STM32+按键调控PWM输出+串口输出占空比

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xztelecomlcs 2013-07-10 16:08:54

文章标签 键盘技巧 include LED灯 文章分类 C/C++ 后端开发

GPIO.c

#include "STM32Lib\\stm32f10x.h"
#include "hal.h"

/*******************************************************************************
* Function Name : GPIO_Configuration
* 设置PD3,PD4,PD5,PD6为键盘输入
* 设置PB0,5,8,9; PC5,7; PD7 ;PA8 为输出LED灯
*******************************************************************************/
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;

/*允许总线CLOCK,在使用GPIO之前必须允许相应端的时钟.
从STM32的设计角度上说,没被允许的端将不接入时钟,也就不会耗能,
这是STM32节能的一种技巧,*/

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);

/* PC8按键输入*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; //上拉输入
GPIO_Init(GPIOC, &GPIO_InitStructure);

/* PC9按键输入*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; //上拉输入
GPIO_Init(GPIOC, &GPIO_InitStructure);
}

hal.h

#ifndef HAL_H
#define HAL_H

//硬件初始化
extern void ChipHalInit(void);
extern void ChipOutHalInit(void);

//输入宏定义
#define GET_LEFT() (GPIO_ReadInputDataBit(GPIOC,GPIO_Pin_8))
#define GET_RIGHT() (GPIO_ReadInputDataBit(GPIOC,GPIO_Pin_9))
extern void USART1_Putc(u8 c);
extern void USART_Configuration(void);
extern void USART1_Puts(char * str);

#endif

TIM.c

#include "STM32Lib\\stm32f10x.h"

void Tim1_Configuration(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;

GPIO_InitTypeDef GPIO_InitStructure;

/* PA8设置为功能脚(PWM) */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOA, &GPIO_InitStructure);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1,ENABLE);

TIM_DeInit(TIM1);

/*TIM1时钟配置*/
TIM_TimeBaseStructure.TIM_Prescaler = 72; //预分频(时钟分频)72M/72=1000K
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上计数
TIM_TimeBaseStructure.TIM_Period = 2000; //装载值 1000k/2000=500hz
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0x0;
TIM_TimeBaseInit(TIM1,&TIM_TimeBaseStructure);

/* Channel 1 Configuration in PWM mode */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //PWM模式2
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //正向通道有效
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Disable;//反向通道无效
TIM_OCInitStructure.TIM_Pulse = 300; //占空时间
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; //输出极性
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High; //互补端的极性
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;

TIM_OC1Init(TIM1,&TIM_OCInitStructure); //通道1

/* TIM1 counter enable */
TIM_Cmd(TIM1,ENABLE);

/* TIM1 Main Output Enable */
TIM_CtrlPWMOutputs(TIM1,ENABLE);
}

//设置捕获寄存器1
void SetT1Pwm1(u16 pulse)
{
TIM1->CCR1=pulse;
}

main.c

/************************************************************
**实验名称:PWM
**功能:是PA8产生PWM输出,按键调节占空比
*************************************************************/

#include "STM32Lib\\stm32f10x.h"
#include "hal.h"
#define SIZE 0
u8 table[11]={"0123456789 "};
char buffer[10]={"0000000000"};
void Delay(u16 n);

void d_2_char(u32 x)
{
buffer[SIZE+0]=table[x%10000000000/100000];
buffer[SIZE+1]=table[x%1000000000/100000];
buffer[SIZE+2]=table[x%100000000/100000];
buffer[SIZE+3]=table[x%10000000/10000];
buffer[SIZE+4]=table[x%1000000/10000];
buffer[SIZE+5]=table[x%100000/10000];
buffer[SIZE+6]=table[x%10000/1000];
buffer[SIZE+7]=table[x%1000/100];
buffer[SIZE+8]=table[x%100/10];
buffer[SIZE+9]=table[x%10];
}

//延迟函数
void Delay(u16 speed)
{
u16 i;
while(speed!=0)
{
speed--;
for(i=0;i<400;i++);
}
}
extern void SetT1Pwm1(u16 pulse);

int main(void)
{
u16 pulse=300;
ChipHalInit(); //片内硬件初始化
ChipOutHalInit(); //片外硬件初始化

for(;;)
{
if(GET_LEFT()==0)
{
while(GET_LEFT()==0);
if(pulse<=2000)
{
pulse+=30;
// SetT1Pwm1(pulse);
}
else
{
pulse=300;
}
d_2_char(pulse);
USART1_Puts(buffer);
USART1_Puts("\r\n");