STC15W408AS单片机3路PWM输出波形实测

Posted 2022-01-08 perseverance52

STC15W408AS单片机3路PWM输出波形实测

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分析工具

某宝25就的工具，速度最高是24M的，完全够用了。

• Logic 2.3.41（软件官网即可下载到，不过只支持英文的）
  

• STC15W408AS在主频11.0592MHZ下逻辑分析仪实时采集的数据
  
• P35引脚采集的波形数据
  
• P36引脚采集的波形数据
  
• P37引脚采集的波形数据
  

细节放到

• STC15W408AS在主频24MHZ下逻辑分析仪实时采集的数据
  
• P37引脚采集的波形数据参数显示
  

• 细节放大
  
• 局部细节
  
• 局部细节下，具体数据参数
  

• P36引脚采集的波形数据参数显示
  
• P35引脚采集的波形数据参数显示
  

测试程序（库函数版本）

#include	"config.h"
#include	"PCA.h"
#include	"delay.h"

/*************	功能说明	**************

输出3路9~16位变化的PWM信号。类似"呼吸灯"的驱动.

PWM频率 = MAIN_Fosc / PWM_DUTY, 假设 MAIN_Fosc = 24MHZ, PWM_DUTY = 6000, 则输出PWM频率为4000HZ.

******************************************/

/*************	本地常量声明	**************/


/*************	本地变量声明	**************/

u16	pwm0,pwm1,pwm2;


/*************	本地函数声明	**************/



/*************  外部函数和变量声明 *****************/


void	PCA_config(void)

	PCA_InitTypeDef		PCA_InitStructure;

	PCA_InitStructure.PCA_Clock    = PCA_Clock_1T;		//PCA_Clock_1T, PCA_Clock_2T, PCA_Clock_4T, PCA_Clock_6T, PCA_Clock_8T, PCA_Clock_12T, PCA_Clock_Timer0_OF, PCA_Clock_ECI
	PCA_InitStructure.PCA_IoUse    = PCA_P34_P35_P36_P37;	//PCA_P12_P11_P10_P37, PCA_P34_P35_P36_P37, PCA_P24_P25_P26_P27
	PCA_InitStructure.PCA_Interrupt_Mode = DISABLE;		//ENABLE, DISABLE
	PCA_InitStructure.PCA_Polity   = PolityHigh;			//优先级设置	PolityHigh,PolityLow
	PCA_InitStructure.PCA_RUN      = DISABLE;			//ENABLE, DISABLE
	PCA_Init(PCA_Counter,&PCA_InitStructure);

	PCA_InitStructure.PCA_Mode     = PCA_Mode_HighPulseOutput;		//PCA_Mode_PWM, PCA_Mode_Capture, PCA_Mode_SoftTimer, PCA_Mode_HighPulseOutput
	PCA_InitStructure.PCA_PWM_Wide = 0;					//PCA_PWM_8bit, PCA_PWM_7bit, PCA_PWM_6bit
	PCA_InitStructure.PCA_Interrupt_Mode = ENABLE;		//PCA_Rise_Active, PCA_Fall_Active, ENABLE, DISABLE
	PCA_InitStructure.PCA_Value    = 65535;			//对于软件定时, 为匹配比较值
	PCA_Init(PCA0,&PCA_InitStructure);

	PCA_InitStructure.PCA_Mode     = PCA_Mode_HighPulseOutput;		//PCA_Mode_PWM, PCA_Mode_Capture, PCA_Mode_SoftTimer, PCA_Mode_HighPulseOutput
	PCA_InitStructure.PCA_PWM_Wide = 0;					//PCA_PWM_8bit, PCA_PWM_7bit, PCA_PWM_6bit
	PCA_InitStructure.PCA_Interrupt_Mode = ENABLE;		//PCA_Rise_Active, PCA_Fall_Active, ENABLE, DISABLE
	PCA_InitStructure.PCA_Value    = 65535;				//对于软件定时, 为匹配比较值
	PCA_Init(PCA1,&PCA_InitStructure);

	PCA_InitStructure.PCA_Mode     = PCA_Mode_HighPulseOutput;		//PCA_Mode_PWM, PCA_Mode_Capture, PCA_Mode_SoftTimer, PCA_Mode_HighPulseOutput
	PCA_InitStructure.PCA_PWM_Wide = 0;					//PCA_PWM_8bit, PCA_PWM_7bit, PCA_PWM_6bit
	PCA_InitStructure.PCA_Interrupt_Mode = ENABLE;		//PCA_Rise_Active, PCA_Fall_Active, ENABLE, DISABLE
	PCA_InitStructure.PCA_Value    = 65535;				//对于软件定时, 为匹配比较值
	PCA_Init(PCA2,&PCA_InitStructure);



/******************** task A **************************/
void main(void)

	P2M1 &= ~(0xe0);	//P2.7 P2.6 P2.5 设置为推挽输出
	P2M0 |=  (0xe0);
	
	PCA_config();
	pwm0 = (PWM_DUTY / 4 * 1);	//给PWM一个初值
	pwm1 = (PWM_DUTY / 4 * 2);
	pwm2 = (PWM_DUTY / 4 * 3);

	PWMn_Update(PCA0,pwm0);
	PWMn_Update(PCA1,pwm1);
	PWMn_Update(PCA2,pwm2);

	EA = 1;
	
	while (1)
	
		delay_ms(2);

		//if(++pwm0 >= PWM_HIGH_MAX)	
			pwm0 = PWM_HIGH_MAX;
		PWMn_Update(PCA0,pwm0);

		//if(++pwm1 >= PWM_HIGH_MAX)	
			pwm1 = PWM_HIGH_MIN;
		PWMn_Update(PCA1,pwm1);

		//if(++pwm2 >= PWM_HIGH_MAX)	
			pwm2 = PWM_HIGH_MIN;
		PWMn_Update(PCA2,pwm2);
	

测试程序资源

链接：https://pan.baidu.com/s/1VNtaWd59ja0mPIW-hEg4eg 
提取码：yqux