利用STM32的tim3实现4路pwm输出控制步进电机

利用stm32的tim3实现4路pwm输出控制步进电机，占空比一定，周期可调，从而实现电机调速

4路步进电机pwm_stm32\Lib
....................\...\cmsis
....................\...\.....\core_cm3.c
....................\...\.....\core_cm3.h
....................\...\.....\stm32f10x.h
....................\...\.....\system_stm32f10x.h
....................\...\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
....................\...\startup
....................\...\.......\arm
....................\...\.......\...\startup_stm32f10x_cl.s
....................\...\.......\...\startup_stm32f10x_hd.s
....................\...\.......\...\startup_stm32f10x_hd_vl.s
....................\...\.......\...\startup_stm32f10x_ld.s
....................\...\.......\...\startup_stm32f10x_ld_vl.s
....................\...\.......\...\startup_stm32f10x_md.s
....................\...\.......\...\startup_stm32f10x_md_vl.s
....................\...\.......\...\startup_stm32f10x_xl.s
....................\MDK_Project
....................\...........\List
....................\...........\....\Project.map
....................\...........\....\startup_stm32f10x_hd.lst
....................\...........\Out
....................\...........\...\core_cm3.crf
....................\...........\...\core_cm3.d
....................\...........\...\core_cm3.o
....................\...........\...\main.crf
....................\...........\...\main.d
....................\...........\...\main.o
....................\...........\...\misc.crf
....................\...........\...\misc.d
....................\...........\...\misc.o
....................\...........\...\Project.axf
....................\...........\...\Project.hex
....................\...........\...\Project.htm
....................\...........\...\Project.lnp
....................\...........\...\Project.plg
....................\...........\...\Project.sct
....................\...........\...\Project.tra
....................\...........\...\startup_stm32f10x_hd.d
....................\...........\...\startup_stm32f10x_hd.o
....................\...........\...\stm32f10x_adc.crf
....................\...........\...\stm32f10x_adc.d
....................\...........\...\stm32f10x_adc.o
....................\...........\...\stm32f10x_gpio.crf
....................\...........\...\stm32f10x_gpio.d
....................\...........\...\stm32f10x_gpio.o
....................\...........\...\stm32f10x_i2c.crf
....................\...........\...\stm32f10x_i2c.d
....................\...........\...\stm32f10x_i2c.o
....................\...........\...\stm32f10x_it.crf
....................\...........\...\stm32f10x_it.d
....................\...........\...\stm32f10x_it.o
....................\...........\...\stm32f10x_rcc.crf