samd/mphalport: Fix building with USB CDC disabled.

This commit fixes the build issues in the SAMD port that arise when
explicitly disabling USB CDC support.

The console code assumed CDC support is always enabled even if it was
disabled in mpconfigport.h.  These changes make accessing CDC
conditional to that support configuration being enabled.

Signed-off-by: Alessandro Gatti <[email protected]>

Author: agatti

ports/samd/mphalport.c

@@ -120,7 +120,9 @@ uint64_t mp_hal_ticks_us_64(void) {
 
 uintptr_t mp_hal_stdio_poll(uintptr_t poll_flags) {
     uintptr_t ret = 0;
+    #if MICROPY_HW_USB_CDC
     ret |= mp_usbd_cdc_poll_interfaces(poll_flags);
+    #endif
     #if MICROPY_PY_OS_DUPTERM
     ret |= mp_os_dupterm_poll(poll_flags);
     #endif
@@ -129,8 +131,9 @@ uintptr_t mp_hal_stdio_poll(uintptr_t poll_flags) {
 
 int mp_hal_stdin_rx_chr(void) {
     for (;;) {
-
+        #if MICROPY_HW_USB_CDC
         mp_usbd_cdc_poll_interfaces(0);
+        #endif
         int c = ringbuf_get(&stdin_ringbuf);
         if (c != -1) {
             return c;
@@ -149,11 +152,13 @@ int mp_hal_stdin_rx_chr(void) {
 mp_uint_t mp_hal_stdout_tx_strn(const char *str, mp_uint_t len) {
     mp_uint_t ret = len;
     bool did_write = false;
+    #if MICROPY_HW_USB_CDC
     mp_uint_t cdc_res = mp_usbd_cdc_tx_strn(str, len);
     if (cdc_res > 0) {
         did_write = true;
         ret = MIN(cdc_res, ret);
     }
+    #endif
     #if MICROPY_PY_OS_DUPTERM
     int dupterm_res = mp_os_dupterm_tx_strn(str, len);
     if (dupterm_res >= 0) {