{"id":87392,"date":"2026-07-30T08:56:44","date_gmt":"2026-07-30T00:56:44","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/87392.html"},"modified":"2026-07-30T08:56:44","modified_gmt":"2026-07-30T00:56:44","slug":"%e5%b5%8c%e5%85%a5%e5%bc%8f%e5%bc%82%e6%ad%a5%e4%ba%8b%e4%bb%b6%e5%a4%84%e7%90%86%e5%ae%9e%e6%88%98%ef%bc%9a%e4%bb%8e%e4%b8%ad%e6%96%ad%e6%ad%bb%e9%94%81%e5%88%b0%e7%8e%af%e5%bd%a2%e9%98%9f%e5%88%97","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/87392.html","title":{"rendered":"\u5d4c\u5165\u5f0f\u5f02\u6b65\u4e8b\u4ef6\u5904\u7406\u5b9e\u6218\uff1a\u4ece\u4e2d\u65ad\u6b7b\u9501\u5230\u73af\u5f62\u961f\u5217\u5206\u53d1"},"content":{"rendered":"

\u4e0a\u4e00\u7bc7\u804a\u4e86\u4e3a\u4ec0\u4e48\u8be5\u628a while(1) \u8f6e\u8be2\u6362\u6210\u4e8b\u4ef6\u9a71\u52a8，\u7559\u4e86\u4e2a\u94a9\u5b50\u8bf4"\u4e2d\u65ad\u91cc\u5230\u5e95\u4e0d\u80fd\u5e72\u4ec0\u4e48\u4e8b，\u90a3\u624d\u662f\u4e8b\u4ef6\u9a71\u52a8\u80fd\u8dd1\u7a33\u7684\u771f\u6b63\u547d\u95e8"\u3002\u8fd9\u7bc7\u5c31\u6765\u586b\u8fd9\u4e2a\u5751\u3002<\/p>\n

\u5148\u8bf4\u4e00\u4e2a\u6211\u4eb2\u8eab\u8e29\u8fc7\u7684 Bug\u3002\u6309\u952e GPIO \u4e2d\u65ad\u56de\u8c03\u91cc，\u6211\u56fe\u7701\u4e8b\u76f4\u63a5\u8c03\u4e86 LCD \u5237\u65b0\u51fd\u6570，\u5e95\u5c42\u662f SPI + DMA\u3002\u7ed3\u679c\u6309\u952e\u6309\u51e0\u4e0b\u7cfb\u7edf\u5c31\u5361\u6b7b，\u590d\u4f4d\u90fd\u6765\u4e0d\u53ca\u3002\u67e5\u4e86\u4e24\u5929\u624d\u641e\u660e\u767d：\u4e2d\u65ad\u5d4c\u5957\u6b7b\u9501\u4e86\u3002<\/p>\n

\u8fd9\u79cd Bug \u7684\u53ef\u6015\u4e4b\u5904\u5728\u4e8e，\u5b83\u4e0d\u662f"\u529f\u80fd\u5199\u9519\u4e86"\u90a3\u79cd\u4e00\u773c\u80fd\u770b\u51fa\u7684\u9519，\u800c\u662f"\u4ee3\u7801\u80fd\u8dd1，\u4f46\u8dd1\u7740\u8dd1\u7740\u5c31\u6b7b"\u3002\u4eca\u5929\u5c31\u628a\u4e2d\u65ad\u91cc\u80fd\u8e29\u7684\u96f7\u3001\u4e3a\u4ec0\u4e48\u8e29\u3001\u600e\u4e48\u5f7b\u5e95\u8eb2\u5f00，\u4e00\u6b21\u8bb2\u900f\u3002<\/p>\n

\"\u90a3\u4e2a\u5361\u6b7b\u7684Bug\uff1a\u6309\u952eISR\u8c03LCD\u5237\u65b0\u5bfc\u81f4\u4e2d\u65ad\u5d4c\u5957\u6b7b\u9501\u7684\u65f6\u95f4\u7ebf\"<\/p>\n

\u90a3\u4e2a\u5361\u6b7b\u7684 Bug，\u5230\u5e95\u53d1\u751f\u4e86\u4ec0\u4e48<\/h3>\n

\u8fd8\u539f\u4e00\u4e0b\u73b0\u573a\u3002\u6309\u952e\u63a5\u5728 GPIO \u4e0a，\u914d\u4e86\u4e0b\u964d\u6cbf\u4e2d\u65ad\u3002\u4e2d\u65ad\u56de\u8c03\u91cc\u6211\u5199\u4e86\u4e09\u884c：\u8bfb\u952e\u503c\u3001\u5237\u65b0\u4e00\u4e0b LCD（\u628a\u6309\u952e\u72b6\u6001\u663e\u793a\u51fa\u6765）\u3001\u6e05\u6807\u5fd7\u3002\u770b\u8d77\u6765\u4eba\u755c\u65e0\u5bb3\u3002<\/p>\n

\u5237\u65b0 LCD \u8fd9\u4e2a\u51fd\u6570\u5e95\u5c42\u662f SPI \u53d1\u4e00\u5c4f\u6570\u636e，\u7528 DMA \u642c\u3002DMA \u4f20\u8f93\u9700\u8981\u65f6\u95f4，\u51fd\u6570\u91cc\u6211\u7b49\u5b83\u5b8c\u6210\u624d\u8fd4\u56de\u3002\u95ee\u9898\u5c31\u51fa\u5728\u8fd9\u4e2a"\u7b49"\u4e0a\u3002<\/p>\n

