{"id":106827,"date":"2026-09-18T11:48:52","date_gmt":"2026-09-18T03:48:52","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/106827.html"},"modified":"2026-09-18T11:48:52","modified_gmt":"2026-09-18T03:48:52","slug":"%e7%b1%bb%e5%9e%8b%e8%bd%ac%e6%8d%a2%e7%b2%be%e5%ba%a6%e4%b8%a2%ef%bc%9aint-%e8%bd%ac-float-%e6%88%aa%e6%96%ad%ef%bc%8c%e5%85%88%e8%bd%ac%e5%ae%bd%e7%b1%bb%e5%9e%8b%e5%86%8d%e7%ae%97","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/106827.html","title":{"rendered":"\u7c7b\u578b\u8f6c\u6362\u7cbe\u5ea6\u4e22\uff1aint \u8f6c float \u622a\u65ad\uff0c\u5148\u8f6c\u5bbd\u7c7b\u578b\u518d\u7b97"},"content":{"rendered":"

\u7c7b\u578b\u8f6c\u6362\u7cbe\u5ea6\u4e22：int \u8f6c float \u622a\u65ad，\u5148\u8f6c\u5bbd\u7c7b\u578b\u518d\u7b97<\/h2>\n

\u6458\u8981：\u672c\u6587\u901a\u8fc7\u4e00\u4e2a ADC \u6807\u5ea6\u6362\u7b97\u7ffb\u8f66\u6848\u4f8b，\u8bb2\u89e3 C \u8bed\u8a00\u4e2d int\/int \u6574\u6570\u9664\u6cd5\u622a\u65ad\u5bfc\u81f4\u7684\u7cbe\u5ea6\u4e22\u5931\u95ee\u9898\u3002\u6838\u5fc3\u539f\u56e0：\u4e24\u4e2a\u6574\u6570\u76f8\u9664\u7ed3\u679c\u4ecd\u662f\u6574\u6570，\u5c0f\u6570\u5728\u6574\u6570\u9636\u6bb5\u5df2\u88ab\u4e22\u5f03，\u518d\u8d4b\u7ed9 float \u4e3a\u65f6\u5df2\u665a\u3002\u89e3\u6cd5\u662f\u5728\u8fd0\u7b97\u524d\u628a\u64cd\u4f5c\u6570\u8f6c\u6210\u6d6e\u70b9（(float)raw \/ 4095 \u6216\u4e58 1.0f），\u8ba9\u9664\u6cd5\u5728\u6d6e\u70b9\u57df\u8fdb\u884c\u3002\u6587\u4e2d\u9644\u9519\u8bef\u7248\u4e0e\u6b63\u786e\u7248\u4ee3\u7801\u3001\u65b9\u6848\u5bf9\u6bd4\u53ca -Wconversion \u914d\u7f6e\u5efa\u8bae，\u5e76\u5ef6\u4f38\u4ecb\u7ecd\u65e0 FPU MCU \u7684 Q \u683c\u5f0f\u5b9a\u70b9\u6570\u65b9\u6848\u3002<\/p>\n

\u4e00\u3001\u5f00\u7bc7：\u4e00\u4e2a\u771f\u5b9e\u7ffb\u8f66\u73b0\u573a<\/h3>\n

\u4e00\u6bb5\u505a\u6807\u5ea6\u6362\u7b97\u7684\u4ee3\u7801：int raw = 4095; float v = raw \/ 4095 * 3.3f;，\u672c\u610f\u628a ADC \u539f\u59cb\u503c\u6362\u7b97\u6210\u7535\u538b\u3002\u7ed3\u679c v \u7b97\u51fa\u6765\u662f 0.0 \u6216 3.3 \u8df3\u53d8，\u4e2d\u95f4\u503c\u5168\u4e22\u3002\u539f\u56e0：raw \/ 4095 \u662f\u4e24\u4e2a\u6574\u6570\u76f8\u9664，\u7ed3\u679c\u5148\u6309\u6574\u6570\u7b97（4095\/4095=1，\u4f46\u82e5\u662f 2000\/4095=0），\u518d\u8f6c float \u2192 \u7cbe\u5ea6\u5728\u6574\u6570\u9664\u6cd5\u90a3\u6b65\u5c31\u4e22\u4e86\u3002<\/p>\n

