\u6211\u4eec\u7684PWM\u53e3\u53ea\u80fd\u901a\u8fc7\u8f93\u51fa\u5360\u7a7a\u6bd4\u6765\u8f93\u51fa\u6a21\u62df\u91cf\uff0c\u4f46\u662f\u5982\u679c\u8981\u8f93\u51fa1-60KHz\u6216\u66f4\u9ad8\u7684\u8109\u51b2\u9891\u7387\u7684\u8bdd\uff0c\u5c31\u4e0d\u597d\u505a\u5230\u5566\u3002\u6211\u4e00\u76f4\u5728\u9700\u627e\u89e3\u51b3\u65b9\u6848\uff0c\u65e0\u610f\u4e2d\u627e\u5230\u5566\uff0c\u73b0\u63d0\u4f9b\u7ed9\u5927\u5bb6\u5206\u4eab\uff0c\u5e0c\u671b\u80fd\u6709\u6240\u5e2e\u52a9\u3002<\/p>\n
\u6e90\u4ee3\u7801\u5982\u4e0b\uff1aHere are some usage examples of the function:<\/p>\n
\/\/ Set pin 9’s PWM frequency to 3906 Hz (31250\/8 = 3906) <\/span>\/\/ Set pin 6’s PWM frequency to 62500 Hz (62500\/1 = 62500) <\/span>\/\/ Set pin 10’s PWM frequency to 31 Hz (31250\/1024 = 31) Please keep in mind that changing the PWM frequency changes the Atmega’s timers and disrupts the normal operation of many functions that rely on time (delay(), millis(), Servo library).<\/p>\n \/** \u63d0\u4f9b\u53c2\u8003\u7f51\u5740\uff1a \u6211\u4eec\u7684PWM\u53e3\u53ea\u80fd\u901a\u8fc7\u8f93\u51fa\u5360\u7a7a\u6bd4\u6765\u8f93\u51fa\u6a21\u62df\u91cf\uff0c\u4f46\u662f\u5982\u679c\u8981\u8f93\u51fa1-60KHz\u6216\u66f4\u9ad8\u7684\u8109\u51b2\u9891\u7387\u7684\u8bdd\uff0c\u5c31\u4e0d\u597d\u505a\u5230\u5566\u3002 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[19,13],"tags":[],"class_list":["post-1073","post","type-post","status-publish","format-standard","hentry","category-arduino","category-13"],"_links":{"self":[{"href":"https:\/\/www.kumouse.com\/index.php?rest_route=\/wp\/v2\/posts\/1073","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.kumouse.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.kumouse.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.kumouse.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.kumouse.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1073"}],"version-history":[{"count":1,"href":"https:\/\/www.kumouse.com\/index.php?rest_route=\/wp\/v2\/posts\/1073\/revisions"}],"predecessor-version":[{"id":1074,"href":"https:\/\/www.kumouse.com\/index.php?rest_route=\/wp\/v2\/posts\/1073\/revisions\/1074"}],"wp:attachment":[{"href":"https:\/\/www.kumouse.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1073"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.kumouse.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1073"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.kumouse.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1073"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\n\/\/ Note that the base frequency for pins 3, 9, 10, and 11 is 31250 Hz
\n<\/span><\/i>setPwmFrequency(<\/span>9<\/span>,<\/span> 8<\/span>)<\/span>;<\/p>\n
\n\/\/ Note that the base frequency for pins 5 and 6 is 62500 Hz
\n<\/span><\/i>setPwmFrequency(<\/span>6<\/span>,<\/span> 1<\/span>)<\/span>;<\/p>\n
\n<\/span><\/i>setPwmFrequency(<\/span>10<\/span>,<\/span> 1024<\/span>)<\/span>;<\/span><\/p>\n
\n* Divides a given PWM pin frequency by a divisor.
\n*
\n* The resulting frequency is equal to the base frequency divided by
\n* the given divisor:
\n*\u00a0 \u00a0– Base frequencies:
\n*\u00a0 \u00a0\u00a0 \u00a0o The base frequency for pins 3, 9, 10, and 11 is 31250 Hz.
\n*\u00a0 \u00a0\u00a0 \u00a0o The base frequency for pins 5 and 6 is 62500 Hz.
\n*\u00a0 \u00a0– Divisors:
\n*\u00a0 \u00a0\u00a0 \u00a0o The divisors available on pins 5, 6, 9 and 10 are: 1, 8, 64,
\n*\u00a0 \u00a0\u00a0 \u00a0\u00a0\u00a0256, and 1024.
\n*\u00a0 \u00a0\u00a0 \u00a0o The divisors available on pins 3 and 11 are: 1, 8, 32, 64,
\n*\u00a0 \u00a0\u00a0 \u00a0\u00a0\u00a0128, 256, and 1024.
\n*
\n* PWM frequencies are tied together in pairs of pins. If one in a
\n* pair is changed, the other is also changed to match:
\n*\u00a0 \u00a0– Pins 5 and 6 are paired on timer0
\n*\u00a0 \u00a0– Pins 9 and 10 are paired on timer1
\n*\u00a0 \u00a0– Pins 3 and 11 are paired on timer2
\n*
\n* Note that this function will have side effects on anything else
\n* that uses timers:
\n*\u00a0 \u00a0– Changes on pins 3, 5, 6, or 11 may cause the delay() and
\n*\u00a0 \u00a0\u00a0\u00a0millis() functions to stop working. Other timing-related
\n*\u00a0 \u00a0\u00a0\u00a0functions may also be affected.