\u6309\u952e\u4e2d\u65ad\u7684\u4f18\u5148\u7ea7\u6bd4 SPI \u7684 DMA \u5b8c\u6210\u4e2d\u65ad\u9ad8\u3002\u6211\u8fdb\u4e86\u6309\u952e ISR，\u5728\u91cc\u9762\u7b49 DMA \u5b8c\u6210，DMA \u5b8c\u6210\u8981\u89e6\u53d1\u81ea\u5df1\u7684\u4e2d\u65ad\u901a\u77e5\u6211，\u53ef\u90a3\u4e2a\u4e2d\u65ad\u4f18\u5148\u7ea7\u4f4e，\u88ab\u6309\u952e ISR \u5835\u5728\u5916\u9762\u8fdb\u4e0d\u6765\u3002DMA \u5b8c\u6210\u4e2d\u65ad\u8fdb\u4e0d\u6765，\u5b8c\u6210\u6807\u5fd7\u5c31\u6e05\u4e0d\u6389，\u6211\u5c31\u4e00\u76f4\u7b49\u3002\u6b7b\u9501，\u7cfb\u7edf\u5361\u6b7b\u3002<\/p>\n

\u8fd9\u662f\u4e2a\u5178\u578b\u7684"\u4e2d\u65ad\u91cc\u5e72\u91cd\u6d3b"\u7ffb\u8f66\u73b0\u573a\u3002\u6839\u5b50\u4e0d\u5728\u67d0\u4e00\u884c\u4ee3\u7801\u5199\u9519，\u5728\u4e8e\u8fdd\u80cc\u4e86\u4e2d\u65ad\u4e0a\u4e0b\u6587\u7684\u4e00\u6761\u94c1\u5f8b\u3002<\/p>\n

\u4e2d\u65ad\u4e0a\u4e0b\u6587\u7684\u4e09\u6761\u94c1\u5f8b<\/h3>\n

\u628a\u89c4\u77e9\u7acb\u6e05\u695a，\u540e\u9762\u6240\u6709\u8bbe\u8ba1\u90fd\u56f4\u7740\u5b83\u8f6c\u3002<\/p>\n

\u7b2c\u4e00\u6761，\u4e0d\u80fd\u963b\u585e\u3002 \u4e2d\u65ad\u91cc\u4e0d\u80fd\u6709\u4efb\u4f55"\u7b49"\u7684\u52a8\u4f5c\u3002\u7b49 DMA\u3001\u7b49 SPI \u603b\u7ebf\u7a7a\u95f2\u3001\u7b49\u4e00\u4e2a\u4fe1\u53f7\u91cf\u3001\u8c03\u4e00\u4e2a\u4f1a sleep \u7684\u51fd\u6570，\u5168\u90fd\u4e0d\u884c\u3002\u4e2d\u65ad\u662f\u62a2\u5360\u4e3b\u5faa\u73af\u8dd1\u7684，\u4f60\u4e00\u7b49，\u4e3b\u5faa\u73af\u548c\u6240\u6709\u4f4e\u4f18\u5148\u7ea7\u4e2d\u65ad\u5168\u5f97\u966a\u4f60\u7b49，\u5b9e\u65f6\u6027\u5f53\u573a\u5d29\u584c\u3002<\/p>\n

\u7b2c\u4e8c\u6761，\u5feb\u8fdb\u5feb\u51fa\u3002 \u8fdb\u4e2d\u65ad\u3001\u5e72\u5b8c\u8be5\u5e72\u7684\u3001\u7acb\u523b\u51fa\u53bb\u3002\u7406\u60f3\u7684\u4e2d\u65ad\u5904\u7406\u65f6\u95f4\u662f\u51e0\u4e2a\u5fae\u79d2\u5230\u51e0\u5341\u5fae\u79d2\u3002\u5224\u65ad\u6807\u51c6\u5f88\u7b80\u5355：\u4f60\u62ff\u793a\u6ce2\u5668\u91cf\u4e2d\u65ad\u5f15\u811a，\u4e2d\u65ad\u54cd\u5e94\u5230\u8fd4\u56de\u7684\u65f6\u95f4，\u522b\u8d85\u8fc7\u4f60\u7cfb\u7edf\u80fd\u5bb9\u5fcd\u7684\u6700\u5c0f\u4e8b\u4ef6\u95f4\u9694\u3002<\/p>\n

\u7b2c\u4e09\u6761，\u8d44\u6e90\u53d7\u9650\u3002 \u4e2d\u65ad\u91cc\u4e0d\u80fd\u7528\u4efb\u4f55"\u4e0d\u53ef\u91cd\u5165"\u7684\u51fd\u6570\u3002malloc\u3001printf\u3001\u5e26\u9501\u7684\u5171\u4eab\u8d44\u6e90，\u8fd9\u4e9b\u5728\u4e2d\u65ad\u91cc\u78b0\u4e86\u5c31\u662f\u5b9a\u65f6\u70b8\u5f39\u3002\u6808\u7a7a\u95f4\u4e5f\u5c0f，\u4e2d\u65ad\u6808\u901a\u5e38\u6bd4\u4efb\u52a1\u6808\u5c0f\u5f97\u591a，\u9012\u5f52\u8c03\u7528\u51e0\u5c42\u5c31\u6ea2\u51fa\u3002<\/p>\n

