哈工大高級電工電子實驗報告

1、Harbin Institute of Technology課程報告課程名稱： 高級電子技術綜合實驗 院 系： 報 告 者： 學 號： 時 間： 2016-6-3 哈爾濱工業(yè)大學實驗一 basys2學習板的簡單應用一、實驗目的1.熟悉使用basys2學習板，了解FPGA的相關知識2.熟悉ISE軟件的應用3.使用basys2實現(xiàn)四人表決器的功能二、實驗步驟1.將板子與PC相連2.將寫好的程序燒錄板子中3.波動板子上的開關，進行實驗驗證三、相關代碼/ Verilog test fixture created from schematic D:Xilinx13.4exampletest5.26tes

2、t5.sch - Thu May 26 10:16:03 2016timescale 1ns / 1psmodule test5_test5_sch_tb();/ Inputs reg A; reg C; reg B; reg D;/ Output wire F;/ Bidirs/ Instantiate the UUT test5 UUT ( .A(A), .C(C), .B(B), .D(D), .F(F) );/ Initialize Inputs / ifdef auto_init initial begin A = 0; C = 0; B = 0; D = 0; #100; A =

3、0; C = 0; B = 0; D = 1; #100; A = 0; C = 0; B = 1; D = 0; #100; A = 0; C = 0; B = 1; D = 1; #100; A = 0; C = 1; B = 0; D = 0; #100; A = 0; C = 1; B = 0; D = 1; #100; A = 0; C = 1; B = 1; D = 0; #100; A = 0; C = 1; B = 1; D = 1; #100; A = 1; C = 0; B = 0; D = 0; #100; A = 1; C = 0; B = 0; D = 1; #100

4、; A = 1; C = 0; B = 1; D = 0; #100; A = 1; C = 0; B = 1; D = 1; #100; A = 1; C = 1; B = 0; D = 0; #100; A = 1; C = 1; B = 0; D = 1; #100; A = 1; C = 1; B = 1; D = 0; #100; A = 1; C = 1; B = 1; D = 1; #100; end / endifendmodule四、實驗現(xiàn)象A按下，BCD三個當中至少有一個也按下時，燈亮；A不按下，BCD都按下時，燈也亮，其他情況下燈不亮。實現(xiàn)了四人表決器的功能。實驗二 基于

5、basys2的流水燈設計實驗一、實驗目的1.熟悉使用basys2學習板，了解FPGA的相關知識2.熟悉ISE軟件的應用3.使用basys2實現(xiàn)流水燈的功能，并能控制燈的閃爍方法二、實驗步驟1.將板子與PC相連2.將寫好的程序燒錄板子中3.波動板子上的開關，進行實驗驗證三、相關代碼timescale 1ns / 1ps/ Company: / Engineer:/ / Create Date: 10:56:13 05/26/2016/ Design Name: / Module Name: TEST5-26LIUSHUIDENG / Project Name: / Target Devices:

6、/ Tool versions:/ Description: / Dependencies:/ Revision: / Revision 0.01 - File Created/ Additional Comments:/module TEST526LIUSHUIDENG( input clk, input rst, / input add, input oppose, output 7:0 led ); reg 23:0 cnt; reg 7:0 led_reg; reg 24:0 c; /reg add; /reg oppose; always (posedge clk) begin if

7、 (rst) cnt <= c; else cnt <= cnt+1; end always (posedge clk) begin if (rst) led_reg <= 8'b0000_0001; else if (cnt=c) if (oppose) begin led_reg <= led_reg >>2; if(led_reg = 8'b0000_0000) led_reg<=8'b1000_0000; end else begin led_reg <= led_reg <<1; if(led_reg

8、 = 8'b0000_0000) led_reg<=8'b0000_0001; end end assign led =led_reg;endmodule四、實驗現(xiàn)象燒錄程序后，basys學習板上的8個LED燈實現(xiàn)從右往左的循環(huán)閃爍。按下復位鍵，第一個LED燈亮，按下oppose鍵，燈從左往右循環(huán)，且沒間隔一個燈亮一次。實現(xiàn)了流水燈的功能。實驗三 恒流源+儀用放大與電橋+儀用放大測電阻的比較一、實驗目的1.理解并掌握恒流源的構成，電橋測電阻的原理及應用，儀表放大器的原理，-型ADC的原理與應用。2.掌握分立器件和集成器件的誤差計算，理解ADC的誤差分析，學習測量電路的誤差

