WO2012000295A1 - Dual-mcu controlling multi-channel analog signal acquisition device - Google Patents

Abstract

A dual-MCU controlling multi-channel analog signal acquisition device is composed of the following modules: the first microcontroller module, the second microcontroller module, the first multi-channel A/D converter module, the second multi-channel A/D converter module, logic not gate, programmable multi-channel selector composed of CPLD, the first multi-channel analog input interface and the second multi-channel analog input interface. The general input output P0 port of the first microcontroller module is connected to the data bus DB port of the first multi-channel A/D converter module. The INT pin of the first multi-channel A/D converter module is connected to the INTl pin of the first microcontroller module. The dual-MCU samples the analog signals alternatively with a good performance on real-time and maintainability.

Description

 Dual MCU control multi-channel high-speed analog signal collector

 Technical field

 Dual microcontroller of the present invention (hereinafter referred to as MCU) Control multi-channel analog signal collector belongs to the field of electronic communication, especially involves high-speed variation of analog signal acquisition, and converts it into digital signal for transmission to MCU for processing.

 Background technique

Digital signal communication is stable, easy to control and process, and is the most widely used communication method. With the development of information technology, more and more analog signals need to be converted into digital signals. For general low-speed analog signals, you can pass one The MCU controls an analog/digital converter (hereinafter referred to as A/D) ), but when the analog signal changes very fast, it is difficult to ensure that the acquired analog signal is not distorted, so it is very important to design a high-speed analog signal collector with superior performance. In the literature "Microcontroller and Embedded System Application" In the 9th issue of 2008, Qiu Tie published the 'Design of CAN Bus Repeater for Dual MCUs'. Two pieces of AT89C51 were used as the main control unit to double-port RAM. As a bus data buffer, a CAN bus repeater control system is built, and the dual MCUs are queried by way of inquiry. This document uses general-purpose input/output pins for associativity, but two MCUs Communication between the two MCUs can be affected by the interruption of communication. The application number is 200710140206 and the notice number is 100553149. The invention patent 'Digital Analog Converter and Conversion Method' has announced a digital-to-analog converter based on a single-channel conversion method that does not allow time-division high-speed acquisition and processing of multiple analog signals.

 Summary of the invention

 The technical problem to be solved by the present invention is that if a conventional signal acquisition method is adopted, multiple analog signals with high speed changes are collected, and the signal cannot be guaranteed to be undistorted. because, After A/D conversion, data is generally subjected to operations such as conversion, data processing, and storage. It is difficult to ensure the real-time performance of high-speed analog signal data acquisition. And the dual MCU of the present invention The multi-channel high-speed analog signal collector is controlled by a hardware complex programmable logic device (hereinafter referred to as CPLD) as a high-speed switching device with multi-channel high-speed processing analog signals, dual MCU The use of interrupt pin connection, flexible control multi-channel high-speed analog signal collector uses high-speed multi-channel switch to achieve time-sharing acquisition of analog signals, fast acquisition speed, to ensure real-time acquisition, to solve the problem of signal distortion.

 The technical solution adopted by the invention is that the dual MCU controls the multi-channel analog signal collector by the first microcontroller module I and the second microcontroller module II , the first multi-channel A/D converter module III, the second multi-channel A/D converter module IV, the logic NOT gate 1 , the programmable multi-channel selector made with CPLD 2 , the first multi-channel analog input interface 3 and the second multi-channel analog input interface 4 is composed.

