本帖最后由 IoTCatcher 于 2018-12-4 17:50 编辑
1. 首先, 我想吐槽下你这个图片为什么不是截图, 你这么搞看的人很难受.
2. 其次, 我觉得像楼主这种问题, 不算特别复杂, 官网提供的样例代码跑一下应该就可以.
3. 最后, 以下代码拷贝自官方样例代码:
<pre style="color: rgb(0, 0, 0); white-space: pre-wrap;">/**************************************************************************//**
* [url=home.php?mod=space&uid=288409]@file[/url] main.c
* [url=home.php?mod=space&uid=895143]@version[/url] V1.00
* $Revision: 5 $
* $Date: 15/01/15 1:34p $
* [url=home.php?mod=space&uid=247401]@brief[/url] Change duty cycle and period of output waveform by BPWM Double Buffer function.
* @note
* Copyright (C) 2014 Nuvoton Technology Corp. All rights reserved.
*
******************************************************************************/
#include <stdio.h>
#include "NUC131.h"
/*---------------------------------------------------------------------------------------------------------*/
/* Macro, type and constant definitions */
/*---------------------------------------------------------------------------------------------------------*/
#define PLLCON_SETTING CLK_PLLCON_50MHz_HXT
#define PLL_CLOCK 50000000
/*---------------------------------------------------------------------------------------------------------*/
/* Global variables */
/*---------------------------------------------------------------------------------------------------------*/
/**
* @brief BPWM0 IRQ Handler
*
* @param None
*
* [url=home.php?mod=space&uid=266161]@return[/url] None
*
* [url=home.php?mod=space&uid=1543424]@Details[/url] ISR to handle BPWM0 interrupt event
*/
void BPWM0_IRQHandler(void)
{
static int toggle = 0;
// Update BPWM0 channel 0 period and duty
if(toggle == 0)
{
BPWM_SET_CNR(BPWM0, 0, 99);
BPWM_SET_CMR(BPWM0, 0, 39);
}
else
{
BPWM_SET_CNR(BPWM0, 0, 399);
BPWM_SET_CMR(BPWM0, 0, 199);
}
toggle ^= 1;
// Clear channel 0 period interrupt flag
BPWM_ClearPeriodIntFlag(BPWM0, 0);
}
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 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);
/* Select UART module clock source */
CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART_S_HXT, CLK_CLKDIV_UART(1));
/* Enable BPWM0 clock source */
CLK_EnableModuleClock(BPWM0_MODULE);
/* Select BPWM module clock source */
//CLK_SetModuleClock(BPWM0_MODULE, CLK_CLKSEL3_BPWM0_S_HClK, 0);
CLK_SetModuleClock(BPWM0_MODULE, CLK_CLKSEL3_BPWM0_S_PLL, 0);
/* Reset BPWM0 */
SYS_ResetModule(BPWM0_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 GPC multi-function pins for BPWM0 Channel 0 */
SYS->GPC_MFP &= ~(SYS_GPC_MFP_PC0_Msk);
SYS->GPC_MFP |= SYS_GPC_MFP_PC0_BPWM0_CH0;
SYS->ALT_MFP3 &= ~(SYS_ALT_MFP3_PC0_Msk);
SYS->ALT_MFP3 |= SYS_ALT_MFP3_PC0_BPWM0_CH0;
}
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)
{
/* Unlock protected registers */
SYS_UnlockReg();
/* Init System, IP clock and multi-function I/O */
SYS_Init();
/* Lock protected registers */
SYS_LockReg();
/* Init UART to 115200-8n1 for print message */
UART0_Init();
printf("+------------------------------------------------------------------------+\n");
printf("| BPWM Driver Sample Code |\n");
printf("| |\n");
printf("+------------------------------------------------------------------------+\n");
printf(" This sample code will use BPWM0 channel 0 to output waveform\n");
printf(" I/O configuration:\n");
printf(" waveform output pin: BPWM0 channel 0(PC.0)\n");
printf("\nUse double buffer feature.\n");
/*
BPWM0 channel 0 waveform of this sample shown below:
|<- CNR + 1 clk ->| CNR + 1 = 399 + 1 CLKs
|<-CMR+1 clk ->| CMR + 1 = 199 + 1 CLKs
|<- CNR + 1 ->| CNR + 1 = 99 + 1 CLKs
|<CMR+1>| CMR + 1 = 39 + 1 CLKs
__ ______________ _______
|______200_____| 200 |____60__| 40 |_____BPWM waveform
*/
/*
Configure BPWM0 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%
*/
// BPWM0 channel 0 frequency is 100Hz, duty 30%,
BPWM_ConfigOutputChannel(BPWM0, 0, 30000, 30);
// Enable output of BPWM0 channel 0
BPWM_EnableOutput(BPWM0, BPWM_CH_0_MASK);
// Enable BPWM0 channel 0 period interrupt, use channel 0 to measure time.