9、計算。掌握I2C通訊協(xié)議。二、實驗步驟1.將Launchpad、液晶模塊和電阻測量模塊分別插到母板的三個空槽位；燒寫代碼。2.用跳線帽短接如所示的三個位置的插針；上電。3.將一只1k的電位器插在JP8的三個孔中；調節(jié)金色旋鈕；用萬用表的兩個表筆點測要接入的阻值；記錄萬用表讀數(shù)。4.將電位器插到JP4的三個孔中；要接入電阻的兩個腳分別對應JP4的2、3孔；觀察液晶顯示上INA所對應的值，記錄數(shù)據。5.將JP5、JP6上的跳線帽換插到2、3兩腳；將電位器插到JP3的三個孔中；要接入電阻的兩個腳分別對應JP3的2、3孔；觀察液晶顯示上INA所對應的值，記錄數(shù)據。三、相關代碼#ifndef TARGE

10、T_IS_BLIZZARD_RA1#define TARGET_IS_BLIZZARD_RA1#endif#ifndef PART_TM4C123GH6PM#define PART_TM4C123GH6PM#endif#include "stdint.h"#include "stdbool.h"#include "inc/hw_memmap.h"#include "inc/hw_types.h"#include "inc/hw_i2c.h"#include "inc/hw_ints.h

11、"#include "driverlib/interrupt.h"#include "driverlib/i2c.h"#include "driverlib/adc.h"#include "driverlib/sysctl.h"#include "driverlib/gpio.h"#include "driverlib/rom.h"#include "driverlib/rom_map.h"#include "driverlib/pin

12、_map.h"#include "LCDDriver.h"#define MIN_BRIDGE_ADC_VALUE1984/ 電橋測電阻的最大ADC顯示值#define MAX_BRIDGE_ADC_VALUE4095/ 電橋測電阻的最大ADC顯示值#define MAX_RESISTOR_VALUE203500/ 最大檢測電阻值，單位 m#define SLAVE_ADDRESS 0x48 / ADS1100數(shù)據寄存器地址#define SOURCE_OFFSET32768#define ADC_BASEADC0_BASE/ 使用ADC0#define Sequ

13、enceNum 3/ 使用序列3void Init_ADC_Detect()ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_ADC0);ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB);ROM_GPIOPinTypeADC(GPIO_PORTB_BASE, GPIO_PIN_4);ROM_ADCSequenceConfigure(ADC_BASE, SequenceNum, ADC_TRIGGER_PROCESSOR, 0);ROM_ADCSequenceStepConfigure(ADC_BASE, Sequen

14、ceNum, 0, ADC_CTL_CH10 | ADC_CTL_IE | ADC_CTL_END);ROM_ADCSequenceEnable(ADC_BASE, SequenceNum);ROM_ADCIntClear(ADC_BASE, SequenceNum);void Init_I2C_Comm()SysCtlPeripheralEnable(SYSCTL_PERIPH_I2C1);SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);GPIOPadConfigSet(GPIO_PORTA_BASE, GPIO_PIN_6 | GPIO_PIN_7,

15、 GPIO_STRENGTH_2MA, GPIO_PIN_TYPE_STD_WPU);GPIOPinConfigure(GPIO_PA6_I2C1SCL);GPIOPinConfigure(GPIO_PA7_I2C1SDA);GPIOPinTypeI2C(GPIO_PORTA_BASE, GPIO_PIN_6 | GPIO_PIN_7);GPIOPinTypeI2CSCL(GPIO_PORTA_BASE, GPIO_PIN_6);I2CMasterInitExpClk(I2C1_BASE, SysCtlClockGet(), false);I2CMasterEnable(I2C1_BASE);

