{"id":50,"date":"2020-08-08T17:32:22","date_gmt":"2020-08-08T09:32:22","guid":{"rendered":"http:\/\/dt9025a.xyz\/?p=50"},"modified":"2020-12-19T00:18:08","modified_gmt":"2020-12-18T16:18:08","slug":"%e5%b0%8f%e8%ae%b0ws2812%e9%a9%b1%e5%8a%a8","status":"publish","type":"post","link":"https:\/\/dt9025a.top\/?p=50","title":{"rendered":"\u5c0f\u8bb0WS2812\u9a71\u52a8"},"content":{"rendered":"\r\n
\u73af\u5883\uff1aKeil Uv4 C51   STC8G1K08@12MHz   Optimize Level = 8<\/pre>\r\n\r\n\r\n\r\n\u9a71\u52a8\u6548\u679c<\/figcaption><\/figure>\r\n\r\n\r\n\r\n\u5173\u4e8eWS2812<\/h3>\r\n\r\n\r\n\r\n\u53c2\u8003Datasheet\uff1a\u94fe\u63a5<\/a><\/p>\r\n\r\n\r\n\r\n
\u7b80\u8ff0<\/h4>\r\n\r\n\r\n\r\nWS2812\u662f\u4e00\u4e2a\u96c6\u63a7\u5236\u7535\u8def\u4e0e\u53d1\u5149\u7535\u8def\u4e8e\u4e00\u4f53\u7684\u667a\u80fd\u5916\u63a7 LED \u5149\u6e90\uff0c\u901a\u8fc7\u5355\u603b\u7ebf\u534f\u8bae\u4f20\u8f93\u6570\u636e\uff0c\u652f\u6301\u65e0\u9650\u7ea7\u8054\uff0c\u652f\u6301256\u7ea7\u4eae\u5ea6\u548c16777216\u8272\u663e\u793a\u3002<\/p>\r\n\r\n\r\n\r\n
\u5f15\u811a\u5206\u914d<\/h4>\r\n\r\n\r\n\r\n2812\u76845050\u5c01\u88c5\u5177\u6709\u56db\u4e2a\u5f15\u811a\uff0c\u5305\u62ecVSS\/VDD\/DIN\/DOUT\u3002\u5176\u4e2dVSS\u548cVDD\u4e3a\u7535\u6e90\u5f15\u811a\uff0c\u4f9b\u7535\u7535\u538b3.5~5.3V\uff1bDIN\u4e3a\u6570\u636e\u8f93\u5165\u5f15\u811a\uff0cDOUT\u4e3a\u7ea7\u8054\u6570\u636e\u8f93\u51fa\u5f15\u811a\u3002<\/p>\r\n\r\n\r\n\r\n
\u65e0\u9650\u7ea7\u8054\u539f\u7406 <\/h4>\r\n\r\n\r\n\r\n\u5f532812\u901a\u8fc7 DIN -> DOUT -> DIN -> DOUT … \u8fd9\u79cd\u65b9\u5f0f\u8fde\u63a5\u8d77\u6765\u65f6\uff0c\u7b2c\u4e00\u7ec424bits\u6570\u636e\u4f20\u8f93\u5b8c\u6210\u524d\uff0c\u7b2c\u4e00\u4e2a2812\u7684DOUT\u5f15\u811a\u4e0d\u4f1a\u6709\u4efb\u4f55\u8f93\u51fa\uff0c24bits\u4f20\u8f93\u5b8c\u6210\u540e\uff0c\u7b2c\u4e00\u4e2a2812\u4e0d\u518d\u8fdb\u884c\u6570\u636e\u63a5\u6536\uff0c\u800c\u5c06\u6570\u636e\u901a\u8fc7DOUT\u811a\u8f93\u51fa\u81f3\u4e0b\u4e00\u4e2a2812\u7684DIN\u3002\u901a\u8fc7\u8fd9\u79cd\u5faa\u73af\uff0c\u4fbf\u53ef\u4ee5\u5b9e\u73b02812\u7684\u65e0\u9650\u7ea7\u8fde\u3002<\/p>\r\n\r\n\r\n\r\n
\u5728Datasheet\u4e2d\u6709\u66f4\u52a0\u8be6\u7ec6\u7684\u89e3\u91ca\u548c\u914d\u56fe\uff0c\u8bfb\u8005\u53ef\u81ea\u884c\u67e5\u9605\u3002<\/p>\r\n\r\n\r\n\r\n
