STM32期末考試答案詳解.doc

簡述嵌套向量中斷控制器（NVIC）的主要特性。答：STM32的嵌套向量中斷控制器(NVIC) 管理著包括Cortex-M3核異常等中斷，其和ARM處理器核的接口緊密相連，可以實現(xiàn)低延遲的中斷處理，并有效地處理晚到的中斷。STM32嵌套向量中斷控制器(NVIC)的主要特性如下：q 具有43 個可屏蔽中斷通道（不包含16 個Cortex-M3 的中斷線）。 q 具有16 個可編程的優(yōu)先等級。 q 可實現(xiàn)低延遲的異常和中斷處理。 q 具有電源管理控制。 q 系統(tǒng)控制寄存器的實現(xiàn)。1簡述STM32的ADC系統(tǒng)的功能特性。答：STM32的ADC系統(tǒng)的主要功能特性包括如下幾個方面：ADC開關控制、ADC時鐘、ADC通道選擇、ADC的轉換模式、中斷、模擬看門狗、ADC的掃描模式、ADC的注入通道管理、間斷模式、ADC的校準模式、ADC的數(shù)據對齊、可編程的通道采樣時間、外部觸發(fā)轉換、DMA請求、雙ADC模式和溫度傳感器。2簡述STM32的雙ADC工作模式。答：在有兩個ADC的STM32器件中，可以使用雙ADC模式。在雙ADC模式里，根據ADC_CR1寄存器中DUALMOD2:0位所選的模式，轉換的啟動可以是ADC1主和ADC2從的交替觸發(fā)或同時觸發(fā)。雙ADC工作模式主要包括如下幾種：同時注入模式、同時規(guī)則模式、快速交替模式、慢速交替模式、交替觸發(fā)模式和獨立模式。1簡述STM32的USART的功能特點。、答：STM32的USART為通用同步異步收發(fā)器，其可以與使用工業(yè)標準NRZ異步串行數(shù)據格式的外部設備之間進行全雙工數(shù)據交換。USART還可以利用分數(shù)波特率發(fā)生器提供寬范圍的波特率選擇。STM32的USART支持同步單向通信和半雙工單線通信。同時，其也支持LIN(局部互連網)，智能卡協(xié)議和IrDA(紅外數(shù)據)SIR ENDEC規(guī)范，以及調制解調器(CTS/RTS)操作。STM32還具備多處理器通信能力。另外，通過多緩沖器配置的DMA方式，還可以實現(xiàn)高速數(shù)據通信。1簡述STM32的高級控制定時器TIM1的結構。答：STM32提供了一個高級控制定時器(TIM1)。TIM1由一個16位的自動裝載計數(shù)器組成，它由一個可編程預分頻器驅動。TIM1適合多種用途，包含測量輸入信號的脈沖寬度，或者產生輸出波形。使用定時器預分頻器和RCC時鐘控制預分頻器，可以實現(xiàn)脈沖寬度和波形周期從幾個微秒到幾個毫秒的調節(jié)。高級控制定時器TIM1和通用控制定時器TIMx是完全獨立的，它們不共享任何資源，因此可以同步操作。2簡述STM32時鐘的類型。答：STM32提供了三種不同的時鐘源，其都可被用來驅動系統(tǒng)時鐘SYSCLK，這三種時鐘源分別為：q HSI振蕩器時 q HSE振蕩器時鐘 q PLL時鐘這三種時鐘源還可以有以下2種二級時鐘源：q 32kHz低速內部RC，可以用于驅動獨立看門狗和RTC。其中，RTC用于從停機/待機模式下自動喚醒系統(tǒng)。q 32.768kHz低速外部晶振也可用來驅動RTC(RTCCLK)。任一個時鐘源都可被獨立地啟動或關閉，這樣可以通過關閉不使用的時鐘源來優(yōu)化整個系統(tǒng)的功耗。1簡述DMA控制器的基本功能。答：STM32的DMA 控制器有7個通道，每個通道專門用來管理來自于一個或多個外設對存儲器訪問的請求。還有一個仲裁器來協(xié)調各個DMA 請求的優(yōu)先權。DMA 控制器和Cortex-M3 核共享系統(tǒng)數(shù)據線執(zhí)行直接存儲器數(shù)據傳輸。因此，1 個DMA請求占用至少2 個周期的CPU 訪問系統(tǒng)總線時間。為了保證Cortex-M3 核的代碼執(zhí)行的最小帶寬，DMA 控制器總是在2 個連續(xù)的DMA 請求間釋放系統(tǒng)時鐘至少1 個周期。NVIC和外部中斷:配置中斷0（LED綠燈閃1次），中斷1（LED藍燈閃2次），中斷2三個中斷（LED綠燈閃3次），執(zhí)行順序為0-1-2。（默認中斷0閃爍的是綠燈）按下按鍵，綠燈閃(一亮一滅)1次，藍燈閃2次，然后綠燈閃3次，中斷結束。#include stm32l1xx.h#include stdio.h#include discover_board.h#include stm32l_discovery_lcd.h#include stdarg.h/* Private function prototypes -*/void RCC_Configuration(void);void Init_GPIOs (void);void Delay(uint32_t nTime);void USART_Configuration(void);void EXTI_Configuration(void);void NVIC_Configuration(void);static volatile uint32_t TimingDelay;int main(void) /* Configure Clocks for Application need */ RCC_Configuration();SysTick_Config(16000000/ 2000);NVIC_Configuration(); /* Init I/O ports */ Init_GPIOs(); USART_Configuration();EXTI_Configuration();/printf(rnWelcome !rn); while(1) /Delay(20); /printf(rnWelcome !rn); void RCC_Configuration(void) RCC_DeInit(); /* Enable