They used to do in C++, which contains a package with c++ library is not perfect, can be directly used to initialize a class pin. There is also a small function to do, control SIM900A module, do a half, which can be used.

STM32_C++_Template\Code\Core\core_cm3.c
..................\....\....\core_cm3.h
..................\....\....\Startup\startup_stm32f10x_md.s
..................\....\....\.......\选型说明.txt
..................\....\DMA\mydma.cpp
..................\....\...\mydma.h
..................\....\Function\mydelay.cpp
..................\....\........\mydelay.h
..................\....\........\myit.cpp
..................\....\........\myit.h
..................\....\........\mysys.cpp
..................\....\........\mysys.h
..................\....\Libraries\inc\misc.h
..................\....\.........\...\stm32f10x_adc.h
..................\....\.........\...\stm32f10x_bkp.h
..................\....\.........\...\stm32f10x_can.h
..................\....\.........\...\stm32f10x_cec.h
..................\....\.........\...\stm32f10x_crc.h
..................\....\.........\...\stm32f10x_dac.h
..................\....\.........\...\stm32f10x_dbgmcu.h
..................\....\.........\...\stm32f10x_dma.h
..................\....\.........\...\stm32f10x_exti.h
..................\....\.........\...\stm32f10x_flash.h
..................\....\.........\...\stm32f10x_fsmc.h
..................\....\.........\...\stm32f10x_gpio.h
..................\....\.........\...\stm32f10x_i2c.h
..................\....\.........\...\stm32f10x_iwdg.h
..................\....\.........\...\stm32f10x_pwr.h
..................\....\.........\...\stm32f10x_rcc.h
..................\....\.........\...\stm32f10x_rtc.h
..................\....\.........\...\stm32f10x_sdio.h
..................\....\.........\...\stm32f10x_spi.h
..................\....\.........\...\stm32f10x_tim.h
..................\....\.........\...\stm32f10x_usart.h
..................\....\.........\...\stm32f10x_wwdg.h
..................\....\.........\src\misc.c
..................\....\.........\...\stm32f10x_adc.c
..................\....\.........\...\stm32f10x_bkp.c
..................\....\.........\...\stm32f10x_can.c
..................\....\.........\...\stm32f10x_cec.c
..................\....\.........\...\stm32f10x_crc.c
..................\....\.........\...\stm32f10x_dac.c
..................\....\.........\...\stm32f10x_dbgmcu.c
..................\....\.........\...\stm32f10x_dma.c
..................\....\.........\...\stm32f10x_exti.c
..................\....\.........\...\stm32f10x_flash.c
..................\....\.........\...\stm32f10x_fsmc.c
..................\....\.........\...\stm32f10x_gpio.c
..................\....\.........\...\stm32f10x_i2c.c
..................\....\.........\...\stm32f10x_iwdg.c
..................\....\.........\...\stm32f10x_pwr.c
..................\....\.........\...\stm32f10x_rcc.c
..................\....\.........\...\stm32f10x_rtc.c
..................\....\.........\...\stm32f10x_sdio.c
..................\....\.........\...\stm32f10x_spi.c
..................\....\.........\...\stm32f10x_tim.c
..................\....\.........\...\stm32f10x_usart.c
..................\....\.........\...\stm32f10x_wwdg.c
..................\....\MyLibraries\mygpio.cpp
..................\....\...........\mygpio.h
..................\....\...........\mytim.cpp
..................\....\...........\mytim.h
..................\....\...........\myusart.cpp
..................\....\...........\myusart.h
..................\....\SIM\sim_command.cpp
..................\....\...\sim_command.h
..................\....\...\Sim_function.cpp
..................\....\...\Sim_function.h
..................\....\User\main.cpp
..................\....\....\malloc.h
..................\....\....\stm32f10x.h
..................\....\....\stm32f10x_conf.h
..................\....\....\stm32f10x_it.c
..................\....\....\stm32f10x_it.h
..................\....\....\system_stm32f10x.c
..................\....\....\system_stm32f10x.h
..................\Project\JLinkLog.txt
..................\.......\JLinkSettings.ini
..................\.......\Listing\startup_stm32f10x_md.lst
..................\.......\.......\Template.map
..................\.......\OutPut\core_cm3.crf
..................\.......\......\core_cm3.d

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