{"id":312,"date":"2019-01-22T09:43:09","date_gmt":"2019-01-22T01:43:09","guid":{"rendered":"http:\/\/www.inhhh.com\/blog\/?p=312"},"modified":"2019-01-22T10:32:52","modified_gmt":"2019-01-22T02:32:52","slug":"%e6%a0%91%e8%8e%93%e6%b4%be%e8%bf%9b%e9%98%b6%e4%b9%8b%e8%b7%af-013-%e6%a0%91%e8%8e%93%e6%b4%be23-c%e8%af%ad%e8%a8%80%e4%bd%bf%e7%94%a8pwm","status":"publish","type":"post","link":"http:\/\/www.inhhh.com\/blog\/?p=312","title":{"rendered":"\u6811\u8393\u6d3e\u8fdb\u9636\u4e4b\u8def (013) – \u6811\u8393\u6d3e2\/3 C\u8bed\u8a00\u4f7f\u7528PWM"},"content":{"rendered":"

\u7531\u4e8e\u6811\u8393\u6d3e\u53ea\u67091,12\u4e24\u4e2a\u53e3\u6709pwm,\u4e8e\u662f\u4f7f\u7528<\/p>\n

softPwmCreate(LED, 0, 100);  \/\/\u521b\u5efa\u8f6fPWM<\/pre>\n
softPwmWrite(LED, i);<\/pre>\n
\u8fd9\u4e24\u4e2a\u5b8c\u6210\u4e86\u5de5\u4f5c<\/p>\n
 <\/p>\n
\u6587\u7ae0\u539f\u6765\u7684\u8def\u5f84\uff1ahttps:\/\/www.cnblogs.com\/jikexianfeng\/p\/6938119.html
\n====================================
\n\u6211\u624b\u91cc\u9762\u7684\u662f\u6811\u8393\u6d3e3\uff0c\u7cfb\u7edf\u662fRaspbian\u5b98\u65b9\u64cd\u4f5c\u7cfb\u7edf\uff0c\u5df2\u7ecf\u5b89\u88c5\u597d\u4e86wiringPi\u3002\u00a0 \u00a0\u00a0 \u00a0\u00a0\u00a0PWM\u7b80\u4ecb:\u8109\u5bbd\u8c03\u5236(PWM)\u662f\u6307\u7528\u5fae\u5904\u7406\u5668\u7684\u6570\u5b57\u8f93\u51fa\u6765\u5bf9\u6a21\u62df\u7535\u8def\u8fdb\u884c\u63a7\u5236\uff0c\u662f\u4e00\u79cd\u5bf9\u6a21\u62df\u4fe1\u53f7\u7535\u5e73\u8fdb\u884c\u6570\u5b57\u7f16\u7801\u7684\u65b9\u6cd5\u3002wiringpi\u6709\u4e24\u79cd\u65b9\u5f0f\u4ea7\u751fPWM\uff0c\u7b2c\u4e00\u79cd\u4e3a\u6811\u8393\u6d3e\u786c\u4ef6PWM\uff0c\u5982\u679c\u9700\u8981\u7cbe\u786e\u7684PWM\u63a7\u5236\u7684\u8bdd\uff0c\u6700\u597d\u4f7f\u7528\u786c\u4ef6PWM\u3002\u7b2c\u4e8c\u79cd\u4e3awiringpi\u8f6f\u4ef6\u6a21\u62df\u7684pwm\uff0c\u6211\u4eec\u4e00\u79cd\u4e00\u79cd\u7684\u4ecb\u7ecd\u3002
\n\u9996\u5148\u662f\u7535\u8def\u8fde\u63a5\uff0c\u51c6\u5907\u505a\u4e00\u4e2aLED\u547c\u5438\u706f\u7a0b\u5e8f\u3002\u6240\u4ee5\u7535\u8def\u5f88\u7b80\u5355\uff0c\u4e00\u4e2aLED\uff0c\u4e00\u4e2a100\u03a9\u7684\u7535\u963b\u3002\u7535\u963b\u4e32\u8054\u5728LED\u6b63\u6781\uff0c\u7136\u540e\u8fde\u63a5\u5230\u6811\u8393\u6d3e12\u53f7\u5f15\u811a\u3002LED\u8d1f\u6781\u63a5\u5730\u3002
\n\u4e00\u3001\u786c\u4ef6PWM\u3002
\n\u786c\u4ef6PWM IO\u53e3\u4e3a\u7269\u7406\u768412\u53f7\u7aef\u53e3\uff08\u5f53\u7136\uff0c\u8fd9\u4e2a\u4e5f\u4f5c\u4e3a\u8f6f\u4ef6PWM\u4f7f\u7528\uff09\u3002\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n
<\/p>\n
1\u3001\u4f7f\u7528C\u8bed\u8a00\u7f16\u5199\u786c\u4ef6PWM\u7a0b\u5e8f<\/div>\n
<\/div>\n
<\/div>\n
\n
\n
pi@Raspi:~ $ sudo nano hardware_pwd.c<\/pre>\n<\/div>\n
2\u3001\u5199\u5165\u4ee5\u4e0b\u7a0b\u5e8f<\/p>\n
\n
