{"id":645,"date":"2024-07-21T17:06:12","date_gmt":"2024-07-21T09:06:12","guid":{"rendered":"https:\/\/aoofoo.com\/?p=645"},"modified":"2024-07-22T15:10:50","modified_gmt":"2024-07-22T07:10:50","slug":"2-17-tim%e8%be%93%e5%85%a5%e6%8d%95%e8%8e%b7%e4%bb%a3%e7%a0%81%e9%83%a8%e5%88%86","status":"publish","type":"post","link":"https:\/\/aoofoo.com\/index.php\/2024\/07\/21\/2-17-tim%e8%be%93%e5%85%a5%e6%8d%95%e8%8e%b7%e4%bb%a3%e7%a0%81%e9%83%a8%e5%88%86\/","title":{"rendered":"2.17 TIM\u8f93\u5165\u6355\u83b7\u4ee3\u7801\u90e8\u5206"},"content":{"rendered":"

\u8f93\u5165\u6355\u83b7\u6d4b\u9891\u7387<\/h2>\n

\u8f93\u5165\u6355\u83b7\u6d4b\u9891\u7387\u63a5\u7ebf\u56fe<\/h3>\n

\"\"<\/p>\n

\u6d4b\u91cf\u4fe1\u53f7\u7684\u8f93\u5165\u4fe1\u53f7\u662fPA6\uff0c\u4fe1\u53f7\u4ecePA6\u8fdb\u5165\u3002<\/p>\n

\u5f85\u6d4b\u7684PWM\u4fe1\u53f7\u4e5f\u662f\u7531STM32\u81ea\u5df1\u751f\u6210\u7684\uff0c\u8f93\u51fa\u5f15\u811a\u662fPA0\u3002<\/p>\n

\u6240\u4ee5\u63a5\u7ebf\u8fd9\u91cc\uff0c\u76f4\u63a5\u7528\u4e00\u6839\u7ebf\u628aPA0\u5f15\u5230PA6\u5c31\u884c\u4e86\u3002<\/p>\n

\u8f93\u5165\u6355\u83b7\u6d4b\u9891\u7387\u4ee3\u7801<\/h3>\n

\u8f93\u51faPWM\u4ee3\u7801<\/h4>\n

PWM\u7684\u9891\u7387\u548c\u5360\u7a7a\u6bd4\u90fd\u662f\u53ef\u8c03\u7684\uff0c\u6211\u4eec\u77e5\u9053\u5360\u7a7a\u6bd4 = CCR\/ARR\uff0c\u5982\u679c\u540e\u7eed\u60f3\u8981\u8c03\u8282\u5360\u7a7a\u6bd4\uff0c\u6539\u53d8CCR\u6216\u8005ARR\u7684\u503c\u90fd\u662f\u53ef\u4ee5\u7684\uff0c\u4f46\u662f\u6211\u4eec\u7684ARR\u7684\u503c\u4e00\u822c\u662f1000-1\u6216\u8005100-1\uff0c\u8fd9\u6837\u53ea\u9700\u8981\u6539\u53d8\u6355\u83b7\u6bd4\u8f83\u5bc4\u5b58\u5668CCR\u7684\u503c\uff0c\u5c31\u53ef\u4ee5\u89c4\u5f8b\u7684\u6539\u53d8\u5360\u7a7a\u6bd4\u3002<\/p>\n

\u53e6\u5916\uff0c\u6211\u4eec\u4e5f\u77e5\u9053 PWM\u9891\u7387 = \u65f6\u949f\u4fe1\u53f7 \/ (PSC+1) \/ (ARR+1) \uff0c\u65e2\u7136\u6211\u4eec\u9700\u8981\u89c4\u5f8b\u53ef\u8c03\u7684\u5360\u7a7a\u6bd4\uff0c\u90a3\u4e48ARR\u7684\u503c\u662f\u56fa\u5b9a\u7684\uff0c\u60f3\u8981\u4fee\u6539\u9891\u7387\uff0c\u5219\u9700\u8981\u6539\u53d8PSC\u7684\u503c\uff0c\u8fbe\u5230\u6211\u4eec\u60f3\u8981\u7684\u9891\u7387\u3002<\/p>\n

\u6240\u4ee5\u6211\u4eec\u56fa\u5b9aARR\u4e3a100-1\uff0c\u901a\u8fc7\u8c03\u8282PSC\u6765\u6539\u53d8PWM\u9891\u7387\u3002\u53e6\u5916ARR\u4e3a100-1\uff0cCCR\u7684\u6570\u503c\u76f4\u63a5\u5c31\u662f\u5360\u7a7a\u6bd4\uff0c\u7528\u8d77\u6765\u4e5f\u6bd4\u8f83\u76f4\u89c2\u3002<\/p>\n

\u901a\u8fc7\u4e4b\u524d\u7684\u5b66\u4e60\uff0c\u6211\u4eec\u4e5f\u77e5\u9053\u5355\u72ec\u5199\u5165PSC\u7684\u5e93\u51fd\u6570\u662fTIM_PrescalerConfig()\uff0c\u5199\u5165PSC\u3002<\/p>\n

\u6240\u4ee5\u8f93\u51faPWM\u6ce2\u7684\u4ee3\u7801\u662f\u8fd9\u6837\u7684\uff1a<\/p>\n

void PWM_Init()\r\n{\r\n\t\/\/\u5f00\u542f\u65f6\u949f\r\n\tRCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE);\r\n\t\/\/\u9009\u62e9\u65f6\u57fa\u5355\u5143\u65f6\u949f\r\n\tTIM_InternalClockConfig(TIM2);\r\n\t\/\/\u914d\u7f6e\u65f6\u57fa\u5355\u5143,\u4f7f\u5f97\u8ba1\u6570\u5668\u6ea2\u51fa\u9891\u7387\u4e3a1KHz\uff0c\u8ba1\u6570\u5668\u7684\u6ea2\u51fa\u9891\u7387 = PWM\u7684\u9891\u7387 =1KHz\r\n\tTIM_TimeBaseInitTypeDef