\u6839\u56e0\u4e00\u53e5\u8bdd：C \u4e2d"\u4e24\u4e2a\u540c\u7c7b\u578b\u64cd\u4f5c\u6570\u8fd0\u7b97，\u7ed3\u679c\u4e5f\u662f\u8be5\u7c7b\u578b"\u3002int \/ int \u505a\u6574\u6570\u9664\u6cd5（\u622a\u65ad\u5c0f\u6570），\u518d\u8d4b\u503c\u7ed9 float \u5df2\u7ecf\u665a\u4e86\u2014\u2014\u5c0f\u6570\u5df2\u5728\u6574\u6570\u9636\u6bb5\u4e22\u5931\u3002\u89e3\u6cd5：\u8fd0\u7b97\u524d\u628a\u81f3\u5c11\u4e00\u4e2a\u64cd\u4f5c\u6570\u8f6c\u6210\u6d6e\u70b9（(float)raw \/ 4095 \u6216\u4e58 1.0f），\u8ba9\u9664\u6cd5\u5728\u6d6e\u70b9\u57df\u8fdb\u884c，\u4fdd\u7559\u7cbe\u5ea6\u3002<\/p>\n

\u9002\u7528\u8bfb\u8005：\u505a int\/int \u518d\u8d4b\u7ed9 float\u3001\u53d1\u73b0\u5c0f\u6570\u90e8\u5206\u5168\u4e22\/\u7ed3\u679c\u8df3\u53d8\u7684\u540c\u5b66\u3002
\n\u8bfb\u5b8c\u4f60\u80fd\u505a：\u8bc6\u522b\u6574\u6570\u9664\u6cd5\u622a\u65ad\u5bfc\u81f4\u7684\u7cbe\u5ea6\u4e22\u5931，\u7528"\u5148\u8f6c\u6d6e\u70b9\u518d\u8fd0\u7b97"\u4fdd\u7559\u7cbe\u5ea6\u3002<\/p>\n

\u4e8c\u3001\u5148\u641e\u61c2：\u6574\u6570\u9664\u6cd5\u622a\u65ad（\u8ba4\u77e5）<\/h3>\n

2.1 \u540c\u7c7b\u578b\u8fd0\u7b97\u89c4\u5219<\/h4>\n

C \u7684"\u5bfb\u5e38\u7b97\u672f\u8f6c\u6362"：\u4e24\u4e2a\u6574\u6570\u64cd\u4f5c\u6570\u8fd0\u7b97，\u7ed3\u679c\u8fd8\u662f\u6574\u6570，\u9664\u6cd5\u5411\u96f6\u622a\u65ad（\u4e22\u5f03\u5c0f\u6570）\u30025\/2 = 2，2000\/4095 = 0\u3002\u53ea\u6709\u8fd0\u7b97\u7ed3\u679c\u8d4b\u7ed9 float \u624d\u4f1a\u8f6c，\u4f46\u8f6c\u6362\u53d1\u751f\u5728\u8fd0\u7b97\u4e4b\u540e，\u5c0f\u6570\u5df2\u6ca1\u4e86\u3002<\/p>\n

2.2 \u4e3a\u4ec0\u4e48\u7cbe\u5ea6\u4e22<\/h4>\n

raw \/ 4095：raw \u548c 4095 \u90fd\u662f int \u2192 \u6574\u6570\u9664\u6cd5，\u622a\u65ad\u3002\u5373\u4f7f\u5de6\u8fb9\u662f 2000，\u7ed3\u679c 0，\u518d *3.3f \u5f97 0.0f\u3002\u4e2d\u95f4\u503c\u7cbe\u5ea6\u5728\u6574\u6570\u9636\u6bb5\u5df2\u6ca1\u3002<\/p>\n\n\u5199\u6cd5\u7ed3\u679c<\/tr>\n\n\n\n
2000\/4095*3.3f<\/td>\n0.0（\u622a\u65ad）<\/td>\n<\/tr>\n
(float)2000\/4095*3.3f<\/td>\n1.612<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