\"\u590d\u5236\u4ee3\u7801\"<\/a><\/span><\/div>\n
 1 #include <stdio.h>\r\n 2 #include <stdlib.h>\r\n 3 #include <stdint.h>\r\n 4 #include <wiringPi.h>\r\n 5 \r\n 6 #define LED 1\r\n 7 \r\n 8 int main(void)\r\n 9 {\r\n10     int bright;\r\n11     printf(\"Raspberry Pi wiringPi PWM test program\\n\");\r\n12     if (wiringPiSetup() == -1)\r\n13     {\r\n14         printf(\"GPIO setup error!\\n\");\r\n15         exit(1);\r\n16     }\r\n17     pinMode(LED,PWM_OUTPUT);\r\n18     while(1)\r\n19     {\r\n20     for (bright = 0; bright < 1024; ++bright)\r\n21         {\r\n22             pwmWrite(LED,bright);\r\n23             delay(12);\r\n24         }\r\n25     for (bright = 1023; bright >= 0; --bright)\r\n26         {\r\n27             pwmWrite(LED,bright);\r\n28             delay(12);\r\n29         }\r\n30     }\r\n31     return 0;\r\n32 }<\/pre>\n
\"\u590d\u5236\u4ee3\u7801\"<\/a><\/span><\/div>\n<\/div>\n
3\u3001\u7f16\u8bd1<\/p>\n
\n
pi@Raspi:~ $ gcc -o hardware_pwd hardware_pwd.c -lwiringPi<\/pre>\n<\/div>\n
4\u3001\u8fd0\u884c<\/p>\n
\n
pi@Raspi:~ $ sudo .\/hardware_pwd<\/pre>\n<\/div>\n
\u73b0\u5728\u5e94\u8be5\u53ef\u4ee5\u770b\u5230\u4f60\u7684LED\u6709\u547c\u5438\u706f\u6548\u679c\u4e86\u3002<\/p>\n
\n
\"\u590d\u5236\u4ee3\u7801\"<\/a><\/span><\/div>\n
 1 \/*\r\n 2  ============================================================================\r\n 3  Name        : software_pwm.c\r\n 4  Author      : Cheetah\r\n 5  Version     :\r\n 6  Copyright   : Geeiot\r\n 7  Description : PWM in C, Ansi-style\r\n 8  ============================================================================\r\n 9  *\/\r\n10 \r\n11 #include <stdio.h>\r\n12 #include <stdlib.h>\r\n13 #include <stdint.h>\r\n14 #include <wiringPi.h>\r\n15 #include <softPwm.h>\r\n16 \r\n17 #define LED 1   \/\/\u540c\u6837\u4f7f\u75281\u53f7IO\u53e3\r\n18 \r\n19 int main(void) \r\n20 {\r\n21     int i = 0;\r\n22     if (wiringPiSetup() == -1)  \/\/\u521d\u59cb\u5316wiringpi\r\n23     {\r\n24         printf(\"Setup GPIO error!\\n\");\r\n25         return -1;\r\n26     }\r\n27     softPwmCreate(LED, 0, 100);  \/\/\u521b\u5efa\u8f6fPWM\r\n28     while (1) \r\n29     {\r\n30         for (i = 0; i < 100; i++) \r\n31         {\r\n32             softPwmWrite(LED, i);\r\n33             delay(10);\r\n34         }\r\n35         for (i = 99; i > 0; i--) \r\n36         {\r\n37             softPwmWrite(LED, i);\r\n38             delay(10);\r\n39         }\r\n40     }\r\n41     return 0;\r\n42 }<\/pre>\n
\"\u590d\u5236\u4ee3\u7801\"<\/a><\/span><\/div>\n<\/div>\n
\u4e8c\u3001\u8f6f\u4ef6\u6a21\u62dfPWM
