PWM定时器捕获功能
/**************************************************************************//*** @file main.c
* @versionV1.00
* $Revision: 8 $
* $Date: 16/07/22 10:25a $
* @brief Demonstrate how to use PWMA Channel 0 captures PWMA Channel 1 Waveform.
* @note
* Copyright (C) 2014~2015 Nuvoton Technology Corp. All rights reserved.
*
******************************************************************************/
#include <stdio.h>
#include "NUC123.h"
/*---------------------------------------------------------------------------------------------------------*/
/* Macro, type and constant definitions */
/*---------------------------------------------------------------------------------------------------------*/
#define PLLCON_SETTING CLK_PLLCON_72MHz_HXT
#define PLL_CLOCK 72000000
/*---------------------------------------------------------------------------------------------------------*/
/* Global variables */
/*---------------------------------------------------------------------------------------------------------*/
/**
* @brief PWMA IRQ Handler
*
* @param None
*
* @return None
*
* @Details ISR to handle PWMA interrupt event
*/
void PWMA_IRQHandler(void)
{
// uint32_t u32PwmIntFlag;
uint32_t u32CapIntFlag1;
/* Handle PWMA Capture function */
u32CapIntFlag1 = PWMA->CCR0;
/* PWMA channel 0 Capture interrupt */
if(u32CapIntFlag1 & PWM_CCR0_CAPIF0_Msk)
{
PWMA->CCR0 &= (PWM_CCR_MASK | PWM_CCR0_CAPIF0_Msk);
}
}
/*--------------------------------------------------------------------------------------*/
/* Capture function to calculate the input waveform information */
/* u32Count : Keep the internal counter value when input signal rising / falling */
/* happens */
/* */
/* time A B C D */
/* ___ ___ ___ ___ ___ ___ ___ ___ */
/* ____| |_| |_| |_| |_| |_| |_| |_| |_____ */
/* index 0 1 2 3 */
/* */
/* The capture internal counter down count from 0x10000, and reload to 0x10000 after */
/* input signal falling happens (Time B/C/D) */
/*--------------------------------------------------------------------------------------*/
void CalPeriodTime(PWM_T *PWM, uint32_t u32Ch)
{
uint16_t u32Count;
uint32_t u32i;
uint16_t u16RisingTime, u16FallingTime, u16HighPeriod, u16LowPeriod, u16TotalPeriod;
/* Clear Capture Falling Indicator (Time A) */
PWM_ClearCaptureIntFlag(PWM, u32Ch, PWM_CAPTURE_INT_FALLING_LATCH);
/* Wait for Capture Falling Indicator*/
while(PWM_GetCaptureIntFlag(PWM, u32Ch) < 2);
/* Clear Capture Falling Indicator (Time B)*/
PWM_ClearCaptureIntFlag(PWM, u32Ch, PWM_CAPTURE_INT_FALLING_LATCH);
u32i = 0;
while(u32i < 4)
{
/* Wait for Capture Falling Indicator */
while(PWM_GetCaptureIntFlag(PWM, u32Ch) < 2);
/* Clear Capture Falling and Rising Indicator */
PWM_ClearCaptureIntFlag(PWM, u32Ch, PWM_CAPTURE_INT_FALLING_LATCH | PWM_CAPTURE_INT_RISING_LATCH);
/* Get Capture Falling Latch Counter Data */
u32Count = PWM_GET_CAPTURE_FALLING_DATA(PWM, u32Ch);
/* Wait for Capture Rising Indicator */
while(PWM_GetCaptureIntFlag(PWM, u32Ch) < 1);
/* Clear Capture Rising Indicator */
PWM_ClearCaptureIntFlag(PWM, u32Ch, PWM_CAPTURE_INT_RISING_LATCH);
/* Get Capture Rising Latch Counter Data */
u32Count = PWM_GET_CAPTURE_RISING_DATA(PWM, u32Ch);
}
u16RisingTime = u32Count;
u16FallingTime = u32Count;
u16HighPeriod = u32Count - u32Count;
u16LowPeriod = 0x10000 - u32Count;
