msp430f5529 pid代码
时间: 2023-07-31 14:08:47 浏览: 203
以下是一个简单的 MSP430F5529 控制 PID 的示例代码:
```c
#include <msp430.h>
#define LED_PIN BIT0
#define PWM_PIN BIT1
#define PERIOD 1000
#define DUTY_CYCLE 500
float Kp = 1.0;
float Ki = 0.0;
float Kd = 0.0;
float setpoint = 50.0;
float output = 0.0;
float error = 0.0;
float prev_error = 0.0;
float integral = 0.0;
float derivative = 0.0;
float dt = 0.01;
void initPWM() {
P1DIR |= PWM_PIN;
P1SEL |= PWM_PIN;
TA0CCR0 = PERIOD - 1;
TA0CCTL1 = OUTMOD_7;
TA0CCR1 = DUTY_CYCLE;
TA0CTL = TASSEL_2 + MC_1 + TACLR;
}
float computePID(float input) {
error = setpoint - input;
integral += error * dt;
derivative = (error - prev_error) / dt;
output = Kp * error + Ki * integral + Kd * derivative;
prev_error = error;
return output;
}
void main() {
WDTCTL = WDTPW + WDTHOLD;
initPWM();
while(1) {
// read sensor input
float input = 0.0; // replace with actual sensor reading
// compute PID output
float pid_output = computePID(input);
// update PWM duty cycle
TA0CCR1 = (int)(pid_output * PERIOD);
// delay for dt seconds
__delay_cycles((long)(dt * 1000000));
}
}
```
在这个例子中,我们首先定义了一些 PID 控制参数和变量,包括比例系数 Kp、积分系数 Ki、微分系数 Kd、目标值 setpoint、输出值 output、误差 error、上一次误差 prev_error、积分量 integral、微分量 derivative 和采样周期 dt。然后,我们定义了一个 computePID() 函数来计算 PID 输出值,该函数接受一个输入值 input,并返回一个输出值 output。在主函数中,我们首先初始化 PWM,然后进入一个无限循环,在每次循环中读取传感器输入值,计算 PID 输出值,更新 PWM 占空比,并延迟 dt 秒。
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