TIM_TimeBaseStruture;\r\n\tTIM_TimeBaseStruture.TIM_ClockDivision=TIM_CKD_DIV1;\r\n\tTIM_TimeBaseStruture.TIM_CounterMode=TIM_CounterMode_Up;\r\n\tTIM_TimeBaseStruture.TIM_Period=100-1;\r\n\tTIM_TimeBaseStruture.TIM_Prescaler=720-1;\/\/720-1\r\n\tTIM_TimeBaseStruture.TIM_RepetitionCounter=0;\r\n\tTIM_TimeBaseInit(TIM2,&TIM_TimeBaseStruture);\r\n\t\/\/\u521d\u59cb\u5316\u8f93\u51fa\u6bd4\u8f83\u5355\u5143\r\n\tTIM_OCInitTypeDef TIM_OCInitStruture;\r\n\tTIM_OCInitStruture.TIM_OCMode=TIM_OCMode_PWM1;\r\n\tTIM_OCInitStruture.TIM_OCPolarity=TIM_OCPolarity_High;\r\n\tTIM_OCInitStruture.TIM_OutputState=TIM_OutputState_Enable;\r\n\tTIM_OCInitStruture.TIM_Pulse=0;\r\n\tTIM_OC1Init(TIM2,&TIM_OCInitStruture); \r\n\t\/*\u73b0\u5728\u6211\u4eec\u5df2\u7ecf\u628a\u901a\u9053\u521d\u59cb\u5316\u597d\u4e86\uff0c\u5728TIM2\u7684OC1\u901a\u9053\u4e0a\u5c31\u53ef\u4ee5\u8f93\u51faPWM\u6ce2\u5f62\u4e86\u3002*\/\r\n\t\/*\u4f46\u6700\u7ec8\uff0c\u8fd9\u4e2a\u6ce2\u5f62\u80af\u5b9a\u8981\u501f\u7528\u4e00\u4e0bGPIO\u53e3\u624d\u80fd\u8f93\u51fa\uff0c\u6240\u4ee5\u8fd8\u9700\u8981\u914d\u7f6e\u4e00\u4e0bGPIO*\/\r\n\t\/\/\u5f00\u542f\u65f6\u949f\uff0c\u914d\u7f6eGPIO\r\n\tRCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);\r\n\tGPIO_InitTypeDef GPIO_InitStruture;\r\n\tGPIO_InitStruture.GPIO_Mode=GPIO_Mode_AF_PP;\/\/\u590d\u7528\u63a8\u633d\u8f93\u51fa\r\n\tGPIO_InitStruture.GPIO_Pin=GPIO_Pin_0;\r\n\tGPIO_InitStruture.GPIO_Speed=GPIO_Speed_50MHz;\r\n\tGPIO_Init(GPIOA,&GPIO_InitStruture);\r\n\t\/\/\u542f\u52a8\u5b9a\u65f6\u5668\r\n\tTIM_Cmd(TIM2,ENABLE);\r\n\t\r\n}\r\n\/\/\u6539\u53d8\u901a\u90531\u7684\u5360\u7a7a\u6bd4\r\nvoid PWM_SetCompare1(uint16_t Compare)\r\n{\r\n\tTIM_SetCompare1(TIM2,Compare);\r\n}\r\n\/\/\u6539\u53d8\u901a\u90531\u7684\u9891\u7387\r\nvoid PWM_SetPrescaler(uint16_t Prescaler)\r\n{\r\n\tTIM_PrescalerConfig(TIM2,Prescaler,TIM_PSCReloadMode_Immediate);\r\n}<\/code><\/pre>\n
 <\/p>\n
\u901a\u8fc7\u8fd9\u4e09\u4e2a\u51fd\u6570\uff0c\u53ef\u4ee5\u4f7f\u5f97PA0\u5f15\u811a\u8f93\u51faPWM\uff0c\u5e76\u4e14\u53ef\u4ee5\u6539\u53d8\u8f93\u51faPWM\u7684\u9891\u7387\u4e0e\u5360\u7a7a\u6bd4\u3002<\/p>\n
\u6d4b\u91cfPWM\u4ee3\u7801<\/h4>\n
\"\"<\/p>\n
\u7b2c\u4e00\u6b65\uff0cRCC\u5f00\u542f\u65f6\u949f\uff0c\u628aGPIO\u548cTIM\u7684\u65f6\u949f\u6253\u5f00\u3002<\/p>\n
\u7b2c\u4e8c\u6b65\uff0cGPIO\u521d\u59cb\u5316\uff0c\u628aGPIO\u914d\u7f6e\u6210\u8f93\u5165\u6a21\u5f0f\uff08\u4e00\u822c\u9009\u62e9\u4e0a\u62c9\u8f93\u5165\u6216\u8005\u6d6e\u7a7a\u8f93\u5165\u6a21\u5f0f\uff09\u3002<\/p>\n
\u7b2c\u4e09\u6b65\uff0c\u914d\u7f6e\u65f6\u57fa\u5355\u5143\uff0c\u8ba9CNT\u8ba1\u6570\u5668\u5728\u5185\u90e8\u65f6\u949f\u7684\u9a71\u52a8\u4e0b\u81ea\u589e\u8fd0\u884c\u3002<\/p>\n
\u7b2c\u56db\u6b65\uff0c\u914d\u7f6e\u8f93\u5165\u6355\u83b7\u5355\u5143\uff08\u5305\u62ec\u6ee4\u6ce2\u5668\u3001\u6781\u6027\u3001\u76f4\u8fde\u901a\u9053\u8fd8\u662f\u4ea4\u53c9\u901a\u9053\u3001\u5206\u9891\u5668\uff0c\u7ed3\u6784\u4f53\u53ef\u4ee5\u7edf\u4e00\u914d\u7f6e\uff09\u3002<\/p>\n
\u7b2c\u4e94\u6b65\uff0c\u9009\u62e9\u4ece\u6a21\u5f0f\u7684\u89e6\u53d1\u6e90\uff0c\u89e6\u53d1\u6e90\u9009\u62e9\u4e3aTI1FP1\u3002\uff08\u8c03\u7528\u4e00\u4e2a\u5e93\u51fd\u6570\u5373\u53ef\uff09<\/p>\n
\u7b2c\u516d\u6b65\uff0c\u9009\u62e9\u89e6\u53d1\u4e4b\u540e\u6267\u884c\u7684\u64cd\u4f5c\u3002\uff08\u6267\u884cReset\u64cd\u4f5c\uff0c\u8c03\u7528\u4e00\u4e2a\u5e93\u51fd\u6570\u5373\u53ef\uff09<\/p>\n
\u7b2c\u4e03\u6b65\uff0c\u8c03\u7528TIM_Cmd()\u51fd\u6570\uff0c\u5f00\u542f\u5b9a\u65f6\u5668\u3002<\/p>\n