\u8fd9\u4e09\u6761\u5f52\u7ed3\u6210\u4e00\u53e5\u8bdd：\u4e2d\u65ad\u53ea\u505a\u6700\u8f7b\u7684\u6d3b，\u91cd\u6d3b\u5168\u7529\u7ed9\u4e3b\u5faa\u73af\u3002<\/p>\n

\"\u4e2d\u65ad\u4e0a\u4e0b\u6587\u4e09\u94c1\u5f8b\uff1a\u4e0d\u80fd\u963b\u585e\/\u5feb\u8fdb\u5feb\u51fa\/\u8d44\u6e90\u53d7\u9650\uff0c\u6bcf\u6761\u914d\u53cd\u9762\u6848\u4f8b\"<\/p>\n

\u5f02\u6b65\u4e8b\u4ef6\u5904\u7406：\u628a"\u7b49"\u53d8\u6210"\u901a\u77e5"<\/h3>\n

\u65e2\u7136\u4e2d\u65ad\u91cc\u4e0d\u80fd\u5e72\u91cd\u6d3b，\u90a3\u91cd\u6d3b\u8c01\u6765\u5e72？\u4e3b\u5faa\u73af\u3002\u53ef\u4e2d\u65ad\u548c\u4e3b\u5faa\u73af\u600e\u4e48\u4ea4\u63a5？\u603b\u4e0d\u80fd\u4e2d\u65ad\u91cc\u76f4\u63a5\u8c03\u4e3b\u5faa\u73af\u7684\u51fd\u6570，\u90a3\u4e0d\u53c8\u56de\u5230\u8001\u8def\u4e86\u3002<\/p>\n

\u7b54\u6848\u662f\u5f02\u6b65\u4e8b\u4ef6\u5904\u7406\u3002\u601d\u8def\u4e00\u53e5\u8bdd：\u751f\u4ea7\u8005（\u4e2d\u65ad）\u53ea\u7ba1\u628a"\u6709\u4e8b\u53d1\u751f"\u8fd9\u4ef6\u4e8b\u4e22\u8fdb\u961f\u5217\u5c31\u8fd4\u56de，\u6d88\u8d39\u8005（\u4e3b\u5faa\u73af）\u4ece\u961f\u5217\u91cc\u53d6\u51fa\u6765\u6162\u6162\u5904\u7406\u3002<\/p>\n

\u6253\u4e2a\u6bd4\u65b9\u3002\u4f60\u5feb\u9012\u5230\u4e86，\u5feb\u9012\u5458\u4e0d\u4f1a\u5728\u4f60\u5bb6\u95e8\u53e3\u7b49\u4f60\u7b7e\u6536\u5b8c\u518d\u8d70（\u90a3\u662f\u540c\u6b65，\u5feb\u9012\u5458\u88ab\u4f60\u963b\u585e\u4e86）\u3002\u4ed6\u6309\u4e2a\u95e8\u94c3\u7559\u4e2a\u6761\u5c31\u8d70\u4e86（\u6295\u9012\u4e8b\u4ef6），\u4f60\u56de\u5bb6\u770b\u5230\u6761\u5b50\u518d\u53bb\u53d6（\u5904\u7406\u4e8b\u4ef6）\u3002\u5feb\u9012\u5458\u548c\u4f60\u5404\u5e72\u5404\u7684，\u8c01\u4e5f\u4e0d\u7b49\u8c01\u3002<\/p>\n

\u4e2d\u65ad\u548c\u4e3b\u5faa\u73af\u5c31\u662f\u8fd9\u4e2a\u5173\u7cfb\u3002\u4e2d\u65ad\u662f\u5feb\u9012\u5458，\u95e8\u94c3\u6761\u5b50\u5c31\u662f\u4e8b\u4ef6，\u961f\u5217\u662f\u4fe1\u7bb1，\u4e3b\u5faa\u73af\u662f\u4f60\u3002\u8fd9\u5957\u673a\u5236\u8ba9\u4e2d\u65ad\u80fd\u771f\u6b63\u505a\u5230\u5feb\u8fdb\u5feb\u51fa，\u91cd\u6d3b\u5168\u5728\u4e3b\u5faa\u73af\u7684\u5b89\u5168\u4e0a\u4e0b\u6587\u91cc\u6162\u6162\u5e72\u3002<\/p>\n

\u4e0b\u9762\u52a8\u624b\u5b9e\u73b0\u4e00\u4e2a，\u88f8\u673a\u5c31\u80fd\u8dd1，\u4e0d\u5230 100 \u884c\u3002<\/p>\n

\u4e8b\u4ef6\u7c7b\u578b：\u5148\u8bf4\u6e05\u695a\u6709\u54ea\u4e9b\u4e8b<\/h3>\n

