CN205210878U - USB interface converting equipment based on STM32 singlechip - Google Patents

Abstract

A USB interface conversion device based on STM32 single-chip microcomputer, its structure is: the PC is connected to the USB interface of the STM32 single-chip microcomputer through USB, and the SPI interface, USARTI interface and I2C interface of the STM32 single-chip microcomputer are respectively connected to the level conversion module; STM32 The CAN interface of the single-chip microcomputer is connected to the level conversion module through the CAN communication chip, and the USART2 interface of the STM32 single-chip microcomputer is connected to the level conversion module through the communication chip; the level conversion module includes a level conversion chip and a power conversion module. The utility model can make the USB interface conversion equipment compatible with different test system voltage requirements, has strong applicability, convenient use and low cost.

Description

A USB interface conversion device based on STM32 microcontroller

technical field

The utility model relates to communication technology, in particular to a USB-based interface conversion device.

Background technique

In the field of electronic communication, the conversion between different interface signals is often involved, such as the conversion between USB to RS232, USB to SPI and other protocols. However, most of the existing signal conversion devices are one-to-one, that is, one adapter can only convert one signal, and for some application terminals that need to use multiple communication formats, it is necessary to configure multiple adapters. convenient. Although there are devices that connect USB to multiple interfaces, they require specific host computer software and cannot be compatible with general host computer software such as serial port assistants. And most of them support a certain communication protocol. Taking the SPI communication protocol as an example, the SPI communication protocol has 4 modes, and the general interface only supports one of the modes. If the chip to be tested is a voltage chip, such as a chip with a voltage of 1.5V and 1.2V, the traditional 5V or 3.3V conversion interface cannot be measured for such low-voltage devices because there is no level conversion circuit. Therefore, a method based on STM32 is proposed. The chip's USB interface conversion device.

Contents of the invention

In order to solve the above technical problems, the utility model provides a USB interface conversion device based on the STM32 single-chip microcomputer, by setting the STM32 single-chip microcomputer and the level conversion module between the PC and the external interface, and setting the STM32 single-chip microcomputer and the level conversion module There is a communication chip, and a power conversion module is installed at the output end of the level conversion module, which solves the problem that one kind of adapter in the prior art can only convert one kind of signal, and some application terminals that need to use multiple communication formats It is necessary to configure a variety of adapters, which is a technical problem that is inconvenient to use.

In order to achieve the above object, the technical solution adopted by the utility model is: a USB interface conversion device based on STM32 single-chip microcomputer, which is characterized in that: PC is connected to the USB interface of STM32 single-chip microcomputer through USB, the SPI interface of STM32 single-chip microcomputer, USARTI The interface and the I2C interface are respectively connected to the level conversion module; the CAN interface of the STM32 microcontroller is connected to the level conversion module through the CAN communication chip, and the USART2 interface of the STM32 single chip is connected to the level conversion module through the communication chip; the level conversion module Including level conversion chip and power conversion module.

The CAN communication chip is TAJ1050, the communication chip is MAX485, and the level conversion chip is YF08E.

The beneficial effects of the utility model are: the utility model provides a USB interface conversion device based on the STM32 single-chip microcomputer, by setting the STM32 single-chip microcomputer and the level conversion module between the PC and the external interface, and between the STM32 single-chip microcomputer and the level conversion The module is provided with a communication chip, and the output end of the level conversion module is provided with a power conversion module. Through the above structure, the utility model can make the USB interface conversion device compatible with different test system voltage requirements, has strong applicability, and is convenient to use and low in cost.

Description of drawings

Fig. 1: is the circuit block diagram of the present utility model.

