拷贝自STC官网下载的库函数例程中的“10-PCA-3路硬件PWM”中的main-pca-pwm.c文件里的初始化函数，你要哪组IO，随便切换。
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_P24_P25_P26_P27; //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 = PolityLow; //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_PWM; //PCA_Mode_PWM, PCA_Mode_Capture, PCA_Mode_SoftTimer, PCA_Mode_HighPulseOutput
PCA_InitStructure.PCA_PWM_Wide = PCA_PWM_8bit; //PCA_PWM_8bit, PCA_PWM_7bit, PCA_PWM_6bit
PCA_InitStructure.PCA_Interrupt_Mode = DISABLE; //PCA_Rise_Active, PCA_Fall_Active, ENABLE, DISABLE
PCA_InitStructure.PCA_Value = 128 << 8; //对于PWM,高8位为PWM占空比
PCA_Init(PCA0,&PCA_InitStructure);
PCA_InitStructure.PCA_Mode = PCA_Mode_PWM; //PCA_Mode_PWM, PCA_Mode_Capture, PCA_Mode_SoftTimer, PCA_Mode_HighPulseOutput
PCA_InitStructure.PCA_PWM_Wide = PCA_PWM_7bit; //PCA_PWM_8bit, PCA_PWM_7bit, PCA_PWM_6bit
PCA_InitStructure.PCA_Interrupt_Mode = DISABLE; //PCA_Rise_Active, PCA_Fall_Active, ENABLE, DISABLE
PCA_InitStructure.PCA_Value = 64 << 8; //对于PWM,高8位为PWM占空比
PCA_Init(PCA1,&PCA_InitStructure);
PCA_InitStructure.PCA_Mode = PCA_Mode_PWM; //PCA_Mode_PWM, PCA_Mode_Capture, PCA_Mode_SoftTimer, PCA_Mode_HighPulseOutput
PCA_InitStructure.PCA_PWM_Wide = PCA_PWM_6bit; //PCA_PWM_8bit, PCA_PWM_7bit, PCA_PWM_6bit
PCA_InitStructure.PCA_Interrupt_Mode = DISABLE; //PCA_Rise_Active, PCA_Fall_Active, ENABLE, DISABLE
PCA_InitStructure.PCA_Value = 32 << 8; //对于PWM,高8位为PWM占空比
PCA_Init(PCA2,&PCA_InitStructure);
CR = 1;
}
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