\nwiringPi \u4e2d\u5305\u542b\u4e86\u4e00\u4e2a\u8f6f\u4ef6\u9a71\u52a2\u7684 PWM \u5904\u7406\u5e93,\u53ef\u4ee5\u5728\u4efb\u610f\u7684\u6811\u8393\u6d3e GPIO \u4e0a\u8f93\u51faPWM \u4fe1\u53f7\u3002\u4f46\u662f\u8f6f\u4ef6\u6a21\u62df\u7684PWM\u6709\u4e00\u4e9b\u9650\u5236\u3002\u56e0\u4e3aPWM\u7684\u9891\u7387\u8d8a\u9ad8\uff0c\u6240\u9700\u8981\u7684CPU\u8d44\u6e90\u8d8a\u591a\uff0c\u6240\u4ee5\u5728\u8fd9\u4e4b\u95f4\u6709\u4e00\u4e9b\u5e73\u8861\u3002
\n\u6b65\u9aa4\u540c\u4e0a\uff0c\u6211\u8fd9\u91cc\u5c31\u76f4\u63a5\u8d34\u51fa\u4ee3\u7801\u4e86\u3002\u7279\u522b\u6ce8\u610f\u7f16\u8bd1\u7684\u65f6\u5019\u4f1a\u591a\u4e00\u4e2a-lpthread\u9009\u9879\u3002<\/p>\n
\u7f16\u8bd1<\/p>\n
\n
pi@Raspi:~ $ gcc -o software_pwm software_pwm.c -lwiringPi -lpthread<\/pre>\n<\/div>\n
\u8fd0\u884c\u4e4b\u540e\u4f1a\u6709\u540c\u6837\u7684\u6548\u679c\uff01<\/p>\n
\u7279\u522b\u6ce8\u610f\uff1a\u5fc5\u987b\u4f7f\u7528 wiringPiSetup()\u3001 wiringPiSetupGpio()\u6216\u8005 wiringPiSetupPhys()\u51fd\u6570\u6765\u521d\u59cb\u5316 wiringPi\u3002wiringPiSetupSys()\u662f\u4e0c\u591f\u5feb\u7684,\u56e0\u6b64,\u5fc5\u987b\u4f7f\u7528 sudo \u547d\u4ee4\u6765\u8fd0\u884c\u7a0b\u5e8f\u3002
\n\u9644\u4e0awiringpi\u7528\u6237\u624b\u518c\u7684\u4e0b\u8f7d:https:\/\/www.geeiot.net\/forum.php … 1121&extra=page%3D1<\/a><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
\u7531\u4e8e\u6811\u8393\u6d3e\u53ea\u67091,12\u4e24\u4e2a\u53e3\u6709pwm,\u4e8e\u662f\u4f7f\u7528 softPwmCreate(LED, 0, 100); \/\/\u521b<\/p>\n
\n\t\t\t\t Read More <\/span> <\/i><\/a>\n\t\t\t<\/div>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"aside","meta":{"footnotes":""},"categories":[3],"tags":[54,55,53],"class_list":["post-312","post","type-post","status-publish","format-aside","hentry","category-it","tag-pwm","tag-softpwm","tag-53","post_format-post-format-aside"],"_links":{"self":[{"href":"http:\/\/www.inhhh.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/312","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.inhhh.com\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.inhhh.com\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.inhhh.com\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.inhhh.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=312"}],"version-history":[{"count":1,"href":"http:\/\/www.inhhh.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/312\/revisions"}],"predecessor-version":[{"id":313,"href":"http:\/\/www.inhhh.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/312\/revisions\/313"}],"wp:attachment":[{"href":"http:\/\/www.inhhh.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=312"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.inhhh.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=312"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.inhhh.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=312"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}