introduction
The traditional MCU control system generally downloads the program by removing the chip and programming it with the programmer, or using the ISP method for online programming. As the user's needs and usage environment change, the system program will be upgraded. In the above two ways, the program must be upgraded by the developer. This kind of upgrade method undoubtedly greatly increases the development cost for the terminal's decentralized control system, and also delays the update time of the program. Therefore, this paper combines the wireless base station dynamic environment monitoring system, and gives a specific implementation method based on mPSD32xx series single-chip wireless remote IAP (in-application programming), which solves the above problems.
system structure
The conditions of the wireless base station power supply, air conditioner, and indoor environment of the base station are essential for the normal operation of the entire system. In order to provide a stable and reliable operating environment for the wireless base station, the acquisition system is designed.
In view of the above environment, the lower computer of the acquisition system integrates the base station power supply, the air conditioner, the temperature, humidity, smoke, and gate control in the base station, and collects various data required by the system in real time, and provides an automatic alarm function; The C/S mode sets different levels of permissions for each monitoring center. The data transmission of the system uses GPRS/GSM wireless communication network to access the Internet for remote transmission: the lower computer automatically uploads the alarm information to the monitoring center or mobile phone through GPRS/GSM; at the same time, the monitoring center or mobile phone can collect the data through GPRS/GSM network. The device performs operations such as querying and configuration to meet different practical needs. In the design process of the whole system, in order to efficiently schedule multitasking, the open source mCOSII embedded real-time operating system was selected.
Hardware design principle
mPSD32xx chip introduction
The mPSD32xx includes a standard 8032 microcontroller module and a PSD module. Modular design technology will not only constitute a number of functional blocks required for a single-chip application system (such as 8032 core, two Flash, SRAM, I/O, PLD, USB interface, I2C interface, dual UART port, for LCD The displayed DDC channel, PWM controller, 4-channel ADC, etc. are integrated on a single silicon chip, and can also be programmed in the system through JTAG ISP mode, which can simplify the design of embedded application system, shorten the product development cycle, and improve the system. Reliability, cost reduction and product size reduction.
Since the mPSD32xx series has two main memories, the main flash and the second flash, the designer can perform in-application programming while remotely updating the flash without additional memory.
Hardware interface design
The level conversion in the serial port uses Maxim's MAX202CPE chip. Since the GPRS module and the gate system module are connected to the serial port 0 of the mPSD3234A at the same time, the 74LS11 and the gate chip are used in the serial port 0 reception.
Hardware Configuration
The main flash memory is composed of 8 sectors, and the second flash memory is composed of 4 sectors. The configuration of Flash can be realized by software PSD EXPRESS, and the configuration results are as follows:
The first Flash is only used as the data space: FS0:? 0~0x1FFF & 0x8000~0xFFFF (page number is 0)
FS1~FS7: 0x8000~0xFFFF (page number is 1-7)
The second Flash is only used as program space: CSBOOT0: 0~0x1FFF & 0x8000~0x9FF
CSBOOT1: 0xA000~0xBFFF
CSBOOT2: 0xC000~0xDFFF
CSBOOT3: 0xE000~0xFFFF
RS0: 0x2000~0x3FFF
CSIOP: 0x200~0x2FF
When downloading the program, download the startup program to FS0, 0~0x1FFF and CSBOOT0, 0~0x1FFF respectively. The user program is downloaded to the FS0~FS7, 0x8000~0xFFFF sections.
Software design and implementation
GPRS and module
The GPRS module selected for this design is WAVECOM's Q2406B, which is a dual-band GPRS/GSM module (EGSM900/1800MHz or EGSM900/1900 MHz), embedded with a complete TCP/IP protocol stack, and can be directly connected to the Internet through AT commands. And its design and development in line with the ETSI GSM Phase 2 standard. The MCU communicates with this module through the serial port in full accordance with the standard AT command using a 9.6 kbps baud rate.
The initialization procedure of the module is as follows:
Void GPRS_init()
{
mPSD_UART_Putchar ("AT+CMGD=1,4",0);?? //Delete all SMS
mPSD_UART_Putchar ("AT+CRES",0);?????? //Release GPRS module memory
mPSD_UART_Putchar ("AT+CSCA?",0);????? //Query the short message center number
mPSD_UART_Putchar ("AT+CMGF=0",0);???? //0: PDU mode, 1: text mode
mPSD_UART_Putchar ("AT+CMEE=1",0);?????? //Open the error code prompt message
mPSD_UART_Putchar ("AT+CNMI=0,1",0);???? //Open the short message message
mPSD_UART_Putchar("ATE0",0);??????????? //Close the echo
mPSD_UART_Putchar ("AT&W",0);
?}
Among them, mPSD_UART_Putchar ("ABCD", 0) function is: mPSD3234A sends the string "ABCD" to the GPRS module through serial port 0.
Introduction to IAP
IAP is a programming mode applied to Flash program memory. The program memory space can be read, erased, and written under application control. Much like the ISP operation, there is no need to remove the chip from the board and program it with the programmer. The difference between the two is that the ISP usually erases and programs the whole chip. Under manual operation, the program is downloaded to the Flash through the PC serial port, while the IAP reads and writes another program Flash under the control of a certain program. operating. 
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