HSI Clock */ RCC_HSICmd(ENABLE); /*! Wait till HSI is ready */ while (RCC_GetFlagStatus(RCC_FLAG_HSIRDY) = RESET) /*RCC_PLLCmd(DISABLE);RCC_PLLConfig(RCC_PLLSource_HSI,RCC_PLLMul_3,RCC_PLLDiv_2);RCC_PLLCmd(ENABLE); */ /*! Wait till PLL is ready */ / while (RCC_GetFlagStatus(RCC_FLAG_PLLRDY) = RESET) / /RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK); RCC_SYSCLKConfig(RCC_SYSCLKSource_HSI); RCC_MSIRangeConfig(RCC_MSIRange_6); RCC_HSEConfig(RCC_HSE_OFF); if(RCC_GetFlagStatus(RCC_FLAG_HSERDY) != RESET ) while(1); /* Enable comparator clock LCD and PWR mngt */ /RCC_APB1PeriphClockCmd(RCC_APB1Periph_LCD | RCC_APB1Periph_PWR, ENABLE); /* Enable ADC clock & SYSCFG */ RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1 | RCC_APB2Periph_SYSCFG | RCC_APB2Periph_USART1 , ENABLE);void Init_GPIOs (void) GPIO_InitTypeDef GPIO_InitStructure; /* Enable GPIOs clock */ RCC_AHBPeriphClockCmd(LD_GPIO_PORT_CLK|USERBUTTON_GPIO_CLK, ENABLE);/* Configure User Button pin as input */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2;/USERBUTTON_GPIO_PIN GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_40MHz; GPIO_Init(USERBUTTON_GPIO_PORT, &GPIO_InitStructure); /* Configure the GPIO_LED pins LD3 & LD4*/ GPIO_InitStructure.GPIO_Pin = LD_GREEN_GPIO_PIN | LD_BLUE_GPIO_PIN; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT; GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz; GPIO_Init(LD_GPIO_PORT, &GPIO_InitStructure); /GPIO_LOW(LD_GPIO_PORT, LD_GREEN_GPIO_PIN); /GPIO_LOW(LD_GPIO_PORT, LD_BLUE_GPIO_PIN);/*Configure the USART1_GPIO_PORT */ /* Connect PA9 to USART1_Tx */ GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_USART1); /* Connect PA10 to USART1_Rx*/ GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_USART1); /* Configure USART1_Tx and USART1_Rx as alternate function */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_40MHz; GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; GPIO_Init(GPIOA, &GPIO_InitStructure);/* Enable all GPIOs clock */ RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA | RCC_AHBPeriph_GPIOB | RCC_AHBPeriph_GPIOC | RCC_AHBPeriph_GPIOD | RCC_AHBPeriph_GPIOE | RCC_AHBPeriph_GPIOH, ENABLE); void USART_Configuration(void)USART_InitTypeDef USART_InitStructure;USART_ClockInitTypeDef USART_ClockIni;USART_InitStructure.USART_BaudRate = 9600; USART_InitStructure.USART_WordLength = USART_WordLength_8b; USART_InitStructure.USART_StopBits = USART_StopBits_1; USART_InitStructure.USART_Parity = USART_Parity_No ; USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; USART_Init(USART1,&USART_InitStructure);USART_ClockIni.USART_Clock = USART_Clock_Disable; USART_ClockIni.USART_CPOL = USART_CPOL_Low; USART_ClockIni.USART_CPHA = USART_CPHA_2Edge; USART_ClockIni.USART_LastBit = USART_LastBit_Disable;USART_ClockInit(USART1,&USART_ClockIni);USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);USART_Cmd(USART1,ENABLE)void EXTI_Configuration()EXTI_InitTypeDef EXTI_InitStructure;/定義PA0,PA1,PA2為外部中斷輸入通道/ SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA,EXTI_PinSource0);SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA,EXTI_PinSource1);SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA,EXTI_PinSource2);/* Configure EXT1 Line 0 1 2 in interrupt mode trigged on Falling edge */ EXTI_InitStructure.EXTI_Line = EXTI_Line0|EXTI_Line1|EXTI_Line2 ; / PA0 for User button EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling; EXTI_InitStructure.EXTI_LineCmd = ENABLE; EXTI_Init(&EXTI_InitStructure);void NVIC_Configuration()NVIC_InitTypeDef NVIC_InitStructure; #ifdef VECT_TAB_RAM /C/C+ CompilerPreprocessorDefined symbolsVECT_TAB_RAM NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0); /RAM #else /VECT_TAB_RAM NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);/Flash #endif /NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);/* Enable and set EXTI0 Interrupt to the lowest priority */ NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn ; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); NVIC_InitStructure.NVIC_IRQChannel = EXTI1_IRQn ; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); NVIC_InitStructure.NVIC_IRQChannel = EXTI2_IRQn ; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); void Delay(uint32_t nTime) TimingDelay = nTime; while(TimingDelay != 0);void TimingDelay_Decrement(void) if (TimingDelay != 0x00) TimingDelay-; int fputc(int ch,FILE *f)USART_SendData(USART1,(unsigned char)ch);while(USART_GetFlagStatus(USART1,USART_FLAG_TC)=RESET);return ch;#include stm32l1xx_it.h#include main.hvoid NMI_Handler(void)void HardFault_Handler(void) /* Go to infinite loop when Hard Fault exception occurs */ while (1) void MemManage_Handler(void) /* Go to infinite loop when Memory Manage exception occurs */ while (1) void BusFault_Handler(void)/* Go to infinite loop when Bus Fault exception occurs */ while (1) void UsageFault_Handler(void) /* Go to infinite loop when Usage Fault exception occurs */ while (1) void SVC_Handler(void)void DebugMon_Handler(void)void PendSV_Handler(void)void