\u4e8b\u4ef6\u7528\u4e00\u4e2a\u679a\u4e3e\u5217\u6e05\u695a，\u522b\u5230\u5904\u5199\u9b54\u6cd5\u6570\u5b57\u3002<\/p>\n

enum {
\n EVT_NONE = 0,
\n EVT_KEY, \/* \u6309\u952e\u4e8b\u4ef6，param = \u952e\u503c *\/
\n EVT_SENSOR_READY, \/* \u4f20\u611f\u5668\u5c31\u7eea，param = \u901a\u9053 *\/
\n EVT_UART_RX, \/* \u4e32\u53e3\u6536\u5230\u6570\u636e，param = \u957f\u5ea6 *\/
\n EVT_TIMER_TICK, \/* \u8f6f\u4ef6\u5b9a\u65f6\u5668\u5230\u70b9 *\/
\n EVT_LCD_REFRESH, \/* LCD \u5f85\u5237\u65b0（\u4e3b\u5faa\u73af\u6d88\u8d39） *\/
\n};<\/p>\n

\u6709\u4eba\u559c\u6b22\u628a\u4e8b\u4ef6\u7c7b\u578b\u548c\u53c2\u6570\u585e\u8fdb\u4e00\u4e2a 32 \u4f4d\u6574\u6570\u91cc\u7701\u7a7a\u95f4，\u6211\u4e0d\u63a8\u8350\u3002\u53ef\u8bfb\u6027\u6bd4\u90a3\u51e0\u4e2a\u5b57\u8282\u91cd\u8981\u5f97\u591a，\u679a\u4e3e\u52a0\u4e00\u4e2a param \u5b57\u6bb5，\u8c03\u8bd5\u65f6\u4e00\u773c\u80fd\u770b\u51fa\u662f\u4ec0\u4e48\u4e8b\u4ef6\u5e26\u4e86\u4ec0\u4e48\u53c2\u6570\u3002<\/p>\n

\u73af\u5f62\u961f\u5217：\u5355\u8bfb\u5355\u5199，\u5929\u7136\u514d\u9501<\/h3>\n

\u8fd9\u662f\u6574\u4e2a\u7cfb\u7edf\u7684\u54bd\u5589\u3002\u4e2d\u65ad\u5f80\u91cc\u5199，\u4e3b\u5faa\u73af\u4ece\u91cc\u8bfb，\u4e24\u8fb9\u5e76\u53d1\u8bbf\u95ee，\u8981\u4e0d\u8981\u52a0\u9501？<\/p>\n

\u4e0d\u9700\u8981\u3002\u56e0\u4e3a\u8fd9\u662f\u5355\u751f\u4ea7\u8005\u5355\u6d88\u8d39\u8005\u7ed3\u6784：\u53ea\u6709\u4e2d\u65ad\u8fd9\u4e00\u4e2a\u5199\u8005，\u53ea\u6709\u4e3b\u5faa\u73af\u8fd9\u4e00\u4e2a\u8bfb\u8005\u3002\u8fd9\u79cd\u7ed3\u6784\u4e0b，head \u6307\u9488\u53ea\u6709\u4e2d\u65ad\u6539，tail \u6307\u9488\u53ea\u6709\u4e3b\u5faa\u73af\u6539，\u5404\u7ba1\u5404\u7684，\u5929\u7136\u6ca1\u6709\u7ade\u4e89\u3002<\/p>\n

#define EVT_QUEUE_SIZE 32<\/p>\n

typedef struct {
\n uint16_t type;
\n uint16_t param;
\n} event_t;<\/p>\n

static event_t evt_queue[EVT_QUEUE_SIZE];
\nstatic volatile uint16_t q_head; \/* \u4e2d\u65ad\u5199，\u4e3b\u5faa\u73af\u53ea\u8bfb *\/
\nstatic volatile uint16_t q_tail; \/* \u4e3b\u5faa\u73af\u5199，\u4e2d\u65ad\u53ea\u8bfb *\/<\/p>\n

\/* \u4e2d\u65ad\u91cc\u8c03：\u6295\u9012\u4e8b\u4ef6，O(1) *\/
\nvoid event_post(uint16_t type, uint16_t param)
\n{
\n uint16_t next = (q_head + 1) % EVT_QUEUE_SIZE;
\n if (next == q_tail) return; \/* \u6ee1\u4e86\u76f4\u63a5\u4e22，\u7edd\u4e0d\u963b\u585e\u4e2d\u65ad *\/
\n evt_queue[q_head].type = type;
\n evt_queue[q_head].param = param;
\n q_head = next;
\n}<\/p>\n

\/* \u4e3b\u5faa\u73af\u91cc\u8c03：\u53d6\u4e8b\u4ef6 *\/
\nint event_get(event_t *out)
\n{
\n if (q_tail == q_head) return 0; \/* \u7a7a *\/
\n out->type = evt_queue[q_tail].type;
\n out->param = evt_queue[q_tail].param;
\n q_tail = (q_tail + 1) % EVT_QUEUE_SIZE;
\n return 1;
\n}<\/p>\n

\u4e24\u4e2a\u7ec6\u8282\u503c\u5f97\u8bf4\u3002\u4e00\u662f volatile，head \u548c tail \u88ab\u4e2d\u65ad\u548c\u4e3b\u5faa\u73af\u4ea4\u53c9\u8bbf\u95ee，\u5fc5\u987b\u52a0 volatile \u9632\u6b62\u7f16\u8bd1\u5668\u628a\u5b83\u4f18\u5316\u8fdb\u5bc4\u5b58\u5668\u3002\u4e8c\u662f"\u6ee1\u4e86\u76f4\u63a5\u4e22"，\u8fd9\u662f\u94c1\u5f8b\u7684\u5ef6\u4f38，\u4e2d\u65ad\u91cc\u7edd\u5bf9\u4e0d\u80fd\u7b49\u961f\u5217\u7a7a\u51fa\u6765，\u4e22\u4e86\u603b\u6bd4\u5361\u6b7b\u5f3a，\u4e22\u7684\u4e8b\u4ef6\u9760\u4e0a\u5c42\u91cd\u4f20\u6216\u8d85\u65f6\u91cd\u53d1\u515c\u5e95\u3002<\/p>\n