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int\u9664\u6cd5<\/p>\n

<\/span><\/p>\n

\u8f6cfloat\u518d\u9664<\/p>\n

<\/span><\/p>\n

raw\/4095*3.3f<\/p>\n

<\/span><\/p>\n

\u9664\u6cd5\u57df?<\/p>\n

<\/span><\/p>\n

\u622a\u65ad \u7cbe\u5ea6\u4e22<\/p>\n

<\/span><\/p>\n

\u4fdd\u7559\u5c0f\u6570<\/p>\n

<\/span><\/p>\n

\u56fe 1：\u6574\u6570\u9664\u6cd5\u622a\u65ad（\u5982\u56fe 1 \u6240\u793a，\u5148\u8f6c\u6d6e\u70b9\u624d\u4fdd\u7cbe\u5ea6）\u3002<\/p>\n

[\u6ce8\u610f] \u53cd\u8fc7\u6765 float \u8f6c int \u4e5f\u4f1a\u4e22\u5c0f\u6570（\u5411\u96f6\u622a\u65ad），\u4e14\u5927 float \u8f6c int \u53ef\u80fd\u6ea2\u51fa\u672a\u5b9a\u4e49（float \u8303\u56f4\u8fdc\u5927\u4e8e int）\u3002\u6df7\u5408\u8fd0\u7b97\u8981\u6e05\u695a\u6bcf\u6b65\u7c7b\u578b\u3002<\/p>\n

\u4e09\u3001\u4e3a\u4ec0\u4e48\u4f1a\u4e22\u7cbe\u5ea6（\u539f\u7406 + \u771f\u5b9e\u9519\u8bef\u4ee3\u7801）<\/h3>\n

3.1 \u9519\u8bef\u7248<\/h4>\n

\/\/ \u274c \u9519：int\/int \u5148\u622a\u65ad\u518d\u8f6c float<\/span>
\nint<\/span> raw =<\/span> 2000<\/span>;<\/span>
\nfloat<\/span> v =<\/span> raw \/<\/span> 4095<\/span> *<\/span> 3.3f<\/span>;<\/span> \/\/ raw\/4095 \u662f\u6574\u6570\u9664\u6cd5 = 0 \u2192 v = 0.0<\/span>
\n\/\/ \u671f\u671b\u7ea6 1.612V，\u5b9e\u9645 0.0<\/span><\/p>\n

\u9519：\u2460raw(int) \/ 4095(int) \u2192 \u6574\u6570\u9664\u6cd5 =0；\u24610 * 3.3f = 0.0f；\u2462\u5c0f\u6570\u5728\u6574\u6570\u9636\u6bb5\u4e22\u5931\u3002<\/p>\n

[\u5751] \u94c1\u5f8b：\u542b\u9664\u6cd5\u7684\u6807\u5ea6\u6362\u7b97，\u8fd0\u7b97\u524d\u628a\u64cd\u4f5c\u6570\u8f6c\u6210\u6d6e\u70b9，\u907f\u514d\u6574\u6570\u9664\u6cd5\u622a\u65ad\u3002<\/p>\n

