Add initial MKRNbIoT support

Author: facchinm

boards.txt

@@ -220,6 +220,35 @@ mkrgsm1400.build.pid=0x8052
 mkrgsm1400.bootloader.tool=openocd
 mkrgsm1400.bootloader.file=mkrgsm1400/samd21_sam_ba_arduino_mkrgsm1400.bin
 
+# Arduino MKR NB-IoT 1450
+# --------------------
+mkrgsm1400.name=Arduino MKR NB-IoT 1450
+mkrgsm1400.vid.0=0x2341
+mkrgsm1400.pid.0=0x8054
+mkrgsm1400.vid.1=0x2341
+mkrgsm1400.pid.1=0x0054
+
+mkrgsm1400.upload.tool=bossac
+mkrgsm1400.upload.protocol=sam-ba
+mkrgsm1400.upload.maximum_size=262144
+mkrgsm1400.upload.use_1200bps_touch=true
+mkrgsm1400.upload.wait_for_upload_port=true
+mkrgsm1400.upload.native_usb=true
+mkrgsm1400.build.mcu=cortex-m0plus
+mkrgsm1400.build.f_cpu=48000000L
+mkrgsm1400.build.usb_product="Arduino MKR NB-IoT 1450"
+mkrgsm1400.build.usb_manufacturer="Arduino LLC"
+mkrgsm1400.build.board=SAMD_MKRGSM1400
+mkrgsm1400.build.core=arduino
+mkrgsm1400.build.extra_flags=-D__SAMD21G18A__ {build.usb_flags} -DUSE_BQ24195L_PMIC -DNO_HW_FLOW_CONTROL
+mkrgsm1400.build.ldscript=linker_scripts/gcc/flash_with_bootloader.ld
+mkrgsm1400.build.openocdscript=openocd_scripts/arduino_zero.cfg
+mkrgsm1400.build.variant=mkrgsm1400
+mkrgsm1400.build.vid=0x2341
+mkrgsm1400.build.pid=0x8054
+mkrgsm1400.bootloader.tool=openocd
+mkrgsm1400.bootloader.file=mkrgsm1400/samd21_sam_ba_arduino_mkrgsm1400.bin
+
 # Arduino MKR WAN 1300
 # --------------------
 mkrwan1300.name=Arduino MKR WAN 1300

variants/mkrgsm1400/variant.cpp

@@ -233,6 +233,12 @@ void initVariant() {
   // set GSM DTR to LOW on start
   pinMode(GSM_DTR, OUTPUT);
   digitalWrite(GSM_DTR, LOW);
+
+#ifdef NO_HW_FLOW_CONTROL
+  // set GSM DTR to LOW on start
+  pinMode(PIN_SERIAL2_RTS, OUTPUT);
+  digitalWrite(PIN_SERIAL2_RTS, LOW);
+#endif
 }
 
 // Serial1
@@ -244,10 +250,14 @@ void SERCOM5_Handler()
 }
 
 // SerialGSM
+
+#ifdef NO_HW_FLOW_CONTROL
+Uart Serial2(&sercom2, PIN_SERIAL2_RX, PIN_SERIAL2_TX, PAD_SERIAL2_RX, PAD_SERIAL2_TX);
+#else
 Uart Serial2(&sercom2, PIN_SERIAL2_RX, PIN_SERIAL2_TX, PAD_SERIAL2_RX, PAD_SERIAL2_TX, PIN_SERIAL2_RTS, PIN_SERIAL2_CTS);
+#endif
 
 void SERCOM2_Handler()
 {
   Serial2.IrqHandler();
 }
-