【嵌入式】在 Keil C51 中生成库文件（`.lib`）步骤

  // core.h
#ifndef _CIRCULAR_BUFFER_H_
#define _CIRCULAR_BUFFER_H_

#ifndef NULL
#define NULL ((void*)0)
#endif

// Structure to manage circular buffer data
typedef struct {
    unsigned int*       buffer;     // Pointer to dynamically allocated buffer storage
    unsigned long int   sum;        // Sum of all values in the buffer
    unsigned char       index;      // Index of the oldest value to be replaced
    unsigned char       count;      // Number of values currently stored (max: BUFFER_SIZE)
    unsigned char       size;       // Actual buffer size
} CircularBuffer;

// Initializes the circular buffer with a given storage array and size
void init_circular_buffer(CircularBuffer* cb, unsigned int* storage, unsigned char size);

// Updates the buffer with a new value, maintaining the sliding average
void update_circular_buffer(CircularBuffer* cb, unsigned int new_value);

// Computes the average of the values currently in the buffer
unsigned int get_circular_buffer_average(CircularBuffer* cb);

#endif // _CIRCULAR_BUFFER_H_

// core.c
#include "core.h"

// Initializes the circular buffer with a given storage array and size
void init_circular_buffer(CircularBuffer* cb, unsigned int* storage, unsigned char size)
{
    unsigned char i = 0;
    
    if (cb == NULL || storage == NULL || size == 0) return;
    cb->buffer = storage;
    cb->sum = 0;
    cb->index = 0;
    cb->count = 0;
    cb->size = size;

    // Initialize buffer values to zero
    for (i = 0; i < size; i++) {
        cb->buffer[i] = 0;
    }
}

// Updates the circular buffer with a new value
void update_circular_buffer(CircularBuffer* cb, unsigned int new_value) {
    if (cb == NULL || cb->buffer == NULL) return;

    // If the buffer is full, subtract the oldest value from sum
    if (cb->count >= cb->size) {
        cb->sum -= cb->buffer[cb->index];
    }
    else {
        cb->count++;
    }

    // Add the new value to the buffer and update sum
    cb->sum += new_value;
    cb->buffer[cb->index] = new_value;

    // Update index in a circular manner
    cb->index = (cb->index + 1) % cb->size;
}

// Computes the average of the values stored in the buffer
unsigned int get_circular_buffer_average(CircularBuffer* cb) {
    if (cb == NULL || cb->count == 0) return 0;
    return cb->sum / cb->count;
}

cd D:\Library
"C:\Keil_v5\UV4\UV4.exe" -b core.uvproj -o build_log.txt