\u9519\u8bef\u94fe\u8def\u5982\u4e0b：<\/p>\n

#mermaid-svg-XCKWDqOJiXtYEZPq{font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;font-size:16px;fill:#333;}@keyframes edge-animation-frame{from{stroke-dashoffset:0;}}@keyframes dash{to{stroke-dashoffset:0;}}#mermaid-svg-XCKWDqOJiXtYEZPq .edge-animation-slow{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 50s linear infinite;stroke-linecap:round;}#mermaid-svg-XCKWDqOJiXtYEZPq .edge-animation-fast{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 20s linear infinite;stroke-linecap:round;}#mermaid-svg-XCKWDqOJiXtYEZPq .error-icon{fill:#552222;}#mermaid-svg-XCKWDqOJiXtYEZPq .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-XCKWDqOJiXtYEZPq .edge-thickness-normal{stroke-width:1px;}#mermaid-svg-XCKWDqOJiXtYEZPq .edge-thickness-thick{stroke-width:3.5px;}#mermaid-svg-XCKWDqOJiXtYEZPq .edge-pattern-solid{stroke-dasharray:0;}#mermaid-svg-XCKWDqOJiXtYEZPq .edge-thickness-invisible{stroke-width:0;fill:none;}#mermaid-svg-XCKWDqOJiXtYEZPq .edge-pattern-dashed{stroke-dasharray:3;}#mermaid-svg-XCKWDqOJiXtYEZPq .edge-pattern-dotted{stroke-dasharray:2;}#mermaid-svg-XCKWDqOJiXtYEZPq .marker{fill:#333333;stroke:#333333;}#mermaid-svg-XCKWDqOJiXtYEZPq .marker.cross{stroke:#333333;}#mermaid-svg-XCKWDqOJiXtYEZPq svg{font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;font-size:16px;}#mermaid-svg-XCKWDqOJiXtYEZPq p{margin:0;}#mermaid-svg-XCKWDqOJiXtYEZPq .label{font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;color:#333;}#mermaid-svg-XCKWDqOJiXtYEZPq .cluster-label text{fill:#333;}#mermaid-svg-XCKWDqOJiXtYEZPq .cluster-label span{color:#333;}#mermaid-svg-XCKWDqOJiXtYEZPq .cluster-label span p{background-color:transparent;}#mermaid-svg-XCKWDqOJiXtYEZPq .label text,#mermaid-svg-XCKWDqOJiXtYEZPq span{fill:#333;color:#333;}#mermaid-svg-XCKWDqOJiXtYEZPq .node rect,#mermaid-svg-XCKWDqOJiXtYEZPq .node circle,#mermaid-svg-XCKWDqOJiXtYEZPq .node ellipse,#mermaid-svg-XCKWDqOJiXtYEZPq .node polygon,#mermaid-svg-XCKWDqOJiXtYEZPq .node path{fill:#ECECFF;stroke:#9370DB;stroke-width:1px;}#mermaid-svg-XCKWDqOJiXtYEZPq .rough-node .label text,#mermaid-svg-XCKWDqOJiXtYEZPq .node .label text,#mermaid-svg-XCKWDqOJiXtYEZPq .image-shape .label,#mermaid-svg-XCKWDqOJiXtYEZPq .icon-shape .label{text-anchor:middle;}#mermaid-svg-XCKWDqOJiXtYEZPq .node .katex path{fill:#000;stroke:#000;stroke-width:1px;}#mermaid-svg-XCKWDqOJiXtYEZPq .rough-node .label,#mermaid-svg-XCKWDqOJiXtYEZPq .node .label,#mermaid-svg-XCKWDqOJiXtYEZPq .image-shape .label,#mermaid-svg-XCKWDqOJiXtYEZPq .icon-shape .label{text-align:center;}#mermaid-svg-XCKWDqOJiXtYEZPq .node.clickable{cursor:pointer;}#mermaid-svg-XCKWDqOJiXtYEZPq .root .anchor path{fill:#333333!important;stroke-width:0;stroke:#333333;}#mermaid-svg-XCKWDqOJiXtYEZPq .arrowheadPath{fill:#333333;}#mermaid-svg-XCKWDqOJiXtYEZPq .edgePath .path{stroke:#333333;stroke-width:2.0px;}#mermaid-svg-XCKWDqOJiXtYEZPq .flowchart-link{stroke:#333333;fill:none;}#mermaid-svg-XCKWDqOJiXtYEZPq .edgeLabel{background-color:rgba(232,232,232, 0.8);text-align:center;}#mermaid-svg-XCKWDqOJiXtYEZPq .edgeLabel p{background-color:rgba(232,232,232, 0.8);}#mermaid-svg-XCKWDqOJiXtYEZPq .edgeLabel rect{opacity:0.5;background-color:rgba(232,232,232, 0.8);fill:rgba(232,232,232, 0.8);}#mermaid-svg-XCKWDqOJiXtYEZPq .labelBkg{background-color:rgba(232, 232, 232, 0.5);}#mermaid-svg-XCKWDqOJiXtYEZPq .cluster rect{fill:#ffffde;stroke:#aaaa33;stroke-width:1px;}#mermaid-svg-XCKWDqOJiXtYEZPq .cluster text{fill:#333;}#mermaid-svg-XCKWDqOJiXtYEZPq .cluster span{color:#333;}#mermaid-svg-XCKWDqOJiXtYEZPq div.mermaidTooltip{position:absolute;text-align:center;max-width:200px;padding:2px;font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;font-size:12px;background:hsl(80, 100%, 96.2745098039%);border:1px solid #aaaa33;border-radius:2px;pointer-events:none;z-index:100;}#mermaid-svg-XCKWDqOJiXtYEZPq .flowchartTitleText{text-anchor:middle;font-size:18px;fill:#333;}#mermaid-svg-XCKWDqOJiXtYEZPq rect.text{fill:none;stroke-width:0;}#mermaid-svg-XCKWDqOJiXtYEZPq .icon-shape,#mermaid-svg-XCKWDqOJiXtYEZPq .image-shape{background-color:rgba(232,232,232, 0.8);text-align:center;}#mermaid-svg-XCKWDqOJiXtYEZPq .icon-shape p,#mermaid-svg-XCKWDqOJiXtYEZPq .image-shape p{background-color:rgba(232,232,232, 0.8);padding:2px;}#mermaid-svg-XCKWDqOJiXtYEZPq .icon-shape .label rect,#mermaid-svg-XCKWDqOJiXtYEZPq .image-shape .label rect{opacity:0.5;background-color:rgba(232,232,232, 0.8);fill:rgba(232,232,232, 0.8);}#mermaid-svg-XCKWDqOJiXtYEZPq .label-icon{display:inline-block;height:1em;overflow:visible;vertical-align:-0.125em;}#mermaid-svg-XCKWDqOJiXtYEZPq .node .label-icon path{fill:currentColor;stroke:revert;stroke-width:revert;}#mermaid-svg-XCKWDqOJiXtYEZPq :root{–mermaid-font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;}<\/span><\/span><\/p>\n