 General-purpose input and output port 0 of the first microcontroller module I P0 and the first multi-channel A/D converter module The data bus DB of III is connected to transmit data of an analog signal sampling point, the interrupt pin INT of the first multi-channel A/D converter module III and the first microcontroller module The interrupt of the first pin INT1 of I is connected, and when the sampling of the first multi-channel A/D converter module III is completed, an interrupt signal is sent to the first microcontroller module I, requesting processing of data; the second microcontroller module II The general-purpose input/output port 0 P0 is connected to the data bus DB of the second multi-channel A/D converter module IV for transmitting the data of the next sampling point of the analog signal, and the second multi-channel A/D converter module IV The interrupt pin INT is connected to the interrupt pin 1 of the second microcontroller module II, INT1, when the second multi-channel A/D converter module IV is sampled, to the second microcontroller module. II sends an interrupt signal, requests processing data; the first microcontroller module I's general-purpose input and output port 1 pin 1 is used as the contact signal and the second microcontroller module The II interrupt is connected to the 0th pin INT0, and the second microcontroller module II has the general-purpose input and output port 1 pin 1 as the contact signal and the first microcontroller module. Interrupt 0 of the I pin is connected to INT0; the general-purpose I/O of the first microcontroller module I is connected to the input pin EN_IN of the logic NOT gate 1 as the 0th pin P1.0 of the logic NOT gate 1 Logic NOT gate 1 input signal; logic NOT gate 1 output pin EN_OUT is connected to programmable multi-channel selector 2 multiplex selection switching control pin SEL_SW; programmable multi-channel selector Switching status of 2 1 0th pin SW10 is connected to the analog signal input 0 channel CH0 of the first multi-channel A/D converter module III, and the switching status of the programmable multi-channel selector 2 1 1st pin SW11 is connected to the analog signal input 1 channel CH1 of the first multi-channel A/D converter module III; the switch status of the programmable multi-channel selector 2 2 0th pin SW20 is connected to analog signal input 0 channel CH0 of the second multi-channel A/D converter module IV, programmable multi-channel selector 2 switching state 2 pin 1 SW21 It is connected to the analog signal input 1 channel CH1 of the second multi-channel A/D converter module IV for time-division switching of multi-channel analog; multi-channel selector input of programmable multi-channel selector 2 is 0 Pin SW0 is connected to the analog input 0 pin CH0_COM of the first analog input interface 3, programmable multi-channel selector 2 multi-channel selector input pin 1 SW1 Connect to the analog input pin 1 of the second analog input terminal 4, CH1_COM.

 Programmable Multi-Channel Selector made with CPLD 2 The logic function truth table is as follows:

SEL_SW pin status	Multi-channel selection function description
0	SW0 is connected to SW10; SW1 is connected to SW11
1	SW0 is connected to SW20; SW1 is connected to SW21.

 The effect of the invention is to use dual MCUs with A/D The converter and programmable high-speed switch collect and process the data converted by the analog signal, and the multi-way selector made by the programmable logic device has novel structure, high switching speed and fast signal response. Two MCUs Alternately collect and process analog signal data, no need to wait in time, and good real-time performance. The two MCUs communicate with each other, the interface is flexible and convenient, easy to control and expand; has good maintainability, good economy and convenient manufacture. low cost.

 DRAWINGS

Figure 1 shows the overall structure of a dual MCU control multichannel analog signal collector . Among them, I - first microcontroller module, II - second microcontroller module, III - first multi-channel A / D converter module, IV - second multi-channel A / D converter module, 1 - logic non Gate, 2 - Programmable Multi-Channel Selector, 3 - First Analog Input Interface, 4 - Second Analog Input Interface; INT0 - Interrupt 0th Pin, INT1 - Interrupt 1st Pin, INT - Interrupt Pin , P0 - general purpose input and output port 0, P1.0 - general purpose input and output port 1 pin 0, P1.1 - general purpose input and output port 1 pin 1, CH0 - analog signal input 0 channel, CH1 - Analog signal input 1 channel, EN_IN - input pin, EN_OUT - output pin, SEL_SW - multiplex selection switching control pin, SW10 - switch status 1 0th pin, SW11 - switch status 1 1st pin, SW20 - Switch Status 2 0th Pin, SW21 - Switch Status 2 1st Pin, SW0 - Multichannel Selector Input 0th Pin, SW1 - Multichannel Selector Input 1st Pin, CH0_COM - Analog Input 0 pin, CH1_COM - Analog input pin 1.