SysTick_Handler(void) TimingDelay_Decrement();void DMA1_Channel1_IRQHandler (void)void RTC_WKUP_IRQHandler(void)void EXTI0_IRQHandler(void)int i;GPIO_TOGGLE(LD_GPIO_PORT ,LD_GREEN_GPIO_PIN );for(i=0;i500000;i+)GPIO_TOGGLE(LD_GPIO_PORT ,LD_GREEN_GPIO_PIN );for(i=0;i500000;i+)EXTI_GenerateSWInterrupt(EXTI_Line1);EXTI_ClearFlag(EXTI_Line0);void EXTI1_IRQHandler(void)int i;GPIO_TOGGLE(LD_GPIO_PORT ,LD_BLUE_GPIO_PIN );for(i=0;i500000;i+)GPIO_TOGGLE(LD_GPIO_PORT ,LD_BLUE_GPIO_PIN );for(i=0;i500000;i+)GPIO_TOGGLE(LD_GPIO_PORT ,LD_BLUE_GPIO_PIN );for(i=0;i500000;i+)GPIO_TOGGLE(LD_GPIO_PORT ,LD_BLUE_GPIO_PIN );for(i=0;i500000;i+)EXTI_GenerateSWInterrupt(EXTI_Line2);EXTI_ClearFlag(EXTI_Line1);void EXTI2_IRQHandler(void)int i;GPIO_TOGGLE(LD_GPIO_PORT ,LD_GREEN_GPIO_PIN );for(i=0;i500000;i+)GPIO_TOGGLE(LD_GPIO_PORT ,LD_GREEN_GPIO_PIN );for(i=0;i500000;i+)GPIO_TOGGLE(LD_GPIO_PORT ,LD_GREEN_GPIO_PIN );for(i=0;i500000;i+)GPIO_TOGGLE(LD_GPIO_PORT ,LD_GREEN_GPIO_PIN );for(i=0;i500000;i+)GPIO_TOGGLE(LD_GPIO_PORT ,LD_GREEN_GPIO_PIN );for(i=0;i500000;i+)GPIO_TOGGLE(LD_GPIO_PORT ,LD_GREEN_GPIO_PIN );for(i=0;i500000;i+)EXTI_ClearFlag(EXTI_Line2);/*void PPP_IRQHandler(void) */ * （配置的兩個定時器通道的中斷請求的時間間隔分別為1秒和2秒）紅紅每隔1秒閃爍1次，綠燈每隔2秒閃爍1次。#include stm32l1xx.h#include stdio.h/* 自定義同義關鍵字 -*/* 自定義參數(shù)宏 -*/* 自定義函數(shù)宏 -*/* 自定義變量 -*/uint16_t CCR1_Val =2500; /*初始化輸出比較通道1計數(shù)周期變量*/uint16_t CCR1_Val =5000;uint16_t CCR2_Val =1250; /*/uint16_t CCR2_Val =2500; /*/uint16_t CCR3_Val =10000; /*/uint16_t CCR4_Val =5000; /*/* 自定義函數(shù)聲明 -*/void RCC_Configuration(void);void GPIO_Configuration(void);void NVIC_Configuration(void);void TIM_Configuration(void);* 函數(shù)名 : main* 函數(shù)描述 : 主函數(shù)* 輸入參數(shù) : 無int main(void) /* 設置系統(tǒng)時鐘 */ RCC_Configuration();/* 設置NVIC */ NVIC_Configuration();/* 設置GPIO端口 */ GPIO_Configuration();/* 設置 TIM */ TIM_Configuration(); while (1);* 函數(shù)名: RCC_Configuration* 函數(shù)描述 : 設置系統(tǒng)各部分時鐘* 輸入參數(shù) : 無void RCC_Configuration(void)/* 定義枚舉類型變量 HSEStartUpStatus */ErrorStatus HSEStartUpStatus; /* 復位系統(tǒng)時鐘設置*/ RCC_DeInit(); /* 開啟HSE*/ RCC_HSEConfig(RCC_HSE_ON); /* 等待HSE起振并穩(wěn)定*/ HSEStartUpStatus = RCC_WaitForHSEStartUp();/* 判斷HSE起是否振成功，是則進入if()內部 */ if(HSEStartUpStatus = SUCCESS) /* 選擇HCLK（AHB）時鐘源為SYSCLK 1分頻 */ RCC_HCLKConfig(RCC_SYSCLK_Div1); /* 選擇PCLK2時鐘源為 HCLK（AHB） 1分頻 */ RCC_PCLK2Config(RCC_HCLK_Div1); /* 選擇PCLK1時鐘源為 HCLK（AHB） 2分頻 */ RCC_PCLK1Config(RCC_HCLK_Div2); /* 設置FLASH延時周期數(shù)為2 */ FLASH_SetLatency(FLASH_Latency_1); /* 使能FLASH預取緩存 */ FLASH_PrefetchBufferCmd(ENABLE); /* 