python做网站吗,上海企业建站流程,设计杂志官网,网站免费源码大全无需下载目录1.通过Timer_A_outputPWM配置产生PWM波初始化函数计算修改占空比的函数整体程序效果2.单定时器产生多路PWM信号初始化函数实验结果3.对称PWM信号的产生初始化程序实验结果平台#xff1a;Code Composer Studio 10.3.1 MSP430F5529 LaunchPad™ Development Kit (MSP‑EX…
目录1.通过Timer_A_outputPWM配置产生PWM波初始化函数计算修改占空比的函数整体程序效果2.单定时器产生多路PWM信号初始化函数实验结果3.对称PWM信号的产生初始化程序实验结果平台Code Composer Studio 10.3.1 MSP430F5529 LaunchPad™ Development Kit (MSP‑EXP430F5529LP) 1.通过Timer_A_outputPWM配置产生PWM波
所选输出引脚为P1.2
初始化函数
#define TIMER_PERIOD 12500
void Timer_A_PWM_Init(void)
{Timer_A_outputPWMParam htim {0};//P1.2复用输出GPIO_setAsPeripheralModuleFunctionOutputPin(GPIO_PORT_P1, GPIO_PIN2); //时钟源选为SMCLK 25MHzhtim.clockSource TIMER_A_CLOCKSOURCE_SMCLK; //分频系数设为40htim.clockSourceDivider TIMER_A_CLOCKSOURCE_DIVIDER_40;//装载值设为12500 - 1htim.timerPeriod TIMER_PERIOD - 1;//P1.2 对应 TA0.1 故设为TIMER_A_CAPTURECOMPARE_REGISTER_1htim.compareRegister TIMER_A_CAPTURECOMPARE_REGISTER_1;htim.compareOutputMode TIMER_A_OUTPUTMODE_RESET_SET;//初始比较值为装载值的一半 即初始占空比为50%htim.dutyCycle TIMER_PERIOD / 2;//P1.2 对应 TA0.1 为TIMER_A0_BASETimer_A_outputPWM(TIMER_A0_BASE, htim);
}计算
时钟源为SMCLK 25MHz 分频系数为40 装载值为12500 - 1 故所得PWM频率为25MHz/40/1250050Hz
修改占空比的函数
修改占空比即修改比较值故使用Timer_A_setCompareValue函数
我选择在外部中断服务函数内进行修改按下一次按钮分别为占空比减少10%和增加10%
//******************************************************************************
//
//This is the PORT2_VECTOR interrupt vector service routine
//
//******************************************************************************
#pragma vectorPORT2_VECTOR // P2口中断源
__interrupt
void Port_2 (void) // 声明一个中断服务程序名为Port_2()
{if(GPIO_getInterruptStatus(GPIO_PORT_P2, GPIO_PIN1)){delay_ms(20);if(!GPIO_getInputPinValue(GPIO_PORT_P2, GPIO_PIN1)){//P1.0 toggleTimer_A_setCompareValue(TIMER_A0_BASE,TIMER_A_CAPTURECOMPARE_REGISTER_1,Timer_A_getCaptureCompareCount(TIMER_A0_BASE, TIMER_A_CAPTURECOMPARE_REGISTER_1) - TIMER_PERIOD / 10);while(!GPIO_getInputPinValue(GPIO_PORT_P2, GPIO_PIN1));}//P2.1 IFG clearedGPIO_clearInterrupt(GPIO_PORT_P2, GPIO_PIN1);}
}//******************************************************************************
//
//This is the PORT1_VECTOR interrupt vector service routine
//
//******************************************************************************
#pragma vectorPORT1_VECTOR // P2口中断源
__interrupt
void Port_1 (void) // 声明一个中断服务程序名为Port_1()
