7801 PWM模块单一通道实现双边沿捕获

/**

* Capture_init

*

* @param[in] void

* [url=home.php?mod=space&uid=266161]@return[/url] void

*

* [url=home.php?mod=space&uid=247401]@brief[/url] 捕获初始化

* 

*/

void Capture_init(void)

{

GPIO_SetFunc(GPIOB, GPIO_PIN3, GPIO_FUN1);





CKGEN_Enable(CLK_PWM0, ENABLE);

CKGEN_SoftReset(SRST_PWM0, ENABLE);



/* Set period value */

PWM_SetClockPrescaler(PWM0, 23);

PWM_SetCounterInitValue((PWM0), 0);

PWM_SetCounter((PWM0), 0);

PWM_SetMaxCountValue((PWM0), 65535);



PWM_SetCountMode(PWM0, PWM_UP_COUNT);



PWM_SetClockSource(PWM0, PWM_CLK_SOURCE_APB);



PWM_SetCallback(PWM0, CaptureIntCallback);

NVIC_EnableIRQ(PWM0_IRQn);





PWM_SetChannelMSR(PWM0, PWM_CH_6, 0U);

PWM_SetChannelELSR(PWM0, PWM_CH_6, PWM_BOTH_EDGE_DETECT);

PWM_SetCaptureEventPrescaler(PWM0, PWM_CH_6, PWM_EVENT_PSC_1);

PWM_SetChannelInterrupt(PWM0, PWM_CH_6, DISABLE);

}

/*!

* [url=home.php?mod=space&uid=247401]@brief[/url] capture start

*

* @param[in] 

* modemIndex - modem index (0, 1)

* channelIndex - channel index

* [url=home.php?mod=space&uid=266161]@return[/url] 

* 0 - fail

* 1 - success

* 

*/

uint8_t CapTime_StartCapture(PWM_Type* ptrCaptureModem, uint8_t channelIndex)

{

memset(g_capture_buf, 0, sizeof(g_capture_buf));

g_capEdgeCounter = 0;

PWM_SetChannelInterrupt(ptrCaptureModem, (PWM_ChannelType)channelIndex, ENABLE);

PWM_SetChannelELSR(ptrCaptureModem, (PWM_ChannelType)channelIndex, 0x03);



return 1;

}





/*!

* @brief capture stop

*

* @param[in] 

* modemIndex - modem index (0, 1)

* channelIndex - channel index

* @return 

* 0 - fail

* 1 - success

* 

*/

uint8_t CapTime_StopCapture(PWM_Type* ptrCaptureModem, uint8_t channelIndex)

{

PWM_SetChannelELSR(ptrCaptureModem, (PWM_ChannelType)channelIndex, 0x00);

PWM_SetChannelInterrupt(ptrCaptureModem, (PWM_ChannelType)channelIndex, DISABLE);



return 1;

}