This interface enables all Azure Sphere CLI operations that require an attached device, except for recovery (as described in the next paragraph). Service UART-The service UART provides the main programming and debugging interface between the MT3620 and the host computer. Once your device reaches the manufacturing stage, this interface can be considered optional and can be omitted. If you require the ability to debug RTApps (for example during device development), your device should support this interface. SWD interface-The SWD interface is used when debugging real-time capable applications (RTApps) that run on the M4F cores this interface is shared between the two M4F cores. It is therefore recommended to include this interface for devices that are used for software or hardware development, but it can be considered optional for devices that have reached the manufacturing stage. Under the direction of Microsoft, this interface provides a means of capturing additional diagnostic information that can be useful when debugging certain problems. Note that this UART is not usable for application debugging or diagnostics. The four interfaces have the following functions:ĭebug UART-The Debug UART enables Microsoft to perform diagnostics. The MT3620 exposes three UARTs and an SWD interface that are used for programming, Microsoft diagnostics, and provisioning the chip. This approach is documented in the stand-alone programming and debugging interface board design. For a custom board or module that uses the MT3620, it may be appropriate to have the interface chip on a separate PCB, because this hardware is required only during manufacturing or servicing, enabling per-unit cost savings. This approach is documented in the MT3620 reference development board (RDB) design. Currently, the tools do not support other FTDI chips or interface chips from different manufacturers.įor development boards, this interface chip is usually on the same PCB as the MT3620. The PC tools require the use of the Future Technology Devices International (FTDI) FT4232HQ UART-to-USB interface chip to expose the interfaces. The Azure Sphere tools include support for loading an application over USB by using the Service UART and for recovering the Azure Sphere OS by using the Recovery UART. The Azure Sphere PC software tools require the use of a USB-to-UART interface chip that exposes these interfaces to a PC in a way that allows the tools to recognize and interact with them. InĪddition, an SWD interface is available for debugging RTApps and a further UART is reserved for Microsoft diagnostics. The MT3620 exposes two dedicated UARTs and two control signals (resetĪnd recovery) for use during device provisioning and recovery.

Bq8030 eeprom interface