16、void Configure_I2C()I2CMasterSlaveAddrSet(I2C1_BASE, SLAVE_ADDRESS, false);I2CMasterDataPut(I2C1_BASE,0x8C);I2CMasterControl(I2C1_BASE, I2C_MASTER_CMD_SINGLE_SEND);while(I2CMasterBusBusy(I2C1_BASE);uint32_t I2C_ADC_OpReg_MSB_i;/ 保存通過I2C讀取ADS1100的16位AD的高字節(jié)uint32_t I2C_ADC_OpReg_LSB_i;/ 保存通過I2C讀取ADS11

17、00的16位AD的高字節(jié)uint32_t I2C_ADC_ConfigReg_i;#define DELAY_6MS(SysCtlClockGet() / 3) / 150000void CatchI2C()I2CMasterSlaveAddrSet(I2C1_BASE, SLAVE_ADDRESS, true);I2CMasterControl(I2C1_BASE, I2C_MASTER_CMD_BURST_RECEIVE_START);while(I2CMasterBusy(I2C1_BASE);I2C_ADC_OpReg_MSB_i = I2CMasterDataGet(I2C1_BAS

18、E);I2CMasterControl(I2C1_BASE, I2C_MASTER_CMD_BURST_RECEIVE_CONT);while(I2CMasterBusy(I2C1_BASE);I2C_ADC_OpReg_LSB_i = I2CMasterDataGet(I2C1_BASE);I2CMasterControl(I2C1_BASE, I2C_MASTER_CMD_BURST_RECEIVE_FINISH);while(I2CMasterBusy(I2C1_BASE);I2C_ADC_ConfigReg_i = I2CMasterDataGet(I2C1_BASE);#define

19、 SAMPLE_NUM8int16_t sample_SourceSAMPLE_NUM; / 恒流源測電阻ADC采樣值unsigned int sample_BridgeSAMPLE_NUM; / 電橋測電阻ADC采樣值int16_t sample_Source_Average;uint32_t sample_Bridge_Average;intsample_Index;uint32_t temp1, temp2;char bit;uint16_t average;int16_t temp3;int main(void)bool bRefresh = false;uint32_t pui32A

20、DC0Value1;/ 保存ADC采樣值unsigned char number = '0'SysCtlClockSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_OSC | SYSCTL_OSC_MAIN |SYSCTL_XTAL_8MHZ);LCD_Enable();LCD_Init();LCD_ScreenClr();Init_ADC_Detect();LCD_Draw_Char('I', LINE_ONE, 0 * 8);LCD_Draw_Char('N', LINE_ONE, 1 * 8);LCD_Draw_Char(&

21、#39;A', LINE_ONE, 2 * 8);LCD_Draw_Char('3', LINE_ONE, 3 * 8);LCD_Draw_Char('3', LINE_ONE, 4 * 8);LCD_Draw_Char('3', LINE_ONE, 5 * 8);LCD_Draw_Char('M', LINE_ONE, 7 * 8);LCD_Draw_Char('e', LINE_ONE, 8 * 8);LCD_Draw_Char('a', LINE_ONE, 9 * 8);LCD_Dra

22、w_Char('s', LINE_ONE, 10 * 8);LCD_Draw_Char('u', LINE_ONE, 11 * 8);LCD_Draw_Char('r', LINE_ONE, 12 * 8);LCD_Draw_Char('e', LINE_ONE, 13 * 8);LCD_Draw_Char(':', LINE_ONE, 14 * 8);LCD_Draw_Char('V', LINE_TWO, 127-8);/ VLCD_Draw_Char('A', LINE_THR

23、EE, 0 * 8);LCD_Draw_Char('D', LINE_THREE, 1 * 8);LCD_Draw_Char('S', LINE_THREE, 2 * 8);LCD_Draw_Char('1', LINE_THREE, 3 * 8);LCD_Draw_Char('1', LINE_THREE, 4 * 8);LCD_Draw_Char('0', LINE_THREE, 5 * 8);LCD_Draw_Char('0', LINE_THREE, 6 * 8);LCD_Draw_Char

24、('M', LINE_THREE, 8 * 8);LCD_Draw_Char('e', LINE_THREE, 9 * 8);LCD_Draw_Char('a', LINE_THREE, 10 * 8);LCD_Draw_Char('s', LINE_THREE, 11 * 8);LCD_Draw_Char('u', LINE_THREE, 12 * 8);LCD_Draw_Char('r', LINE_THREE, 13 * 8);LCD_Draw_Char('e', LINE_T

