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pid update, formatting

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Imbus 2025-08-16 17:13:53 +02:00
parent 1c7d6984d0
commit c646e608a0
1 changed files with 6 additions and 16 deletions
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22
pid.c
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@ -1,6 +1,4 @@
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define BUFFER_SIZE 100
@ -8,7 +6,7 @@
typedef struct {
float Kp, Ki, Kd; // PID gains
float error_buffer[BUFFER_SIZE]; // Circular buffer for integral calculation
int buffer_index; // Current index in the buffer
int buffer_index; // Current index in the buffer
float integral_sum; // Running sum of integral terms
float prev_error; // Previous error for derivative term
float dt; // Sample time (seconds)
@ -31,22 +29,17 @@ float pid_compute(PIDController *pid, float setpoint, float pv) {
float error = setpoint - pv;
// Update integral term using circular buffer
pid->integral_sum -=
pid->error_buffer[pid->buffer_index]; // Remove oldest value
pid->error_buffer[pid->buffer_index] =
error * pid->dt; // Store new integral term
pid->integral_sum -= pid->error_buffer[pid->buffer_index]; // Remove oldest value
pid->error_buffer[pid->buffer_index] = error * pid->dt; // Store new integral term
pid->integral_sum += pid->error_buffer[pid->buffer_index]; // Add new value
// Advance circular buffer index
pid->buffer_index = (pid->buffer_index + 1) % BUFFER_SIZE;
pid->buffer_index = (pid->buffer_index + 1) % BUFFER_SIZE; // Advance circular buffer index
// Compute derivative term
float derivative = (error - pid->prev_error) / pid->dt;
pid->prev_error = error;
// Compute PID output
float output = (pid->Kp * error) + (pid->Ki * pid->integral_sum) +
(pid->Kd * derivative);
float output = (pid->Kp * error) + (pid->Ki * pid->integral_sum) + (pid->Kd * derivative);
return output;
}
@ -61,13 +54,10 @@ int main() {
for (int i = 0; i < 50; i++) {
float output = pid_compute(&pid, setpoint, pv);
printf("Iteration %d: Setpoint: %.2f, PV: %.2f, Output: %.2f\n", i,
setpoint, pv, output);
printf("Iteration %d: Setpoint: %.2f, PV: %.2f, Output: %.2f\n", i, setpoint, pv, output);
// Simulate process variable update
pv += output * 0.1f;
if (fabsf(output) < 0.4)
setpoint = 150;
}
return 0;