STC8G1K08单片机的PWM为什么没有输出，在定时器0定义IO取反，但是占空比不管用

ID:807182 · 发表于 2021-5-24 13:26

/************************ 定时器配置 ****************************/
void       Timer_config(void)
{
      TIM_InitTypeDef             TIM_InitStructure;                                              //结构定义
      TIM_InitStructure.TIM_Mode    = TIM_16BitAutoReload;       //指定工作模式, TIM_16BitAutoReload,TIM_16Bit,TIM_8BitAutoReload,TIM_16BitAutoReloadNoMask
      TIM_InitStructure.TIM_Polity = Polity_0;                      //指定中断优先级(低到高) Polity_0,Polity_1,Polity_2,Polity_3
      TIM_InitStructure.TIM_Interrupt = ENABLE;                                     //中断是否允许, ENABLE或DISABLE
      TIM_InitStructure.TIM_ClkSource = TIM_CLOCK_1T;             //指定时钟源,    TIM_CLOCK_1T,TIM_CLOCK_12T,TIM_CLOCK_Ext
      TIM_InitStructure.TIM_ClkOut = ENABLE;                               //是否输出高速脉冲, ENABLE或DISABLE
      TIM_InitStructure.TIM_Value    = 65536UL - (MAIN_Fosc / 1000);             //中断频率, 1000次/秒
      TIM_InitStructure.TIM_Run    = ENABLE;                                     //是否初始化后启动定时器, ENABLE或DISABLE
      Timer_Inilize(Timer0,&TIM_InitStructure);                                     //初始化Timer0       Timer0,Timer1,Timer2,Timer3,Timer4
}

/***************  串口初始化函数 *****************/
void       PWM_config(void)
{
      PWMx_InitDefine             PWMx_InitStructure;

      PWMx_InitStructure.PWM1_Mode =       CCMRn_PWM_MODE1;       //模式,             CCMRn_FREEZE,CCMRn_MATCH_VALID,CCMRn_MATCH_INVALID,CCMRn_ROLLOVER,CCMRn_FORCE_INVALID,CCMRn_FORCE_VALID,CCMRn_PWM_MODE1,CCMRn_PWM_MODE2
      PWMx_InitStructure.PWM2_Mode =       CCMRn_PWM_MODE1;       //模式,             CCMRn_FREEZE,CCMRn_MATCH_VALID,CCMRn_MATCH_INVALID,CCMRn_ROLLOVER,CCMRn_FORCE_INVALID,CCMRn_FORCE_VALID,CCMRn_PWM_MODE1,CCMRn_PWM_MODE2
      PWMx_InitStructure.PWM3_Mode =       CCMRn_PWM_MODE1;       //模式,             CCMRn_FREEZE,CCMRn_MATCH_VALID,CCMRn_MATCH_INVALID,CCMRn_ROLLOVER,CCMRn_FORCE_INVALID,CCMRn_FORCE_VALID,CCMRn_PWM_MODE1,CCMRn_PWM_MODE2
      PWMx_InitStructure.PWM4_Mode =       CCMRn_PWM_MODE1;       //模式,             CCMRn_FREEZE,CCMRn_MATCH_VALID,CCMRn_MATCH_INVALID,CCMRn_ROLLOVER,CCMRn_FORCE_INVALID,CCMRn_FORCE_VALID,CCMRn_PWM_MODE1,CCMRn_PWM_MODE2

      PWMx_InitStructure.PWM1_SetPolity  = Polity_0;                      //指定中断优先级(低到高) Polity_0,Polity_1,Polity_2,Polity_3
      PWMx_InitStructure.PWM2_SetPolity  = Polity_0;                      //指定中断优先级(低到高) Polity_0,Polity_1,Polity_2,Polity_3
      PWMx_InitStructure.PWM3_SetPolity  = Polity_0;                      //指定中断优先级(低到高) Polity_0,Polity_1,Polity_2,Polity_3
      PWMx_InitStructure.PWM4_SetPolity  = Polity_0;                      //指定中断优先级(低到高) Polity_0,Polity_1,Polity_2,Polity_3

      PWMx_InitStructure.PWM_Period = 1024;                                                       //周期时间, 0~65535
      PWMx_InitStructure.PWM1_Duty = PWMA_Duty.PWM1_Duty;       //PWM1占空比时间, 0~Period
      PWMx_InitStructure.PWM2_Duty = PWMA_Duty.PWM2_Duty;       //PWM2占空比时间, 0~Period
      PWMx_InitStructure.PWM3_Duty = PWMA_Duty.PWM3_Duty;       //PWM3占空比时间, 0~Period
      PWMx_InitStructure.PWM4_Duty = PWMA_Duty.PWM4_Duty;       //PWM4占空比时间, 0~Period
      PWMx_InitStructure.PWM_DeadTime = 0;                                                             //死区发生器设置, 0~255

      PWMx_InitStructure.PWM_EnoSelect = ENO1P | ENO1N  ;       //输出通道选择,       ENO1P,ENO1N,ENO2P,ENO2N,ENO3P,ENO3N,ENO4P,ENO4N / ENO5P,ENO6P,ENO7P,ENO8P
      PWMx_InitStructure.PWM_PS_SW    = PWM1_SW_P10_P11 ;       //切换端口,             PWM1_SW_P10_P11,PWM1_SW_P20_P21,PWM1_SW_P60_P61
                                                                                                                                                                                                                     //                                              PWM2_SW_P12_P13,PWM2_SW_P22_P23,PWM2_SW_P62_P63
                                                                                                                                                                                                                     //                                              PWM3_SW_P14_P15,PWM3_SW_P24_P25,PWM3_SW_P64_P65
                                                                                                                                                                                                                     //                                              PWM4_SW_P16_P17,PWM4_SW_P26_P27,PWM4_SW_P66_P67,PWM4_SW_P34_P33

