stm32f103编程手册英文版中，常用词汇生成英文短文学习

短文1
Today I need to prepare a new firmware routine for an STM32F103 microcontroller. The goal is to trigger an LED when a button is pressed. However, we must not use simple polling because the CPU has many other tasks to handle. We will use an external interrupt line instead. First, I enable the clock for GPIO Port A and Port C through the RCC_APB2ENR register. Then, I configure PA0 as a floating input. The button is connected to this pin with an external pull-up resistor. Therefore, when the button is pressed, the pin level goes from high to low. We want to capture this falling edge. In the NVIC (Nested Vectored Interrupt Controller), we must enable the corresponding interrupt channel. The EXTI (External Interrupt/Event Controller) controller allows us to select the trigger condition. We set the falling edge sensitivity in the EXTI_FTSR register. We also unmask the specific line by writing to EXTI_IMR. Inside the interrupt service routine (ISR), we check the pending bit in the EXTI_PR register. If it is set, we know that the EXTI0 event has occurred. We then toggle the LED connected to PC13 by writing to the GPIOC_ODR register. After servicing the hardware, it is essential to clear the pending bit. Otherwise, the CPU will immediately re-enter the handler, causing an infinite loop. While the main program executes a delay loop or sleep mode (WFI instruction), the interrupt can wake up the core. This approach is efficient and saves power. The current consumption is significantly reduced compared to continuous polling. Finally, I compile the code and flash the device. The LED responds instantly to the button action.

(嵌入式贴合词汇)

• routine — "a new firmwareroutine"

• trigger — "totriggeran LED"

• handle — "tasks tohandle"

• external — "anexternalinterrupt"

• line — "interruptline"

• register — "RCC_APB2ENRregister"

• level — "pinlevelgoes from high to low"

• capture — "tocapturethis falling edge"

• falling — "fallingedge sensitivity"

• edge — "fallingedge"

• enable — "enablethe corresponding interrupt"

• channel — "interruptchannel"

• controller — "EXTIcontroller"

• unmask — "unmaskthe specific line"

• specific — "thespecificline"

• interrupt — "Inside theinterruptservice routine"

• service — "interruptserviceroutine"

• pending — "check thependingbit"

• bit — "pendingbit"

• event — "EXTI0eventhas occurred"

• toggle — "togglethe LED"

• servicing — "Afterservicingthe hardware"

• hardware — "servicing thehardware"

• clear — "clearthe pending bit"

• handler — "re-enter thehandler"

• infinite — "aninfiniteloop"

• loop — "loop"

• executes — "programexecutes"

• delay — "delayloop"

• sleep — "sleepmode"

• mode — "sleepmode"

• wake — "wakeup the core"

• core — "wake up thecore"

• compile — "Icompilethe code"

• flash — "flashthe device"
  
  

  (高频通用词汇)

• prepare — "I need toprepare"

• However — "However, we must not"

• instead — "instead"

• floating — "as afloatinginput"

• connected — "button isconnected"

• Therefore — "Therefore, when the button is pressed"

• high — "goes fromhighto low"

• corresponding — "thecorrespondinginterrupt"

• select — "allows us toselect"

• condition — "triggercondition"

• sensitivity — "edgesensitivity"

• occurred — "hasoccurred"

• essential — "it isessential"

• Otherwise — "Otherwise, the CPU"

• efficient — "isefficient"

• power — "savespower"

• current — "Thecurrentconsumption"

• significantly — "significantlyreduced"

• compared — "comparedto continuous"

• continuous — "compared tocontinuous"

• instantly — "respondsinstantly"

• action — "buttonaction"