25、HREE, 14 * 8);LCD_Draw_Char(':', LINE_THREE, 15 * 8-1);LCD_Draw_Char('V', LINE_FOUR, 127-8);/ VSysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOF);GPIOPinTypeGPIOOutput(GPIO_PORTF_BASE, GPIO_PIN_1);GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_1, GPIO_PIN_1);Init_I2C_Comm();/Configure_I2C();while(1

26、)ROM_SysCtlDelay(SysCtlClockGet() / 3 / 30);ADCProcessorTrigger(ADC_BASE, SequenceNum);while(!ADCIntStatus(ADC_BASE, SequenceNum, false)ADCIntClear(ADC_BASE, SequenceNum);ADCSequenceDataGet(ADC_BASE, SequenceNum, pui32ADC0Value);sample_Bridge_Average = (pui32ADC0Value0 * 3300) / 4096;CatchI2C();temp

27、1 = (I2C_ADC_OpReg_MSB_i & 0x000000FF) << 8 ;temp2 = (I2C_ADC_OpReg_LSB_i & 0x000000FF);temp3 = (int16_t)(temp1 + temp2);sample_Sourcesample_Index = temp3;if(sample_Index >= SAMPLE_NUM)bRefresh = true;sample_Index = 0;uint32_t total_Bridge = 0;int32_t total_Source = 0;int i = 0;for(

28、i = 0 ; i<SAMPLE_NUM; i+)total_Bridge += sample_Bridgei;total_Source += (int32_t)sample_Sourcei;sample_Source_Average = total_Source >> 3;total_Bridge = 0;total_Source = 0;elsesample_Index +;if(bRefresh)uint32_t temp = (int) sample_Bridge_Average;int i = 0 ;unsigned char data4 = 0;data0 = (

29、temp / 1000);data1 = (temp / 100) % 10;data2 = (temp / 10) % 10;data3 = (temp / 1) % 10;for(i = 0; i < 4; +i)LCD_Draw_Char('.', LINE_FOUR, 60 + 10 * 1);if(i < 1)LCD_Draw_Char(number + datai, LINE_TWO, 60 + 10 * i);elseLCD_Draw_Char(number + datai, LINE_TWO, 60 + 10 * (i + 1);uint32_t A

30、DC_temp = 0;bit = (sample_Source_Average & 0x8000) >> 15;average = sample_Source_Average + 1 ;ADC_temp = (uint32_t)(sample_Source_Average);uint32_t Vol_ads = (ADC_temp * 3300) / (16384 * 2);data0 = (Vol_ads / 1000);data1 = (Vol_ads / 100) % 10;data2 = (Vol_ads / 10) % 10;data3 = (Vol_ads /

31、 1) % 10;for( i = 0; i < 4; +i)LCD_Draw_Char('.', LINE_TWO, 60 + 10 * 1);if(i < 1)LCD_Draw_Char(number + datai, LINE_FOUR, 60 + 10 * i);elseLCD_Draw_Char(number + datai, LINE_FOUR, 60 + 10 * (i + 1);bRefresh = false;四、實驗現(xiàn)象1. 利用萬用表測得JP8阻值為774。2.利用儀用放大器和電橋法測出的IN2對應讀數(shù)如圖所示，經計算得待測電阻JP3阻值約為7

32、79。利用儀用放大器放大測阻法測出的IN1對應讀數(shù)如圖所示，經計算得待測電阻JP4阻值約為783。實驗四 TI學習套件電機驅動模塊的應用一、實驗目的1.理解掌握TI學習套件的使用2.了解電機驅動的相關知識3.學會使用ccs軟件編寫和燒入程序二、實驗步驟1.將Launchpad、液晶模塊和電機驅動模塊分別插到母板的三個空槽位；燒寫代碼。2.用跳線帽短接如所示的三個位置的插針；上電。3.旋轉液晶模塊上的圓盤，調節(jié)電機的轉速，記錄液晶顯示屏上電機轉速的大小。三、相關代碼/* * DC-Motor Driver Demo Application* All Rights Reserved. */*! *