\u961f\u5217\u5927\u5c0f\u6309\u4e8b\u4ef6\u7a81\u53d1\u91cf\u5b9a\u3002\u6309\u952e\u52a0\u4e32\u53e3\u8fd9\u79cd\u6162\u8bbe\u5907 32 \u591f\u7528，\u9ad8\u9891\u4f20\u611f\u5668\u53ef\u80fd\u8981\u5f00\u5230 128\u3002\u5b81\u53ef\u591a\u5360\u70b9 RAM，\u4e5f\u522b\u5728\u751f\u4ea7\u73af\u5883\u56e0\u4e3a\u961f\u5217\u592a\u5c0f\u4e22\u5173\u952e\u4e8b\u4ef6\u3002<\/p>\n

\"\u73af\u5f62\u961f\u5217\u5355\u8bfb\u5355\u5199\u514d\u9501\uff1a\u4e2d\u65ad\u5199head\u3001\u4e3b\u5faa\u73af\u5199tail\u3001volatile\u6807\u6ce8\u3001\u6ee1\u5219\u4e22\u7b56\u7565\"<\/p>\n

\u51fd\u6570\u6307\u9488\u8868：O(1) \u5206\u53d1，\u8c01\u5173\u5fc3\u8c01\u6ce8\u518c<\/h3>\n

\u4e8b\u4ef6\u53d6\u51fa\u6765\u4e86，\u8c01\u5904\u7406？\u5199\u4e00\u957f\u4e32 if-else \u53c8\u56de\u5230\u8001\u8def\u3002\u7528\u51fd\u6570\u6307\u9488\u8868：\u6bcf\u4e2a\u6a21\u5757\u521d\u59cb\u5316\u65f6\u628a\u81ea\u5df1\u5173\u5fc3\u7684\u4e8b\u4ef6\u7c7b\u578b\u548c\u56de\u8c03\u51fd\u6570\u6ce8\u518c\u8fdb\u53bb，\u5206\u53d1\u65f6\u6309 type \u67e5\u8868\u56de\u8c03\u3002<\/p>\n

#define MAX_HANDLERS 16
\ntypedef void (*handler_t)(event_t *evt);<\/p>\n

static handler_t handlers[MAX_HANDLERS];
\nstatic uint16_t handler_evt[MAX_HANDLERS];
\nstatic uint8_t handler_cnt;<\/p>\n

void event_register(uint16_t type, handler_t fn)
\n{
\n if (handler_cnt < MAX_HANDLERS) {
\n handler_evt[handler_cnt] = type;
\n handlers[handler_cnt] = fn;
\n handler_cnt++;
\n }
\n}<\/p>\n

void event_dispatch(event_t *evt)
\n{
\n for (uint8_t i = 0; i < handler_cnt; i++) {
\n if (handler_evt[i] == evt->type) {
\n handlers[i](evt);
\n }
\n }
\n}<\/p>\n

\u6ce8\u518c\u5728\u521d\u59cb\u5316\u65f6\u505a\u4e00\u6b21\u3002\u6309\u952e\u6a21\u5757\u6ce8\u518c EVT_KEY，\u663e\u793a\u6a21\u5757\u6ce8\u518c EVT_LCD_REFRESH\u3002\u6a21\u5757\u4e4b\u95f4\u4e0d\u76f4\u63a5\u8c03，\u9760\u4e8b\u4ef6\u89e3\u8026\u3002\u6539\u6309\u952e\u4e0d\u4f1a\u78b0\u663e\u793a，\u56e0\u4e3a\u663e\u793a\u6839\u672c\u4e0d\u77e5\u9053\u6309\u952e\u5b58\u5728，\u5b83\u53ea\u8ba4 EVT_LCD_REFRESH \u8fd9\u4e2a\u4e8b\u4ef6\u3002<\/p>\n

\u8fd9\u5c31\u662f\u7b56\u7565\u6a21\u5f0f\u7684 C \u8bed\u8a00\u7248：\u5206\u53d1\u903b\u8f91\u548c\u5177\u4f53\u5904\u7406\u903b\u8f91\u5206\u5f00，\u52a0\u65b0\u529f\u80fd\u4e0d\u7528\u52a8\u5206\u53d1\u5668，\u6ce8\u518c\u4e2a\u65b0 handler \u5c31\u884c\u3002<\/p>\n

\u4e3b\u5faa\u73af：\u4e09\u884c\u4ee3\u7801\u52a0\u4e00\u4e2a\u7761\u7720<\/h3>\n