\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5f53RESET CODE\u4f20\u8f93\u524d\uff0c2812\u4f1a\u56e0\u8ba4\u4e3a\u6570\u636e\u6ca1\u6709\u4f20\u8f93\u5b8c\u6210\u800c\u4e0d\u70b9\u4eae\u3002<\/strong><\/p>\r\n\r\n\r\n\r\n
\u9a71\u52a8\u76f8\u5173<\/h3>\r\n\r\n\r\n\r\n\u6ce8\u610f\uff1a\u7531\u4e8e\u5355\u603b\u7ebf\u534f\u8bae\u5927\u591a\u5bf9\u65f6\u5e8f\u8981\u6c42\u4e25\u683c\uff0c\u6240\u4ee5\u9700\u8981\u7528\u6c47\u7f16\u8fdb\u884c\u4e66\u5199\u6216\u4e25\u683c\u5bf9\u7167\u7f16\u8bd1\u5668\u6240\u7f16\u8bd1\u7684\u5b57\u8282\u7801\u8fdb\u884c\u8ba1\u7b97\u3002\u540c\u65f6\u4e0d\u540c\u578b\u53f7\u7684STC\u5355\u7247\u673a\u6307\u4ee4\u96c6\u53ef\u80fd\u4e0d\u540c\uff0c\u5176\u6307\u4ee4\u7684\u6267\u884c\u5468\u671f\u4e5f\u6709\u4e00\u5b9a\u5dee\u522b\uff0c\u9700\u8981\u5bf9\u7167\u6307\u4ee4\u96c6\u8fdb\u884c\u8ba1\u7b97\uff0c\u672c\u6587\u4f9d\u636e\u7684\u6307\u4ee4\u96c6\u4e3aSTC-Y6\u3002<\/strong><\/p>\r\n\r\n\r\n\r\n
\u901a\u8fc7\u5bf9Datasheet\u7684\u67e5\u9605\uff0c\u6211\u4eec\u5f97\u51fa\uff1aWS2812\u7684\u663e\u793a\u9700\u8981\u4e09\u4e2a\u5b57\u8282\u6765\u8868\u793a\u989c\u8272\uff0c\u53d1\u9001\u987a\u5e8f\u4e3aG-R-B\uff0c\u9ad8\u4f4d\u5148\u884c\u3002\u7531\u6b64\u53ef\u4ee5\u5199\u51fa\u4ee5\u4e0b\u539f\u578b\u4ee3\u7801\uff1a<\/p>\r\n\r\n\r\n\r\n
\/\/sbit WS2812_IO = P3 ^ 3;\r\nvoid WS2812_SendByte(unsigned char dat) {\r\n\tunsigned char i = 8;\r\n\r\n\tdat <<= 1;\r\n\twhile(i) {\r\n\t\tWS2812_IO = 1;\r\n\t\tdelay_ns(...);\r\n\t\tWS2812_IO = CY;\r\n\t\tdelay_ns(...);\r\n\t\tWS2812_IO = 0;\r\n\t\tdat <<= 1;\r\n\t\ti--;\r\n\t}\r\n}<\/pre>\r\n\r\n\r\n\r\n\u5c06\u539f\u578b\u4e2d\u7684delay\u6ce8\u91ca\u540e\u5728Keil\u4e2d\u8fdb\u884c\u7f16\u8bd1\u540e\u8fd0\u884cdebug\uff0c\u5728\u53cd\u6c47\u7f16\u7a97\u53e3\u4e2d\u53ef\u5f97\u5230\u5982\u4e0b\u4ee3\u7801\uff1a<\/p>\r\n\r\n\r\n\r\n
\u53cd\u6c47\u7f16\u7ed3\u679c<\/figcaption><\/figure><\/div>\r\n\r\n\r\n\r\nTips\uff1aCY\u4e3a8051\u4e2d\u7684\u8fdb\u4f4d\u6807\u5fd7\uff0c\u5f53\u6700\u540e\u4e00\u6b21\u7b97\u672f\u64cd\u4f5c\u4ea7\u751f\u8fdb\u4f4d\uff08\u52a0\u6cd5\uff09\u6216\u501f\u4f4d\uff08\u51cf\u6cd5\uff09\u65f6\uff0c\u8be5\u4f4d\u7f6e 1\u3002\u5728\u6b64\u5904\u7528\u4f5c\u53d6\u6700\u9ad8\u4f4d\u3002<\/p>\r\n\r\n\r\n\r\n
\u8be5\u51fd\u6570\u5b8c\u6574\u7684\u53cd\u6c47\u7f16\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\r\n\r\n\r\n\r\n
