STPMS new architecture software loading verification test report

The STPMS software used in this verification test is transplanted to the GNSS chip AG3335M of Airoha, a company under MediaTek, with the latest software architecture. This new architecture software modularizes the overall architecture of STPMS and GNSS software, integrating the relationship between STPMS and GNSS. The interface between them is standardized as an API interface, in which the running software program of STPMS is completely separated from GNSS. In addition, the performance of STPMS on this chip is also optimized.

Airoha's AG3335 GNSS chip MCU is ARM Cortex M4, runs at a maximum frequency of 562Mz, contains 100K RAM, 2MB Flash, and has 3 UART interfaces. STPMS uses UART0 to simultaneously transmit GNSS NMEA information and STPMS information, and UART1 is used as a test Use interfaces. UART2, which was originally scheduled to be used as the Bluetooth interface, was not pulled out by Anfu's EVK module.UG Tek solved this problem by modifying the original test software architecture to simulate the Bluetooth function. This time I used nFore’s EVK number NF6811Q, and the module was Enfor’s number 6806Q. The SDK required for porting the software is IoT_SDK_for_Location_V3.0.0 provided by MediaTek.

The purpose of this vehicle test is not only to increase the use of domestic GNSS chips as the STPMS platform, but also to verify whether the functions and performance of the new modular software architecture of STPMS meet the standards. The new version of STPMS software architecture is shown in the figure below. STPMS is completely modular and operates independently, and interfaces with GNSS chip software through standard interfaces. This will greatly improve the efficiency of STPMS transplantation.It also prepares for the transplantation of STPMS to GNSS chips of different brands around the world to enter the global market..

This time, Mostyle conducted the loading test using a Toyota Sienna 7-seater bus and ran it on ordinary roads in urban areas of Taipei and Keelung. First perform low and high speed self-learning calibration, and then perform one, two, three and four rounds of undervoltage testing. The undervoltage standard is in accordance with the Chinese mainland GB26149 national standard. The completed test results are as follows:

The following conclusions can be drawn from the above test results:

1. The new version of STPMS tire pressure alarm performance is far better than the national standard requirements by 2 to 10 times!
2. The new version of STPMS software architecture is verified to be feasible!