ It also uses a static function in ROM to print characters. The UART selection
+ is handled by a prior call to uart_buff_switch(). An advantage over ets_printf,
+ this call is not affected by calls made to ets_install_putc1 or
+ ets_install_putc2.
*/
extern int ets_uart_printf(const char *format, ...) __attribute__ ((format (printf, 1, 2)));
@@ -236,7 +246,6 @@ extern void Cache_Read_Disable();
extern int32_t system_func1(uint32_t);
extern void clockgate_watchdog(uint32_t);
extern void pm_open_rf();
-extern void ets_install_uart_printf(uint32_t uart_no);
extern void UartDwnLdProc(uint8_t* ram_addr, uint32_t size, void (**user_start_ptr)());
extern int boot_from_flash();
extern void ets_run() __attribute__((noreturn));
diff --git a/cores/esp8266/reboot_uart_dwnld.cpp b/cores/esp8266/reboot_uart_dwnld.cpp
index 7b58fb2224..d234c9c026 100644
--- a/cores/esp8266/reboot_uart_dwnld.cpp
+++ b/cores/esp8266/reboot_uart_dwnld.cpp
@@ -106,7 +106,7 @@ static inline void __wsr_vecbase(uint32_t vector_base) {
const uint32_t uart_no = 0;
uartAttach();
Uart_Init(uart_no);
- ets_install_uart_printf(uart_no);
+ ets_install_uart_printf();
/* reverse engineered from boot_from_something() */
const uint16_t divlatch = uart_baudrate_detect(uart_no, 0);
@@ -148,4 +148,3 @@ static inline void __wsr_vecbase(uint32_t vector_base) {
esp8266UartDownloadMode();
}
-
diff --git a/libraries/ESP8266WebServer/examples/HelloServerBearSSL/HelloServerBearSSL.ino b/libraries/ESP8266WebServer/examples/HelloServerBearSSL/HelloServerBearSSL.ino
index 8e9f4cd5b2..185914f305 100644
--- a/libraries/ESP8266WebServer/examples/HelloServerBearSSL/HelloServerBearSSL.ino
+++ b/libraries/ESP8266WebServer/examples/HelloServerBearSSL/HelloServerBearSSL.ino
@@ -173,10 +173,14 @@ void processKey(Print& out, int hotKey) {
}
break;
}
- case 'P':
+#ifdef DEBUG_ESP_PORT
+ // From this context stack_thunk_dump_stack() will only work when Serial
+ // debug is enabled.
+ case 'p':
out.println(F("Calling stack_thunk_dump_stack();"));
stack_thunk_dump_stack();
break;
+#endif
case 'R':
out.printf_P(PSTR("Restart, ESP.restart(); ...\r\n"));
ESP.restart();
@@ -191,7 +195,9 @@ void processKey(Print& out, int hotKey) {
out.println(F(" h - Free Heap Report;"));
out.println(F(" i - iRAM umm_info(null, true);"));
out.println(F(" d - dRAM umm_info(null, true);"));
+#ifdef DEBUG_ESP_PORT
out.println(F(" p - call stack_thunk_dump_stack();"));
+#endif
out.println(F(" R - Restart, ESP.restart();"));
out.println(F(" ? - Print Help"));
out.println();
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