unsigned int DATA1;
unsigned char DATA2;
unsigned char *pDATA3;
struct{
unsigned int a;
unsigned char b;
unsigned int c;
unsigned short d;
}Data4;
union{
unsigned char D1;
unsigned short D2;
unsigned int D[4];
}Data5;
//32 位系统(地址 32 位),计算 sizeof 值。
sizeof(DATA1) =
sizeof(DATA2) =
sizeof(pDATA3) =
sizeof(Data4) =
sizeof(Data5) =
定义入口参数为 unsigned int,返回类型 unsigned int 的函数指针。
unsigned int (*func_ptr)(unsigned int);
其中,func_ptr 是一个函数指针,它指向一个入口参数为 unsigned int,返回类型为 unsigned int 的函数。可以通过以下方式来使用该函数指针:
unsigned int my_func(unsigned int x) {
return x * 2;
}
int main() {
unsigned int (*func_ptr)(unsigned int) = &my_func;
unsigned int result = (*func_ptr)(10); // 调用 my_func 函数,传入参数 10
return 0;
}
在上面的示例中,定义了一个名为 my_func 的函数,它接收一个 unsigned int 类型的参数,并返回参数的两倍。然后,在 main 函数中,定义了一个函数指针 func_ptr,并将其初始化为 my_func 的地址。最后,通过 (*func_ptr)(10) 的方式调用 my_func 函数,传入参数 10,并将返回值赋给变量 result。
需要注意的是,函数指针的语法比较复杂,需要仔细理解。在使用函数指针时,需要注意函数指针的类型和函数的参数类型、返回类型要匹配。
在多任务系统中,当多个任务共享同一硬件时,请描述出所有可能的防止冲突的方案。
分别列举出 C 语言程序编译时,有可能出现的编译及链接错误。
C 语言的头文件是由编译器还是链接器处理?是如何处理“#include <xxx.h>”语句的?
1、画出一个放大倍数为 2 倍的同相运放与反相运放放大电路。
4-Switch Single Inductor Architecture Allows VIN Above, Below or Equal to VOUT
Synchronous Switching: Up to 98.5% Efficiency
Wide VIN Range: 4.7V to 60V
2% Output Voltage Accuracy: 1.2V ≤ VOUT < 60V
6% Output Current Accuracy: 0V ≤ VOUT < 60V
Input and Output Current Regulation with Current Monitor Outputs
No Top FET Refresh in Buck or Boost
VOUT Disconnected from VIN During Shutdown
C/10 Charge Termination and Output Shorted Flags
Capable of 100W or Greater per IC
Easy Parallel Capability to Extend Output Power
38-Lead TSSOP with Exposed Pad
The LT 90 is a synchronous 4-switch buck-boost volt- age/current regulator controller. The LT90 can regulate output voltage, output current, or input current with input voltages above, below, or equal to the output voltage. The constant-frequency, current mode architecture allows its frequency to be adjusted or synchronized from 200kHz to 700kHz. No top FET refresh switching cycle is needed in buck or boost operation. With 60V input, 60V output capability and seamless transitions between operating regions, the LT90 is ideal for voltage regulator, bat- tery/super-capacitor charger applications in automotive, industrial, telecom, and even battery- powered systems.
The LT90 provides input current monitor, output current monitor, and various status flags, such as C/10 charge termination and shorted output flag.
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