BPWM_EnablePeriodInt(BPWM0, 0, 0);
NVIC_EnableIRQ(BPWM0_IRQn);
// Start
BPWM_Start(BPWM0, BPWM_CH_0_MASK);
while(1);
}
</pre><pre style="color: rgb(0, 0, 0); white-space: pre-wrap;">
</pre><pre style="color: rgb(0, 0, 0); white-space: pre-wrap;"><pre style="white-space: pre-wrap;">/**************************************************************************//**
* @file main.c
* @version V1.00
* $Revision: 4 $
* $Date: 15/01/15 1:34p $
* @brief Capture the BPWM1 Channel 0 waveform by BPWM0 Channel 0.
* @note
* Copyright (C) 2014 Nuvoton Technology Corp. All rights reserved.
*
******************************************************************************/
#include <stdio.h>
#include "NUC131.h"
/*---------------------------------------------------------------------------------------------------------*/
/* Macro, type and constant definitions */
/*---------------------------------------------------------------------------------------------------------*/
#define PLLCON_SETTING CLK_PLLCON_50MHz_HXT
#define PLL_CLOCK 50000000
/*---------------------------------------------------------------------------------------------------------*/
/* Global variables */
/*---------------------------------------------------------------------------------------------------------*/
/**
* @brief BPWM0 IRQ Handler
*
* @param None
*
* @return None
*
* @details ISR to handle BPWM0 interrupt event
*/
void BPWM0_IRQHandler(void)
{
if(BPWM_GetCaptureIntFlag(BPWM0, 0) > 1)
{
BPWM_ClearCaptureIntFlag(BPWM0, 0, BPWM_CAPTURE_INT_FALLING_LATCH);
}
}
/*--------------------------------------------------------------------------------------*/
/* Capture function to calculate the input waveform information */
/* u32Count[4] : 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(BPWM_T *BPWM, uint32_t u32Ch)
{
uint16_t u32Count[4];
uint32_t u32i;
uint16_t u16RisingTime, u16FallingTime, u16HighPeroid, u16LowPeroid, u16TotalPeroid;
/* Clear Capture Falling Indicator (Time A) */
BPWM_ClearCaptureIntFlag(BPWM, u32Ch, BPWM_CAPTURE_INT_FALLING_LATCH | BPWM_CAPTURE_INT_RISING_LATCH);
/* Wait for Capture Falling Indicator */
while(BPWM_GetCaptureIntFlag(BPWM, u32Ch) < 2);
/* Clear Capture Falling Indicator (Time B)*/
BPWM_ClearCaptureIntFlag(BPWM, u32Ch, BPWM_CAPTURE_INT_FALLING_LATCH);
u32i = 0;
while(u32i < 4)
{
/* Wait for Capture Falling Indicator */
while(BPWM_GetCaptureIntFlag(BPWM, u32Ch) < 2);
/* Clear Capture Falling and Rising Indicator */
BPWM_ClearCaptureIntFlag(BPWM, u32Ch, BPWM_CAPTURE_INT_FALLING_LATCH | BPWM_CAPTURE_INT_RISING_LATCH);
/* Get Capture Falling Latch Counter Data */
u32Count[u32i++] = BPWM_GET_CAPTURE_FALLING_DATA(BPWM, u32Ch);
/* Wait for Capture Rising Indicator */
while(BPWM_GetCaptureIntFlag(BPWM, u32Ch) < 1);
/* Clear Capture Rising Indicator */
