求助电磁场与电磁波好考么

谢邀，没有

电信学院的巨简单。因为这门课太抽象了，考的都是基础知识，背背就能过

应该没有，当时60擦边过

没有

我要考电磁学

做做那个黄皮书的题目吧 有很多题目参照那个来的

void TIM2_Delay500MS ()
-
TIM_ TimeBaseInitTypeDef TIM_ TimeBaseStructure;
/ * Enable TIM2 clock * /
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
/ *
TIM2 Time Base Configuration:
TIM2CLK / ((TIM _Prescaler+1) * (TIM Period+ 1)) =TIM2 FrequenCy TIM2CLK-72MEz, TIM2 Frequency= ZHZ,
TIMPTeSCaICI=36000-1，(IIM2 counter c1ock=2k5z)，TIM Per109=1009-上*4
TIM 网页链接 Prescaler=36000-1;
TIM_TimeBasestructure.TIM_Period-1000--/ TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;
TIM_ TimeBaseInit (TIM2, STIM_TimeBaseStructure);
/ * Clear TIM2 update pending flag * / TIM ClearFlag (TIM2, TIM_ FLAG_Update);
* Enable TIMZ counter * /
TIM_ CmG (IIM2, ENABLE);
while (TIM_GetFlagStatus (TIM2, TIM_FLAG _Update) =-RESET) ;

void usart_Configuration(void)
{
USART_InitTypeDef USART_InitStruct;
Rcc_Configuration();
USART_InitStruct.USART_BaudRate = 115200;
USART_InitStruct.USART_StopBits = USART_StopBits_1;
USART_InitStruct.USART_WordLength = USART_WordLength_8b;
USART_InitStruct.USART_Parity = USART_Parity_No;
USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStruct.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;
USART_Init(USART1, &USART_InitStruct);
USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);
USART_Cmd(USART1, ENABLE);
UsartGPIO_Configuration();
}

#include "stm32f10x.h"
int main(void)
{
// 配置 GPIOA 引脚为上拉输入模式
RCC->APB2ENR |= RCC_APB2ENR_IOPAEN;
GPIOA->CRL &= ~(GPIO_CRL_MODE0 | GPIO_CRL_CNF0); // 清除原来的配置
GPIOA->CRL |= GPIO_CRL_CNF0_1; // 输入模式，上拉
GPIOA->ODR |= GPIO_ODR_ODR0; // 上拉输入
while (1)
{
// 读取 GPIOA0 的电平
if ((GPIOA->IDR & GPIO_IDR_IDR0) != 0)
{
// GPIOA0 为高电平
// 在此处编写相应的处理代码
}
else
{
// GPIOA0 为低电平
// 在此处编写相应的处理代码
}
}
}