;    41: void WS2812_SendByte(unsigned char dat) { \r\n;    42:         unsigned char i = 8; \r\n;    43:  \r\n;C:0x0093    7E08\r\nMOV      R6,#0x08\r\n\r\n;    44:         dat <<= 1; \r\n;C:0x0095    EF\r\nMOV      A,R7\r\n;C:0x0096    25E0\r\nADD      A,ACC(0xE0)\r\n;C:0x0098    FF\r\nMOV      R7,A\r\n\r\n;    45:         while(i) { \r\n;    46:                 WS2812_IO = 1; \r\n;    47:                 \/\/delay_ns(...); \r\n;C:0x0099    D2B3\r\nSETB     WS2812_IO(0xB0.3)\r\n\r\n;    48:                 WS2812_IO = CY; \r\n;    49:                 \/\/delay_ns(...); \r\n;C:0x009B    92B3\r\nMOV      WS2812_IO(0xB0.3),C\r\n\r\n;    50:                 WS2812_IO = 0; \r\n;C:0x009D    C2B3\r\nCLR      WS2812_IO(0xB0.3)\r\n\r\n;    51:                 dat <<= 1; \r\n;C:0x009F    EF\r\nMOV      A,R7\r\n;C:0x00A0    25E0\r\nADD      A,ACC(0xE0)\r\n;C:0x00A2    FF\r\nMOV      R7,A\r\n\r\n;    52:                 i--; \r\n;C:0x00A3    DEF4\r\nDJNZ     R6,C:0099\r\n\r\n;    53:         } \r\n;    54: } <\/pre>\r\n\r\n\r\n\r\n\u901a\u8fc7\u67e5\u9605 STC8 \u7684\u6570\u636e\u624b\u518c\u6211\u4eec\u53ef\u4ee5\u4e86\u89e3\u5230\uff0cSETB bit<\/code>\u3001MOV bit,C<\/code>\u3001CLR bit<\/code>\u3001MOV A,Rn<\/code>\u3001ADD A,#data<\/code>\u3001MOV Rn,A<\/code>\u7684\u6307\u4ee4\u5468\u671f\u5747\u4e3a1\u673a\u5668\u5468\u671f\uff0c\u800cDJNZ Rn,rel<\/code>\u5728\u6761\u4ef6\u6ee1\u8db3\u65f6\u9700\u8981\u4e09\u4e2a\u673a\u5668\u5468\u671f \uff0c\u4e0d\u6ee1\u8db3\u65f6\u9700\u8981\u4e24\u4e2a\u673a\u5668\u5468\u671f \u30022 \/ 3\u53ef\u4e0d\u662f2 \/ 3\u5468\u671f\uff01<\/s><\/strong>ao\u591a\u5355\u5468\u671f\u6307\u4ee4\uff0c\u6211\u4eecstc\u771f\u7684\u592a\u5389\u5bb3\u5566\uff01<\/s><\/p>\r\n\r\n\r\n\r\n
\u800c\u5728 12MHz \u7684\u6676\u632f\u4e0b\uff0c\u4e00\u4e2a\u65f6\u949f\u5468\u671f\u7684\u65f6\u95f4\u4e3a 1\/12 us \uff0c\u5373\u4e3a 0.083us\uff0c83.3ns\u3002STC8 \u4e3a 1T \u673a\uff0c1\u65f6\u949f\u5468\u671f = 1\u673a\u5668\u5468\u671f\u3002\u8fd9\u6837\u53ef\u4ee5\u6362\u7b97\u51fa\u6bcf\u6761\u6307\u4ee4\u6240\u9700\u8981\u7684\u65f6\u95f4\u3002<\/p>\r\n\r\n\r\n\r\n
\u5bf9\u6307\u4ee4\u65f6\u95f4\u8fdb\u884c\u8ba1\u7b97\uff0c\u53ef\u4ee5\u6362\u7b97\u51fa\u6bcf\u4e2a delay()<\/code> \u7b49\u6548\u4e8e\u591a\u5c11\u7684 _nop_()<\/code>\u3002<\/p>\r\n\r\n\r\n\r\n
