STC15单片机利用PCA捕获功能测量脉宽应用示例
Posted perseverance52
tags:
篇首语:本文由小常识网(cha138.com)小编为大家整理,主要介绍了STC15单片机利用PCA捕获功能测量脉宽应用示例相关的知识,希望对你有一定的参考价值。
STC15单片机利用PCA捕获功能测量脉宽应用示例
- 本实验室使用的芯片是
STC15F2K60S2
,晶振频率:11.0592MHz - 自制开发板《【开源STC15开发板】STC15F2K60S2开发板》
- 逻辑分析仪采集的数据
- 静态数据测量
占空比是50%,周期:65.022ms,
- 串口输出
》 串口打印的脉冲计数值是6000,
实验代码(main主程序代码)
#include "config.h"
#include "timer.h"
#include "USART.h"
#include "PCA.h"
#include <stdio.h> // 为使用KEIL自带的库函数printf而加入
/************* 功能说明 **************
P26为捕捉. 可以连接到P2.7用来测试捕捉,捕捉的时间从串口1输出. 也可以从外部输入一个信号来捕捉.
PCA2 为16位软件定时, 定时时间为30000个PCA时钟, 并且从P2.7高速输出信号,输出周期为60000个PCA时钟.
P2.7可以连接到P2.6用来测试捕捉,捕捉的时间从串口1输出.
串口1把收到的数据原样返回.做了printf重映射来输出
串口2未启用
定时器0产生1ms的基准,作为程序运行的节拍.
******************************************/
/************* 本地常量声明 **************/
/************* 本地变量声明 **************/
u8 cnt0;
u16 Cap_time; //上一次捕捉时间
u8 pwm0; //pwm
bit B_PWM0_Dir; //方向, 0为+, 1为-.
/************* 本地函数声明 **************/
/************* 外部函数和变量声明 *****************/
extern bit B_Timer0_1ms;
void Timer_config(void)
TIM_InitTypeDef TIM_InitStructure; //结构定义
TIM_InitStructure.TIM_Mode = TIM_16BitAutoReload; //指定工作模式, TIM_16BitAutoReload,TIM_16Bit,TIM_8BitAutoReload,TIM_16BitAutoReloadNoMask
TIM_InitStructure.TIM_Polity = PolityLow; //指定中断优先级, PolityHigh,PolityLow
TIM_InitStructure.TIM_Interrupt = ENABLE; //中断是否允许, ENABLE或DISABLE
TIM_InitStructure.TIM_ClkSource = TIM_CLOCK_12T; //指定时钟源, TIM_CLOCK_1T,TIM_CLOCK_12T,TIM_CLOCK_Ext
TIM_InitStructure.TIM_ClkOut = DISABLE; //是否输出高速脉冲, ENABLE或DISABLE
TIM_InitStructure.TIM_Value = 65536UL - ((1000 * MAIN_Fosc) / 12000); //初值, 1000us
TIM_InitStructure.TIM_Run = ENABLE; //是否初始化后启动定时器, ENABLE或DISABLE
Timer_Inilize(Timer0,&TIM_InitStructure); //初始化Timer0 Timer0,Timer1,Timer2
void UART_config(void)
COMx_InitDefine COMx_InitStructure; //结构定义
COMx_InitStructure.UART_Mode = UART_8bit_BRTx; //模式, UART_ShiftRight,UART_8bit_BRTx,UART_9bit,UART_9bit_BRTx
COMx_InitStructure.UART_BRT_Use = BRT_Timer1; //使用波特率, BRT_Timer1, BRT_Timer2 (注意: 串口2固定使用BRT_Timer2)
COMx_InitStructure.UART_BaudRate = 115200ul; //波特率, 一般 110 ~ 115200
COMx_InitStructure.UART_RxEnable = ENABLE; //接收允许, ENABLE或DISABLE
COMx_InitStructure.BaudRateDouble = DISABLE; //波特率加倍, ENABLE或DISABLE
COMx_InitStructure.UART_Interrupt = ENABLE; //中断允许, ENABLE或DISABLE
COMx_InitStructure.UART_Polity = PolityLow; //中断优先级, PolityLow,PolityHigh
COMx_InitStructure.UART_P_SW = UART1_SW_P30_P31; //切换端口, UART1_SW_P30_P31,UART1_SW_P36_P37,UART1_SW_P16_P17(必须使用内部时钟)
COMx_InitStructure.UART_RXD_TXD_Short = DISABLE; //内部短路RXD与TXD, 做中继, ENABLE,DISABLE
USART_Configuration(USART1, &COMx_InitStructure); //初始化串口1 USART1,USART2
// COMx_InitStructure.UART_Mode = UART_8bit_BRTx; //模式, UART_ShiftRight,UART_8bit_BRTx,UART_9bit,UART_9bit_BRTx
// COMx_InitStructure.UART_BaudRate = 57600ul; //波特率, 110 ~ 115200
// COMx_InitStructure.UART_RxEnable = ENABLE; //接收允许, ENABLE或DISABLE
// COMx_InitStructure.UART_Interrupt = ENABLE; //中断允许, ENABLE或DISABLE
// COMx_InitStructure.UART_Polity = PolityLow; //中断优先级, PolityLow,PolityHigh
// COMx_InitStructure.UART_P_SW = UART2_SW_P10_P11; //切换端口, UART2_SW_P10_P11,UART2_SW_P46_P47
// USART_Configuration(USART2, &COMx_InitStructure); //初始化串口2 USART1,USART2
printf("STC15F2K60S2 PCA Test Prgramme from SUART1!\\r\\n");//SUART1发送一个字符串
