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標題: STC8G1K08單片機的PWM為什么沒有輸出，在定時器0定義IO取反，但是占空比不管用 [打印本頁]

作者: 暖西夏 時間: 2021-5-24 13:26
標題: STC8G1K08單片機的PWM為什么沒有輸出，在定時器0定義IO取反，但是占空比不管用
/************************ 定時器配置 ****************************/
void       Timer_config(void)
{
      TIM_InitTypeDef             TIM_InitStructure;                                              //結構定義
      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;                      //指定中斷優先級(低到高) Polity_0,Polity_1,Polity_2,Polity_3
      TIM_InitStructure.TIM_Interrupt = ENABLE;                                     //中斷是否允許, ENABLE或DISABLE
      TIM_InitStructure.TIM_ClkSource = TIM_CLOCK_1T;             //指定時鐘源,    TIM_CLOCK_1T,TIM_CLOCK_12T,TIM_CLOCK_Ext
      TIM_InitStructure.TIM_ClkOut = ENABLE;                               //是否輸出高速脈沖, ENABLE或DISABLE
      TIM_InitStructure.TIM_Value    = 65536UL - (MAIN_Fosc / 1000);             //中斷頻率, 1000次/秒
      TIM_InitStructure.TIM_Run    = ENABLE;                                     //是否初始化后啟動定時器, ENABLE或DISABLE
      Timer_Inilize(Timer0,&TIM_InitStructure);                                     //初始化Timer0       Timer0,Timer1,Timer2,Timer3,Timer4
}

/***************  串口初始化函數 *****************/
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;                      //指定中斷優先級(低到高) Polity_0,Polity_1,Polity_2,Polity_3
      PWMx_InitStructure.PWM2_SetPolity  = Polity_0;                      //指定中斷優先級(低到高) Polity_0,Polity_1,Polity_2,Polity_3
      PWMx_InitStructure.PWM3_SetPolity  = Polity_0;                      //指定中斷優先級(低到高) Polity_0,Polity_1,Polity_2,Polity_3
      PWMx_InitStructure.PWM4_SetPolity  = Polity_0;                      //指定中斷優先級(低到高) Polity_0,Polity_1,Polity_2,Polity_3

      PWMx_InitStructure.PWM_Period = 1024;                                                       //周期時間, 0~65535
      PWMx_InitStructure.PWM1_Duty = PWMA_Duty.PWM1_Duty;       //PWM1占空比時間, 0~Period
      PWMx_InitStructure.PWM2_Duty = PWMA_Duty.PWM2_Duty;       //PWM2占空比時間, 0~Period
      PWMx_InitStructure.PWM3_Duty = PWMA_Duty.PWM3_Duty;       //PWM3占空比時間, 0~Period
      PWMx_InitStructure.PWM4_Duty = PWMA_Duty.PWM4_Duty;       //PWM4占空比時間, 0~Period
      PWMx_InitStructure.PWM_DeadTime = 0;                                                             //死區發生器設置, 0~255

      PWMx_InitStructure.PWM_EnoSelect = ENO1P | ENO1N  ;       //輸出通道選擇,       ENO1P,ENO1N,ENO2P,ENO2N,ENO3P,ENO3N,ENO4P,ENO4N / ENO5P,ENO6P,ENO7P,ENO8P
      PWMx_InitStructure.PWM_PS_SW    = PWM1_SW_P10_P11 ;       //切換端口,             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;                               //開啟PWM1P輸入捕獲/比較輸出,  ENABLE,DISABLE
      PWMx_InitStructure.PWM_CC1NEnable  = ENABLE;                               //開啟PWM1N輸入捕獲/比較輸出,  ENABLE,DISABLE
      PWMx_InitStructure.PWM_CC2Enable = ENABLE;                               //開啟PWM2P輸入捕獲/比較輸出,  ENABLE,DISABLE
      PWMx_InitStructure.PWM_CC2NEnable  = ENABLE;                               //開啟PWM2N輸入捕獲/比較輸出,  ENABLE,DISABLE
      PWMx_InitStructure.PWM_CC3Enable = ENABLE;                               //開啟PWM3P輸入捕獲/比較輸出,  ENABLE,DISABLE
      PWMx_InitStructure.PWM_CC3NEnable  = ENABLE;                               //開啟PWM3N輸入捕獲/比較輸出,  ENABLE,DISABLE
      PWMx_InitStructure.PWM_CC4Enable = ENABLE;                               //開啟PWM4P輸入捕獲/比較輸出,  ENABLE,DISABLE
      PWMx_InitStructure.PWM_CC4NEnable  = ENABLE;                               //開啟PWM4N輸入捕獲/比較輸出,  ENABLE,DISABLE

      PWMx_InitStructure.PWM_MainOutEnable= ENABLE;                               //主輸出使能, ENABLE,DISABLE
      PWMx_InitStructure.PWM_CEN_Enable = ENABLE;                               //使能計數器, ENABLE,DISABLE
      PWM_Configuration(PWMA, &PWMx_InitStructure);                               //初始化PWM,  PWMA,PWMB
}

定時器中斷里面是這樣寫的

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);

作者: man1234567 時間: 2021-5-26 09:28
STC網站或工具中找個程例就可以。

作者: 紅燒魚頭 時間: 2022-8-4 16:37
STC8G1K08一個PWM有兩個引腳可以輸出，但是怎么選擇哪一個引腳怎么設置呢？文檔里有嗎？

作者: coody_sz 時間: 2022-8-4 17:49

紅燒魚頭發表于 2022-8-4 16:37
STC8G1K08一個PWM有兩個引腳可以輸出，但是怎么選擇哪一個引腳怎么設置呢？文檔里有嗎？

手冊第3章“功能腳切換”

作者: coody_sz 時間: 2022-8-4 17:51
樓主，PWM輸出的IO有沒有設置為準雙向口或推挽輸出？

作者: wulin 時間: 2022-8-4 21:08
//適用于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時鐘為系統時鐘
CL = 0x00;
CH = 0x00;

CCAPM0 = 0x42;       //PCA模塊0為PWM工作模式
PCA_PWM0 = 0x00;    //PCA模塊0輸出8位PWM
CCAP0H=CCAP0L=0x80; //PWM占空比為50%
//默認P1.1輸出PWM，改變CCAP0H值即改變占空比(0xff~0x00=0%~100%)
while (1);
}

作者: 2314942018@qq.c 時間: 2022-9-8 10:07
最初接MOS管，發現沒有輸出，量了一下輸出電壓1.15v，換成三極管后正常輸出，就是頻率不能調低了嗎。

作者: coody_sz 時間: 2022-9-8 15:55
MOS管輸入電容較大，PWM頻率高時，由于IO有內阻，則等效RC濾波了。

作者: XCYYLX 時間: 2022-9-8 19:37
有沖突應該是，會有問題的

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