Fig. 2: is the schematic circuit diagram of the utility model.

detailed description

As shown in Figure 1-2, a USB interface conversion device based on STM32 single-chip microcomputer, its structure is: PC is connected to the USB interface of STM32 single-chip microcomputer 1 through USB, SPI interface 6 of STM32 single-chip microcomputer 1, USARTI interface 4 and The I2C interface 5 is respectively connected to the level conversion module 3; the CAN interface 9 of the STM32 single-chip microcomputer 1 is connected to the level conversion module 3 through the CAN communication chip 10, and the USART2 interface 7 of the STM32 single-chip microcomputer 1 is connected to the level conversion through the communication chip 8 On the module 3; the level conversion module 3 includes a level conversion chip 3-1 and a power conversion module 3-2. The CAN communication chip 10 is TAJ1050, the communication chip 8 is MAX485, and the level conversion chip 3-1 is chip YF08E.

The input terminal of the level shifting chip 3-1 inputs a level device interface, passes through the level shifting chip and then passes through the power conversion module 3-2, and outputs another level signal of the interface to be connected to the peripheral device. Now take the SPI interface as an example to illustrate: For example, the SPI interface 6 of STM32 microcontroller 1 is 3.3V level standard, and the chip SPI interface 13 level standard for communicating with it is 1.8V, and there is a level incompatibility between them. The problem is that through conversion, 3.3V level chips can be compatible with 1.8V level chips for communication.

There are two sets of input and output interfaces inside the level conversion chip 3-1. The input interface is equipped with several bidirectional IO interfaces. The voltage of the IO interface is the same as the voltage of the output interface. The level conversion module can enable two different voltage standards to communicate bidirectionally. .

The utility model provides an interface for transferring USB to UASRT, I2C, 485, CAN, and SPI protocols. The test work of the above-mentioned conversion interface can be completed in the serial port assistant. At the same time, a level conversion module 3 is provided to make the conversion interface compatible with different level requirements.

The USB interface of STM32 microcontroller 1 is connected to the PC through a USB cable. The USB cable is not only used as the communication interface between the PC and STM32 microcontroller 1, but also as the power supply interface of the system. The +5V voltage input by the USB interface is stabilized to 3.3 by the voltage regulator chip. V. After passing through the STM32 single-chip microcomputer 1, it is output to the input terminal of the level conversion chip 3-1 through various interfaces, and then connected to the external output terminal after being converted by the level conversion chip 3-1 and the power conversion module 3-2. The USART27 is connected with the 485 communication chip 8 to convert the RS232 serial port communication protocol into the 485 communication protocol, and the 485 communication chip 8 is connected with the input end of the level conversion chip 3-1. The CAN interface 9 is connected to the CAN communication chip 10, the CAN interface 9 is connected to the CAN communication chip 10 for CAN protocol communication, and the CAN chip 10 is connected to the input end of the level conversion chip 3-1.

The beneficial effect of the utility model is: the USB interface conversion device based on the STM32 single-chip microcomputer is connected to the USB port of the PC through the USB cable, and the VCP driver program of ST Company is installed on the PC, so that the USB device of the STM32 single-chip microcomputer can be identified as a serial port Device, that is, operate the USB interface of the STM32 microcontroller like operating a serial device. At the same time, the utility model adds a level conversion module, which can make the USB interface conversion equipment compatible with different test system voltage requirements.

Claims (2)

1. the USB interface conversion equipment based on STM32 single-chip microcomputer, it is characterized in that: PC is by being connected in the USB interface of STM32 single-chip microcomputer (1) in the middle of USB, and the SPI interface (6) of STM32 single-chip microcomputer (1), USARTI interface (4) and I2C interface (5) are connected on level switch module (3); The CAN interface (9) of STM32 single-chip microcomputer (1) is connected on level switch module (3) by CAN communication chip (10), and the USART2 interface (7) of STM32 single-chip microcomputer (1) is connected on level switch module (3) by communication chip (8); Level switch module (3) includes level transferring chip (3-1) and power transfer module (3-2).

2. a kind of USB interface conversion equipment based on STM32 single-chip microcomputer according to claim 1, it is characterized in that: described CAN communication chip (10) is TAJ1050, and communication chip (8) is MAX485, level transferring chip (3-1) is chip YF08E.