// PrintString1("STC15F2K60S2 PCA Test Prgramme from SUART1!\\r\\n"); //SUART1发送一个字符串
// PrintString2("STC15F2K60S2 PCA Test Prgramme from SUART2!\\r\\n"); //SUART2发送一个字符串
void PCA_config(void)
PCA_InitTypeDef PCA_InitStructure;
PCA_InitStructure.PCA_Clock = PCA_Clock_12T; //PCA_Clock_1T, PCA_Clock_2T, PCA_Clock_4T, PCA_Clock_6T, PCA_Clock_8T, PCA_Clock_12T, PCA_Clock_Timer0_OF, PCA_Clock_ECI
PCA_InitStructure.PCA_IoUse = PCA_P24_P25_P26_P27; //PCA_P12_P11_P10_P37, PCA_P34_P35_P36_P37, PCA_P24_P25_P26_P27
PCA_InitStructure.PCA_Interrupt_Mode = DISABLE; //ENABLE, DISABLE
PCA_InitStructure.PCA_Polity = PolityHigh; //优先级设置 PolityHigh,PolityLow
PCA_InitStructure.PCA_RUN = DISABLE; //ENABLE, DISABLE
PCA_Init(PCA_Counter,&PCA_InitStructure);
PCA_InitStructure.PCA_Mode = PCA_Mode_PWM; //PCA_Mode_PWM, PCA_Mode_Capture, PCA_Mode_SoftTimer, PCA_Mode_HighPulseOutput
PCA_InitStructure.PCA_PWM_Wide = PCA_PWM_8bit; //PCA_PWM_8bit, PCA_PWM_7bit, PCA_PWM_6bit
PCA_InitStructure.PCA_Interrupt_Mode = DISABLE; //PCA_Rise_Active, PCA_Fall_Active, ENABLE, DISABLE
PCA_InitStructure.PCA_Value = 128 << 8; //对于PWM,高8位为PWM占空比50%
PCA_Init(PCA0,&PCA_InitStructure);
PCA_InitStructure.PCA_Mode = PCA_Mode_Capture; //PCA_Mode_PWM, PCA_Mode_Capture, PCA_Mode_SoftTimer, PCA_Mode_HighPulseOutput
PCA_InitStructure.PCA_PWM_Wide = 0; //PCA_PWM_8bit, PCA_PWM_7bit, PCA_PWM_6bit
PCA_InitStructure.PCA_Interrupt_Mode = PCA_Fall_Active | ENABLE; //(PCA_Rise_Active, PCA_Fall_Active) or (ENABLE, DISABLE)
PCA_InitStructure.PCA_Value = 0; //对于捕捉, 这个值没意义
PCA_Init(PCA1,&PCA_InitStructure);
PCA_InitStructure.PCA_Mode = PCA_Mode_HighPulseOutput; //PCA_Mode_PWM, PCA_Mode_Capture, PCA_Mode_SoftTimer, PCA_Mode_HighPulseOutput
PCA_InitStructure.PCA_PWM_Wide = PCA_PWM_8bit; //PCA_PWM_8bit, PCA_PWM_7bit, PCA_PWM_6bit
PCA_InitStructure.PCA_Interrupt_Mode = ENABLE; //PCA_Rise_Active, PCA_Fall_Active, ENABLE, DISABLE
PCA_InitStructure.PCA_Value = 30000; //对于软件定时, 为匹配比较值
PCA_Init(PCA2,&PCA_InitStructure);
CR = 1;
/******************** task A **************************/
void main(void)
u8 i;
u32 j;
Timer_config();
UART_config();
PCA_config();
EA = 1;
Cap_time = 0;
pwm0 = 128;
B_PWM0_Dir = 0;
while (1)
if(B_Timer0_1ms)
B_Timer0_1ms = 0;
if(B_Capture1)
B_Capture1 = 0;
j = CCAP1_tmp - Cap_time; //计算时间差
Cap_time = CCAP1_tmp;
printf("PCA_PULSE: %lu \\r\\n",j);
// TX1_write2buff(j/10000 + '0');
// TX1_write2buff(j%10000/1000 + '0');
// TX1_write2buff(j%1000/100 + '0');
// TX1_write2buff(j%100/10 + '0');
// TX1_write2buff(j%10 + '0');
// PrintString1("\\r\\n");
cnt0++;
if((cnt0 & 15) == 15) //16ms
if(B_PWM0_Dir)
if(--pwm0 <= 8) B_PWM0_Dir = 0;
else if(++pwm0 >= 248) B_PWM0_Dir = 1;
UpdatePwm(PCA0,pwm0);
if(COM1.RX_TimeOut > 0) //超时计数
if(--COM1.RX_TimeOut == 0)
if(COM1.RX_Cnt > 0)
for(i=0; i<COM1.RX_Cnt; i++) TX1_write2buff(RX1_Buffer[i]); //收到的数据原样返回
COM1.RX_Cnt = 0;
if(COM2.RX_TimeOut > 0) //超时计数
if(--COM2.RX_TimeOut == 0)
if(COM2.RX_Cnt > 0)
for(i=0; i<COM2.RX_Cnt; i++) TX2_write2buff(RX2_Buffer[i]); //收到的数据原样返回
COM2.RX_Cnt = 0;
实验源代码
链接:https://pan.baidu.com/s/1fowtm2hU8OKjOROKW4qvtA
提取码:6wjq
2022深度学习开发者峰会
5月20日13:00让我们相聚云端,共襄盛会!
以上是关于STC15单片机利用PCA捕获功能测量脉宽应用示例的主要内容,如果未能解决你的问题,请参考以下文章
11.STC15W408AS单片机CCP/PCA/PWM应用
11.STC15W408AS单片机CCP/PCA/PWM应用
11.STC15W408AS单片机CCP/PCA/PWM应用