Handle return code from BMA driver, and set a flag is the initialization fails. This allows to boot InfiniTime even if the device cannot initialize.

src/components/motion/MotionController.cpp

@@ -31,3 +31,6 @@ bool MotionController::ShouldWakeUp(bool isSleeping) {
   }
   return false;
 }
+void MotionController::IsSensorOk(bool isOk) {
+  isSensorOk = isOk;
+}

src/components/motion/MotionController.h

@@ -14,13 +14,16 @@ namespace Pinetime {
       uint32_t NbSteps() const { return nbSteps; }
       bool ShouldWakeUp(bool isSleeping);
 
+      void IsSensorOk(bool isOk);
+      bool IsSensorOk() const { return isSensorOk; }
+
     private:
       uint32_t nbSteps;
       int16_t x;
       int16_t y;
       int16_t z;
       int16_t lastYForWakeUp = 0;
-
+      bool isSensorOk = false;
     };
   }
 }

src/displayapp/screens/WatchFaceDigital.cpp

@@ -240,9 +240,13 @@ bool WatchFaceDigital::Refresh() {
   }
 
   stepCount = motionController.NbSteps();
-  if(stepCount.IsUpdated()) {
+  motionSensorOk = motionController.IsSensorOk();
+  if(stepCount.IsUpdated() || motionSensorOk.IsUpdated()) {
     char stepBuffer[5];
+    if(motionSensorOk.Get())
       sprintf(stepBuffer, "%lu", stepCount.Get());
+    else
+      sprintf(stepBuffer, "---", stepCount.Get());
     lv_label_set_text(stepValue, stepBuffer);
     lv_obj_align(stepValue, lv_scr_act(), LV_ALIGN_IN_BOTTOM_RIGHT, -5, -2);
     lv_obj_align(stepIcon, stepValue, LV_ALIGN_OUT_LEFT_MID, -5, 0);

src/displayapp/screens/WatchFaceDigital.h

@@ -50,6 +50,7 @@ namespace Pinetime {
           DirtyValue<int> batteryPercentRemaining  {};
           DirtyValue<bool> bleState {};
           DirtyValue<std::chrono::time_point<std::chrono::system_clock, std::chrono::nanoseconds>> currentDateTime{};
+          DirtyValue<bool> motionSensorOk  {};
           DirtyValue<uint32_t> stepCount  {};
           DirtyValue<uint8_t> heartbeat  {};
           DirtyValue<bool> heartbeatRunning  {};

src/drivers/Bma421.cpp

@@ -36,27 +36,27 @@ Bma421::Bma421(TwiMaster& twiMaster, uint8_t twiAddress) : twiMaster{twiMaster},
 
 void Bma421::Init() {
   auto ret = bma4_soft_reset(&bma);
-  ASSERT(ret == BMA4_OK);
+  if(ret != BMA4_OK) return;
 
   nrf_delay_ms(1);
 
   ret = bma423_init(&bma);
-  ASSERT(ret == BMA4_OK);
+  if(ret != BMA4_OK) return;
 
   ret = bma423_write_config_file(&bma);
-  ASSERT(ret == BMA4_OK);
+  if(ret != BMA4_OK) return;
 
   ret = bma4_set_interrupt_mode(BMA4_LATCH_MODE, &bma);
-  ASSERT(ret == BMA4_OK);
+  if(ret != BMA4_OK) return;
 
   ret = bma423_feature_enable(BMA423_STEP_CNTR, 1, &bma);
-  ASSERT(ret == BMA4_OK);
+  if(ret != BMA4_OK) return;
 
   ret = bma423_step_detector_enable(0, &bma);
-  ASSERT(ret == BMA4_OK);
+  if(ret != BMA4_OK) return;
 
   ret = bma4_set_accel_enable(1, &bma);
-  ASSERT(ret == BMA4_OK);
+  if(ret != BMA4_OK) return;
 
   struct bma4_accel_config accel_conf;
   accel_conf.odr = BMA4_OUTPUT_DATA_RATE_100HZ;
@@ -64,7 +64,9 @@ void Bma421::Init() {
   accel_conf.bandwidth = BMA4_ACCEL_NORMAL_AVG4;
   accel_conf.perf_mode = BMA4_CIC_AVG_MODE;
   ret = bma4_set_accel_config(&accel_conf, &bma);
-  ASSERT(ret == BMA4_OK);
+  if(ret != BMA4_OK) return;
+
+  isOk = true;
 }
 
 void Bma421::Reset() {
@@ -81,6 +83,7 @@ void Bma421::Write(uint8_t registerAddress, const uint8_t *data, size_t size) {
 }
 
 Bma421::Values Bma421::Process() {
+  if(not isOk) return {};
   struct bma4_accel data;
   bma4_read_accel_xyz(&data, &bma);
 
@@ -99,4 +102,6 @@ Bma421::Values Bma421::Process() {
   // X and Y axis are swapped because of the way the sensor is mounted in the PineTime
   return {steps, data.y, data.x, data.z};
 }
-
+bool Bma421::IsOk() const {
+  return isOk;
+}

src/drivers/Bma421.h

@@ -25,12 +25,13 @@ namespace Pinetime {
       void Read(uint8_t registerAddress, uint8_t *buffer, size_t size);
       void Write(uint8_t registerAddress, const uint8_t *data, size_t size);
 
+      bool IsOk() const;
+
     private:
       TwiMaster& twiMaster;
       uint8_t deviceAddress = 0x18;
-
-
       struct bma4_dev bma;
+      bool isOk = false;
     };
   }
 }

src/systemtask/SystemTask.cpp

@@ -243,6 +243,7 @@ void SystemTask::UpdateMotion() {
   if(isSleeping)
     twiMaster.Sleep();
 
+  motionController.IsSensorOk(motionSensor.IsOk());
   motionController.Update(motionValues.x,
                           motionValues.y,
                           motionValues.z,