GPIO口模拟PWM输出
#define MY_PWM_NUM 2
typedef struct
{
unsigned int myPwmPeriod;
unsigned int myPwmArr;
unsigned int myPwmTime;
unsigned int myPwmStart;
unsigned int myPwmCount;
void (* function)(int value);
}my_pwm_t;
extern my_pwm_t my_pwm[MY_PWM_NUM];
void myGpioPwmInit(int timeX, int period, int arr, int start,void (* function)(int value))
{
if(timeX > MY_PWM_NUM) return;
if(arr > period) return;
my_pwm[timeX].myPwmStart = start;
my_pwm[timeX].myPwmPeriod = period;
my_pwm[timeX].myPwmArr = arr;
my_pwm[timeX].function = function;
}
void myGpioPwmRun(void)
{
for(int i = 0; i < MY_PWM_NUM; i++)
{
if(my_pwm[i].myPwmStart == 1)
{
my_pwm[i].myPwmCount++;
}
else
{
my_pwm[i].myPwmCount = 0;
}
if(my_pwm[i].myPwmCount <= my_pwm[i].myPwmArr)
{
//高电平
my_pwm[i].function(1);
}
else if(my_pwm[i].myPwmCount <= my_pwm[i].myPwmPeriod)
{
//低电平
my_pwm[i].function(0);
}
else
{
my_pwm[i].myPwmCount = 0;
}
}
}
void keyUpDownBacklight(int value)
{
if(value == 1)
{
W_GPOI1;
}
else if(value == 0)
{
W_GPOI0;
}
}
void keyStartBacklight(int value)
{
if(value == 1)
{
Y_GPOI1;
}
else if(value == 0)
{
Y_GPOI0;
}
}
#define KEYBUTTON GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_8)
int main(void)
{
Board_RCC_Config(); //时钟初始化
myGpioPwmInit(0, 10, 5, 1,keyUpDownBacklight);//0号引脚，周期10ms，占空比50%，默认开启，回调函数keyUpDownBacklight
myGpioPwmInit(1, 10, 5, 1,keyStartBacklight);
while(1)
{
myGpioPwmRun();
delay_ms(1);
if(KEYBUTTON == 0)//检测按键按下
{
key_count++;
}
else if(key_count > 50)//消抖时间50ms
{
flag = !flag;
if(flag== 1)
{
//执行按键开的逻辑
myGpioPwmInit(0, 10, 8, 1,keyUpDownBacklight);//占空比改为80%
}
else
{
//执行按键关的逻辑
myGpioPwmInit(0, 10, 2, 1,keyUpDownBacklight);//占空比改为20%
}
}
else
{
key_count = 0;
}
}
}