\u8fd9\u6837\u5c31\u5b8c\u6210\u4e86\uff0c\u5f53\u6211\u4eec\u9700\u8981\u8bfb\u53d6\u6700\u65b0\u4e00\u4e2a\u5468\u671f\u7684\u9891\u7387\u65f6\uff0c\u76f4\u63a5\u8bfb\u53d6CCR\u5bc4\u5b58\u5668\uff0c\u7136\u540e\u6309\u7167fc\/N\u8ba1\u7b97\u4e00\u4e0b\u5c31\u884c\u4e86\u3002<\/p>\n
\u63a5\u4e0b\u6765\u6211\u4eec\u6765\u5b66\u4e60\u4e00\u4e0b\u8fd9\u91cc\u9700\u8981\u7528\u5230\u7684\u5e93\u51fd\u6570\u3002<\/p>\n
<\/svg>\u521d\u59cb\u5316\u8f93\u5165\u6355\u83b7\u5355\u5143<\/div>
<\/p>\n
TIM_ICinit()\u51fd\u6570\u3002<\/p>\n
\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u9009\u62e9\u5b9a\u65f6\u5668\uff0c\u7b2c\u4e8c\u4e2a\u53c2\u6570\u5c31\u662f\u5305\u542b\u5404\u4e2a\u914d\u7f6e\u7684\u7ed3\u6784\u4f53\u3002<\/p>\n
\u53e6\u5916\u6ce8\u610f\uff0c\u8f93\u5165\u6355\u83b7\u548c\u8f93\u51fa\u6bd4\u8f83\u90fd\u67094\u4e2a\u901a\u9053\uff0cOCinit\u662f\u56db\u4e2a\u51fd\u6570\u914d\u7f6e\uff08\u914d\u7f6e\u8f93\u51fa\u6bd4\u8f83\u6a21\u5757\uff09\uff0c\u4e00\u4e2a\u901a\u9053\u6709\u4e00\u4e2a\u51fd\u6570\uff0c\u800cICInit\u662f4\u4e2a\u901a\u9053\u5171\u7528\u4e00\u4e2a\u51fd\u6570\u7684\uff0c\u5728\u7ed3\u6784\u4f53\u91cc\u4f1a\u989d\u5916\u6709\u4e2a\u53c2\u6570\uff0c\u53ef\u4ee5\u7528\u6765\u9009\u62e9\u5177\u4f53\u662f\u914d\u7f6e\u54ea\u4e2a\u901a\u9053\u3002\u56e0\u4e3a\u53ef\u80fd\u6709\u4ea4\u53c9\u901a\u9053\u7684\u914d\u7f6e\uff0c\u6240\u4ee5\u51fd\u6570\u5408\u5728\u4e00\u8d77\u6bd4\u8f83\u65b9\u4fbf\u3002<\/p>\n
TIM_PWMIConfig()\u51fd\u6570\u3002<\/p>\n
\u8fd9\u4e2a\u548cTIM_ICinit()\u51fd\u6570\u7c7b\u4f3c\uff0c\u90fd\u662f\u7528\u4e8e\u521d\u59cb\u5316\u8f93\u5165\u6355\u83b7\u5355\u5143\u7684\uff0c\u4f46\u662f\u4e0a\u4e00\u4e2a\u51fd\u6570\u53ea\u662f\u5355\u4e00\u5730\u914d\u7f6e\u4e00\u4e2a\u901a\u9053\uff0c\u800c\u8fd9\u4e2a\u51fd\u6570\u53ef\u4ee5\u5feb\u901f\u914d\u7f6e\u4e24\u4e2a\u901a\u9053\uff0c\u628a\u5916\u8bbe\u7535\u8def\u7ed3\u6784\u914d\u7f6e\u6210PWMI\u6a21\u5f0f\u3002<\/p>\n
<\/div><\/div><\/div>\n
<\/svg>\u7ed9\u8f93\u5165\u6355\u83b7\u7ed3\u6784\u4f53\u8d4b\u521d\u59cb\u503c<\/div>
<\/p>\n
TIM_ICStructInit(TIM_ICInitTypeDef* TIM_ICInitStruct);<\/p>\n
<\/div><\/div><\/div>\n
<\/svg>\u9009\u62e9\u4ece\u6a21\u5f0f\u89e6\u53d1\u6e90<\/div>
<\/p>\n
TIM_SelectInputTrigger(TIM_TypeDef* TIMx, uint16_t TIM_InputTriggerSource);\u9009\u62e9\u8f93\u5165\u89e6\u53d1\u6e90TRGI<\/p>\n
\"\"<\/p>\n
\u4ece\u6a21\u5f0f\u7684\u89e6\u53d1\u6e90\u9009\u62e9\uff0c\u8c03\u7528\u8fd9\u4e2a\u51fd\u6570\u5c31\u80fd\u9009\u62e9\u4ece\u6a21\u5f0f\u89e6\u53d1\u6e90\uff0c\u6bd4\u5982\u6211\u4eec\u672c\u8282\u8981\u7528\u7684TI1FP1\u3002<\/p>\n
<\/div><\/div><\/div>\n
<\/svg>\u9009\u62e9\u4e3b\u6a21\u5f0f\u8f93\u51fa\u7684\u89e6\u53d1\u6e90<\/div>
<\/p>\n
\"\"<\/p>\n
TIM_SelectOnePulseMode(TIM_TypeDef* TIMx, uint16_t TIM_OPMode);\u9009\u62e9\u8f93\u51fa\u89e6\u53d1\u6e90TRGO\u3002<\/p>\n
<\/div><\/div><\/div>\n
<\/svg>\u9009\u62e9\u4ece\u6a21\u5f0f<\/div>
<\/p>\n
\"\"<\/p>\n
TIM_SelectSlaveMode(TIM_TypeDef* TIMx, uint16_t TIM_SlaveMode);<\/p>\n
<\/div><\/div><\/div>\n
<\/svg>\u5355\u72ec\u914d\u7f6e\u5404\u4e2a\u901a\u9053\u7684\u5206\u9891\u5668<\/div>
<\/p>\n
void TIM_SetIC1Prescaler(TIM_TypeDef* TIMx, uint16_t TIM_ICPSC);
\nvoid TIM_SetIC2Prescaler(TIM_TypeDef* TIMx, uint16_t TIM_ICPSC);
\nvoid TIM_SetIC3Prescaler(TIM_TypeDef* TIMx, uint16_t TIM_ICPSC);
\nvoid TIM_SetIC4Prescaler(TIM_TypeDef* TIMx, uint16_t TIM_ICPSC);<\/p>\n
\u8fd9\u4e2a\u53c2\u6570\u7ed3\u6784\u4f53\u4e5f\u53ef\u4ee5\u914d\u7f6e\uff0c\u662f\u4e00\u6837\u7684\u6548\u679c\u3002<\/p>\n