\u7ecf\u8fc7\u591a\u6b21\u5b9e\u9a8c\uff0c\u5f53 [katex]TxH+TxL=1.417\\mu s[\/katex]\uff1b\u4e141\u7801\u4e0e0\u7801\u9ad8\u4f4e\u7535\u5e73\u65f6\u957f\u5206\u522b\u5982\u4e0b\u8868\u65f6\uff0c\u53ef\u4ee5\u6b63\u5e38\u9a71\u52a8\u624b\u5934\u76842812\u8fdb\u884c\u663e\u793a\uff0c\u5b9e\u9a8c\u7ec6\u8282\u5728\u4e0b\u6587\u4e0d\u8868\uff0c\u4ec5\u57fa\u4e8e\u5b9e\u9a8c\u7ed3\u679c\u5206\u6790\u8fc7\u7a0b\u3002<\/p>\r\n\r\n\r\n\r\n
(us)<\/td> H<\/td> L<\/td><\/tr>
T \u20180\u2019<\/td> 0.4167<\/td> 1.0003<\/td><\/tr>
T \u20181\u2019<\/td> 0.8333<\/td> 0.5837<\/td><\/tr><\/tbody><\/table><\/figure>\r\n\r\n\r\n\r\n\u5c06\u4e0a\u6587\u53cd\u6c47\u7f16\u4e2d\u7684while\u5185\u4ee3\u7801\u63d0\u53d6\u51fa\u6765\uff0c\u6211\u4eec\u53ef\u4ee5\u5217\u51fa\u5982\u4e0b\u8868\u683c\uff1a<\/p>\r\n\r\n\r\n\r\n
\u6307\u4ee4<\/td> \u673a\u5668\u5468\u671f<\/td> \u6240\u9700\u65f6\u95f4<\/td><\/tr>
SETB     WS2812_IO(0xB0.3)<\/td> 1<\/td> 83.3ns <\/td><\/tr>
NOP^{1<\/sup><\/td>} 1<\/td> x<\/td><\/tr>
MOV     WS2812_IO(0xB0.3),C<\/td> 1<\/td> 83.3ns <\/td><\/tr>
NOP^{2<\/sup><\/td>} 1<\/td> x<\/td><\/tr>
CLR       WS2812_IO(0xB0.3)<\/td> 1<\/td> 83.3ns <\/td><\/tr>
MOV      A,R7<\/td> 1<\/td> 83.3ns <\/td><\/tr>
ADD      A,ACC(0xE0)<\/td> 1<\/td> 83.3ns <\/td><\/tr>
MOV      R7,A<\/td> 1<\/td> 83.3ns <\/td><\/tr>
DJNZ     R6,C:0099<\/td> 2 \/ 3<\/td> 249.9ns <\/td><\/tr><\/tbody><\/table><\/figure>\r\n\r\n\r\n\r\n\u9996\u5148\u5206\u67900\u7801\uff1a0\u7801\u7684\u9ad8\u7535\u5e73\u65f6\u95f4\u6700\u77ed\uff0c\u4e3a0.416us\u3002\u5728MOV WS2812_IO(0xB0.3),C<\/code>\u6267\u884c\u540e\uff0c\u6570\u636e\u7ebf\u5c06\u88ab\u8be5\u8bed\u53e5\u62c9\u4f4e\u3002\u53ef\u4ee5\u5f97\u51fa\u7b97\u5f0f[katex](1+x)\\times 0.083=0.416[\/katex]\uff0c\u89e3\u65b9\u7a0b\u53ef\u4ee5\u5f97\u5230[katex]x=4[\/katex]\uff0c\u6240\u4ee5NOP^{1<\/sup>\u7684\u6570\u91cf\u4e3a4\u3002<\/p>\r\n\r\n\r\n\r\n}
1\u7801\u7684\u9ad8\u7535\u5e73\u65f6\u95f4\u4e3a0.833us\u3002\u5728 CLR WS2812_IO(0xB0.3)<\/code> \u6267\u884c\u540e\uff0c\u6570\u636e\u7ebf\u5c06\u88ab\u8be5\u8bed\u53e5\u62c9\u4f4e\u3002\u53ef\u4ee5\u5f97\u51fa\u7b97\u5f0f[katex](6+x)\\times 0.083=0.833[\/katex]\uff0c\u89e3\u65b9\u7a0b\u53ef\u4ee5\u5f97\u5230[katex]x=4[\/katex]\uff0c\u6240\u4ee5NOP^{2<\/sup>\u7684\u6570\u91cf\u4e5f\u4e3a4\u3002 <\/p>\r\n\r\n\r\n\r\n}
\u7531\u4e0a\u9762\u7684\u6b65\u9aa4\uff0c\u6211\u4eec\u53ef\u4ee5\u5f97\u51fa\u4e0b\u8868\u3002<\/p>\r\n\r\n\r\n\r\n
\u6307\u4ee4<\/td> \u673a\u5668\u5468\u671f<\/td> \u6240\u9700\u65f6\u95f4<\/td><\/tr>
