TEMP: NONA_WLAN: add workaround for R0

Author: facchinm

boards.txt

@@ -211,7 +211,7 @@ nona_wlan.build.usb_product="Arduino NONA WLAN"
 nona_wlan.build.usb_manufacturer="Arduino LLC"
 nona_wlan.build.board=SAMD_NONA_WLAN
 nona_wlan.build.core=arduino
-nona_wlan.build.extra_flags=-DCRYSTALLESS -D__SAMD21G18A__ {build.usb_flags}
+nona_wlan.build.extra_flags=-DCRYSTALLESS -D__SAMD21G18A__ {build.usb_flags} {build.tx_rx_swap}
 nona_wlan.build.ldscript=linker_scripts/gcc/flash_with_bootloader.ld
 nona_wlan.build.openocdscript=openocd_scripts/arduino_zero.cfg
 nona_wlan.build.variant=nona_wlan
@@ -220,6 +220,12 @@ nona_wlan.build.pid=0x8057
 nona_wlan.bootloader.tool=openocd
 nona_wlan.bootloader.file=nona_wlan/samd21_sam_ba_arduino_nona_wlan.bin
 
+menu.r0_tx_rx_bug=TX RX swapped
+nona_wlan.menu.r0_tx_rx_bug.no=No
+nona_wlan.menu.r0_tx_rx_bug.no.build.tx_rx_swap=
+nona_wlan.menu.r0_tx_rx_bug.yes=Yes
+nona_wlan.menu.r0_tx_rx_bug.yes.build.tx_rx_swap=-DTX_RX_NINA_SWAPPED_R0
+
 # Arduino MKR FOX 1200
 # --------------------
 mkrfox1200.name=Arduino MKR FOX 1200

variants/nona_wlan/variant.h

@@ -186,15 +186,18 @@ extern Uart Serial1;
 
 // Serial1
 extern Uart Serial2;
-extern Uart SerialBLE;
+#ifdef TX_RX_NINA_SWAPPED_R0
+// bug in R0, use MixedSerial(Serial2, 30) as SerialNina - 115200bps max
 #define PIN_SERIAL2_RX       (29ul)
 #define PIN_SERIAL2_TX       (30ul)
-//#define PAD_SERIAL2_TX       (UART_TX_RTS_CTS_PAD_0_2_3)
 #define PAD_SERIAL2_TX       (UART_TX_PAD_2)
-//#define PAD_SERIAL2_RX       (SERCOM_RX_PAD_1)
 #define PAD_SERIAL2_RX       (SERCOM_RX_PAD_0)
-#define PIN_SERIAL2_RTS      (24u)
-#define PIN_SERIAL2_CTS      (25u)
+#else
+#define PIN_SERIAL2_RX       (30ul)
+#define PIN_SERIAL2_TX       (29ul)
+#define PAD_SERIAL2_TX       (UART_TX_PAD_0)
+#define PAD_SERIAL2_RX       (SERCOM_RX_PAD_1)
+#endif
 
 extern Uart SerialHCI;
 #define PIN_SERIALHCI_RX (23ul)