\n*\u00a0 \u00a0– Changes on pins 9 or 10 will cause the Servo library to function
\n*\u00a0 \u00a0\u00a0\u00a0incorrectly.
\n*
\n* Thanks to macegr of the Arduino forums for his documentation of the
\n* PWM frequency divisors. His post can be viewed at:
\n*\u00a0 \u00a0http:\/\/www.arduino.cc\/cgi-bin\/yabb2\/YaBB.pl?num=1235060559\/0#4<\/a>
\n*\/
\n<\/span><\/i>void<\/span> setPwmFrequency(<\/span>int<\/span> pin,<\/span> int<\/span> divisor)<\/span> {
\n<\/span>\u00a0\u00a0byte mode;
\n<\/span>\u00a0\u00a0if<\/span>(<\/span>pin ==<\/span> 5<\/span> ||<\/span> pin ==<\/span> 6<\/span> ||<\/span> pin ==<\/span> 9<\/span> ||<\/span> pin ==<\/span> 10<\/span>)<\/span> {
\n<\/span>\u00a0 \u00a0 switch<\/span>(<\/span>divisor)<\/span> {
\n<\/span>\u00a0 \u00a0\u00a0 \u00a0case<\/span> 1<\/span>:<\/span> mode =<\/span> 0x01<\/span>;<\/span> break<\/strong>;
\n<\/span>\u00a0 \u00a0\u00a0 \u00a0case<\/span> 8<\/span>:<\/span> mode =<\/span> 0x02<\/span>;<\/span> break<\/strong>;
\n<\/span>\u00a0 \u00a0\u00a0 \u00a0case<\/span> 64<\/span>:<\/span> mode =<\/span> 0x03<\/span>;<\/span> break<\/strong>;
\n<\/span>\u00a0 \u00a0\u00a0 \u00a0case<\/span> 256<\/span>:<\/span> mode =<\/span> 0x04<\/span>;<\/span> break<\/strong>;
\n<\/span>\u00a0 \u00a0\u00a0 \u00a0case<\/span> 1024<\/span>:<\/span> mode =<\/span> 0x05<\/span>;<\/span> break<\/strong>;
\n<\/span>\u00a0 \u00a0\u00a0 \u00a0default<\/span>:<\/span> return<\/span>;
\n<\/span>\u00a0 \u00a0 }
\n<\/span>\u00a0 \u00a0 if<\/span>(<\/span>pin ==<\/span> 5<\/span> ||<\/span> pin ==<\/span> 6<\/span>)<\/span> {
\n<\/span>\u00a0 \u00a0\u00a0 \u00a0TCCR0B =<\/span> TCCR0B &<\/span> 0b11111000<\/span> |<\/span> mode;
\n<\/span>\u00a0 \u00a0 }<\/span> else<\/span> {
\n<\/span>\u00a0 \u00a0\u00a0 \u00a0TCCR1B =<\/span> TCCR1B &<\/span> 0b11111000<\/span> |<\/span> mode;
\n<\/span>\u00a0 \u00a0 }
\n<\/span>\u00a0\u00a0}<\/span> else<\/span> if<\/span>(<\/span>pin ==<\/span> 3<\/span> ||<\/span> pin ==<\/span> 11<\/span>)<\/span> {
\n<\/span>\u00a0 \u00a0 switch<\/span>(<\/span>divisor)<\/span> {
\n<\/span>\u00a0 \u00a0\u00a0 \u00a0case<\/span> 1<\/span>:<\/span> mode =<\/span> 0x01<\/span>;<\/span> break<\/strong>;
\n<\/span>\u00a0 \u00a0\u00a0 \u00a0case<\/span> 8<\/span>:<\/span> mode =<\/span> 0x02<\/span>;<\/span> break<\/strong>;
\n<\/span>\u00a0 \u00a0\u00a0 \u00a0case<\/span> 32<\/span>:<\/span> mode =<\/span> 0x03<\/span>;<\/span> break<\/strong>;
\n<\/span>\u00a0 \u00a0\u00a0 \u00a0case<\/span> 64<\/span>:<\/span> mode =<\/span> 0x04<\/span>;<\/span> break<\/strong>;
\n<\/span>\u00a0 \u00a0\u00a0 \u00a0case<\/span> 128<\/span>:<\/span> mode =<\/span> 0x05<\/span>;<\/span> break<\/strong>;
\n<\/span>\u00a0 \u00a0\u00a0 \u00a0case<\/span> 256<\/span>:<\/span> mode =<\/span> 0x06<\/span>;<\/span> break<\/strong>;
\n<\/span>\u00a0 \u00a0\u00a0 \u00a0case<\/span> 1024<\/span>:<\/span> mode =<\/span> 0x7<\/span>;<\/span> break<\/strong>;
\n<\/span>\u00a0 \u00a0\u00a0 \u00a0default<\/span>:<\/span> return<\/span>;
\n<\/span>\u00a0 \u00a0 }
\n<\/span>\u00a0 \u00a0 TCCR2B =<\/span> TCCR2B &<\/span> 0b11111000<\/span> |<\/span> mode;
\n<\/span>\u00a0\u00a0}
\n}<\/p>\n
\nhttp:\/\/arduino.cc\/playground\/Code\/PwmFrequency<\/a>
\nhttp:\/\/arduino.cc\/playground\/Main\/TimerPWMCheatsheet<\/a><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"