選擇鎖相環(huán)（PLL）時鐘源為HSE 2分頻，倍頻數(shù)為8，則PLL輸出頻率為 8MHz * 4 = 32MHz */ RCC_PLLConfig(RCC_PLLSource_HSE, RCC_PLLMul_8,RCC_PLLDiv_2); /* 使能PLL */ RCC_PLLCmd(ENABLE); /* 等待PLL輸出穩(wěn)定 */ while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) = RESET); /* 選擇SYSCLK時鐘源為PLL */ RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK); /* 等待PLL成為SYSCLK時鐘源 */ while(RCC_GetSYSCLKSource() != 0x08); /* 打開APB2總線上的GPIOA時鐘*/RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB , ENABLE); * 函數(shù)名 : GPIO_Configuration* 函數(shù)描述 : 設置各GPIO端口功能void GPIO_Configuration(void)/* 定義GPIO初始化結構體 GPIO_InitStructure */ GPIO_InitTypeDef GPIO_InitStructure; /* 設置PA.0,PA.1,PA.2為浮空輸入（EXTI Line0）*/ GPIO_InitStructure.GPIO_Pin =GPIO_Pin_6|GPIO_Pin_7; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_40MHz; GPIO_Init(GPIOB , &GPIO_InitStructure);* 函數(shù)名 : NVIC_Configuration* 函數(shù)描述 : 設置NVIC參數(shù)void TIM_Configuration(void)/*定襎IM_TimeBase初始化結構體?/TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;/*定義TIM_OCInit初始化結構體*/TIM_OCInitTypeDef TIM_OCInitStructure;/*技術重載值為65535，預分頻值為16000，時鐘分割0，向上計數(shù)模式*/TIM_TimeBaseStructure.TIM_Period=65535;TIM_TimeBaseStructure.TIM_Prescaler= 0;TIM_TimeBaseStructure.TIM_ClockDivision=0;TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;TIM_TimeBaseInit(TIM2,&TIM_TimeBaseStructure);/*設置預分頻值，立即裝入*/TIM_PrescalerConfig(TIM2,3199,TIM_PSCReloadMode_Immediate);/*設置OC1，OC2通道，工作模式為計數(shù)器模式，使能比較匹配輸出極性，時鐘分割0，向上計數(shù)模式*/TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_Timing;TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_High;TIM_OCInitStructure.TIM_Pulse=CCR1_Val;TIM_OC1Init(TIM2,&TIM_OCInitStructure);TIM_OCInitStructure.TIM_Pulse=CCR2_Val;TIM_OC2Init(TIM2,&TIM_OCInitStructure);/*TIM_OCInitStructure.TIM_Pulse=CCR3_Val;TIM_OC3Init(TIM2,&TIM_OCInitStructure);TIM_OCInitStructure.TIM_Pulse=CCR4_Val;TIM_OC4Init(TIM2,&TIM_OCInitStructure);*/*禁止預裝載寄存器*/TIM_OC1PreloadConfig(TIM2,TIM_OCPreload_Disable);TIM_OC2PreloadConfig(TIM2,TIM_OCPreload_Disable);/TIM_OC3PreloadConfig(TIM2,TIM_OCPreload_Disable);/TIM_OC4PreloadConfig(TIM2,TIM_OCPreload_Disable);/*使能TIM中斷*/TIM_ITConfig(TIM2,TIM_IT_CC1 | TIM_IT_CC2,ENABLE );/*啟動TIM計數(shù)*/TIM_Cmd(TIM2,ENABLE);* 函數(shù)名 : NVIC_Configuration* 函數(shù)描述 : 設置NVIC參數(shù)void NVIC_Configuration(void)/* 定義NVIC初始化結構體 NVIC_InitStructure */NVIC_InitTypeDef NVIC_InitStructure;/* #ifdef.#else.