Updated PX4 use / API of low level GPIO and other hardware-centric system facilities

src/drivers/ms5611/ms5611_nuttx.cpp

@@ -486,14 +486,14 @@ MS5611::ioctl(struct file *filp, int cmd, unsigned long arg)
 				return -EINVAL;
 			}
 
-			irqstate_t flags = irqsave();
+			irqstate_t flags = px4_enter_critical_section();
 
 			if (!_reports->resize(arg)) {
-				irqrestore(flags);
+				px4_leave_critical_section(flags);
 				return -ENOMEM;
 			}
 
-			irqrestore(flags);
+			px4_leave_critical_section(flags);
 			return OK;
 		}
 

src/drivers/ms5611/ms5611_spi.cpp

@@ -152,11 +152,6 @@ MS5611_SPI::init()
 		goto out;
 	}
 
-	/* sharing a bus with NuttX drivers */
-#if defined (CONFIG_ARCH_BOARD_PX4FMU_V4)
-	//set_lockmode(SPI::LOCK_THREADS);
-#endif
-
 	/* send reset command */
 	ret = _reset();