{if(GPIO_getInterruptStatus(GPIO_PORT_P1, GPIO_PIN1)){delay_ms(20);if(!GPIO_getInputPinValue(GPIO_PORT_P1, GPIO_PIN1)){//P1.0 toggleTimer_A_setCompareValue(TIMER_A0_BASE,TIMER_A_CAPTURECOMPARE_REGISTER_1,Timer_A_getCaptureCompareCount(TIMER_A0_BASE, TIMER_A_CAPTURECOMPARE_REGISTER_1) TIMER_PERIOD / 10);while(!GPIO_getInputPinValue(GPIO_PORT_P1, GPIO_PIN1));}//P2.1 IFG clearedGPIO_clearInterrupt(GPIO_PORT_P1, GPIO_PIN1);}
}整体程序
#include driverlib.h#define MCLK_IN_HZ 25000000#define delay_us(x) __delay_cycles((MCLK_IN_HZ/1000000*(x)))
#define delay_ms(x) __delay_cycles((MCLK_IN_HZ/1000*(x)))void SystemClock_Init(void)
{PMM_setVCore(PMM_CORE_LEVEL_3); //高主频工作需要较高的核心电压//XT1引脚复用GPIO_setAsPeripheralModuleFunctionInputPin(GPIO_PORT_P5, GPIO_PIN4);GPIO_setAsPeripheralModuleFunctionOutputPin(GPIO_PORT_P5, GPIO_PIN5);//起振XT1UCS_turnOnLFXT1(UCS_XT1_DRIVE_3,UCS_XCAP_3);//XT2引脚复用GPIO_setAsPeripheralModuleFunctionInputPin(GPIO_PORT_P5, GPIO_PIN2);GPIO_setAsPeripheralModuleFunctionOutputPin(GPIO_PORT_P5, GPIO_PIN3);//起振XT2UCS_turnOnXT2(UCS_XT2_DRIVE_4MHZ_8MHZ);//XT2作为FLL参考时钟先8分频再50倍频 4MHz / 8 * 50 25MHzUCS_initClockSignal(UCS_FLLREF, UCS_XT2CLK_SELECT, UCS_CLOCK_DIVIDER_8);UCS_initFLLSettle(25000, 50);//XT1作为ACLK时钟源 32768HzUCS_initClockSignal(UCS_ACLK, UCS_XT1CLK_SELECT, UCS_CLOCK_DIVIDER_1);//DCOCLK作为MCLK时钟源 25MHzUCS_initClockSignal(UCS_MCLK, UCS_DCOCLK_SELECT, UCS_CLOCK_DIVIDER_1);//DCOCLK作为SMCLK时钟源 25MHzUCS_initClockSignal(UCS_SMCLK, UCS_DCOCLK_SELECT, UCS_CLOCK_DIVIDER_1);//设置外部时钟源的频率使得在调用UCS_getMCLK, UCS_getSMCLK 或 UCS_getACLK时可得到正确值UCS_setExternalClockSource(32768, 4000000);
}#define TIMER_PERIOD 12500
void Timer_A_PWM_Init(void)
{Timer_A_outputPWMParam htim {0};GPIO_setAsPeripheralModuleFunctionOutputPin(GPIO_PORT_P1, GPIO_PIN2);htim.clockSource TIMER_A_CLOCKSOURCE_SMCLK;htim.clockSourceDivider TIMER_A_CLOCKSOURCE_DIVIDER_40;htim.timerPeriod TIMER_PERIOD - 1;htim.compareRegister TIMER_A_CAPTURECOMPARE_REGISTER_1;htim.compareOutputMode TIMER_A_OUTPUTMODE_RESET_SET;htim.dutyCycle TIMER_PERIOD / 2;Timer_A_outputPWM(TIMER_A0_BASE, htim);
}void KEY_S1_Init(void)
{GPIO_setAsInputPinWithPullUpResistor(GPIO_PORT_P2, GPIO_PIN1);//P2.1 interrupt enabledGPIO_enableInterrupt(GPIO_PORT_P2, GPIO_PIN1); //使能中断//P2.1 Hi/Lo edgeGPIO_selectInterruptEdge(GPIO_PORT_P2, GPIO_PIN1, GPIO_HIGH_TO_LOW_TRANSITION); //设置中断类型//P2.1 IFG clearedGPIO_clearInterrupt(GPIO_PORT_P2, GPIO_PIN1); //清除中断标志位
}void KEY_S2_Init(void)
{GPIO_setAsInputPinWithPullUpResistor(GPIO_PORT_P1, GPIO_PIN1);//P2.1 interrupt enabledGPIO_enableInterrupt(GPIO_PORT_P1, GPIO_PIN1); //使能中断//P2.1 Hi/Lo edgeGPIO_selectInterruptEdge(GPIO_PORT_P1, GPIO_PIN1, GPIO_HIGH_TO_LOW_TRANSITION); //设置中断类型//P2.1 IFG clearedGPIO_clearInterrupt(GPIO_PORT_P1, GPIO_PIN1); //清除中断标志位