<\/div><\/div><\/div>\n
<\/svg>\u5206\u522b\u8bfb\u53d64\u4e2a\u901a\u9053\u7684CCR<\/div>
<\/p>\n
uint16_t TIM_GetCapture1(TIM_TypeDef* TIMx);
\nuint16_t TIM_GetCapture2(TIM_TypeDef* TIMx);
\nuint16_t TIM_GetCapture3(TIM_TypeDef* TIMx);
\nuint16_t TIM_GetCapture4(TIM_TypeDef* TIMx);<\/p>\n
\u8fd94\u4e2a\u51fd\u6570\u548cSetCompare1\u30012\u30013\u30014\u662f\u5bf9\u5e94\u7684\uff0c\u8bfb\u5199\u7684\u90fd\u662fCCR\u5bc4\u5b58\u5668\u3002<\/p>\n
\u8f93\u51fa\u6bd4\u8f83\u6a21\u5f0f\u4e0b\uff0cCCR\u662f\u53ea\u5199\u7684\uff0c\u8981\u7528SetCompare\u5199\u5165\u3002<\/p>\n
\u8f93\u5165\u6355\u83b7\u6a21\u5f0f\u4e0b\uff0cCCR\u662f\u53ea\u8bfb\u7684\uff0c\u8981\u7528GetCapture\u8bfb\u53d6\u3002<\/p>\n
<\/div><\/div><\/div>\n
<\/svg><\/span>
\u6ce8\u610f\u6ee4\u6ce2\u5668\u548c\u5206\u9891\u5668\u7684\u533a\u522b\uff0c\u867d\u7136\u4ed6\u4eec\u4fe9\u90fd\u662f\u8ba1\u6b21\u7684\u4e1c\u897f\uff0c\u4f46\u662f\u6ee4\u6ce2\u5668\u8ba1\u6b21\u4e0d\u4f1a\u6539\u53d8\u4fe1\u53f7\u7684\u539f\u6709\u9891\u7387\uff0c\u4e00\u822c\u6ee4\u6ce2\u5668\u7684\u91c7\u6837\u9891\u7387\u8fdc\u9ad8\u4e8e\u4fe1\u53f7\u9891\u7387\uff0c\u6240\u4ee5\u4ed6\u53ea\u4f1a\u6ee4\u9664\u9ad8\u9891\u566a\u58f0\uff0c\u4f7f\u4fe1\u53f7\u66f4\u5e73\u6ed1\u3002\u800c\u5206\u9891\u5668\u5c31\u662f\u5bf9\u4fe1\u53f7\u672c\u8eab\u8fdb\u884c\u8ba1\u6b21\u4e86\uff0c\u4f1a\u6539\u53d8\u9891\u7387\u3002<\/div><\/div>\n
\u73b0\u5728\u601d\u8def\u6709\u4e86\uff0c\u5e93\u51fd\u6570\u4e5f\u6709\u4e86\uff0c\u53ef\u4ee5\u5f00\u59cb\u5199\u7a0b\u5e8f\u4e86\u3002<\/p>\n
void IC_Init()\r\n{\r\n\t\/\/\u5f00\u542f\u65f6\u949f\uff0c\u6211\u4eec\u4f7f\u7528TIM3\u6765\u6355\u83b7PWM\u6ce2\u3002\r\n\tRCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);\r\n\tRCC_APB1PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);\r\n\t\/\/\u914d\u7f6eGPIO\uff0cPA6\u6539\u6210\u4e0a\u62c9\u8f93\u5165\u3002\r\n\tGPIO_InitTypeDef GPIO_InitStruture;\r\n\tGPIO_InitStruture.GPIO_Mode=GPIO_Mode_IPU;\r\n\tGPIO_InitStruture.GPIO_Pin=GPIO_Pin_6;\r\n\tGPIO_Init(GPIOA,&GPIO_InitStruture);\r\n\t\/\/\u9009\u62e9\u65f6\u57fa\u5355\u5143\u65f6\u949f\r\n\tTIM_InternalClockConfig(TIM3);\r\n\t\/\/\u914d\u7f6e\u65f6\u57fa\u5355\u5143,\u4f7f\u5f97\u8ba1\u6570\u5668\u6ea2\u51fa\u9891\u7387\u4e3a1KHz\uff0c\u8ba1\u6570\u5668\u7684\u6ea2\u51fa\u9891\u7387 = PWM\u7684\u9891\u7387 =1KHz\r\n\tTIM_TimeBaseInitTypeDef TIM_TimeBaseStruture;\r\n\tTIM_TimeBaseStruture.TIM_ClockDivision=TIM_CKD_DIV1;\r\n\tTIM_TimeBaseStruture.TIM_CounterMode=TIM_CounterMode_Up;\r\n\t\/\/ARR\u7684\u503c\u6700\u597d\u8bbe\u7f6e\u7684\u5927\u4e00\u4e9b\uff0c\u9632\u6b62\u8ba1\u6570\u6ea2\u51fa\uff0c\u8fd9\u91cc\u7ed9\u6700\u5927\u503c65536-1\uff0c\u6ee1\u91cf\u7a0b\u8ba1\u6570\u3002\r\n\tTIM_TimeBaseStruture.TIM_Period=65536 -1; \r\n\t\/\/\u8fd9\u91cc\u7684PSC\u51b3\u5b9a\u4e86\u6d4b\u5468\u6cd5\u7684\u6807\u51c6\u9891\u7387fc\u3002\u6211\u4eec\u7ed9\u7684\u6807\u51c6\u9891\u7387\u662f1MHz\u3002\r\n\tTIM_TimeBaseStruture.TIM_Prescaler=72-1;\r\n\tTIM_TimeBaseStruture.TIM_RepetitionCounter=0;\r\n\tTIM_TimeBaseInit(TIM3,&TIM_TimeBaseStruture);\r\n\t\r\n\t\/\/\u521d\u59cb\u5316\u8f93\u5165\u6355\u83b7\u5355\u5143\u3002\r\n\tTIM_ICInitTypeDef TIM_ICInitStruture;\r\n\t\/\/\u9009\u62e9\u901a\u9053\uff0c\u9009\u62e9TIM3\u7684\u901a\u90531.