#endif結構的作用是根據預編譯條件決定中斷向量表起始地址*/ #ifdef VECT_TAB_RAM /* 中斷向量表起始地址從 0x20000000 開始 */ NVIC_SetVectorTable(NVIC_VectTab_RAM , 0x0); #else /* VECT_TAB_FLASH */ /* 中斷向量表起始地址從 0x80000000 開始 */ NVIC_SetVectorTable(NVIC_VectTab_FLASH , 0x0); #endif /* 選擇NVIC優(yōu)先級分組2 */ NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0); /* 使能EXIT 0通道 ，2級先占優(yōu)先級 ，0級次占優(yōu)先級 */ NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure);#include stm32l1xx_it.h#include stdio.hextern uint16_t CCR1_Val; /*聲明輸出比較通道1計數(shù)周期變量*/extern uint16_t CCR2_Val;extern uint16_t CCR3_Val;extern uint16_t CCR4_Val;void NMI_Handler(void)void HardFault_Handler(void) /* Go to infinite loop when Hard Fault exception occurs */ while (1) void MemManage_Handler(void) /* Go to infinite loop when Memory Manage exception occurs */ while (1) void BusFault_Handler(void) /* Go to infinite loop when Bus Fault exception occurs */ while (1) void UsageFault_Handler(void) /* Go to infinite loop when Usage Fault exception occurs */ while (1) void SVC_Handler(void)void DebugMon_Handler(void)void PendSV_Handler(void)void SysTick_Handler(void) / TimingDelay_Decrement();void DMA1_Channel1_IRQHandler (void)void RTC_WKUP_IRQHandler(void)void TIM2_IRQHandler(void)uint16_t capture=0;/*當前捕獲計數(shù)值局部變量*/*TIM時鐘=32M，分頻數(shù)=1599+1，TIM2 counter clock=10khz CC1更新率=TIM2counter clock/CCRX_Val*/if(TIM_GetITStatus(TIM2,TIM_IT_CC1)!=RESET)GPIO_WriteBit(GPIOB,GPIO_Pin_6,(BitAction)(1-GPIO_ReadOutputDataBit(GPIOB,GPIO_Pin_6);/*讀出當前計數(shù)值*/capture=TIM_GetCapture1(TIM2);/*根據當前計數(shù)值更新輸出捕獲寄存器*/TIM_SetCompare1(TIM2,capture+CCR1_Val);TIM_ClearITPendingBit(TIM2,TIM_IT_CC1);else if(TIM_GetITStatus(TIM2,TIM_IT_CC2)!=RESET)GPIO_WriteBit(GPIOB,GPIO_Pin_7,(BitAction)(1-GPIO_ReadOutputDataBit(GPIOB,GPIO_Pin_7);capture=TIM_GetCapture2(TIM2);TIM_SetCompare2(TIM2,capture+CCR2_Val);TIM_ClearITPendingBit(TIM2,TIM_IT_CC2);/else if(TIM_GetITStatus(TIM2,TIM_IT_CC3)!=RESET)/GPIO_WriteBit(GPIOA,GPIO_Pin_6,(BitAction)(1-GPIO_ReadOutputDataBit(GPIOA,GPIO_Pin_6);/capture=TIM_GetCapture3(TIM2);/TIM_SetCompare3(TIM2,capture+CCR3_Val);/TIM_ClearITPendingBit(TIM2,TIM_IT_CC3);/else if(TIM_GetITStatus(TIM2,TIM_IT_CC4)!=RESET)/GPIO_WriteBit(GPIOA,GPIO_Pin_7,(BitAction)(1-GPIO_ReadOutputDataBit(GPIOA,GPIO_Pin_7);/capture=TIM_GetCapture4(TIM2);/TIM_SetCompare4(TIM2,capture+CCR4_Val);/TIM_ClearITPendingBit(TIM2,TIM_IT_CC4);/ * 按鍵按一下，LED3和LED4燈亮，松開按鍵，再次按下按鍵，LED3和LED4燈滅。* 使用GPIO和SysTick定時器實現(xiàn)按鍵掃描*/ #include stm32l1xx.h#include stdio.h#include discover_board.h#include stm32l_discovery_lcd.h/* Private function prototypes */void RCC_Configuration(void);/*系統(tǒng)時鐘設置*/void Init_GPIOs (void);/*GPIO端口設置*/void Delay(uint32_t nTime);static volatile uint