33、 file main.c * version 1.0 * author Kai Zhang * date 2013-07-21 * brief DC-Motor_PWM_Tiva 生成1個PWM信號，驅動直流電機旋轉 * PB4 PB7其中一個為PWM信號，一個為高電平 * 按鍵PD6可以實現(xiàn)PB4和PB7的信號切換?？梢詫崿F(xiàn)電機的正轉反轉 * 可以通過滾輪調節(jié)PWM的占空比 占空比調節(jié)范圍 5 95 % * */#ifndef TARGET_IS_BLIZZARD_RA1#define TARGET_IS_BLIZZARD_RA1#endif#ifndef PART_TM4C123GH6PM

34、#define PART_TM4C123GH6PM#endif/* * PWM_Tiva 生成4個PWM信號， * 4個PWM 每路信號相位正好有90°的偏移。 * 四路PWM信號的占空比穩(wěn)定在25% * */#include <stdbool.h>#include <stdint.h>/#include "LCDDriver.h"#include "driverlib/rom.h"#include "driverlib/adc.h"#include "driverlib/sysctl.h&

35、quot;#include "driverlib/pwm.h"#include "driverlib/gpio.h"#include "driverlib/timer.h"#include "driverlib/pin_map.h"#include "driverlib/interrupt.h"#include "inc/hw_ints.h"#include "inc/hw_memmap.h"#include "LCDDriver.h"

36、#defineTIVA_MAIN_FREQUENCY12500000/* * 初始化ADC獲取滾輪電壓值 * |/|/M4 PE0|<-ADC模數(shù)轉換信號源/_| * */#define ADC_BASEADC0_BASE/ 使用ADC0#define SequenceNum 3/ 使用序列3void Init_ADCWheel()/ The ADC0 peripheral must be enabled for use.ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_ADC0);/ For this example ADC0 is used with

37、AIN0 on port E7.ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOE);/ Select the analog ADC function for these pins.ROM_GPIOPinTypeADC(GPIO_PORTE_BASE, GPIO_PIN_0);/ Enable sample sequence 3 with a processor signal trigger. Sequence 3ROM_ADCSequenceConfigure(ADC_BASE, SequenceNum, ADC_TRIGGER_PROCESSOR,

38、 0);/ Configure step 0 on sequence 3. Sample channel 0 (ADC_CTL_CH0) inROM_ADCSequenceStepConfigure(ADC_BASE, SequenceNum, 0, ADC_CTL_CH3 | ADC_CTL_IE | ADC_CTL_END);/ Since sample sequence 3 is now configured, it must be enabled.ROM_ADCSequenceEnable(ADC_BASE, SequenceNum);/ Clear the interrupt sta

39、tus flag. This is done to make sure theROM_ADCIntClear(ADC_BASE, SequenceNum);/* * 初始化PWM獲取兩組反響的脈寬調制信號 * |/| * M4 PB6|->M0PWM0-Channel 1 * M4 PB7|->M0PWM1/_| * */#define PERIOD_TIME12500 / 60 / 20K Hz/DC_motor/ 60K Hz DC Source/ 定義最大最小周期時間 頻率在2001000之間#define MAX_PERIODPERIOD_TIME * 90 / 100#d

40、efine MIN_PERIODPERIOD_TIME * 12 / 100void Init_PWM()/ 設置PWM時鐘和系統(tǒng)時鐘一致SysCtlPWMClockSet(SYSCTL_PWMDIV_1); / 使能PWM外設SysCtlPeripheralEnable(SYSCTL_PERIPH_PWM0);/ 使能外設端口SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB);/設置對應管腳的PWM信號功能GPIOPinConfigure(GPIO_PB4_M0PWM2);/設置PWM信號端口GPIOPinTypePWM(GPIO_PORTB_BASE,

41、GPIO_PIN_4);/PWM生成器配置PWMGenConfigure(PWM0_BASE, PWM_GEN_1, PWM_GEN_MODE_UP_DOWN | PWM_GEN_MODE_NO_SYNC);/設置PWM信號周期PWMGenPeriodSet(PWM0_BASE, PWM_GEN_1, PERIOD_TIME);/設置PWM信號占空比PWMPulseWidthSet(PWM0_BASE, PWM_OUT_2, PERIOD_TIME / 10);/ 使能PWM輸出端口PWMOutputState(PWM0_BASE, PWM_OUT_2_BIT, true);/ 使能PWM生成