\r\n\tTIM_ICInitStruture.TIM_Channel=TIM_Channel_1;\r\n\t\/\/\u914d\u7f6e\u8f93\u5165\u6355\u83b7\u7684\u6ee4\u6ce2\u5668\uff0c\u8303\u56f4\u662f0X0~0XF\u3002\u8d8a\u5927\u6ee4\u6ce2\u6548\u679c\u8d8a\u597d\u3002\r\n\tTIM_ICInitStruture.TIM_ICFilter=0XF;\r\n\t\/\/\u8fb9\u6cbf\u68c0\u6d4b\u3001\u6781\u6027\u9009\u62e9\u3002\u6211\u4eec\u9009\u62e9\u4e0a\u5347\u6cbf\u89e6\u53d1\u3002\r\n\tTIM_ICInitStruture.TIM_ICPolarity=TIM_ICPolarity_Rising;\r\n\t\/\/\u6211\u4eec\u9700\u8981\u6bcf\u6b21\u89e6\u53d1\u90fd\u6709\u6548\uff0c\u6240\u4ee5\u5206\u9891\u5668\u9009\u62e9\u4e0d\u5206\u9891\u3002\r\n\tTIM_ICInitStruture.TIM_ICPrescaler=TIM_ICPSC_DIV1;\r\n\t\/\/\u9009\u62e9\u89e6\u53d1\u4fe1\u53f7\u4ece\u54ea\u4e2a\u5f15\u811a\u8f93\u5165\uff0c\u53ef\u4ee5\u9009\u62e9\u76f4\u8fde\u901a\u9053\u6216\u8005\u662f\u4ea4\u53c9\u901a\u9053\u3002\r\n\t\/\/\u6211\u4eec\u8fd9\u91cc\u9009\u62e9\u76f4\u8fde\u901a\u9053\u3002\r\n\tTIM_ICInitStruture.TIM_ICSelection=TIM_ICSelection_DirectTI;\r\n\tTIM_ICInit(TIM3,&TIM_ICInitStruture);\r\n\t\r\n\t\/\/\u914d\u7f6eTRGI\u7684\u89e6\u53d1\u6e90\u4e3aTI1FP1\u3002\r\n\tTIM_SelectInputTrigger(TIM3,TIM_TS_TI1FP1);\r\n\t\r\n\t\/\/\u914d\u7f6e\u4ece\u6a21\u5f0f\u4e3aReset\u3002\r\n\tTIM_SelectSlaveMode(TIM3,TIM_SlaveMode_Reset);\r\n\t\r\n\t\/\/\u4f7f\u80fd\u5b9a\u65f6\u5668\r\n\tTIM_Cmd(TIM3,ENABLE);\r\n\t\/\/\u5f53\u6211\u4eec\u542f\u52a8\u5b9a\u65f6\u5668\u540e\uff0cCNT\u5c31\u4f1a\u5728\u5185\u90e8\u4e0d\u65ad\u81ea\u589e\uff0c\u5373\u4f7f\u4fe1\u53f7\u6ca1\u6709\u8fc7\u6765\uff0c\u4ed6\u4e5f\u4f1a\u4e0d\u65ad\u81ea\u589e\u3002\r\n\t\/\/CNT\u6709\u4fe1\u53f7\u6765\u7684\u65f6\u5019\uff0c\u4ed6\u5c31\u4f1a\u5728\u4ece\u6a21\u5f0f\u7684\u4f5c\u7528\u4e0b\u81ea\u52a8\u6e05\u96f6\u3002\r\n}\r\n\r\n\/\/\u5f53\u6211\u4eec\u60f3\u8981\u67e5\u770b\u9891\u7387\uff0c\u9700\u8981\u8bfb\u53d6CCR\u8fdb\u884c\u8ba1\u7b97\u3002\r\nuint32_t IC_GetFreq()\r\n{\r\n\treturn 1000000 \/ TIM_GetCapture1(TIM3);\r\n}<\/code><\/pre>\n
\u5f53\u6211\u4eec\u5b9e\u9645\u6d4b\u91cf\u7684\u65f6\u5019\uff0c\u6d4b\u91cf1000Hz\u9891\u7387\u7684PWM\u65f6\uff0c\u663e\u793a\u7684\u662f1001Hz\uff0c\u53ef\u80fd\u662f\u8ba1\u6570\u5668\u521a\u52301000Hz\u7684\u90a3\u4e2a\u6570\u65f6\uff0c\u4fe1\u53f7\u4e5f\u53d1\u521a\u597d\u8df3\u53d8\uff0c\u56e0\u4e3a\u7535\u8def\u7ed3\u6784\u6216\u8005\u5176\u4ed6\u4ec0\u4e48\u539f\u56e0\uff0c\u5bfc\u81f4\u8fd9\u4e00\u4e2a\u6570\u521a\u597d\u6ca1\u6709\u8ba1\u5230\u3002\u4e0d\u8fc7\u8fd9\u4e2a\u4e5f\u5c5e\u4e8e\u6b63\u8d1f1\u8bef\u5dee\u7684\u8303\u7574\uff0c\u76ee\u524d\u8fd9\u4e2a\u8bef\u5dee\u4e5f\u662f\u7b26\u5408\u8981\u6c42\u7684\u3002\u5982\u679c\u89c9\u5f97\u522b\u626d\uff0c\u53ef\u4ee5\u5728TIM_GetCapture1(TIM3)\u7684\u57fa\u7840\u4e0a\u52a01\uff0c\u8fd9\u6837\u9891\u7387\u5c31\u6b63\u597d\u662f1000Hz\u4e86\u3002<\/p>\n
PWMI\u6d4b\u9891\u7387\u5360\u7a7a\u6bd4\u4ee3\u7801<\/h3>\n
\"\"<\/p>\n
\u5c31\u662f\u901a\u90531\u30012\u90fd\u8fdb\u884c\u4e00\u4e0b\u914d\u7f6e\uff0c\u901a\u90531\u4e0a\u5347\u6cbf\u89e6\u53d1\uff0c\u628a\u6574\u4e2a\u5468\u671f\u7684\u8ba1\u6570CNT\u8fd4\u56de\u7ed9CCR1\uff0c\u901a\u90532\u4e0b\u964d\u6cbf\u89e6\u53d1\uff0c\u628a\u9ad8\u7535\u5e73\u7684CNT\u8ba1\u6570\u8fd4\u56de\u7ed9CCR2\uff0c\u8fd9\u6837CCR2\/CCR2\u5c31\u662f\u5360\u7a7a\u6bd4\u4e86\u3002<\/p>\n
<\/svg>\u53ef\u4f18\u5316\u4ee3\u7801\uff0c\u53ef\u4ee5\u770b\u4e00\u4e0b\u8fd9\u90e8\u5206\u4ee3\u7801\u5982\u4f55\u4f18\u5316<\/div>
<\/p>\n
