rp2/mphalport: Add optional dupterm support.

ports/rp2/moduos.c

@@ -26,6 +26,7 @@
 
 #include "py/objstr.h"
 #include "py/runtime.h"
+#include "extmod/misc.h"
 #include "extmod/vfs.h"
 #include "extmod/vfs_fat.h"
 #include "extmod/vfs_lfs.h"

ports/rp2/mphalport.c

@@ -27,6 +27,7 @@
 #include "py/runtime.h"
 #include "py/stream.h"
 #include "py/mphal.h"
+#include "extmod/misc.h"
 #include "shared/timeutils/timeutils.h"
 #include "tusb.h"
 #include "uart.h"
@@ -74,6 +75,9 @@ uintptr_t mp_hal_stdio_poll(uintptr_t poll_flags) {
         ret |= MP_STREAM_POLL_RD;
     }
     #endif
+    #if MICROPY_PY_OS_DUPTERM
+    ret |= mp_uos_dupterm_poll(poll_flags);
+    #endif
     return ret;
 }
 
@@ -95,6 +99,12 @@ int mp_hal_stdin_rx_chr(void) {
             }
         }
         #endif
+        #if MICROPY_PY_OS_DUPTERM
+        int dupterm_c = mp_uos_dupterm_rx_chr();
+        if (dupterm_c >= 0) {
+            return dupterm_c;
+        }
+        #endif
         MICROPY_EVENT_POLL_HOOK
     }
 }
@@ -123,6 +133,10 @@ void mp_hal_stdout_tx_strn(const char *str, mp_uint_t len) {
         }
     }
     #endif
+
+    #if MICROPY_PY_OS_DUPTERM
+    mp_uos_dupterm_tx_strn(str, len);
+    #endif
 }
 
 void mp_hal_delay_ms(mp_uint_t ms) {