\u662f<\/p>\n

<\/span><\/span><\/span><\/p>\n

\u5426<\/p>\n

<\/span><\/span><\/p>\n

int raw = 2000<\/p>\n

<\/span><\/p>\n

raw \/ 4095<\/p>\n

<\/span><\/p>\n

\u4e24\u4e2a int \u76f8\u9664?<\/p>\n

<\/span><\/p>\n

\u6574\u6570\u9664\u6cd5 \u622a\u65ad = 0<\/p>\n

<\/span><\/p>\n

0 * 3.3f = 0.0f<\/p>\n

<\/span><\/p>\n

v = 0.0V（\u9519）<\/p>\n

<\/span><\/p>\n

\u6d6e\u70b9\u9664\u6cd5 \u4fdd\u7559\u5c0f\u6570<\/p>\n

<\/span><\/p>\n

v = 1.612V（\u5bf9）<\/p>\n

<\/span><\/p>\n

3.2 \u4e3a\u4ec0\u4e48"\u7aef\u70b9\u5bf9\u3001\u4e2d\u95f4\u9519"<\/h4>\n

raw=0 \u2192 0（\u5bf9），raw=4095 \u2192 1*3.3=3.3（\u5bf9），\u4e2d\u95f4\u503c（\u5982 2000）\u5168\u88ab\u622a\u65ad\u6210 0 \u2192 \u8868\u73b0\u4e3a"\u8df3\u53d8\/\u4e22\u7cbe\u5ea6"\u3002<\/p>\n

\u56db\u3001\u6b63\u786e\u89e3\u6cd5：\u5148\u8f6c\u6d6e\u70b9\u518d\u8fd0\u7b97（\u5b8c\u6574\u843d\u5730）<\/h3>\n

4.1 \u65b9\u6848\u5bf9\u6bd4<\/h4>\n\n\u65b9\u6848\u7cbe\u5ea6\u8bf4\u660e<\/tr>\n\n\n\n
int\/int \u518d\u8f6c float<\/td>\n\u4e22<\/td>\n\u9519<\/td>\n<\/tr>\n
\u8f6c float \u518d\u9664<\/td>\n\u4fdd<\/td>\n\u6b63\u89e3<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

4.2 \u914d\u7f6e（\u7167\u7740\u70b9）<\/h4>\n

\u5f00 -Wconversion（GCC）\u4f1a\u5bf9\u9690\u5f0f\u7a84\u5316\u8f6c\u6362\u8b66\u544a\u3002<\/p>\n

