esp32: Add support for and enable uos.dupterm().

ports/esp32/moduos.c

@@ -31,11 +31,11 @@
 
 #include "esp_system.h"
 
-#include "py/mpconfig.h"
-#include "py/obj.h"
 #include "py/objstr.h"
 #include "py/runtime.h"
 #include "py/mperrno.h"
+#include "py/mphal.h"
+#include "extmod/misc.h"
 #include "extmod/vfs.h"
 #include "extmod/vfs_fat.h"
 #include "genhdr/mpversion.h"
@@ -87,7 +87,13 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_1(os_urandom_obj, os_urandom);
 #if MICROPY_PY_OS_DUPTERM
 STATIC mp_obj_t os_dupterm_notify(mp_obj_t obj_in) {
     (void)obj_in;
-    mp_hal_signal_dupterm_input();
+    for (;;) {
+        int c = mp_uos_dupterm_rx_chr();
+        if (c < 0) {
+            break;
+        }
+        ringbuf_put(&stdin_ringbuf, c);
+    }
     return mp_const_none;
 }
 STATIC MP_DEFINE_CONST_FUN_OBJ_1(os_dupterm_notify_obj, os_dupterm_notify);

ports/esp32/mpconfigport.h

@@ -127,6 +127,7 @@
 #define MICROPY_PY_UBINASCII_CRC32          (1)
 #define MICROPY_PY_URANDOM                  (1)
 #define MICROPY_PY_URANDOM_EXTRA_FUNCS      (1)
+#define MICROPY_PY_OS_DUPTERM               (1)
 #define MICROPY_PY_MACHINE                  (1)
 #define MICROPY_PY_MACHINE_PIN_MAKE_NEW     mp_pin_make_new
 #define MICROPY_PY_MACHINE_PULSE            (1)

ports/esp32/mphalport.c

@@ -63,6 +63,7 @@ void mp_hal_stdout_tx_strn(const char *str, uint32_t len) {
         uart_tx_one_char(str[i]);
     }
     MP_THREAD_GIL_ENTER();
+    mp_uos_dupterm_tx_strn(str, len);
 }
 
 // Efficiently convert "\n" to "\r\n"