u16TotalPeriod = 0x10000 - u32Count;
printf("\nPWM generate: \nHigh Period=7199 ~ 7201, Low Period=16799 ~ 16801, Total Period=23999 ~ 24001\n");
printf("\nCapture Result: Rising Time = %d, Falling Time = %d \nHigh Period = %d, Low Period = %d, Total Period = %d.\n\n",
u16RisingTime, u16FallingTime, u16HighPeriod, u16LowPeriod, u16TotalPeriod);
if((u16HighPeriod < 7199) || (u16HighPeriod > 7201) || (u16LowPeriod < 16799) || (u16LowPeriod > 16801) || (u16TotalPeriod < 23999) || (u16TotalPeriod > 24001))
printf("Capture Test Fail!!\n");
else
printf("Capture Test Pass!!\n");
}
void SYS_Init(void)
{
/*---------------------------------------------------------------------------------------------------------*/
/* Init System Clock */
/*---------------------------------------------------------------------------------------------------------*/
/* Enable Internal RC clock */
CLK_EnableXtalRC(CLK_PWRCON_OSC22M_EN_Msk);
/* Waiting for IRC22M clock ready */
CLK_WaitClockReady(CLK_CLKSTATUS_OSC22M_STB_Msk);
/* Switch HCLK clock source to Internal RC and HCLK source divide 1 */
CLK_SetHCLK(CLK_CLKSEL0_HCLK_S_HIRC, CLK_CLKDIV_HCLK(1));
/* Enable XT1_OUT(PF.0) and XT1_IN(PF.1) */
SYS->GPF_MFP &= ~(SYS_GPF_MFP_PF0_Msk | SYS_GPF_MFP_PF1_Msk);
SYS->GPF_MFP |= SYS_GPF_MFP_PF0_XT1_OUT | SYS_GPF_MFP_PF1_XT1_IN;
/* Enable external 12MHz XTAL, internal 22.1184MHz */
CLK_EnableXtalRC(CLK_PWRCON_XTL12M_EN_Msk | CLK_PWRCON_OSC22M_EN_Msk);
/* Enable PLL and Set PLL frequency */
CLK_SetCoreClock(PLL_CLOCK);
/* Waiting for clock ready */
CLK_WaitClockReady(CLK_CLKSTATUS_PLL_STB_Msk | CLK_CLKSTATUS_XTL12M_STB_Msk | CLK_CLKSTATUS_OSC22M_STB_Msk);
/* Switch HCLK clock source to PLL, STCLK to HCLK/2 */
CLK_SetHCLK(CLK_CLKSEL0_HCLK_S_PLL, CLK_CLKDIV_HCLK(2));
/* Enable UART module clock */
CLK_EnableModuleClock(UART0_MODULE);
/* Enable PWM module clock */
CLK_EnableModuleClock(PWM01_MODULE);
CLK_EnableModuleClock(PWM23_MODULE);
/* Select UART module clock source */
CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART_S_HXT, CLK_CLKDIV_UART(1));
/* Select PWM module clock source */
CLK_SetModuleClock(PWM01_MODULE, CLK_CLKSEL1_PWM01_S_HXT | CLK_CLKSEL2_PWM01_EXT_HXT, 0);
CLK_SetModuleClock(PWM23_MODULE, CLK_CLKSEL1_PWM23_S_HXT | CLK_CLKSEL2_PWM23_EXT_HXT, 0);
/* User can select PWM module clock source from LIRC as below */
//CLK_SetModuleClock(PWM01_MODULE, CLK_CLKSEL1_PWM01_S_LIRC | CLK_CLKSEL2_PWM01_EXT_LIRC, 0);
//CLK_SetModuleClock(PWM23_MODULE, CLK_CLKSEL1_PWM23_S_LIRC | CLK_CLKSEL2_PWM23_EXT_LIRC, 0);
/* Reset PWMA channel0~channel3 */
SYS_ResetModule(PWM03_RST);
/* Update System Core Clock */
/* User can use SystemCoreClockUpdate() to calculate PllClock, SystemCoreClock and CycylesPerUs automatically. */
//SystemCoreClockUpdate();
PllClock = PLL_CLOCK; // PLL
SystemCoreClock = PLL_CLOCK / 1; // HCLK
CyclesPerUs = PLL_CLOCK / 1000000;// For SYS_SysTickDelay()
/*---------------------------------------------------------------------------------------------------------*/
/* Init I/O Multi-function */
/*---------------------------------------------------------------------------------------------------------*/
/* Set GPB multi-function pins for UART0 RXD and TXD */
SYS->GPB_MFP &= ~(SYS_GPB_MFP_PB0_Msk | SYS_GPB_MFP_PB1_Msk);