42、器PWMGenEnable(PWM0_BASE, PWM_GEN_1);/ 使能PWm生成器模塊的及時功能.PWMSyncTimeBase(PWM0_BASE, PWM_GEN_1);bool director = true;void ChangeDirection()if(director)GPIOPinConfigure(GPIO_PB5_M0PWM3);GPIOPinTypePWM(GPIO_PORTB_BASE, GPIO_PIN_5);PWMPulseWidthSet(PWM0_BASE, PWM_OUT_3, PERIOD_TIME / 4);PWMOutputState(PWM0

43、_BASE, PWM_OUT_3_BIT, true);SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB);GPIOPinTypeGPIOOutput(GPIO_PORTB_BASE, GPIO_PIN_4);GPIOPinWrite(GPIO_PORTB_BASE, GPIO_PIN_4, GPIO_PIN_4);elseGPIOPinConfigure(GPIO_PB4_M0PWM2);GPIOPinTypePWM(GPIO_PORTB_BASE, GPIO_PIN_4);PWMPulseWidthSet(PWM0_BASE, PWM_OUT_2, PE

44、RIOD_TIME / 4);PWMOutputState(PWM0_BASE, PWM_OUT_2_BIT, true);SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB);GPIOPinTypeGPIOOutput(GPIO_PORTB_BASE, GPIO_PIN_5);GPIOPinWrite(GPIO_PORTB_BASE, GPIO_PIN_5, GPIO_PIN_5);/* * brief光耦信號觸發(fā)中斷函數(shù)響應，通過主頻和主頻計數(shù)差值換算出電機的轉速 * paramnull * return null */uint32_t old_tick

45、, cur_tick= 0;/ 記錄前次和當前的系統(tǒng)計數(shù)值用于鑒別中斷響應狀況uint32_t tick_delay = 0;/ 計算前后兩次中斷的時間間隔，用于計算電機葉輪的頻率float cur_frequency , old_frequency= 0.0;/ 記錄前次和當前的電機葉輪的頻率void Timer3AIntHandler(void) unsigned long ulstatus;/ 讀取中斷標志位ulstatus = TimerIntStatus(TIMER3_BASE, TIMER_CAPA_MATCH);if(ulstatus = TIMER_CAPA_MATCH)cur

46、_tick = ROM_SysTickValueGet();/ 清除中斷標志位TimerIntClear(TIMER3_BASE, ulstatus);/ 因為減計數(shù)會自動停止，所以需要重新啟用計數(shù)模塊TimerEnable(TIMER3_BASE, TIMER_A);/ 統(tǒng)計觸發(fā)次數(shù)/OpticalCount +;if(old_tick > cur_tick)tick_delay = old_tick - cur_tick;old_tick = cur_tick;/* * brief 頻率初始化Timer3A為邊沿觸發(fā)減計數(shù)，采用統(tǒng)計兩路光耦信號之間的時間差 * 來折算電機葉輪旋轉數(shù)度

47、 * paramnull * return null */void Init_Timer() / 啟用Timer4模塊SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER3);/ 啟用GPIO_M作為脈沖捕捉腳SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB);/ 配置GPIO腳為使用Timer4捕捉模式GPIOPinConfigure(GPIO_PB2_T3CCP0);GPIOPinTypeTimer(GPIO_PORTB_BASE, GPIO_PIN_2);/ 為管腳配置弱上拉模式GPIOPadConfigSet(GPIO_PORTB_BASE, GPIO_PIN_2, GPIO_STRENGTH_2MA, GPIO_PIN_TYPE_STD_WPU);/ 配置使用Timer4的TimerA模塊為邊沿觸發(fā)減計數(shù)模式TimerConfigure(TIMER3_BASE, TIMER_CFG_SPLIT_PAIR | TIMER_CFG_A_CAP_COUNT);/ 使用下降沿觸發(fā)TimerControlEvent(TIMER3_BA