void IC_Init()\r\n{\r\n\t\/\/\u5f00\u542f\u65f6\u949f\uff0c\u6211\u4eec\u4f7f\u7528TIM3\u6765\u6355\u83b7PWM\u6ce2\u3002\r\n\tRCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);\r\n\tRCC_APB1PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);\r\n\t\/\/\u914d\u7f6eGPIO\uff0cPA6\u6539\u6210\u4e0a\u62c9\u8f93\u5165\u3002\r\n\tGPIO_InitTypeDef GPIO_InitStruture;\r\n\tGPIO_InitStruture.GPIO_Mode=GPIO_Mode_IPU;\r\n\tGPIO_InitStruture.GPIO_Pin=GPIO_Pin_6;\r\n\tGPIO_Init(GPIOA,&GPIO_InitStruture);\r\n\t\/\/\u9009\u62e9\u65f6\u57fa\u5355\u5143\u65f6\u949f\r\n\tTIM_InternalClockConfig(TIM3);\r\n\t\/\/\u914d\u7f6e\u65f6\u57fa\u5355\u5143,\u4f7f\u5f97\u8ba1\u6570\u5668\u6ea2\u51fa\u9891\u7387\u4e3a1KHz\uff0c\u8ba1\u6570\u5668\u7684\u6ea2\u51fa\u9891\u7387 = PWM\u7684\u9891\u7387 =1KHz\r\n\tTIM_TimeBaseInitTypeDef TIM_TimeBaseStruture;\r\n\tTIM_TimeBaseStruture.TIM_ClockDivision=TIM_CKD_DIV1;\r\n\tTIM_TimeBaseStruture.TIM_CounterMode=TIM_CounterMode_Up;\r\n\t\/\/ARR\u7684\u503c\u6700\u597d\u8bbe\u7f6e\u7684\u5927\u4e00\u4e9b\uff0c\u9632\u6b62\u8ba1\u6570\u6ea2\u51fa\uff0c\u8fd9\u91cc\u7ed9\u6700\u5927\u503c65536-1\uff0c\u6ee1\u91cf\u7a0b\u8ba1\u6570\u3002\r\n\tTIM_TimeBaseStruture.TIM_Period=65536 -1; \r\n\t\/\/\u8fd9\u91cc\u7684PSC\u51b3\u5b9a\u4e86\u6d4b\u5468\u6cd5\u7684\u6807\u51c6\u9891\u7387fc\u3002\u6211\u4eec\u7ed9\u7684\u6807\u51c6\u9891\u7387\u662f1MHz\u3002\r\n\tTIM_TimeBaseStruture.TIM_Prescaler=72-1;\r\n\tTIM_TimeBaseStruture.TIM_RepetitionCounter=0;\r\n\tTIM_TimeBaseInit(TIM3,&TIM_TimeBaseStruture);\r\n\t\r\n\t\/\/\u521d\u59cb\u5316\u8f93\u5165\u6355\u83b7\u5355\u5143\u3002\r\n\tTIM_ICInitTypeDef TIM_ICInitStruture;\r\n\t\/\/\u9009\u62e9\u901a\u9053\uff0c\u9009\u62e9TIM3\u7684\u901a\u90531.\r\n\tTIM_ICInitStruture.TIM_Channel=TIM_Channel_1;\r\n\t\/\/\u914d\u7f6e\u8f93\u5165\u6355\u83b7\u7684\u6ee4\u6ce2\u5668\uff0c\u8303\u56f4\u662f0X0~0XF\u3002\u8d8a\u5927\u6ee4\u6ce2\u6548\u679c\u8d8a\u597d\u3002\r\n\tTIM_ICInitStruture.TIM_ICFilter=0XF;\r\n\t\/\/\u8fb9\u6cbf\u68c0\u6d4b\u3001\u6781\u6027\u9009\u62e9\u3002\u6211\u4eec\u9009\u62e9\u4e0a\u5347\u6cbf\u89e6\u53d1\u3002\r\n\tTIM_ICInitStruture.TIM_ICPolarity=TIM_ICPolarity_Rising;\r\n\t\/\/\u6211\u4eec\u9700\u8981\u6bcf\u6b21\u89e6\u53d1\u90fd\u6709\u6548\uff0c\u6240\u4ee5\u5206\u9891\u5668\u9009\u62e9\u4e0d\u5206\u9891\u3002\r\n\tTIM_ICInitStruture.TIM_ICPrescaler=TIM_ICPSC_DIV1;\r\n\t\/\/\u9009\u62e9\u89e6\u53d1\u4fe1\u53f7\u4ece\u54ea\u4e2a\u5f15\u811a\u8f93\u5165\uff0c\u53ef\u4ee5\u9009\u62e9\u76f4\u8fde\u901a\u9053\u6216\u8005\u662f\u4ea4\u53c9\u901a\u9053\u3002\r\n\t\/\/\u6211\u4eec\u8fd9\u91cc\u9009\u62e9\u76f4\u8fde\u901a\u9053\u3002\r\n\tTIM_ICInitStruture.TIM_ICSelection=TIM_ICSelection_DirectTI;\r\n\tTIM_ICInit(TIM3,&TIM_ICInitStruture);\r\n\t\r\n\t\/\/\u9009\u62e9\u901a\u9053\uff0c\u9009\u62e9TIM3\u7684\u901a\u90532.\r\n\tTIM_ICInitStruture.TIM_Channel=TIM_Channel_2;\r\n\t\/\/\u914d\u7f6e\u8f93\u5165\u6355\u83b7\u7684\u6ee4\u6ce2\u5668\uff0c\u8303\u56f4\u662f0X0~0XF\u3002\u8d8a\u5927\u6ee4\u6ce2\u6548\u679c\u8d8a\u597d\u3002\r\n\tTIM_ICInitStruture.TIM_ICFilter=0XF;\r\n\t\/\/\u8fb9\u6cbf\u68c0\u6d4b\u3001\u6781\u6027\u9009\u62e9\u3002\u6211\u4eec\u9009\u62e9\u4e0b\u5347\u6cbf\u89e6\u53d1\u3002\r\n\tTIM_ICInitStruture.TIM_ICPolarity=TIM_ICPolarity_Falling;\r\n\t\/\/\u6211\u4eec\u9700\u8981\u6bcf\u6b21\u89e6\u53d1\u90fd\u6709\u6548\uff0c\u6240\u4ee5\u5206\u9891\u5668\u9009\u62e9\u4e0d\u5206\u9891\u3002\r\n\tTIM_ICInitStruture.TIM_ICPrescaler