}int main(void)
{WDT_A_hold(WDT_A_BASE);SystemClock_Init();Timer_A_PWM_Init();KEY_S1_Init();KEY_S2_Init();//interrupts enabled__bis_SR_register(GIE);while(1){}
}//******************************************************************************
//
//This is the PORT2_VECTOR interrupt vector service routine
//
//******************************************************************************
#pragma vectorPORT2_VECTOR // P2口中断源
__interrupt
void Port_2 (void) // 声明一个中断服务程序名为Port_2()
{if(GPIO_getInterruptStatus(GPIO_PORT_P2, GPIO_PIN1)){delay_ms(20);if(!GPIO_getInputPinValue(GPIO_PORT_P2, GPIO_PIN1)){//P1.0 toggleTimer_A_setCompareValue(TIMER_A0_BASE,TIMER_A_CAPTURECOMPARE_REGISTER_1,Timer_A_getCaptureCompareCount(TIMER_A0_BASE, TIMER_A_CAPTURECOMPARE_REGISTER_1) - TIMER_PERIOD / 10);while(!GPIO_getInputPinValue(GPIO_PORT_P2, GPIO_PIN1));}//P2.1 IFG clearedGPIO_clearInterrupt(GPIO_PORT_P2, GPIO_PIN1);}
}//******************************************************************************
//
//This is the PORT1_VECTOR interrupt vector service routine
//
//******************************************************************************
#pragma vectorPORT1_VECTOR // P2口中断源
__interrupt
void Port_1 (void) // 声明一个中断服务程序名为Port_1()
{if(GPIO_getInterruptStatus(GPIO_PORT_P1, GPIO_PIN1)){delay_ms(20);if(!GPIO_getInputPinValue(GPIO_PORT_P1, GPIO_PIN1)){//P1.0 toggleTimer_A_setCompareValue(TIMER_A0_BASE,TIMER_A_CAPTURECOMPARE_REGISTER_1,Timer_A_getCaptureCompareCount(TIMER_A0_BASE, TIMER_A_CAPTURECOMPARE_REGISTER_1) TIMER_PERIOD / 10);while(!GPIO_getInputPinValue(GPIO_PORT_P1, GPIO_PIN1));}//P2.1 IFG clearedGPIO_clearInterrupt(GPIO_PORT_P1, GPIO_PIN1);}
}
效果 2.单定时器产生多路PWM信号 初始化函数
#define TIMER_PERIOD 12500
void Timer_A_PWM_Init(void)
{
//复用P1.2、P1.3、P1.4、P1.5输出GPIO_setAsPeripheralModuleFunctionOutputPin(GPIO_PORT_P1, GPIO_PIN2|GPIO_PIN3|GPIO_PIN4|GPIO_PIN5);Timer_A_initUpModeParam htim {0};htim.clockSource TIMER_A_CLOCKSOURCE_SMCLK;htim.clockSourceDivider TIMER_A_CLOCKSOURCE_DIVIDER_40;htim.timerPeriod TIMER_PERIOD - 1;htim.timerInterruptEnable_TAIE TIMER_A_TAIE_INTERRUPT_DISABLE;htim.captureCompareInterruptEnable_CCR0_CCIE TIMER_A_CCIE_CCR0_INTERRUPT_DISABLE;htim.timerClear TIMER_A_DO_CLEAR;htim.startTimer true;Timer_A_initUpMode(TIMER_A0_BASE, htim);Timer_A_initCompareModeParam htim_PWM {0};htim_PWM.compareInterruptEnable TIMER_A_CAPTURECOMPARE_INTERRUPT_DISABLE;htim_PWM.compareOutputMode TIMER_A_OUTPUTMODE_RESET_SET;htim_PWM.compareRegister TIMER_A_CAPTURECOMPARE_REGISTER_1;htim_PWM.compareValue (int)(TIMER_PERIOD * 0.2);//Initialize compare mode to generate PWM1Timer_A_initCompareMode(TIMER_A0_BASE, htim_PWM);htim_PWM.compareRegister TIMER_A_CAPTURECOMPARE_REGISTER_2;htim_PWM.compareValue (int)(TIMER_PERIOD * 0.4);//Initialize compare mode to generate PWM2Timer_A_initCompareMode(TIMER_A0_BASE, htim_PWM);htim_PWM.compareRegister TIMER_A_CAPTURECOMPARE_REGISTER_3;htim_PWM.compareValue (int)(TIMER_PERIOD * 0.6);//Initialize compare mode to generate PWM3Timer_A_initCompareMode(TIMER_A0_BASE, htim_PWM);htim_PWM.compareRegister TIMER_A_CAPTURECOMPARE_REGISTER_4;htim_PWM.compareValue (int)(TIMER_PERIOD * 0.8);//Initialize compare mode to generate PWM4Timer_A_initCompareMode(TIMER_A0_BASE, htim_PWM);}依次将TA0.1、TA0.2、TA0.3、TA0.4初始化为占空比20%、40%、60%、80% 时钟源为SMCLK 25MHz 分频系数为40 装载值为12500 - 1 故所得PWM频率为25MHz/40/1250050Hz
实验结果 3.对称PWM信号的产生
初始化程序
将上一个程稍作修改即可产生对称PWM信号 其中compareOutputMode值的效果参考下图 时钟源为SMCLK 25MHz 分频系数为40 装载值为12500 - 1 因采用增\减计数模式 故所得PWM频率为25MHz/40/12500/225Hz
#define TIMER_PERIOD 12500
void Timer_A_PWM_Init(void)
{GPIO_setAsPeripheralModuleFunctionOutputPin(GPIO_PORT_P1, GPIO_PIN2|GPIO_PIN3|GPIO_PIN4|GPIO_PIN5);Timer_A_initUpDownModeParam htim {0};htim.clockSource TIMER_A_CLOCKSOURCE_SMCLK;htim.clockSourceDivider TIMER_A_CLOCKSOURCE_DIVIDER_40;htim.timerPeriod TIMER_PERIOD - 1;htim.timerInterruptEnable_TAIE TIMER_A_TAIE_INTERRUPT_DISABLE;htim.captureCompareInterruptEnable_CCR0_CCIE TIMER_A_CCIE_CCR0_INTERRUPT_DISABLE;htim.timerClear TIMER_A_DO_CLEAR;htim.startTimer true;Timer_A_initUpDownMode(TIMER_A0_BASE, htim);Timer_A_initCompareModeParam htim_PWM {0};htim_PWM.compareInterruptEnable TIMER_A_CAPTURECOMPARE_INTERRUPT_DISABLE;htim_PWM.compareOutputMode TIMER_A_OUTPUTMODE_TOGGLE_RESET;htim_PWM.compareRegister TIMER_A_CAPTURECOMPARE_REGISTER_1;htim_PWM.compareValue (int)(TIMER_PERIOD * 0.2);//Initialize compare mode to generate PWM1Timer_A_initCompareMode(TIMER_A0_BASE, htim_PWM);htim_PWM.compareRegister TIMER_A_CAPTURECOMPARE_REGISTER_2;htim_PWM.compareValue (int)(TIMER_PERIOD * 0.4);//Initialize compare mode to generate PWM2Timer_A_initCompareMode(TIMER_A0_BASE, htim_PWM);htim_PWM.compareRegister TIMER_A_CAPTURECOMPARE_REGISTER_3;htim_PWM.compareValue (int)(TIMER_PERIOD * 0.6);//Initialize compare mode to generate PWM3Timer_A_initCompareMode(TIMER_A0_BASE, htim_PWM);htim_PWM.compareRegister TIMER_A_CAPTURECOMPARE_REGISTER_4;htim_PWM.compareValue (int)(TIMER_PERIOD * 0.8);//Initialize compare mode to generate PWM4Timer_A_initCompareMode(TIMER_A0_BASE, htim_PWM);
}实验结果