\u4e09\u5757\u79ef\u6728\u62fc\u8d77\u6765，\u4e3b\u5faa\u73af\u5e72\u51c0\u5f97\u4e0d\u50cf\u8bdd\u3002<\/p>\n

int main(void)
\n{
\n system_init(); \/* \u5404\u6a21\u5757\u521d\u59cb\u5316 + \u6ce8\u518c\u4e8b\u4ef6\u5904\u7406\u5668 *\/
\n while (1) {
\n event_t evt;
\n if (event_get(&evt)) {
\n event_dispatch(&evt); \/* \u6709\u4e8b\u4ef6\u5c31\u5904\u7406 *\/
\n } else {
\n __WFI(); \/* \u6ca1\u4e8b\u4ef6\u5c31\u7761，\u7b49\u4e2d\u65ad\u5524\u9192 *\/
\n }
\n }
\n}<\/p>\n

\u5bf9\u6bd4\u90a3\u4e2a\u5361\u6b7b\u7684 Bug，\u73b0\u5728\u6309\u952e ISR \u91cc\u53ea\u505a\u4e00\u4ef6\u4e8b：\u8bfb\u952e\u503c\u3001\u6295\u9012 EVT_KEY \u4e8b\u4ef6\u3001\u6e05\u6807\u5fd7，\u7acb\u523b\u8fd4\u56de\u3002LCD \u5237\u65b0\u53d8\u6210\u4e86 EVT_LCD_REFRESH \u4e8b\u4ef6，\u7531\u4e3b\u5faa\u73af\u5728\u5b89\u5168\u4e0a\u4e0b\u6587\u91cc\u6162\u6162\u8c03 SPI DMA\u3002\u6b7b\u9501\u7684\u6839（\u4e2d\u65ad\u91cc\u7b49 DMA）\u88ab\u5f7b\u5e95\u62d4\u6389\u4e86\u3002<\/p>\n

__WFI \u662f\u987a\u5e26\u7684\u5927\u793c\u5305\u3002\u6ca1\u4e8b\u4ef6\u65f6 CPU \u8fdb\u4f4e\u529f\u8017，\u7b49\u4efb\u610f\u4e2d\u65ad\u5524\u9192\u3002\u529f\u8017\u4ece\u51e0\u5341 mA \u6389\u5230\u51e0 \u03bcA，\u5bf9\u4e00\u8282\u7535\u6c60\u8dd1\u534a\u5e74\u7684\u8bbe\u5907，\u8fd9\u662f\u80fd\u4e0d\u80fd\u51fa\u8d27\u7684\u5dee\u522b\u3002<\/p>\n

\"\u6539\u9020\u524d\u540e\u5bf9\u6bd4\uff1a\u5de6\u6309\u952eISR\u76f4\u63a5\u8c03LCD\u5237\u65b0\u6b7b\u9501\uff0c\u53f3ISR\u53ea\u6295\u9012+\u4e3b\u5faa\u73af\u5237\u65b0\u89e3\u8026\"<\/p>\n

ISR \u6539\u9020\u540e\u7684\u6837\u5b50<\/h3>\n

\u56de\u5230\u5f00\u5934\u90a3\u4e2a Bug，\u6539\u9020\u540e\u7684\u6309\u952e ISR \u957f\u8fd9\u6837：<\/p>\n

void EXTI15_10_IRQHandler(void)
\n{
\n uint16_t key = read_key_gpio(); \/* \u2460 \u8bfb\u786c\u4ef6\u5bc4\u5b58\u5668 *\/
\n event_post(EVT_KEY, key); \/* \u2461 \u6295\u9012\u4e8b\u4ef6 *\/
\n clear_exti_flag(); \/* \u2462 \u6e05\u4e2d\u65ad\u6807\u5fd7 *\/
\n}<\/p>\n

\u4e09\u4ef6\u4e8b，\u51e0\u6761\u6307\u4ee4，\u5fae\u79d2\u7ea7\u8fd4\u56de\u3002LCD \u5237\u65b0\u4ea4\u7ed9\u4e3b\u5faa\u73af\u91cc\u6ce8\u518c\u7684 key_handler \u53bb\u89e6\u53d1 EVT_LCD_REFRESH，\u518d\u7531 display_handler \u6162\u6162\u5237\u3002\u4e2d\u65ad\u4e0d\u518d\u7b49\u4efb\u4f55\u4e1c\u897f，DMA \u5b8c\u6210\u4e2d\u65ad\u968f\u65f6\u80fd\u8fdb\u6765，\u6b7b\u9501\u4e0d\u590d\u5b58\u5728\u3002<\/p>\n

\u8bb0\u4f4f\u8fd9\u6761\u94c1\u5f8b：ISR \u53ea\u6295\u9012，\u4e0d\u5e72\u6d3b\u3002 \u5b88\u4f4f\u5b83，\u80fd\u7701\u6389\u4e00\u534a\u7684"\u7384\u5b66 Bug"\u3002<\/p>\n

\u518d\u8fdb\u4e00\u6b65：\u5e26\u4f18\u5148\u7ea7\u7684\u4e8b\u4ef6<\/h3>\n

\u57fa\u7840\u7248\u662f\u5355\u961f\u5217 FIFO，\u5148\u5230\u5148\u5904\u7406\u3002\u4f46\u6709\u4e9b\u4e8b\u4ef6\u6025，\u6709\u4e9b\u4e8b\u4ef6\u7f13\u3002\u6025\u4e8b\u4ef6\u88ab\u4e00\u5806\u7f13\u4e8b\u4ef6\u5835\u5728\u961f\u5217\u540e\u9762，\u54cd\u5e94\u5c31\u6162\u4e86\u3002<\/p>\n