=TIM_ICPSC_DIV1;\r\n\t\/\/\u9009\u62e9\u89e6\u53d1\u4fe1\u53f7\u4ece\u54ea\u4e2a\u5f15\u811a\u8f93\u5165\uff0c\u53ef\u4ee5\u9009\u62e9\u76f4\u8fde\u901a\u9053\u6216\u8005\u662f\u4ea4\u53c9\u901a\u9053\u3002\r\n\t\/\/\u6211\u4eec\u8fd9\u91cc\u9009\u62e9\u4ea4\u53c9\u901a\u9053\u3002\r\n\tTIM_ICInitStruture.TIM_ICSelection=TIM_ICSelection_IndirectTI;\r\n\tTIM_ICInit(TIM3,&TIM_ICInitStruture);\r\n\t\r\n\t\/\/\u914d\u7f6eTRGI\u7684\u89e6\u53d1\u6e90\u4e3aTI1FP1\u3002\r\n\tTIM_SelectInputTrigger(TIM3,TIM_TS_TI1FP1);\r\n\t\r\n\t\/\/\u914d\u7f6e\u4ece\u6a21\u5f0f\u4e3aReset\u3002\r\n\tTIM_SelectSlaveMode(TIM3,TIM_SlaveMode_Reset);\r\n\t\r\n\t\/\/\u4f7f\u80fd\u5b9a\u65f6\u5668\r\n\tTIM_Cmd(TIM3,ENABLE);\r\n\t\/\/\u5f53\u6211\u4eec\u542f\u52a8\u5b9a\u65f6\u5668\u540e\uff0cCNT\u5c31\u4f1a\u5728\u5185\u90e8\u4e0d\u65ad\u81ea\u589e\uff0c\u5373\u4f7f\u4fe1\u53f7\u6ca1\u6709\u8fc7\u6765\uff0c\u4ed6\u4e5f\u4f1a\u4e0d\u65ad\u81ea\u589e\u3002\r\n\t\/\/CNT\u6709\u4fe1\u53f7\u6765\u7684\u65f6\u5019\uff0c\u4ed6\u5c31\u4f1a\u5728\u4ece\u6a21\u5f0f\u7684\u4f5c\u7528\u4e0b\u81ea\u52a8\u6e05\u96f6\u3002\r\n}<\/code><\/pre>\n
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<\/div><\/div><\/div>\n
\u6ca1\u9519\uff0cST\u516c\u53f8\u4e13\u95e8\u4e3aPWMI\u6a21\u5f0f\u5c01\u88c5\u4e86\u4e00\u4e2a\u51fd\u6570\uff0c\u5c31\u662f\u6211\u4eec\u4e4b\u524d\u5728<\/i>\u521d\u59cb\u5316\u8f93\u5165\u6355\u83b7\u5355\u5143\u5e93\u51fd\u6570\u8bf4\u8fc7\u7684TIM_PWMIConfig()\u3002<\/p>\n
\u8fd9\u6837\u53ea\u9700\u8981\u914d\u7f6e\u4e00\u4e2a\u901a\u9053\uff0c\u53e6\u4e00\u4e2a\u901a\u9053\u81ea\u52a8\u4f1a\u914d\u7f6e\u6210\u76f8\u53cd\u7684\u9009\u9879\uff0c\u8fd9\u6837\u4fbf\u6377\u4e86\u4ee3\u7801(\u5176\u5b9e\u5c31\u662f\u4e00\u5806if\u8bed\u53e5\u9009\u62e9)\u3002<\/p>\n
\u6bd4\u5982\u4f20\u5165\u7684\u662f\u901a\u90531\u3001\u76f4\u8fde\u3001\u4e0a\u5347\u6cbf\uff1b\u90a3\u51fd\u6570\u91cc\u9762\u4f1a\u987a\u5e26\u914d\u7f6e\u901a\u9053\u3001\u4ea4\u53c9\u3001\u4e0b\u964d\u6cbf\u3002<\/p>\n
 <\/p>\n
void IC_Init()\r\n{\r\n\t\/\/\u5f00\u542f\u65f6\u949f\uff0c\u6211\u4eec\u4f7f\u7528TIM3\u6765\u6355\u83b7PWM\u6ce2\u3002\r\n\tRCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);\r\n\tRCC_APB1PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);\r\n\t\/\/\u914d\u7f6eGPIO\uff0cPA6\u6539\u6210\u4e0a\u62c9\u8f93\u5165\u3002\r\n\tGPIO_InitTypeDef GPIO_InitStruture;\r\n\tGPIO_InitStruture.GPIO_Mode=GPIO_Mode_IPU;\r\n\tGPIO_InitStruture.GPIO_Pin=GPIO_Pin_6;\r\n\tGPIO_Init(GPIOA,&GPIO_InitStruture);\r\n\t\/\/\u9009\u62e9\u65f6\u57fa\u5355\u5143\u65f6\u949f\r\n\tTIM_InternalClockConfig(TIM3);\r\n\t\/\/\u914d\u7f6e\u65f6\u57fa\u5355\u5143,\u4f7f\u5f97\u8ba1\u6570\u5668\u6ea2\u51fa\u9891\u7387\u4e3a1KHz\uff0c\u8ba1\u6570\u5668\u7684\u6ea2\u51fa\u9891\u7387 = PWM\u7684\u9891\u7387 =1KHz\r\n\tTIM_TimeBaseInitTypeDef TIM_TimeBaseStruture;\r\n\tTIM_TimeBaseStruture.TIM_ClockDivision=TIM_CKD_DIV1;\r\n\tTIM_TimeBaseStruture.TIM_CounterMode=TIM_CounterMode_Up;\r\n\t\/\/ARR\u7684\u503c\u6700\u597d\u8bbe\u7f6e\u7684\u5927\u4e00\u4e9b\uff0c\u9632\u6b62\u8ba1\u6570\u6ea2\u51fa\uff0c\u8fd9\u91cc\u7ed9\u6700\u5927\u503c65536-1\uff0c\u6ee1\u91cf\u7a0b\u8ba1\u6570\u3002\r\n\tTIM_TimeBaseStruture.TIM_Period=65536 -1; \r\n\t\/\/\u8fd9\u91cc\u7684PSC\u51b3\u5b9a\u4e86\u6d4b\u5468\u6cd5\u7684\u6807\u51c6\u9891\u7387fc\u3002\u6211\u4eec\u7ed9\u7684\u6807\u51c6\u9891\u7387\u662f1MHz\u3002\r\n\tTIM_TimeBaseStruture.TIM_Prescaler=72-1;\r\n\tTIM_TimeBaseStruture.TIM_RepetitionCounter=0;\r\n\tTIM_TimeBaseInit(TIM3,&TIM_TimeBaseStruture);\r\n\t\r\n\t\/\/\u521d\u59cb\u5316\u8f93\u5165\u6355\u83b7\u5355\u5143\u3002\r\n\tTIM_ICInitTypeDef TIM_ICInitStruture;\r\n\t\/\/\u9009\u62e9\u901a\u9053\uff0c\u9009\u62e9TIM3\u7684\u901a\u90531.