      PWMx_InitStructure.PWM_CC1Enable = ENABLE;                               //开启PWM1P输入捕获/比较输出,  ENABLE,DISABLE
      PWMx_InitStructure.PWM_CC1NEnable  = ENABLE;                               //开启PWM1N输入捕获/比较输出,  ENABLE,DISABLE
      PWMx_InitStructure.PWM_CC2Enable = ENABLE;                               //开启PWM2P输入捕获/比较输出,  ENABLE,DISABLE
      PWMx_InitStructure.PWM_CC2NEnable  = ENABLE;                               //开启PWM2N输入捕获/比较输出,  ENABLE,DISABLE
      PWMx_InitStructure.PWM_CC3Enable = ENABLE;                               //开启PWM3P输入捕获/比较输出,  ENABLE,DISABLE
      PWMx_InitStructure.PWM_CC3NEnable  = ENABLE;                               //开启PWM3N输入捕获/比较输出,  ENABLE,DISABLE
      PWMx_InitStructure.PWM_CC4Enable = ENABLE;                               //开启PWM4P输入捕获/比较输出,  ENABLE,DISABLE
      PWMx_InitStructure.PWM_CC4NEnable  = ENABLE;                               //开启PWM4N输入捕获/比较输出,  ENABLE,DISABLE

      PWMx_InitStructure.PWM_MainOutEnable= ENABLE;                               //主输出使能, ENABLE,DISABLE
      PWMx_InitStructure.PWM_CEN_Enable = ENABLE;                               //使能计数器, ENABLE,DISABLE
      PWM_Configuration(PWMA, &PWMx_InitStructure);                               //初始化PWM,  PWMA,PWMB
}

定时器中断里面是这样写的

if(!PWM1_Flag)
      {
            PWMA_Duty.PWM1_Duty++;
            if(PWMA_Duty.PWM1_Duty >= 2047) PWM1_Flag = 1;
      }
      else
      {
            PWMA_Duty.PWM1_Duty--;
            if(PWMA_Duty.PWM1_Duty <= 0) PWM1_Flag = 0;
      }

      if(!PWM2_Flag)
      {
            PWMA_Duty.PWM2_Duty++;
            if(PWMA_Duty.PWM2_Duty >= 2047) PWM2_Flag = 1;
      }
      else
      {
            PWMA_Duty.PWM2_Duty--;
            if(PWMA_Duty.PWM2_Duty <= 0) PWM2_Flag = 0;
      }

      if(!PWM3_Flag)
      {
            PWMA_Duty.PWM3_Duty++;
            if(PWMA_Duty.PWM3_Duty >= 2047) PWM3_Flag = 1;
      }
      else
      {
            PWMA_Duty.PWM3_Duty--;
            if(PWMA_Duty.PWM3_Duty <= 0) PWM3_Flag = 0;
      }

      if(!PWM4_Flag)
      {
            PWMA_Duty.PWM4_Duty++;
            if(PWMA_Duty.PWM4_Duty >= 2047) PWM4_Flag = 1;
      }
      else
      {
            PWMA_Duty.PWM4_Duty--;
            if(PWMA_Duty.PWM4_Duty <= 0) PWM4_Flag = 0;
      }

      UpdatePwm(PWMA, &PWMA_Duty);

ID:584814 · 发表于 2021-5-26 09:28

STC网站或工具中找个程例就可以。

ID:188720 · 发表于 2022-8-4 16:37

STC8G1K08一个PWM有两个引脚可以输出，但是怎么选择哪一个引脚怎么设置呢？文档里有吗？

ID:1034262 · 发表于 2022-8-4 17:49

红烧鱼头发表于 2022-8-4 16:37
STC8G1K08一个PWM有两个引脚可以输出，但是怎么选择哪一个引脚怎么设置呢？文档里有吗？

手册第3章“功能脚切换”

ID:1034262 · 发表于 2022-8-4 17:51

楼主，PWM输出的IO有没有设置为准双向口或推挽输出？

ID:213173 · 发表于 2022-8-4 21:08

//适用于STC8G1K08-16/20PIN
#include <STC8.H>

void main()
{
P1M0 = 0x02;          //P1.1推挽模式
P1M1 = 0x00;          //P1.1推挽模式
P3M0 = 0x00;
P3M1 = 0x00;
P5M0 = 0x00;
P5M1 = 0x00;

CCON = 0x00;
CMOD = 0x08;          //PCA时钟为系统时钟
CL = 0x00;
CH = 0x00;

CCAPM0 = 0x42;       //PCA模块0为PWM工作模式
PCA_PWM0 = 0x00;    //PCA模块0输出8位PWM
CCAP0H=CCAP0L=0x80; //PWM占空比为50%
//默认P1.1输出PWM，改变CCAP0H值即改变占空比(0xff~0x00=0%~100%)
while (1);
}

ID:631012 · 发表于 2022-9-8 10:07

最初接MOS管，发现没有输出，量了一下输出电压1.15v，换成三极管后正常输出，就是频率不能调低了吗。

ID:1034262 · 发表于 2022-9-8 15:55

MOS管输入电容较大，PWM频率高时，由于IO有内阻，则等效RC滤波了。

ID:999824 · 发表于 2022-9-8 19:37

有冲突应该是，会有问题的

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