SYS->GPB_MFP |= (SYS_GPB_MFP_PB0_UART0_RXD | SYS_GPB_MFP_PB1_UART0_TXD);
/* Set GPA multi-function pins for PWMA Channel 0 and Channel 1 */
SYS->GPA_MFP &= ~(SYS_GPA_MFP_PA12_Msk | SYS_GPA_MFP_PA13_Msk);
SYS->GPA_MFP |= SYS_GPA_MFP_PA12_PWM0 | SYS_GPA_MFP_PA13_PWM1;
}
void UART0_Init()
{
/*---------------------------------------------------------------------------------------------------------*/
/* Init UART */
/*---------------------------------------------------------------------------------------------------------*/
/* Reset IP */
SYS_ResetModule(UART0_RST);
/* Configure UART0 and set UART0 Baudrate */
UART_Open(UART0, 115200);
}
/*---------------------------------------------------------------------------------------------------------*/
/*Main Function */
/*---------------------------------------------------------------------------------------------------------*/
int32_t main(void)
{
/* Init System, IP clock and multi-function I/O
In the end of SYS_Init() will issue SYS_LockReg()
to lock protected register. If user want to write
protected register, please issue SYS_UnlockReg()
to unlock protected register if necessary */
/* Unlock protected registers */
SYS_UnlockReg();
/* Init System, IP clock and multi-function I/O */
SYS_Init();
/* Lock protected registers */
SYS_LockReg();
/* Init UART0 for printf */
UART0_Init();
printf("+------------------------------------------------------------------------+\n");
printf("| PWM Driver Sample Code |\n");
printf("| |\n");
printf("+------------------------------------------------------------------------+\n");
printf("This sample code will use PWMA channel 0 to capture\nthe signal from PWMA channel 1.\n");
printf("I/O configuration:\n");
printf(" PWM0(PA.12 PWMA channel 0) <--> PWM1(PA.13 PWMA channel 1)\n\n");
printf("Use PWMA Channel 0(PA.12) to capture the PWMA Channel 1(PA.13) Waveform\n");
while(1)
{
printf("Press any key to start PWM Capture Test\n");
getchar();
/*--------------------------------------------------------------------------------------*/
/* Set the PWMA Channel 1 as PWM output function. */
/*--------------------------------------------------------------------------------------*/
/* Assume PWM output frequency is 250Hz and duty ratio is 30%, user can calculate PWM settings by follows.
duty ratio = (CMR+1)/(CNR+1)
cycle time = CNR+1
High level = CMR+1
PWM clock source frequency = __HXT = 12000000
(CNR+1) = PWM clock source frequency/prescaler/clock source divider/PWM output frequency
= 12000000/2/1/250 = 24000
(Note: CNR is 16 bits, so if calculated value is larger than 65536, user should increase prescale value.)
CNR = 23999
duty ratio = 30% ==> (CMR+1)/(CNR+1) = 30%
CMR = 7199
Prescale value is 1 : prescaler= 2
Clock divider is PWM_CSR_DIV1 : clock divider =1
*/
/* set PWMS channel 1 output configuration */
PWM_ConfigOutputChannel(PWMA, PWM_CH1, 250, 30);
/* Enable PWM Output path for PWMA channel 1 */
PWM_EnableOutput(PWMA, 0x2);
/* Enable Timer for PWMA channel 1 */
PWM_Start(PWMA, 0x2);
/*--------------------------------------------------------------------------------------*/
/* Set the PWMA channel 0 for capture function */
/*--------------------------------------------------------------------------------------*/
/* If input minimum frequency is 250Hz, user can calculate capture settings by follows.