4.3 \u5b8c\u6574\u4ee3\u7801<\/h4>\n

\/\/ \u2705 \u6b63\u786e：\u8fd0\u7b97\u524d\u8f6c\u6d6e\u70b9<\/span>
\nint<\/span> raw =<\/span> 2000<\/span>;<\/span>
\nfloat<\/span> v =<\/span> (<\/span>float<\/span>)<\/span>raw \/<\/span> 4095.0f<\/span> *<\/span> 3.3f<\/span>;<\/span> \/\/ \u6d6e\u70b9\u57df\u9664\u6cd5，\u4fdd\u7559\u5c0f\u6570 \u2192 1.612V<\/span>
\n\/\/ \u6216\u4e58 1.0f \u89e6\u53d1\u63d0\u5347<\/span>
\nfloat<\/span> v2 =<\/span> raw *<\/span> 1.0f<\/span> \/<\/span> 4095<\/span> *<\/span> 3.3f<\/span>;<\/span><\/p>\n

[\u5751] \u4e24\u4e2a\u7ffb\u8f66\u70b9\u6536\u597d：<\/p>\n

  • int\/int \u5148\u622a\u65ad\u2014\u2014\u7cbe\u5ea6\u4e22\u6839\u56e0；\u8fd0\u7b97\u524d\u8f6c (float) \u6216\u4e58 1.0f\u3002<\/li>\n
  • \u53cd\u8fc7\u6765 float \u8f6c int \u4e22\u5c0f\u6570+\u53ef\u80fd\u6ea2\u51fa\u2014\u2014\u5927 float \u8f6c int \u672a\u5b9a\u4e49；\u9700 lround\/\u8303\u56f4\u68c0\u67e5\u3002<\/li>\n

