\u8bbe\u7f6e-\u6e05\u9664\u6a21\u5f0f：\u9700\u624b\u52a8\u91cd\u65b0\u4f7f\u80fd\u4ee5\u89e6\u53d1\u4e0b\u4e00\u6b21\u8ba1\u6570\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\u516d\u3001EPIT\u5bc4\u5b58\u5668\u914d\u7f6e\u5173\u952e\u6b65\u9aa4<\/h4>\n
\u65f6\u949f\u4f7f\u80fd\u4e0e\u57fa\u7840\u914d\u7f6e<\/p>\n
\/\/ \u4f7f\u80fdEPIT\u65f6\u949f
\nCCM->CCGR1 |= CCM_CCGR1_EPIT1(3); \/\/ \u5047\u8bbe\u4f7f\u7528EPIT1<\/p>\n
\/\/ \u914d\u7f6eEPIT\u63a7\u5236\u5bc4\u5b58\u5668（EPIT_CR）
\nEPIT1->CR = EPIT_CR_ENMOD | \/\/ \u4f7f\u80fd\u65f6\u52a0\u8f7d\u521d\u59cb\u503c
\n EPIT_CR_CLKSRC(1) | \/\/ \u9009\u62e9IPG\u65f6\u949f
\n EPIT_CR_PRESCALAR(24); \/\/ \u5206\u9891\u7cfb\u657025（24+1）<\/p>\n
\u8bbe\u7f6e\u8ba1\u6570\u5668\u521d\u59cb\u503c\u4e0e\u6bd4\u8f83\u503c<\/p>\n
EPIT1->LR = 1000000; \/\/ \u521d\u59cb\u8ba1\u6570\u503c
\nEPIT1->CMPR = 0; \/\/ \u6bd4\u8f83\u503c\u8bbe\u4e3a0（\u89e6\u53d1\u4e2d\u65ad）<\/p>\n
\u4e2d\u65ad\u914d\u7f6e\u4e0e\u4f7f\u80fd<\/p>\n
\/\/ \u4f7f\u80fdEPIT\u4e2d\u65ad
\nEPIT1->CR |= EPIT_CR_OCIEN; <\/p>\n
\/\/ \u5728NVIC\u4e2d\u6ce8\u518c\u4e2d\u65ad
\nNVIC_EnableIRQ(EPIT1_IRQn);<\/p>\n
\u4e2d\u65ad\u670d\u52a1\u4f8b\u7a0b\u793a\u4f8b<\/p>\n
void EPIT1_IRQHandler(void) {
\n if (EPIT1->SR & EPIT_SR_OCIF) { \/\/ \u68c0\u67e5\u4e2d\u65ad\u6807\u5fd7
\n EPIT1->SR |= EPIT_SR_OCIF; \/\/ \u6e05\u9664\u6807\u5fd7
\n \/\/ \u7528\u6237\u81ea\u5b9a\u4e49\u5904\u7406\u903b\u8f91
\n }
\n}<\/p>\n
\u8ba1\u7b97\u5b9a\u65f6\u5468\u671f<\/p>\n
\u5b9a\u65f6\u5468\u671f\u516c\u5f0f： [ T = \\\\frac{(PRESCALAR + 1) \\\\times (LOAD_VALUE + 1)}{CLK_FREQ} ]<\/p>\n
\u5047\u8bbe：<\/p>\n
\n- IPG\u65f6\u949f\u9891\u7387\u4e3a66MHz<\/li>\n
- \u9884\u5206\u9891\u503c\u8bbe\u4e3a24（\u5b9e\u9645\u5206\u989125）<\/li>\n
- \u52a0\u8f7d\u503c\u4e3a1,000,000<\/li>\n<\/ul>\n
\u8ba1\u7b97\u793a\u4f8b： [ T = \\\\frac{25 \\\\times 1,000,001}{66,000,000} \\\\approx 0.3788 \\\\text{\u79d2} ]<\/p>\n
<\/h4>\n<\/h4>\n","protected":false},"excerpt":{"rendered":"
\u4e00\u3001\u4e2d\u65ad\u6982\u8ff0\u4e2d\u65ad（Interrupt）\u00a0\u662f\u5904\u7406\u5668\u5728\u6267\u884c\u7a0b\u5e8f\u8fc7\u7a0b\u4e2d，\u54cd\u5e94\u5185\u90e8\u6216\u5916\u90e8\u7d27\u6025\u4e8b\u4ef6\u7684\u673a\u5236\u3002\u5f53\u53d1\u751f\u9700\u8981\u5904\u7406\u5668\u7acb\u5373\u5904\u7406\u7684\u4e8b\u4ef6\u65f6，\u5904\u7406\u5668\u4f1a\u6682\u65f6\u4e2d\u65ad\u5f53\u524d\u6b63\u5728\u6267\u884c\u7684\u7a0b\u5e8f，\u8f6c\u53bb\u6267\u884c\u5904\u7406\u8be5\u4e8b\u4ef6\u7684\u7279\u6b8a\u7a0b\u5e8f（\u4e2d\u65ad\u670d\u52a1\u7a0b\u5e8f），\u6267\u884c\u5b8c\u6bd5\u540e\u518d\u8fd4\u56de\u539f\u7a0b\u5e8f\u7ee7\u7eed\u6267\u884c\u3002\u4e8c\u3001\u4e2d\u65ad\u7c7b\u578b\u4e0e\u5206\u7c7b\u786c\u4ef6\u4e2d\u65ad：\u7531\u5916\u8bbe\u89e6\u53d1（\u5982GPIO\u3001UART\u3001\u5b9a\u65f6\u5668\u7b49）ÿ<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[270,269],"topic":[],"class_list":["post-67690","post","type-post","status-publish","format-standard","hentry","category-server","tag-270","tag-269"],"yoast_head":"\n
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