レジスタ値の設定の適用例

#include 
#include 
int main(int argc,char *argv[])
{
    int i = 0;
    if(argc != 4) {
        printf("usage : regAddr bit value");
        return -1;
    }
    for(i=0;i<4;i++){
        printf("%s ",argv[i]);
    }
    printf("
");
    unsigned int reg_addr = strtol(argv[1],NULL,16);
    unsigned int bit = strtol(argv[2],NULL,10);
    unsigned int value = strtol(argv[3],NULL,10);
    printf("register:0x%x\t",reg_addr);
    printf("bit:%d\t",bit);
    printf("value:%d
",value);
    printf("------------------
");
    if(value == 0){
        printf("clear bit
");
        reg_addr &=~(1<

プログラムコードは以上の通りで、テスト方法は以下の通りです.
(1)セット
$ gcc bit_ctrl.c -o bit_ctrl  && ./bit_ctrl 0 31 1 ./bit_ctrl 0 31 1 register:0x0    bit:31  value:1 ------------------ set bit register:0x80000000
(2)クリア$gcc bit_ctrl.c -o bit_ctrl  && ./bit_ctrl FFFFFFFF 31 0 ./bit_ctrl FFFFFFFF 31 0 register:0xffffffff     bit:31  value:0 ------------------ clear bit register:0x7fffffff