    \u6b63\u786e\u89e3\u6cd5\u6d41\u7a0b\u5982\u4e0b：<\/p>\n

    #mermaid-svg-776o700PMgFICs4N{font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;font-size:16px;fill:#333;}@keyframes edge-animation-frame{from{stroke-dashoffset:0;}}@keyframes dash{to{stroke-dashoffset:0;}}#mermaid-svg-776o700PMgFICs4N .edge-animation-slow{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 50s linear infinite;stroke-linecap:round;}#mermaid-svg-776o700PMgFICs4N .edge-animation-fast{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 20s linear infinite;stroke-linecap:round;}#mermaid-svg-776o700PMgFICs4N .error-icon{fill:#552222;}#mermaid-svg-776o700PMgFICs4N .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-776o700PMgFICs4N .edge-thickness-normal{stroke-width:1px;}#mermaid-svg-776o700PMgFICs4N .edge-thickness-thick{stroke-width:3.5px;}#mermaid-svg-776o700PMgFICs4N .edge-pattern-solid{stroke-dasharray:0;}#mermaid-svg-776o700PMgFICs4N .edge-thickness-invisible{stroke-width:0;fill:none;}#mermaid-svg-776o700PMgFICs4N .edge-pattern-dashed{stroke-dasharray:3;}#mermaid-svg-776o700PMgFICs4N .edge-pattern-dotted{stroke-dasharray:2;}#mermaid-svg-776o700PMgFICs4N .marker{fill:#333333;stroke:#333333;}#mermaid-svg-776o700PMgFICs4N .marker.cross{stroke:#333333;}#mermaid-svg-776o700PMgFICs4N svg{font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;font-size:16px;}#mermaid-svg-776o700PMgFICs4N p{margin:0;}#mermaid-svg-776o700PMgFICs4N .label{font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;color:#333;}#mermaid-svg-776o700PMgFICs4N .cluster-label text{fill:#333;}#mermaid-svg-776o700PMgFICs4N .cluster-label span{color:#333;}#mermaid-svg-776o700PMgFICs4N .cluster-label span p{background-color:transparent;}#mermaid-svg-776o700PMgFICs4N .label text,#mermaid-svg-776o700PMgFICs4N span{fill:#333;color:#333;}#mermaid-svg-776o700PMgFICs4N .node rect,#mermaid-svg-776o700PMgFICs4N .node circle,#mermaid-svg-776o700PMgFICs4N .node ellipse,#mermaid-svg-776o700PMgFICs4N .node polygon,#mermaid-svg-776o700PMgFICs4N .node path{fill:#ECECFF;stroke:#9370DB;stroke-width:1px;}#mermaid-svg-776o700PMgFICs4N .rough-node .label text,#mermaid-svg-776o700PMgFICs4N .node .label text,#mermaid-svg-776o700PMgFICs4N .image-shape .label,#mermaid-svg-776o700PMgFICs4N .icon-shape .label{text-anchor:middle;}#mermaid-svg-776o700PMgFICs4N .node .katex path{fill:#000;stroke:#000;stroke-width:1px;}#mermaid-svg-776o700PMgFICs4N .rough-node .label,#mermaid-svg-776o700PMgFICs4N .node .label,#mermaid-svg-776o700PMgFICs4N .image-shape .label,#mermaid-svg-776o700PMgFICs4N .icon-shape .label{text-align:center;}#mermaid-svg-776o700PMgFICs4N .node.clickable{cursor:pointer;}#mermaid-svg-776o700PMgFICs4N .root .anchor path{fill:#333333!important;stroke-width:0;stroke:#333333;}#mermaid-svg-776o700PMgFICs4N .arrowheadPath{fill:#333333;}#mermaid-svg-776o700PMgFICs4N .edgePath .path{stroke:#333333;stroke-width:2.0px;}#mermaid-svg-776o700PMgFICs4N .flowchart-link{stroke:#333333;fill:none;}#mermaid-svg-776o700PMgFICs4N .edgeLabel{background-color:rgba(232,232,232, 0.8);text-align:center;}#mermaid-svg-776o700PMgFICs4N .edgeLabel p{background-color:rgba(232,232,232, 0.8);}#mermaid-svg-776o700PMgFICs4N .edgeLabel rect{opacity:0.5;background-color:rgba(232,232,232, 0.8);fill:rgba(232,232,232, 0.8);}#mermaid-svg-776o700PMgFICs4N .labelBkg{background-color:rgba(232, 232, 232, 0.5);}#mermaid-svg-776o700PMgFICs4N .cluster rect{fill:#ffffde;stroke:#aaaa33;stroke-width:1px;}#mermaid-svg-776o700PMgFICs4N .cluster text{fill:#333;}#mermaid-svg-776o700PMgFICs4N .cluster span{color:#333;}#mermaid-svg-776o700PMgFICs4N div.mermaidTooltip{position:absolute;text-align:center;max-width:200px;padding:2px;font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;font-size:12px;background:hsl(80, 100%, 96.2745098039%);border:1px solid #aaaa33;border-radius:2px;pointer-events:none;z-index:100;}#mermaid-svg-776o700PMgFICs4N .flowchartTitleText{text-anchor:middle;font-size:18px;fill:#333;}#mermaid-svg-776o700PMgFICs4N rect.text{fill:none;stroke-width:0;}#mermaid-svg-776o700PMgFICs4N .icon-shape,#mermaid-svg-776o700PMgFICs4N .image-shape{background-color:rgba(232,232,232, 0.8);text-align:center;}#mermaid-svg-776o700PMgFICs4N .icon-shape p,#mermaid-svg-776o700PMgFICs4N .image-shape p{background-color:rgba(232,232,232, 0.8);padding:2px;}#mermaid-svg-776o700PMgFICs4N .icon-shape .label rect,#mermaid-svg-776o700PMgFICs4N .image-shape .label rect{opacity:0.5;background-color:rgba(232,232,232, 0.8);fill:rgba(232,232,232, 0.8);}#mermaid-svg-776o700PMgFICs4N .label-icon{display:inline-block;height:1em;overflow:visible;vertical-align:-0.125em;}#mermaid-svg-776o700PMgFICs4N .node .label-icon path{fill:currentColor;stroke:revert;stroke-width:revert;}#mermaid-svg-776o700PMgFICs4N :root{–mermaid-font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;}<\/span><\/span><\/p>\n

