M0518的PWM例程是注释错了吗

1万 · 2018-10-18 20:06

    /*

      Configure PWM0 channel 0 init period and duty.

      Period is __HXT / (prescaler * clock divider * (CNR + 1))

      Duty ratio = (CMR + 1) / (CNR + 1)

      Period = 12 MHz / (2 * 1 * (199 + 1)) =  30000 Hz

      Duty ratio = (99 + 1) / (199 + 1) = 50%

    */

    // PWM0 channel 0 frequency is 100Hz, duty 30%,

    PWM_ConfigOutputChannel(PWM0, 0, 30000, 30);

这里写的频率是100Hz,但是下面写的3000，还是我理解错。

1万 · 2018-10-18 20:07

这个是函数原型

复制



 * [url=home.php?mod=space&uid=247401]@brief[/url] This function Configure PWM generator and get the nearest frequency in edge aligned auto-reload mode

 * @param[in] pwm The pointer of the specified PWM module

 *                - PWM0 : PWM Group 0

 *                - PWM1 : PWM Group 1

 * @param[in] u32ChannelNum PWM channel number. Valid values are between 0~5

 * @param[in] u32Frequency Target generator frequency

 * @param[in] u32DutyCycle Target generator duty cycle percentage. Valid range are between 0 ~ 100. 10 means 10%, 20 means 20%...

 * [url=home.php?mod=space&uid=266161]@return[/url] Nearest frequency clock in nano second

 * [url=home.php?mod=space&uid=536309]@NOTE[/url] Since every two channels, (0 & 1), (2 & 3), shares a prescaler. Call this API to configure PWM frequency may affect

 *       existing frequency of other channel.

 */

uint32_t PWM_ConfigOutputChannel(PWM_T *pwm, uint32_t u32ChannelNum, uint32_t u32Frequency, uint32_t u32DutyCycle)；

1万 · 2018-10-18 20:07

请大侠出来住持公道。我实在不懂

1万 · 2018-10-19 11:30

我看是错了吧。

只看该作者 · 2018-10-19 15:05

只要你觉得错的，肯定是错的。