在单片机stm32上驱动gsm/gprs模块SIM900A的代码，模块的驱动同时也包括了gprs的部分功能。本程序是在rt-thread实时系统的基础上编写的，主程序实现了定位器的功能。-Gsm/gprs the module SIM900A the code in microcontroller stm32 drive drive module also includes some of the features of the gprs. This program is prepared on