BPWM_ClearCaptureIntFlag(BPWM, u32Ch, BPWM_CAPTURE_INT_RISING_LATCH);
/* Get Capture Rising Latch Counter Data */
u32Count[u32i++] = BPWM_GET_CAPTURE_RISING_DATA(BPWM, u32Ch);
}
u16RisingTime = u32Count[1];
u16FallingTime = u32Count[0];
u16HighPeroid = u32Count[1] - u32Count[2];
u16LowPeroid = 0x10000 - u32Count[1];
u16TotalPeroid = 0x10000 - u32Count[2];
printf("\nBPWM 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, u16HighPeroid, u16LowPeroid, u16TotalPeroid);
if((u16HighPeroid < 7199) || (u16HighPeroid > 7201) || (u16LowPeroid < 16799) || (u16LowPeroid > 16801) || (u16TotalPeroid < 23999) || (u16TotalPeroid > 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 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));
CLK_SetHCLK(CLK_CLKSEL0_HCLK_S_HXT, CLK_CLKDIV_HCLK(1));
/* Enable UART module clock */
CLK_EnableModuleClock(UART0_MODULE);
/* Enable BPWM module clock */
CLK_EnableModuleClock(BPWM0_MODULE);
CLK_EnableModuleClock(BPWM1_MODULE);
/* Select UART module clock source */
CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART_S_HXT, CLK_CLKDIV_UART(1));
/* Select BPWM module clock source */
CLK_SetModuleClock(BPWM0_MODULE, CLK_CLKSEL3_BPWM0_S_PCLK, 0);
CLK_SetModuleClock(BPWM1_MODULE, CLK_CLKSEL3_BPWM1_S_PCLK, 0);
/* Reset BPWM0 and BPWM1 */
SYS_ResetModule(BPWM0_RST);
SYS_ResetModule(BPWM1_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 GPC and GPD multi-function pins for BPWM0 Channel 0 and BPWM1 channel 0 */
SYS->GPC_MFP &= ~(SYS_GPC_MFP_PC0_Msk);
SYS->GPC_MFP |= SYS_GPC_MFP_PC0_BPWM0_CH0;
SYS->ALT_MFP3 &= ~(SYS_ALT_MFP3_PC0_Msk);
SYS->ALT_MFP3 |= SYS_ALT_MFP3_PC0_BPWM0_CH0;
SYS->GPD_MFP &= ~(SYS_GPD_MFP_PD7_Msk);
SYS->GPD_MFP |= SYS_GPD_MFP_PD7_BPWM1_CH0;
SYS->ALT_MFP3 &= ~(SYS_ALT_MFP3_PD7_Msk);
SYS->ALT_MFP3 |= SYS_ALT_MFP3_PD7_BPWM1_CH0;
}
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)
{
/* 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("| BPWM Driver Sample Code |\n");
printf("| |\n");
printf("+------------------------------------------------------------------------+\n");
printf(" This sample code will use BPWM0 channel 0 to capture\n the signal from BPWM1 channel 0.\n");
printf(" I/O configuration:\n");
printf(" BPWM0_CH0(PC.0 BPWM0 channel 0) <--> BPWM1_CH0(PD.7 BPWM1 channel 0)\n\n");
printf("Use BPWM0 Channel 0(PC.0) to capture the BPWM1 Channel 0(PD.7) Waveform\n");
while(1)
{
printf("Press any key to start BPWM Capture Test\n");
getchar();
/*--------------------------------------------------------------------------------------*/
/* Set the BPWM1 Channel 0 as BPWM output function. */
/*--------------------------------------------------------------------------------------*/
/* Assume BPWM output frequency is 250Hz and duty ratio is 30%, user can calculate BPWM settings by follows.