\u89e3\u6cd5\u662f\u5f00\u591a\u4e2a\u961f\u5217，\u6309\u4f18\u5148\u7ea7\u5206\u3002\u6bd4\u5982\u9ad8\u3001\u4e2d\u3001\u4f4e\u4e09\u4e2a\u961f\u5217，\u4e3b\u5faa\u73af\u6bcf\u6b21\u5148\u770b\u9ad8\u4f18\u5148\u7ea7\u961f\u5217，\u7a7a\u4e86\u518d\u770b\u4e2d，\u518d\u4f4e\u3002<\/p>\n

static event_t hi_queue[16], mid_queue[32], lo_queue[16];<\/p>\n

int event_get(event_t *out)
\n{
\n if (q_get(hi_queue, 16, &hi_head, &hi_tail, out)) return 1;
\n if (q_get(mid_queue, 32, &mid_head, &mid_tail, out)) return 1;
\n if (q_get(lo_queue, 16, &lo_head, &lo_tail, out)) return 1;
\n return 0;
\n}<\/p>\n

\u7b80\u5355\u6709\u6548，\u522b\u4e00\u4e0a\u6765\u5c31\u641e\u590d\u6742\u7684\u4f18\u5148\u7ea7\u8c03\u5ea6\u7b97\u6cd5\u3002\u5d4c\u5165\u5f0f\u573a\u666f\u91cc\u4e24\u4e09\u4e2a\u961f\u5217\u5206\u7ea7\u8db3\u591f\u8986\u76d6\u7edd\u5927\u591a\u6570\u9700\u6c42\u3002\u6ce8\u610f\u522b\u6ee5\u7528\u9ad8\u4f18\u5148\u7ea7，\u90fd\u6025\u7b49\u4e8e\u90fd\u4e0d\u6025，\u6700\u540e\u8fd8\u662f\u9000\u5316\u6210 FIFO\u3002<\/p>\n

\u5ef6\u8fdf\u4e8b\u4ef6：\u8ba9\u4e8b\u4ef6"\u7b49\u4e00\u4f1a"\u518d\u5904\u7406<\/h3>\n

\u6709\u65f6\u5019\u4f60\u60f3\u8ba9\u4e00\u4e2a\u4e8b\u4ef6\u8fc7 50ms \u518d\u5904\u7406，\u6bd4\u5982\u6309\u952e\u53bb\u6296\u3002\u4e2d\u65ad\u91cc\u4e0d\u80fd delay，\u4e3b\u5faa\u73af\u91cc\u786c delay \u53c8\u4f1a\u963b\u585e\u522b\u7684\u4e8b\u4ef6\u3002<\/p>\n

\u89e3\u6cd5\u662f\u7ed9\u4e8b\u4ef6\u52a0\u4e2a"\u5230\u671f\u65f6\u95f4"，\u653e\u8fdb\u4e00\u4e2a\u5ef6\u8fdf\u961f\u5217，\u4e3b\u5faa\u73af\u6bcf\u6b21\u8f6e\u8be2\u65f6\u68c0\u67e5\u5230\u6ca1\u5230\u671f，\u5230\u671f\u4e86\u518d\u642c\u5230\u4e3b\u961f\u5217\u3002<\/p>\n

typedef struct {
\n event_t evt;
\n uint32_t fire_tick; \/* \u5230\u671f\u7684\u7cfb\u7edf tick *\/
\n} delayed_event_t;<\/p>\n

static delayed_event_t delayed[8];<\/p>\n

void event_post_delayed(uint16_t type, uint16_t param, uint32_t ms)
\n{
\n \/* \u627e\u4e2a\u7a7a\u69fd\u5b58\u8d77\u6765，\u8bb0\u5f55\u5230\u671f\u65f6\u95f4 *\/
\n for (uint8_t i = 0; i < 8; i++) {
\n if (delayed[i].evt.type == EVT_NONE) {
\n delayed[i].evt.type = type;
\n delayed[i].evt.param = param;
\n delayed[i].fire_tick = sys_tick() + ms_to_tick(ms);
\n return;
\n }
\n }
\n}<\/p>\n

\/* \u4e3b\u5faa\u73af\u91cc\u8c03，\u628a\u5230\u671f\u7684\u4e8b\u4ef6\u642c\u5230\u4e3b\u961f\u5217 *\/
\nvoid event_tick(void)
\n{
\n uint32_t now = sys_tick();
\n for (uint8_t i = 0; i < 8; i++) {
\n if (delayed[i].evt.type != EVT_NONE &&
\n (int32_t)(now – delayed[i].fire_tick) >= 0) {
\n event_post(delayed[i].evt.type, delayed[i].evt.param);
\n delayed[i].evt.type = EVT_NONE;
\n }
\n }
\n}<\/p>\n

\u5224\u65ad\u5230\u671f\u7528 (int32_t)(now – fire_tick) >= 0，\u8fd9\u662f\u5904\u7406 tick \u56de\u7ed5\u7684\u6807\u51c6\u5199\u6cd5，\u522b\u76f4\u63a5\u6bd4\u5927\u5c0f，\u8dd1\u4e2a\u51e0\u5341\u5929 tick \u6ea2\u51fa\u5c31\u51fa Bug\u3002<\/p>\n

