[efr32] Added otSysEventSignalPending and NVIC configuration to efr32mg21 (#4279)

examples/platforms/efr32mg21/Makefile.am

@@ -44,6 +44,8 @@ EFR32MG_SDK_SRCDIR                            = $(top_srcdir)/third_party/silabs
 
 libopenthread_efr32mg21_a_CPPFLAGS                                            = \
     -DPLATFORM_HEADER=\"@top_builddir@/third_party/silabs/gecko_sdk_suite/v2.6/platform/base/hal/micro/cortexm3/compiler/gcc.h\" \
+    -DEFR32_SERIES2_CONFIG1_MICRO                                               \
+    -DNVIC_CONFIG=\"platform/base/hal/micro/cortexm3/efm32/nvic-config.h\"      \
     -Wno-sign-compare                                                           \
     -DCORTEXM3                                                                  \
     -DPHY=EMBER_PHY_RAIL                                                        \

examples/platforms/efr32mg21/alarm.c

@@ -68,6 +68,7 @@ static bool     sIsRunning = false;
 
 static void RAILCb_TimerExpired(RAIL_Handle_t aHandle)
 {
+    otSysEventSignalPending();
 }
 
 void efr32AlarmInit(void)

examples/platforms/efr32mg21/radio.c

@@ -34,6 +34,7 @@
 
 #include <assert.h>
 
+#include "openthread-system.h"
 #include <openthread/config.h>
 #include <openthread/platform/alarm-milli.h>
 #include <openthread/platform/diag.h>
@@ -718,6 +719,8 @@ static void processNextRxPacket(otInstance *aInstance)
         }
     }
 
+    otSysEventSignalPending();
+
 exit:
 
     if (packetHandle != RAIL_RX_PACKET_HANDLE_INVALID)
@@ -862,6 +865,8 @@ static void RAILCb_Generic(RAIL_Handle_t aRailHandle, RAIL_Events_t aEvents)
 #endif
         }
     }
+
+    otSysEventSignalPending();
 }
 
 otError otPlatRadioEnergyScan(otInstance *aInstance, uint8_t aScanChannel, uint16_t aScanDuration)
@@ -900,11 +905,14 @@ void efr32RadioProcess(otInstance *aInstance)
 #if RADIO_CONFIG_DEBUG_COUNTERS_SUPPORT
         sRailDebugCounters.mRailPlatRadioTxDoneCbCount++;
 #endif
+
+        otSysEventSignalPending();
     }
     else if (sEnergyScanMode == ENERGY_SCAN_MODE_ASYNC && sEnergyScanStatus == ENERGY_SCAN_STATUS_COMPLETED)
     {
         sEnergyScanStatus = ENERGY_SCAN_STATUS_IDLE;
         otPlatRadioEnergyScanDone(aInstance, sEnergyScanResultDbm);
+        otSysEventSignalPending();
 
 #if RADIO_CONFIG_DEBUG_COUNTERS_SUPPORT
         sRailDebugCounters.mRailEventEnergyScanCompleted++;

examples/platforms/efr32mg21/system.c

@@ -34,7 +34,7 @@
 
 #include <string.h>
 
-#include <openthread/tasklet.h>
+#include "openthread-system.h"
 #include <openthread/platform/uart.h>
 
 #include "common/logging.hpp"
@@ -71,10 +71,18 @@ void otSysInit(int argc, char *argv[])
     OT_UNUSED_VARIABLE(argc);
     OT_UNUSED_VARIABLE(argv);
 
+    __disable_irq();
+
+#undef FIXED_EXCEPTION
+#define FIXED_EXCEPTION(vectorNumber, functionName, deviceIrqn, deviceIrqHandler)
+#define EXCEPTION(vectorNumber, functionName, deviceIrqn, deviceIrqHandler, priorityLevel, subpriority) \
+    NVIC_SetPriority(deviceIrqn, NVIC_EncodePriority(PRIGROUP_POSITION, priorityLevel, subpriority));
+#include NVIC_CONFIG
+#undef EXCEPTION
+
+    NVIC_SetPriorityGrouping(PRIGROUP_POSITION);
     CHIP_Init();
-
     halInitChipSpecific();
-
     BSP_Init(BSP_INIT_BCC);
     RTCDRV_Init();
 
@@ -83,6 +91,8 @@ void otSysInit(int argc, char *argv[])
     wakeupFem();
 #endif
 
+    __enable_irq();
+
 #if USE_EFR32_LOG
     efr32LogInit();
 #endif
@@ -160,3 +170,8 @@ void otSysProcessDrivers(otInstance *aInstance)
     efr32RadioProcess(aInstance);
     efr32AlarmProcess(aInstance);
 }
+
+__WEAK void otSysEventSignalPending(void)
+{
+    // Intentionally empty
+}

examples/platforms/efr32mg21/uart.c

@@ -34,6 +34,7 @@
 
 #include <stddef.h>
 
+#include "openthread-system.h"
 #include <openthread/platform/uart.h>
 
 #include "utils/code_utils.h"
@@ -106,11 +107,13 @@ static void receiveDone(UARTDRV_Handle_t aHandle, Ecode_t aStatus, uint8_t *aDat
     }
 
     UARTDRV_Receive(aHandle, aData, 1, receiveDone);
+    otSysEventSignalPending();
 }
 
 static void transmitDone(UARTDRV_Handle_t aHandle, Ecode_t aStatus, uint8_t *aData, UARTDRV_Count_t aCount)
 {
     sTransmitLength = 0;
+    otSysEventSignalPending();
 }
 
 static void processReceive(void)