 Figure 2 shows the software control flow of the dual MCU control multi-channel analog signal collector.

 detailed description

 The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings and technical solutions: Dual MCU Control the connection relationship of the multi-channel analog signal collector circuit module, as shown in Figure 1 of the specification. After power-on, the dual MCU controls the software control flow of the multi-channel analog signal collector, as shown in Figure 2 of the specification. Shown. The specific implementation is as follows:

 Step 1: Define the variable SIG1-2 for the first microcontroller module I, set it to 1, and put the general input and output port 1 1 pin P1.1 is set to 1; variable SIG2-1 is defined for the second microcontroller module II to clear 0, and the general input and output port 1 pin P1.1 is set to 1 .

 Step 2: The first microcontroller module I obtains the status information of the second microcontroller module II by interrupting the 0th pin INT0, and Determine if SIG1-2 is really equal to 1 . If SIG2-1 is equal to 1, go to the third step. Otherwise, loop in this step and continue to wait for the 0th pin from the interrupt. The interrupt request occurs, and when the interrupt occurs, SIG1-2 is set; the second microcontroller module II acquires the state information of the first microcontroller module I by interrupting the 0th pin INT0, and Determine if SIG2-1 is equal to 1 . If SIG2-1 is equal to 1, go to step 6. Otherwise, loop in this step and continue waiting for interrupt 0 pin INT0. The interrupt request occurs and SIG2-1 is set when the interrupt occurs.

 Step 3: The first microcontroller module I clears the variable SIG1-2 to 0, and the general-purpose input and output port 1 pin 0 P1.0 is set to 1. The programmable multi-channel selector 2 is controlled for multi-channel switching. The programmable multi-channel selector 2 logic function truth table is as follows:

SEL_SW pin status	Multi-channel selection function description
0	SW0 is connected to SW10; SW1 is connected to SW11
1	SW0 is connected to SW20; SW1 is connected to SW21.

 As shown in Figure 1 of the specification, the input pin EN_IN input of logic NOT 1 is 1 and the output pin EN_OUT The output is 0, clearing the multi-channel selection switching control pin SEL_SW of the programmable multi-channel selector 2 to switch the programmable multi-channel selector 2 to the first multi-channel A/D converter module. The III is connected so that the first microcontroller module I is in the data acquisition state; at this time, the second microcontroller module II performs data processing.

 Step 4: The first microcontroller module I performs data acquisition. During the acquisition process, it is judged whether the data acquisition is completed. If the acquisition is completed, The first multi-channel A/D converter module III interrupt pin INT triggers the first microcontroller module I interrupt pin 1 INT1, causing the first microcontroller module I to Interrupt the service and proceed to the fifth step. Otherwise, wait for the acquisition to complete in this step; at this time, the second microcontroller module II performs data processing or waits for data acquisition.

 Step 5: The first microcontroller module I clears the general-purpose input and output port 1 pin 01.0 to 1.0, as shown in Figure 1 of the specification. As shown, when the input pin EN_IN input of logic NOT gate 1 is 0, the output pin EN_OUT output is 1 , which makes the programmable multi-channel selector 2 multiplex selection switching control pin. Set SEL_SW to 1 to switch programmable multi-channel selector 2 to the second multi-channel A/D converter module IV. The first microcontroller module I will be the general input and output port 1 first Pin P1.1 is cleared to 0. Triggering the second microcontroller module II interrupt. Bit 0 pin INT0 interrupt request occurs, setting SIG2-1 to 1.

 Step 6: The second microcontroller module II clears the variable SIG1-2 to 0; at this time, the first microcontroller module I Perform data processing or wait for data collection.