\r\n\tTIM_ICInitStruture.TIM_Channel=TIM_Channel_1;\r\n\t\/\/\u914d\u7f6e\u8f93\u5165\u6355\u83b7\u7684\u6ee4\u6ce2\u5668\uff0c\u8303\u56f4\u662f0X0~0XF\u3002\u8d8a\u5927\u6ee4\u6ce2\u6548\u679c\u8d8a\u597d\u3002\r\n\tTIM_ICInitStruture.TIM_ICFilter=0XF;\r\n\t\/\/\u8fb9\u6cbf\u68c0\u6d4b\u3001\u6781\u6027\u9009\u62e9\u3002\u6211\u4eec\u9009\u62e9\u4e0a\u5347\u6cbf\u89e6\u53d1\u3002\r\n\tTIM_ICInitStruture.TIM_ICPolarity=TIM_ICPolarity_Rising;\r\n\t\/\/\u6211\u4eec\u9700\u8981\u6bcf\u6b21\u89e6\u53d1\u90fd\u6709\u6548\uff0c\u6240\u4ee5\u5206\u9891\u5668\u9009\u62e9\u4e0d\u5206\u9891\u3002\r\n\tTIM_ICInitStruture.TIM_ICPrescaler=TIM_ICPSC_DIV1;\r\n\t\/\/\u9009\u62e9\u89e6\u53d1\u4fe1\u53f7\u4ece\u54ea\u4e2a\u5f15\u811a\u8f93\u5165\uff0c\u53ef\u4ee5\u9009\u62e9\u76f4\u8fde\u901a\u9053\u6216\u8005\u662f\u4ea4\u53c9\u901a\u9053\u3002\r\n\t\/\/\u6211\u4eec\u8fd9\u91cc\u9009\u62e9\u76f4\u8fde\u901a\u9053\u3002\r\n\tTIM_ICInitStruture.TIM_ICSelection=TIM_ICSelection_DirectTI;\r\n\tTIM_PWMIConfig(TIM3,&TIM_ICInitStruture);\r\n\t\r\n\t\/\/\u914d\u7f6eTRGI\u7684\u89e6\u53d1\u6e90\u4e3aTI1FP1\u3002\r\n\tTIM_SelectInputTrigger(TIM3,TIM_TS_TI1FP1);\r\n\t\r\n\t\/\/\u914d\u7f6e\u4ece\u6a21\u5f0f\u4e3aReset\u3002\r\n\tTIM_SelectSlaveMode(TIM3,TIM_SlaveMode_Reset);\r\n\t\r\n\t\/\/\u4f7f\u80fd\u5b9a\u65f6\u5668\r\n\tTIM_Cmd(TIM3,ENABLE);\r\n\t\/\/\u5f53\u6211\u4eec\u542f\u52a8\u5b9a\u65f6\u5668\u540e\uff0cCNT\u5c31\u4f1a\u5728\u5185\u90e8\u4e0d\u65ad\u81ea\u589e\uff0c\u5373\u4f7f\u4fe1\u53f7\u6ca1\u6709\u8fc7\u6765\uff0c\u4ed6\u4e5f\u4f1a\u4e0d\u65ad\u81ea\u589e\u3002\r\n\t\/\/CNT\u6709\u4fe1\u53f7\u6765\u7684\u65f6\u5019\uff0c\u4ed6\u5c31\u4f1a\u5728\u4ece\u6a21\u5f0f\u7684\u4f5c\u7528\u4e0b\u81ea\u52a8\u6e05\u96f6\u3002\r\n}\r\n\r\n\/\/\u5f53\u6211\u4eec\u60f3\u8981\u67e5\u770b\u9891\u7387\uff0c\u9700\u8981\u8bfb\u53d6CCR\u8fdb\u884c\u8ba1\u7b97\u3002\r\nuint32_t IC_GetFreq()\r\n{\r\n\treturn 1000000 \/ (TIM_GetCapture1(TIM3)+1);\r\n}\r\n\r\n\/\/\u83b7\u53d6\u5360\u7a7a\u6bd4\u7684\u51fd\u6570\r\nuint32_t IC_GetDuty()\r\n{\r\n\t\/\/\u7ecf\u8fc7\u5b9e\u6d4bCCR\u4f1a\u5c11\u4e00\u4e2a\u6570\uff0c\u6240\u4ee5CCR\u5404\u52a0\u4e00\u4e2a\u6570\u3002\r\n\treturn (TIM_GetCapture2(TIM3)+1)*100\/ (TIM_GetCapture1(TIM3)+1);\r\n}\r\n<\/code><\/pre>\n
 <\/p>\n
\u6700\u540e\uff0c\u6211\u4eec\u6765\u7814\u7a76\u4e00\u4e0b\u8fd9\u4e2a\u6d4b\u9891\u7387\u7684\u6027\u80fd\uff0c\u9996\u5148\u662f\u6d4b\u9891\u7387\u7684\u8303\u56f4\uff0c\u76ee\u524d\u6211\u4eec\u7ed9\u7684\u6807\u51c6\u9891\u7387\u662f1MHz\uff0c\u8ba1\u6570\u5668\u6700\u5927\u53ea\u80fd\u8ba1\u523065535\uff0c\u6240\u4ee5\u6240\u6d4b\u91cf\u7684\u6700\u4f4e\u9891\u7387\u662f1M\/65535\uff0c\u8fd9\u4e2a\u503c\u7b97\u4e00\u4e0b\u5927\u6982\u662f15Hz\u3002\u5982\u679c\u9891\u7387\u518d\u4f4e\uff0c\u8ba1\u6570\u5668\u5c31\u8981\u6ea2\u51fa\u4e86\u3002\u5982\u679c\u60f3\u8981\u6d4b\u91cf\u7684\u9891\u7387\u6bd415Hz\u8fd8\u4f4e\uff0c\u90a3\u5c31\u8981\u628a\u9884\u5206\u9891\u5668\u76841MHz\u518d\u52a0\u5927\u4e00\u4e9b\u3002<\/p>\n
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