    \u662f<\/p>\n

    <\/span><\/span><\/p>\n

    \u5426<\/p>\n

    <\/span><\/span><\/p>\n

    int raw = 2000<\/p>\n

    <\/span><\/p>\n

    (float)raw \/ 4095.0f<\/p>\n

    <\/span><\/p>\n

    \u8fd0\u7b97\u524d\u5df2\u8f6c\u6d6e\u70b9?<\/p>\n

    <\/span><\/p>\n

    \u6d6e\u70b9\u57df\u9664\u6cd5 \u4fdd\u7559\u5c0f\u6570<\/p>\n

    <\/span><\/p>\n

    1.612V（\u5bf9）<\/p>\n

    <\/span><\/p>\n

    \u6574\u6570\u9664\u6cd5 \u622a\u65ad<\/p>\n

    <\/span><\/p>\n

    0.0V（\u9519）<\/p>\n

    <\/span><\/p>\n

    4.4 \u6539\u5b8c\u5bf9\u6bd4<\/h4>\n\n\u6307\u6807\u6539\u524d\u6539\u540e<\/tr>\n\n\n\n
    raw=2000 \u7535\u538b<\/td>\n0.0V（\u9519）<\/td>\n1.612V<\/td>\n<\/tr>\n
    \u4e2d\u95f4\u503c\u7cbe\u5ea6<\/td>\n\u4e22<\/td>\n\u4fdd<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    \u4e94\u3001\u6536\u5c3e<\/h3>\n

    \u8981\u70b9\u590d\u76d8<\/p>\n

  • int\/int \u662f\u6574\u6570\u9664\u6cd5（\u622a\u65ad），\u518d\u8f6c float \u5df2\u665a，\u7cbe\u5ea6\u4e22\u5931\u3002<\/li>\n
  • \u6807\u5ea6\u6362\u7b97\u524d\u628a\u64cd\u4f5c\u6570\u8f6c\u6d6e\u70b9，\u6d6e\u70b9\u57df\u8fd0\u7b97\u4fdd\u7cbe\u5ea6\u3002<\/li>\n
  • float\u2192int \u53cd\u4e4b\u4e5f\u4e22\u5c0f\u6570\u4e14\u53ef\u80fd\u6ea2\u51fa，\u9700\u8c28\u614e\u3002<\/li>\n

    \u6700\u4f73\u5b9e\u8df5\u6e05\u5355<\/p>\n

      \n
    • \u9664\u6cd5\u6807\u5ea6：\u7528 (float)a \/ b \u6216 *1.0f \u89e6\u53d1\u6d6e\u70b9\u9664\u6cd5\u3002<\/li>\n
    • \u660e\u786e\u6bcf\u6b65\u8fd0\u7b97\u7c7b\u578b，\u907f\u514d\u9690\u5f0f\u622a\u65ad\u3002<\/li>\n
    • \u5f00 -Wconversion \u6293\u9690\u5f0f\u7a84\u5316\u3002<\/li>\n
    • \u5927\u6570\u503c float\u2192int \u7528 lround + \u8303\u56f4\u68c0\u67e5\u9632\u6ea2\u51fa\u3002<\/li>\n
    • \u5b9a\u70b9\u8fd0\u7b97（Q \u683c\u5f0f）\u53ef\u907f\u514d\u6d6e\u70b9\u5f00\u9500，\u9002\u5408\u65e0 FPU MCU\u3002<\/li>\n<\/ul>\n

      \u8fdb\u9636\u5ef6\u4f38：\u65e0 FPU \u7684 MCU \u7528 Q \u683c\u5f0f\u5b9a\u70b9\u6570（\u6574\u6570+\u7f29\u653e\u56e0\u5b50）\u66ff\u4ee3 float，\u65e2\u5feb\u53c8\u65e0\u7cbe\u5ea6\u622a\u65ad\u5751；\u6ce8\u610f Q \u683c\u5f0f\u4e58\u9664\u7684\u79fb\u4f4d\u3002<\/p>\n

      \u4e92\u52a8：\u4f60\u7c7b\u578b\u8f6c\u6362\u8fd8\u8e29\u8fc7\u5565？uint8 \u8fd0\u7b97\u56de\u7ed5\u3001double \u622a\u65ad\u3001\u9690\u5f0f\u63d0\u5347（\u7b2c42\u8bb2）？\u8bc4\u8bba\u533a\u804a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

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