Capture clock source frequency = __HXT = 12000000 in the sample code.
(CNR+1) = Capture clock source frequency/prescaler/clock source divider/minimum input frequency
= 12000000/2/1/250 = 24000
(Note: CNR is 16 bits, so if calculated value is larger than 65536, user should increase prescale value.)
CNR = 0xFFFF
(Note: In capture mode, user should set CNR to 0xFFFF to increase capture frequency range.)
*/
/* set PWMA channel 0 capture configuration */
PWM_ConfigCaptureChannel(PWMA, PWM_CH0, 166, 0);
/* Enable capture falling edge interrupt for PWMA channel 0 */
PWM_EnableCaptureInt(PWMA, PWM_CH0, PWM_CAPTURE_INT_FALLING_LATCH);
/* Enable PWMA NVIC interrupt */
NVIC_EnableIRQ((IRQn_Type)(PWMA_IRQn));
/* Enable Timer for PWMA channel 0*/
PWM_Start(PWMA, 0x1);
/* Enable Capture Function for PWMA channel 0 */
PWM_EnableCapture(PWMA, 0x1);
/* Wait until PWMA channel 0 Timer start to count */
while(PWMA->PDR0 == 0);
/* Capture the Input Waveform Data */
CalPeriodTime(PWMA, PWM_CH0);
/*------------------------------------------------------------------------------------------------------*/
/* Stop PWMA channel 1 (Recommended procedure method 1) */
/* Set PWM Timer loaded value(CNR) as 0. When PWM internal counter(PDR) reaches to 0, disable PWM Timer */
/*------------------------------------------------------------------------------------------------------*/
/* Set PWMA channel 1 loaded value as 0 */
PWM_Stop(PWMA, 0x2);
/* Wait until PWMA channel 1 Timer Stop */
while(PWMA->PDR1 != 0);
/* Disable Timer for PWMA channel 1 */
PWM_ForceStop(PWMA, 0x2);
/* Disable PWM Output path for PWMA channel 1 */
PWM_DisableOutput(PWMA, 0x2);
/*------------------------------------------------------------------------------------------------------*/
/* Stop PWMA channel 0 (Recommended procedure method 1) */
/* Set PWM Timer loaded value(CNR) as 0. When PWM internal counter(PDR) reaches to 0, disable PWM Timer */
/*------------------------------------------------------------------------------------------------------*/
/* Disable PWMA NVIC */
NVIC_DisableIRQ((IRQn_Type)(PWMA_IRQn));
/* Set loaded value as 0 for PWMA channel 0 */
PWM_Stop(PWMA, 0x1);
/* Wait until PWMA channel 0 current counter reach to 0 */
while(PWMA->PDR0 != 0);
/* Disable Timer for PWMA channel 0 */
PWM_ForceStop(PWMA, 0x1);
/* Disable Capture Function and Capture Input path forPWMA channel 0*/
PWM_DisableCapture(PWMA, 0x1);
/* Clear Capture Interrupt flag for PWMA channel 0*/
PWM_ClearCaptureIntFlag(PWMA, PWM_CH0, PWM_CAPTURE_INT_FALLING_LATCH);
}
}
捕获功能你会使用吗 gaoyang9992006 发表于 2022-12-24 17:30
捕获功能你会使用吗
会了会了，其实咱们国产的MCU我发现还是标准函数库用的多，现在STM32都推出HAL库了，但最终还是标准库比较稳定，接受起来更容易 楼主程序简洁明了，学习到了 hal库已经出来了，慢慢会向这个转的吧 主要要理解捕获的实现方法，到底在捕什么。
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