\u4e8b\u4ef6\u5408\u5e76：\u9ad8\u9891\u4e8b\u4ef6\u522b\u5237\u5c4f<\/h3>\n

\u4f20\u611f\u5668\u9ad8\u9891\u5c31\u7eea\u4e8b\u4ef6，\u4e00\u79d2\u949f\u89e6\u53d1\u51e0\u767e\u6b21，\u6bcf\u6b21\u90fd\u5237\u65b0 LCD \u6beb\u65e0\u610f\u4e49，\u4eba\u773c\u6839\u672c\u770b\u4e0d\u51fa\u533a\u522b，\u8fd8\u767d\u767d\u8017 CPU \u548c\u5237\u5c4f\u7535\u6d41\u3002<\/p>\n

\u89e3\u6cd5\u662f\u5408\u5e76\u3002\u540c\u4e00\u7c7b\u578b\u7684\u4e8b\u4ef6\u5728\u961f\u5217\u91cc\u53ea\u4fdd\u7559\u6700\u65b0\u7684，\u65e7\u7684\u4e22\u5f03\u3002\u6216\u8005\u66f4\u7b80\u5355：\u8bbe\u4e2a"\u810f\u6807\u5fd7"，\u4e8b\u4ef6\u6765\u4e86\u53ea\u7f6e\u6807\u5fd7\u4e0d\u7acb\u523b\u5904\u7406，\u4e3b\u5faa\u73af\u6309\u56fa\u5b9a\u8282\u62cd（\u6bd4\u5982 30Hz）\u68c0\u67e5\u6807\u5fd7，\u6709\u624d\u5237\u4e00\u6b21\u3002<\/p>\n

\/* \u9ad8\u9891\u4f20\u611f\u5668\u4e8b\u4ef6\u53ea\u66f4\u65b0\u6570\u636e，\u4e0d\u89e6\u53d1\u5237\u65b0 *\/
\nvoid sensor_handler(event_t *evt)
\n{
\n sensor_data = read_sensor(evt->param);
\n lcd_dirty = 1; \/* \u53ea\u7f6e\u6807\u5fd7 *\/
\n}<\/p>\n

\/* \u4e3b\u5faa\u73af\u6309\u8282\u62cd\u68c0\u67e5，30Hz \u5237\u4e00\u6b21 *\/
\nvoid lcd_tick_handler(event_t *evt) \/* EVT_TIMER_TICK *\/
\n{
\n if (lcd_dirty) {
\n lcd_refresh();
\n lcd_dirty = 0;
\n }
\n}<\/p>\n

\u8fd9\u6837\u65e0\u8bba\u4f20\u611f\u5668\u4e8b\u4ef6\u591a\u9891\u7e41，LCD \u5237\u65b0\u59cb\u7ec8\u662f 30Hz，\u65e2\u4e0d\u4e22\u6570\u636e\u4e5f\u4e0d\u6d6a\u8d39\u3002\u8fd9\u662f\u5d4c\u5165\u5f0f GUI \u6027\u80fd\u4f18\u5316\u7684\u5e38\u7528\u62db\u6570\u3002<\/p>\n

\"\u4e8b\u4ef6\u6539\u8fdb\u4e09\u65b9\u5411\uff1a\u5e26\u4f18\u5148\u7ea7\u591a\u961f\u5217\/\u5ef6\u8fdf\u4e8b\u4ef6\u5230\u671f\u961f\u5217\/\u4e8b\u4ef6\u5408\u5e76\u810f\u6807\u5fd7\"<\/p>\n

\u4ec0\u4e48\u65f6\u5019\u8fd9\u5957\u673a\u5236\u591f\u7528，\u4ec0\u4e48\u65f6\u5019\u8be5\u4e0a RTOS<\/h3>\n

\u8bf4\u4e86\u8fd9\u4e48\u591a\u8fd9\u5957\u5f02\u6b65\u4e8b\u4ef6\u7cfb\u7edf\u7684\u597d\u5904，\u4e5f\u5f97\u8bf4\u5b83\u7684\u8fb9\u754c\u3002\u5b83\u672c\u8d28\u662f"\u534f\u4f5c\u5f0f"\u8c03\u5ea6：\u4e00\u4e2a handler \u6267\u884c\u65f6，\u522b\u7684 handler \u548c\u4e3b\u5faa\u73af\u90fd\u5f97\u7b49\u3002\u5982\u679c\u4f60\u7684\u67d0\u4e2a\u5904\u7406\u771f\u7684\u9700\u8981\u957f\u65f6\u95f4\u963b\u585e（\u6bd4\u5982\u7b49\u7f51\u7edc\u54cd\u5e94），handler \u91cc\u4e00\u963b\u585e，\u6574\u4e2a\u7cfb\u7edf\u5c31\u5361\u4f4f\u3002<\/p>\n

\u8fd9\u79cd\u573a\u666f\u5c31\u8be5\u4e0a RTOS \u4e86\u3002RTOS \u7ed9\u6bcf\u4e2a\u4efb\u52a1\u72ec\u7acb\u6808\u548c\u62a2\u5360\u5f0f\u8c03\u5ea6，\u4e00\u4e2a\u4efb\u52a1\u963b\u585e\u4e0d\u5f71\u54cd\u522b\u7684\u3002\u4ee3\u4ef7\u662f\u5f15\u5165 RTOS \u7684\u590d\u6742\u5ea6\u3001RAM \u5f00\u9500\u3001\u5b66\u4e60\u6210\u672c\u3002<\/p>\n

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