duty ratio = (CMR+1)/(CNR+1)
cycle time = CNR+1
High level = CMR+1
BPWM clock source frequency = __HXT = 12000000
(CNR+1) = BPWM clock source frequency/prescaler/clock source divider/BPWM 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 BPWM_CSR_DIV1 : clock divider =1
*/
/* set BPWM1 channel 0 output configuration */
BPWM_ConfigOutputChannel(BPWM1, 0, 250, 30);
/* Enable BPWM Output path for BPWM1 channel 0 */
BPWM_EnableOutput(BPWM1, BPWM_CH_0_MASK);
/* Enable Timer for BPWM1 channel 0 */
BPWM_Start(BPWM1, BPWM_CH_0_MASK);
/*--------------------------------------------------------------------------------------*/
/* Set the BPWM0 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 BPWM0 channel 0 capture configuration */
BPWM_ConfigCaptureChannel(BPWM0, 0, 166, 0);
/* Enable capture falling edge interrupt for BPWM0 channel 0 */
//BPWM_EnableCaptureInt(BPWM0, 0, BPWM_CAPTURE_INT_FALLING_LATCH);
/* Enable BPWM0 NVIC interrupt */
//NVIC_EnableIRQ(BPWM0_IRQn);
/* Enable Timer for BPWM0 channel 0 */
BPWM_Start(BPWM0, BPWM_CH_0_MASK);
/* Enable Capture Function for BPWM0 channel 0 */
BPWM_EnableCapture(BPWM0, BPWM_CH_0_MASK);
/* Enable falling capture reload */
BPWM0->CAPCTL |= BPWM_CAPCTL_FCRLDEN0_Msk;
/* Wait until BPWM0 channel 0 Timer start to count */
while((BPWM0->CNT) == 0);
/* Capture the Input Waveform Data */
CalPeriodTime(BPWM0, 0);
/*---------------------------------------------------------------------------------------------------------*/
/* Stop BPWM1 channel 0 (Recommended procedure method 1) */
/* Set BPWM Timer loaded value(Period) as 0. When BPWM internal counter(CNT) reaches to 0, disable BPWM Timer */
/*---------------------------------------------------------------------------------------------------------*/
/* Set BPWM1 channel 0 loaded value as 0 */
BPWM_Stop(BPWM1, BPWM_CH_0_MASK);
/* Wait until BPWM1 channel 0 Timer Stop */
while((BPWM1->CNT & BPWM_CNT_CNT_Msk) != 0);
/* Disable Timer for BPWM1 channel 0 */
BPWM_ForceStop(BPWM1, BPWM_CH_0_MASK);
/* Disable BPWM Output path for BPWM1 channel 0 */
BPWM_DisableOutput(BPWM1, BPWM_CH_0_MASK);
/*---------------------------------------------------------------------------------------------------------*/
/* Stop BPWM0 channel 0 (Recommended procedure method 1) */
/* Set BPWM Timer loaded value(Period) as 0. When BPWM internal counter(CNT) reaches to 0, disable BPWM Timer */
/*---------------------------------------------------------------------------------------------------------*/
/* Disable BPWM0 NVIC */
//NVIC_DisableIRQ(BPWM0_IRQn);
/* Set loaded value as 0 for BPWM0 channel 0 */
BPWM_Stop(BPWM0, BPWM_CH_0_MASK);
/* Wait until BPWM0 channel 0 current counter reach to 0 */
while((BPWM0->CNT & BPWM_CNT_CNT_Msk) != 0);
/* Disable Timer for BPWM0 channel 0 */
BPWM_ForceStop(BPWM0, BPWM_CH_0_MASK);
/* Disable Capture Function and Capture Input path for BPWM0 channel 0 */
BPWM_DisableCapture(BPWM0, BPWM_CH_0_MASK);
/* Clear Capture Interrupt flag for BPWM0 channel 0 */
BPWM_ClearCaptureIntFlag(BPWM0, 0, BPWM_CAPTURE_INT_FALLING_LATCH);
}
}
</pre></pre>
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