 Step 7: The second microcontroller module II performs data acquisition. During the acquisition process, it is judged whether the data acquisition is completed. If the acquisition is completed, Interrupt pin INT of the second multi-channel A/D converter module IV triggers the second pin of the second microcontroller module II, INT1, for the second microcontroller module II Interrupt the service, enter the eighth step of processing, otherwise wait for the acquisition to complete in this step.

 Step 8: The second microcontroller module II clears the general-purpose input and output port 1 pin 1 to P1.1. The first microcontroller module I interrupts the 0th pin INT0 interrupt request occurs, sets SIG1-2 to 1 and proceeds to the second step.

 The dual MCU controls the multi-channel analog signal collector, the first microcontroller module I and the second microcontroller module II performs time-division alternate acquisition and processing of analog signals, and has strong adaptability to high-speed changing analog signals. It can acquire real-time acquisition of multi-channel input analog signals, using dual micro The controller, which collects and processes data, has a short delay time and high efficiency, and can adapt to the acquisition and processing of high-speed analog signals. Programmable Multi-Channel Selector 2 Programmable with CPLD hardware for high switching speeds. Dual MCU With multi-channel A/D converter and programmable multi-channel selector device, it has strong scalability and is easy to transplant to other analog signal data acquisition devices.

Claims (1)

1. The dual MCU controls the multi-channel analog signal collector, wherein the dual MCU controls the multi-channel analog signal collector by the first microcontroller module (I), Second microcontroller module (II), first multi-channel A/D converter module (III), second multi-channel A/D converter module (IV), logic NOT gate (1), CPLD The programmable multi-channel selector (2), the first multi-channel analog input interface (3) and the second multi-channel analog input interface (4) are formed;

The general-purpose input/output port 0 of the first microcontroller module (I) is connected to the data bus DB of the first multi-channel A/D converter module (III). The interrupt pin INT of the first multi-channel A/D converter module (III) is connected to the interrupt pin 1 of the first microcontroller module (I), INT1; the general-purpose input and output of the second microcontroller module (II) 0th Port P0 is connected to the data bus DB of the second multi-channel A/D converter module (IV), and the interrupt pin INT of the second multi-channel A/D converter module (IV) is connected to the second microcontroller module ( II) Interrupt pin 1 is connected to INT1; the first microcontroller module (I) is general-purpose I/O port 1 pin P1.1 as the contact signal and the second microcontroller module ( II) Interrupt pin 0 is connected to INT0, and the second microcontroller module (II) is general-purpose I/O port 1 pin P1.1 as the contact signal and the first microcontroller module ( I) interrupt is connected to pin 0 of INT0; the first microcontroller module (I) is general-purpose input and output port 1 bit 0 pin P1.0 and logic NOT gate (1) input pin EN_IN Connected as the input control signal of the logic NOT gate (1); the output pin EN_OUT of the logic NOT gate (1) is connected to the multi-selection switching control pin of the programmable multi-channel selector (2) SEL_SW; switch state of programmable multi-channel selector ( 2 ) 1 0 pin SW10 and analog input of the first multi-channel A/D converter module ( III) 0 channel CH0 is connected, the switch status of the programmable multi-channel selector ( 2 ) 1 1st pin SW11 and the analog input of the first multi-channel A/D converter module ( III) 1 channel CH1 Connected; programmable multi-channel selector (2) switch status 2 0th pin SW20 and 2nd multi-channel A/D converter module (IV) analog signal input 0 channel CH0 Connected, programmable multi-channel selector (2) switch status 2 1st pin SW21 and 2nd multi-channel A/D converter module (IV) analog signal input 1 channel CH1 Connected; programmable multi-channel selector (2) multi-channel selector input 0 pin SW0 and first analog input interface (3) analog input 0th pin CH0_COM Connected, programmable multi-channel selector (2) multi-channel selector input 1st pin SW1 and 2nd analog input interface (4) analog input 1st pin CH1_COM Connected.

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