SETB     WS2812_IO(0xB0.3)<\/td> 1<\/td> 83.3ns <\/td><\/tr>
NOP^{1<\/sup><\/td>} 1 * 4 = 4<\/td> 333.2ns<\/td><\/tr>
MOV     WS2812_IO(0xB0.3),C<\/td> 1<\/td> 83.3ns <\/td><\/tr>
NOP^{2<\/sup><\/td>} 1 * 4 = 4<\/td> 333.2ns<\/td><\/tr>
CLR       WS2812_IO(0xB0.3)<\/td> 1<\/td> 83.3ns <\/td><\/tr>
MOV      A,R7<\/td> 1<\/td> 83.3ns <\/td><\/tr>
ADD      A,ACC(0xE0)<\/td> 1<\/td> 83.3ns <\/td><\/tr>
MOV      R7,A<\/td> 1<\/td> 83.3ns <\/td><\/tr>
DJNZ     R6,C:0099<\/td> 2 \/ 3<\/td> 249.9ns <\/td><\/tr><\/tbody><\/table><\/figure>\r\n\r\n\r\n\r\n\u81f3\u6b64\uff0c\u8be5\u7a0b\u5e8f\u5df2\u7ecf\u53ef\u4ee5\u6b63\u5e38\u4f7f\u7528\u4e86\uff0c\u4f46\u5b9e\u9645\u60c5\u51b5\u4e0b\u53ef\u80fd\u8fd8\u9700\u8981\u5206\u6790\u4e0b\u6765\u7684\u4f4e\u7535\u5e73\u65f6\u957f\uff0c\u5728\u6b64\u505a\u7b80\u7565\u53d9\u8ff0\u3002(\u603b\u65f6\u957f\u7531\u4ee5\u4e0b\u56e0\u7d20\u51b3\u5b9a)<\/p>\r\n\r\n\r\n\r\n
0\u7801\u65f6\uff0c\u5728MOV WS2812_IO(0xB0.3),C<\/code>\u6267\u884c\u540e\uff0c\u6570\u636e\u7ebf\u5c06\u88ab\u8be5\u8bed\u53e5\u62c9\u4f4e\u3002\u4e4b\u540e\u7684\u8bed\u53e5\u4e00\u5171\u9700\u898112\u4e2a\u673a\u5668\u5468\u671f\u6267\u884c\u540e\u624d\u4f1a\u5c06\u6570\u636e\u7ebf\u62c9\u9ad8\uff0c[katex]12\\times 0.083 = 0.9996\\mu s[\/katex] \uff1b[katex]0.9996+0.4167=1.4163\\approx 1.417\\mu s[\/katex]\u3002\u53ef\u80fd\u6709\u65f6\u9700\u8981\u5bf9\u8fd9\u91cc\u8fdb\u884c\u8c03\u6574\u30021\u7801\u4ee5\u6b64\u7c7b\u63a8\u3002<\/p>\r\n\r\n\r\n\r\n
\u4e0b\u56fe\u662f\u903b\u8f91\u5206\u6790\u4eea\u6293\u5230\u7684\u6570\u636e\u4f20\u8f93\u8fc7\u7a0b\u3002<\/p>\r\n\r\n\r\n\r\n
0x00<\/figcaption><\/figure>\r\n\r\n\r\n\r\n0xff<\/figcaption><\/figure>\r\n\r\n\r\n\r\n12\/18\uff1a\u95f2\u7740\u6ca1\u4e8b\u8bd5\u4e86\u4e00\u4e0b\uff0c\u57fa\u4e8eSTC8H8K64S4U\u5e73\u53f0\u7684nop\u6570\u91cf\uff0cY6\u5e94\u8be5\u53ef\u4ee5\u76f4\u63a5\u62ff\u8d70\u7528\u3002<\/p>\r\n\r\n\r\n\r\n
\u9891\u7387\u8303\u56f4\uff08MHz\uff09<\/td> nop\u4e2a\u6570<\/td><\/tr>
5.5296 – 6.8<\/td> 1<\/td><\/tr>
6.8 – 10.8<\/td> 2<\/td><\/tr>
10.8 – 21.4<\/td> 4<\/td><\/tr>
21.4 – 29.5<\/td> 6<\/td><\/tr>
29.5 – 35.1<\/td> 8<\/td><\/tr>
35.1 – 40.7<\/td> 10<\/td><\/tr>
40.7 – 46.8<\/td> 12<\/td><\/tr>
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\u73af\u5883\uff1aKeil Uv4 C51 STC8G1K08@12MHz Optimize Level = 8 \u9a71\u52a8\u6548\u679c… <\/p>\n
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