Linux系统getopt使用示例

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdint.h>

void usage()
{
    fprintf(stderr,
            "
Usage:  mcu_dload [OPTIONS] *.bin
"
            "  -a  Specify device I2C slave address(7Bit), eg: -a 5E, default is 0x58
"
            "  -d  Download binary code for MCU only
"
            "  -h  This Page.

"
    );
    exit(0);
}

uint8_t asc2hex(char asccode)
{
    uint8_t ret;
    if('0' <= asccode && asccode <= '9')
        ret = asccode - '0';
    else if('a' <= asccode && asccode <= 'f')
        ret = asccode -'a' + 10;
    else if('A' <= asccode && asccode <= 'F')
        ret = asccode - 'A' + 10;
    else ret = 0;
    return ret;
}

int main(int argc, char **argv)
{
    int opt;
    uint32_t i = 0;
    uint8_t i2c_adr = 0x58, i2c_reg;
    FILE *fp;
    
    // Parse Command Line Options
    while((opt = getopt(argc, argv, "a:h?")) != EOF) {
        switch(opt) {
            case 'a':
                i2c_adr = (asc2hex(optarg[0]) << 4) | asc2hex(optarg[1]);
                printf("I2C Device Address(7Bit) is 0x%2X.
", i2c_adr);
                break;
            case 'h':
            case '?':
            default:
                usage();
                break;
        }
    }

    // Last One is the input file
    if(optind + 1 != argc) {
        printf("Input file not found!
");
        usage();
        exit(0);
    }

    // Open *.bin file and download it to MCU
    fp = fopen(argv[optind], "r");
    if(fp == NULL) {
        printf("Input file can not open!
");
        usage();
        exit(0);
    }
    
    // Get file size
    fseek(fp, 0L, SEEK_SET);
    fseek(fp, 0L, SEEK_END);
    uint32_t binsize = ftell(fp);
    printf("Inpuf file size is %d Bytes.
", binsize);

    uint8_t *bincode = (uint8_t *)malloc(binsize);
    fseek(fp, 0L, SEEK_SET);
    fread(bincode, 1L, binsize, fp);
    fclose(fp);
    
    // Download
    printf("Reset MCU ...
");
    printf("Dowloading bin ...
");

    uint32_t dpos = binsize >> 6;
    for(i = 0; i < binsize; ++i) {
        if(i % dpos == 0) printf("#");
        usleep(5000);
        //CH341WriteI2C(0, i2c_adr, i2c_reg, bincode[i]);
        fflush(stdout);
    }
    printf("
File download succeed, %d Bytes transfered!
", binsize);

    free(bincode);
    return 0;
}