(bit)(temp & 0x80)
时间: 2023-06-20 10:03:05 浏览: 103
这是一个位运算的表达式,用于提取temp变量的最高位(第7位)的值,如果最高位为1,则表达式的值为0x80(十进制的128),否则为0。具体解释如下:
&:按位与运算符,将两个操作数的每一位进行与运算,只有当两个操作数的对应位都为1时,结果的对应位才为1,否则为0。
0x80:16进制数,二进制表示为10000000,即只有最高位为1,其余位都为0。
temp & 0x80:将temp的二进制表示与0x80进行按位与运算,结果为0或0x80(即128)。
(bit)(temp & 0x80):将上面的结果强制转换为bit类型,即0或1,表示temp的最高位是0或1。
相关问题
翻译代码 code uchar day_code1[9]={0x0,0x1f,0x3b,0x5a,0x78,0x97,0xb5,0xd4,0xf3}; code uint day_code2[3]={0x111,0x130,0x14e}; bit c_moon; bit get_moon_day(uchar month_p,uint table_addr) { uchar temp10; switch (month_p){ case 1:{temp10=year_code[table_addr]&0x08; if (temp10==0)return(0);else return(1);} case 2:{temp10=year_code[table_addr]&0x04; if (temp10==0)return(0);else return(1);} case 3:{temp10=year_code[table_addr]&0x02; if (temp10==0)return(0);else return(1);} case 4:{temp10=year_code[table_addr]&0x01; if (temp10==0)return(0);else return(1);} case 5:{temp10=year_code[table_addr+1]&0x80; if (temp10==0) return(0);else return(1);} case 6:{temp10=year_code[table_addr+1]&0x40; if (temp10==0)return(0);else return(1);} case 7:{temp10=year_code[table_addr+1]&0x20; if (temp10==0)return(0);else return(1);} case 8:{temp10=year_code[table_addr+1]&0x10; if (temp10==0)return(0);else return(1);} case 9:{temp10=year_code[table_addr+1]&0x08; if (temp10==0)return(0);else return(1);} case 10:{temp10=year_code[table_addr+1]&0x04; if (temp10==0)return(0);else return(1);} case 11:{temp10=year_code[table_addr+1]&0x02; if (temp10==0)return(0);else return(1);} case 12:{temp10=year_code[table_addr+1]&0x01; if (temp10==0)return(0);else return(1);} case 13:{temp10=year_code[table_addr+2]&0x80; if (temp10==0)return(0);else return(1);} default:return(2); } }
这是一段关于农历计算的函数代码。其中,day_code1和day_code2是两个常量数组。get_moon_day函数用于获取某个月份的月天数,需要传入两个参数,一个是月份,一个是年份对应的数组地址。函数中,首先定义了一个名为temp10的变量,用于存储月份对应的二进制数值。然后根据不同的月份,从年份对应的数组中取出相应的二进制数值,并进行位运算判断是否为0,最终返回月份的天数,如果月份不在1-13之间,则返回2。
temp+=(u8)((GPIO_ReadInputData(GPIOB)&0X0038)>>2)
& 0x00FF0000) >> 16);
This line of code reads the input data from GPIOB pins 16-23 and stores it in a temporary variable called "temp".
Here's a breakdown of what's happening:
- GPIO_ReadInputData(GPIOB): This function reads the input data from GPIOB.
- (GPIO_ReadInputData(GPIOB) & 0x00FF0000): We bitwise AND the input data with 0x00FF0000 to mask out all bits except pins 16-23 (remember that 0x00FF0000 is a hexadecimal value that represents binary 00000000111111110000000000000000).
- >> 16: We shift the masked data right by 16 bits to align it with the least significant bit.
- (u8): Finally, we cast the result to an 8-bit unsigned integer type and store it in "temp".
Overall, this line of code is useful for reading the state of specific pins on GPIOB and using that data for further processing in the program.
相关推荐
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![pdf](https://img-home.csdnimg.cn/images/20210720083512.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)